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samd21, samd51: move USB-CDC code

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Этот коммит содержится в:
sago35 2022-07-05 20:39:47 +09:00 • коммит произвёл Ron Evans
родитель 24b1bfcecd
коммит 401bd89664
4 изменённых файлов: 1705 добавлений и 1675 удалений
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921
src/machine/machine_atsamd21.go
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@ -13,7 +13,6 @@ import (
"device/sam"
"errors"
"runtime/interrupt"
"runtime/volatile"
"unsafe"
)
@ -1735,926 +1734,6 @@ func (tcc *TCC) Set(channel uint8, value uint32) {
}
}
// USBCDC is the USB CDC aka serial over USB interface on the SAMD21.
type USBCDC struct {
Buffer *RingBuffer
TxIdx volatile.Register8
waitTxc bool
waitTxcRetryCount uint8
sent bool
configured bool
}
var (
USB = &USBCDC{Buffer: NewRingBuffer()}
waitHidTxc bool
)
const (
usbcdcTxSizeMask uint8 = 0x3F
usbcdcTxBankMask uint8 = ^usbcdcTxSizeMask
usbcdcTxBank1st uint8 = 0x00
usbcdcTxBank2nd uint8 = usbcdcTxSizeMask + 1
usbcdcTxMaxRetriesAllowed uint8 = 5
)
// Flush flushes buffered data.
func (usbcdc *USBCDC) Flush() error {
if usbLineInfo.lineState > 0 {
idx := usbcdc.TxIdx.Get()
sz := idx & usbcdcTxSizeMask
bk := idx & usbcdcTxBankMask
if 0 < sz {
if usbcdc.waitTxc {
// waiting for the next flush(), because the transmission is not complete
usbcdc.waitTxcRetryCount++
return nil
}
usbcdc.waitTxc = true
usbcdc.waitTxcRetryCount = 0
// set the data
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][bk]))))
if bk == usbcdcTxBank1st {
usbcdc.TxIdx.Set(usbcdcTxBank2nd)
} else {
usbcdc.TxIdx.Set(usbcdcTxBank1st)
}
// clean multi packet size of bytes already sent
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set count of bytes to be sent
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.SetBits((uint32(sz) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// clear transfer complete flag
setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
// send data by setting bank ready
setEPSTATUSSET(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
usbcdc.sent = true
}
}
return nil
}
// WriteByte writes a byte of data to the USB CDC interface.
func (usbcdc *USBCDC) WriteByte(c byte) error {
// Supposedly to handle problem with Windows USB serial ports?
if usbLineInfo.lineState > 0 {
ok := false
for {
mask := interrupt.Disable()
idx := usbcdc.TxIdx.Get()
if (idx & usbcdcTxSizeMask) < usbcdcTxSizeMask {
udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][idx] = c
usbcdc.TxIdx.Set(idx + 1)
ok = true
}
interrupt.Restore(mask)
if ok {
break
} else if usbcdcTxMaxRetriesAllowed < usbcdc.waitTxcRetryCount {
mask := interrupt.Disable()
usbcdc.waitTxc = false
usbcdc.waitTxcRetryCount = 0
usbcdc.TxIdx.Set(0)
usbLineInfo.lineState = 0
interrupt.Restore(mask)
break
} else {
mask := interrupt.Disable()
if usbcdc.sent {
if usbcdc.waitTxc {
if (getEPINTFLAG(usb_CDC_ENDPOINT_IN) & sam.USB_DEVICE_EPINTFLAG_TRCPT1) != 0 {
setEPSTATUSCLR(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPSTATUSCLR_BK1RDY)
setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
usbcdc.waitTxc = false
usbcdc.Flush()
}
} else {
usbcdc.Flush()
}
}
interrupt.Restore(mask)
}
}
}
return nil
}
func (usbcdc *USBCDC) DTR() bool {
return (usbLineInfo.lineState & usb_CDC_LINESTATE_DTR) > 0
}
func (usbcdc *USBCDC) RTS() bool {
return (usbLineInfo.lineState & usb_CDC_LINESTATE_RTS) > 0
}
const (
// these are SAMD21 specific.
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos = 0
usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask = 0x3FFF
usb_DEVICE_PCKSIZE_SIZE_Pos = 28
usb_DEVICE_PCKSIZE_SIZE_Mask = 0x7
usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos = 14
usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask = 0x3FFF
)
var (
usbEndpointDescriptors [8]usbDeviceDescriptor
udd_ep_in_cache_buffer [7][128]uint8
udd_ep_out_cache_buffer [7][128]uint8
isEndpointHalt = false
isRemoteWakeUpEnabled = false
endPoints = []uint32{usb_ENDPOINT_TYPE_CONTROL,
(usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn),
(usb_ENDPOINT_TYPE_BULK | usbEndpointOut),
(usb_ENDPOINT_TYPE_BULK | usbEndpointIn)}
usbConfiguration uint8
usbSetInterface uint8
usbLineInfo = cdcLineInfo{115200, 0x00, 0x00, 0x08, 0x00}
)
// Configure the USB CDC interface. The config is here for compatibility with the UART interface.
func (usbcdc *USBCDC) Configure(config UARTConfig) {
// reset USB interface
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_SWRST)
for sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_SWRST) ||
sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_ENABLE) {
}
sam.USB_DEVICE.DESCADD.Set(uint32(uintptr(unsafe.Pointer(&usbEndpointDescriptors))))
// configure pins
USBCDC_DM_PIN.Configure(PinConfig{Mode: PinCom})
USBCDC_DP_PIN.Configure(PinConfig{Mode: PinCom})
// performs pad calibration from store fuses
handlePadCalibration()
// run in standby
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_RUNSTDBY)
// set full speed
sam.USB_DEVICE.CTRLB.SetBits(sam.USB_DEVICE_CTRLB_SPDCONF_FS << sam.USB_DEVICE_CTRLB_SPDCONF_Pos)
// attach
sam.USB_DEVICE.CTRLB.ClearBits(sam.USB_DEVICE_CTRLB_DETACH)
// enable interrupt for end of reset
sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_EORST)
// enable interrupt for start of frame
sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_SOF)
// enable USB
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_ENABLE)
// enable IRQ
intr := interrupt.New(sam.IRQ_USB, handleUSB)
intr.Enable()
usbcdc.configured = true
}
// Configured returns whether usbcdc is configured or not.
func (usbcdc *USBCDC) Configured() bool {
return usbcdc.configured
}
func handlePadCalibration() {
// Load Pad Calibration data from non-volatile memory
// This requires registers that are not included in the SVD file.
// Modeled after defines from samd21g18a.h and nvmctrl.h:
//
// #define NVMCTRL_OTP4 0x00806020
//
// #define USB_FUSES_TRANSN_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRANSN_Pos 13 /**< \brief (NVMCTRL_OTP4) USB pad Transn calibration */
// #define USB_FUSES_TRANSN_Msk (0x1Fu << USB_FUSES_TRANSN_Pos)
// #define USB_FUSES_TRANSN(value) ((USB_FUSES_TRANSN_Msk & ((value) << USB_FUSES_TRANSN_Pos)))
// #define USB_FUSES_TRANSP_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRANSP_Pos 18 /**< \brief (NVMCTRL_OTP4) USB pad Transp calibration */
// #define USB_FUSES_TRANSP_Msk (0x1Fu << USB_FUSES_TRANSP_Pos)
// #define USB_FUSES_TRANSP(value) ((USB_FUSES_TRANSP_Msk & ((value) << USB_FUSES_TRANSP_Pos)))
// #define USB_FUSES_TRIM_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRIM_Pos 23 /**< \brief (NVMCTRL_OTP4) USB pad Trim calibration */
// #define USB_FUSES_TRIM_Msk (0x7u << USB_FUSES_TRIM_Pos)
// #define USB_FUSES_TRIM(value) ((USB_FUSES_TRIM_Msk & ((value) << USB_FUSES_TRIM_Pos)))
//
fuse := *(*uint32)(unsafe.Pointer(uintptr(0x00806020) + 4))
calibTransN := uint16(fuse>>13) & uint16(0x1f)
calibTransP := uint16(fuse>>18) & uint16(0x1f)
calibTrim := uint16(fuse>>23) & uint16(0x7)
if calibTransN == 0x1f {
calibTransN = 5
}
sam.USB_DEVICE.PADCAL.SetBits(calibTransN << sam.USB_DEVICE_PADCAL_TRANSN_Pos)
if calibTransP == 0x1f {
calibTransP = 29
}
sam.USB_DEVICE.PADCAL.SetBits(calibTransP << sam.USB_DEVICE_PADCAL_TRANSP_Pos)
if calibTrim == 0x7 {
calibTrim = 3
}
sam.USB_DEVICE.PADCAL.SetBits(calibTrim << sam.USB_DEVICE_PADCAL_TRIM_Pos)
}
func handleUSB(intr interrupt.Interrupt) {
// reset all interrupt flags
flags := sam.USB_DEVICE.INTFLAG.Get()
sam.USB_DEVICE.INTFLAG.Set(flags)
// End of reset
if (flags & sam.USB_DEVICE_INTFLAG_EORST) > 0 {
// Configure control endpoint
initEndpoint(0, usb_ENDPOINT_TYPE_CONTROL)
// Enable Setup-Received interrupt
setEPINTENSET(0, sam.USB_DEVICE_EPINTENSET_RXSTP)
usbConfiguration = 0
// ack the End-Of-Reset interrupt
sam.USB_DEVICE.INTFLAG.Set(sam.USB_DEVICE_INTFLAG_EORST)
}
// Start of frame
if (flags & sam.USB_DEVICE_INTFLAG_SOF) > 0 {
USB.Flush()
// if you want to blink LED showing traffic, this would be the place...
if hidCallback != nil && !waitHidTxc {
hidCallback()
}
}
// Endpoint 0 Setup interrupt
if getEPINTFLAG(0)&sam.USB_DEVICE_EPINTFLAG_RXSTP > 0 {
// ack setup received
setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_RXSTP)
// parse setup
setup := newUSBSetup(udd_ep_out_cache_buffer[0][:])
// Clear the Bank 0 ready flag on Control OUT
setEPSTATUSCLR(0, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
ok := false
if (setup.bmRequestType & usb_REQUEST_TYPE) == usb_REQUEST_STANDARD {
// Standard Requests
ok = handleStandardSetup(setup)
} else {
// Class Interface Requests
if setup.wIndex == usb_CDC_ACM_INTERFACE {
ok = cdcSetup(setup)
} else if setup.bmRequestType == usb_SET_REPORT_TYPE && setup.bRequest == usb_SET_IDLE {
sendZlp()
ok = true
}
}
if ok {
// set Bank1 ready
setEPSTATUSSET(0, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
} else {
// Stall endpoint
setEPSTATUSSET(0, sam.USB_DEVICE_EPINTFLAG_STALL1)
}
if getEPINTFLAG(0)&sam.USB_DEVICE_EPINTFLAG_STALL1 > 0 {
// ack the stall
setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_STALL1)
// clear stall request
setEPINTENCLR(0, sam.USB_DEVICE_EPINTENCLR_STALL1)
}
}
// Now the actual transfer handlers, ignore endpoint number 0 (setup)
var i uint32
for i = 1; i < uint32(len(endPoints)); i++ {
// Check if endpoint has a pending interrupt
epFlags := getEPINTFLAG(i)
if (epFlags&sam.USB_DEVICE_EPINTFLAG_TRCPT0) > 0 ||
(epFlags&sam.USB_DEVICE_EPINTFLAG_TRCPT1) > 0 {
switch i {
case usb_CDC_ENDPOINT_OUT:
handleEndpoint(i)
setEPINTFLAG(i, epFlags)
case usb_CDC_ENDPOINT_IN, usb_CDC_ENDPOINT_ACM:
setEPSTATUSCLR(i, sam.USB_DEVICE_EPSTATUSCLR_BK1RDY)
setEPINTFLAG(i, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
if i == usb_CDC_ENDPOINT_IN {
USB.waitTxc = false
}
case usb_HID_ENDPOINT_IN:
setEPINTFLAG(i, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
waitHidTxc = false
}
}
}
}
func initEndpoint(ep, config uint32) {
switch config {
case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_INTERRUPT + 1) << sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
case usb_ENDPOINT_TYPE_BULK | usbEndpointOut:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_EPCFG_EPTYPE0_Pos))
// receive interrupts when current transfer complete
setEPINTENSET(ep, sam.USB_DEVICE_EPINTENSET_TRCPT0)
// set byte count to zero, we have not received anything yet
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// ready for next transfer
setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointOut:
// TODO: not really anything, seems like...
case usb_ENDPOINT_TYPE_BULK | usbEndpointIn:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
// NAK on endpoint IN, the bank is not yet filled in.
setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK1RDY)
case usb_ENDPOINT_TYPE_CONTROL:
// Control OUT
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_EPCFG_EPTYPE0_Pos))
// Control IN
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
// Prepare OUT endpoint for receive
// set multi packet size for expected number of receive bytes on control OUT
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set byte count to zero, we have not received anything yet
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// NAK on endpoint OUT to show we are ready to receive control data
setEPSTATUSSET(ep, sam.USB_DEVICE_EPSTATUSSET_BK0RDY)
}
}
func handleStandardSetup(setup usbSetup) bool {
switch setup.bRequest {
case usb_GET_STATUS:
buf := []byte{0, 0}
if setup.bmRequestType != 0 { // endpoint
// TODO: actually check if the endpoint in question is currently halted
if isEndpointHalt {
buf[0] = 1
}
}
sendUSBPacket(0, buf, setup.wLength)
return true
case usb_CLEAR_FEATURE:
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
isRemoteWakeUpEnabled = false
} else if setup.wValueL == 0 { // ENDPOINTHALT
isEndpointHalt = false
}
sendZlp()
return true
case usb_SET_FEATURE:
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
isRemoteWakeUpEnabled = true
} else if setup.wValueL == 0 { // ENDPOINTHALT
isEndpointHalt = true
}
sendZlp()
return true
case usb_SET_ADDRESS:
// set packet size 64 with auto Zlp after transfer
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE.Set((epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos) |
uint32(1<<31)) // autozlp
// ack the transfer is complete from the request
setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
// set bank ready for data
setEPSTATUSSET(0, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
// wait for transfer to complete
timeout := 3000
for (getEPINTFLAG(0) & sam.USB_DEVICE_EPINTFLAG_TRCPT1) == 0 {
timeout--
if timeout == 0 {
return true
}
}
// last, set the device address to that requested by host
sam.USB_DEVICE.DADD.SetBits(setup.wValueL)
sam.USB_DEVICE.DADD.SetBits(sam.USB_DEVICE_DADD_ADDEN)
return true
case usb_GET_DESCRIPTOR:
sendDescriptor(setup)
return true
case usb_SET_DESCRIPTOR:
return false
case usb_GET_CONFIGURATION:
buff := []byte{usbConfiguration}
sendUSBPacket(0, buff, setup.wLength)
return true
case usb_SET_CONFIGURATION:
if setup.bmRequestType&usb_REQUEST_RECIPIENT == usb_REQUEST_DEVICE {
for i := 1; i < len(endPoints); i++ {
initEndpoint(uint32(i), endPoints[i])
}
usbConfiguration = setup.wValueL
// Enable interrupt for CDC control messages from host (OUT packet)
setEPINTENSET(usb_CDC_ENDPOINT_ACM, sam.USB_DEVICE_EPINTENSET_TRCPT1)
// Enable interrupt for CDC data messages from host
setEPINTENSET(usb_CDC_ENDPOINT_OUT, sam.USB_DEVICE_EPINTENSET_TRCPT0)
// Enable interrupt for HID messages from host
if hidCallback != nil {
setEPINTENSET(usb_HID_ENDPOINT_IN, sam.USB_DEVICE_EPINTENSET_TRCPT1)
}
sendZlp()
return true
} else {
return false
}
case usb_GET_INTERFACE:
buff := []byte{usbSetInterface}
sendUSBPacket(0, buff, setup.wLength)
return true
case usb_SET_INTERFACE:
usbSetInterface = setup.wValueL
sendZlp()
return true
default:
return true
}
}
func cdcSetup(setup usbSetup) bool {
if setup.bmRequestType == usb_REQUEST_DEVICETOHOST_CLASS_INTERFACE {
if setup.bRequest == usb_CDC_GET_LINE_CODING {
var b [cdcLineInfoSize]byte
b[0] = byte(usbLineInfo.dwDTERate)
b[1] = byte(usbLineInfo.dwDTERate >> 8)
b[2] = byte(usbLineInfo.dwDTERate >> 16)
b[3] = byte(usbLineInfo.dwDTERate >> 24)
b[4] = byte(usbLineInfo.bCharFormat)
b[5] = byte(usbLineInfo.bParityType)
b[6] = byte(usbLineInfo.bDataBits)
sendUSBPacket(0, b[:], setup.wLength)
return true
}
}
if setup.bmRequestType == usb_REQUEST_HOSTTODEVICE_CLASS_INTERFACE {
if setup.bRequest == usb_CDC_SET_LINE_CODING {
b, err := receiveUSBControlPacket()
if err != nil {
return false
}
usbLineInfo.dwDTERate = uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
usbLineInfo.bCharFormat = b[4]
usbLineInfo.bParityType = b[5]
usbLineInfo.bDataBits = b[6]
}
if setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
usbLineInfo.lineState = setup.wValueL
}
if setup.bRequest == usb_CDC_SET_LINE_CODING || setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
// auto-reset into the bootloader
if usbLineInfo.dwDTERate == 1200 && usbLineInfo.lineState&usb_CDC_LINESTATE_DTR == 0 {
ResetProcessor()
} else {
// TODO: cancel any reset
}
sendZlp()
}
if setup.bRequest == usb_CDC_SEND_BREAK {
// TODO: something with this value?
// breakValue = ((uint16_t)setup.wValueH << 8) | setup.wValueL;
// return false;
sendZlp()
}
return true
}
return false
}
// SendUSBHIDPacket sends a packet for USBHID (interrupt / in).
func SendUSBHIDPacket(ep uint32, data []byte) bool {
if waitHidTxc {
return false
}
sendUSBPacket(ep, data, 0)
// clear transfer complete flag
setEPINTFLAG(ep, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
// send data by setting bank ready
setEPSTATUSSET(ep, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
waitHidTxc = true
return true
}
//go:noinline
func sendUSBPacket(ep uint32, data []byte, maxsize uint16) {
l := uint16(len(data))
if 0 < maxsize && maxsize < l {
l = maxsize
}
copy(udd_ep_in_cache_buffer[ep][:], data[:l])
// Set endpoint address for sending data
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// clear multi-packet size which is total bytes already sent
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set byte count, which is total number of bytes to be sent
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits((uint32(l) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
}
func receiveUSBControlPacket() ([cdcLineInfoSize]byte, error) {
var b [cdcLineInfoSize]byte
// address
usbEndpointDescriptors[0].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[0]))))
// set byte count to zero
usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// set ready for next data
setEPSTATUSCLR(0, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
// Wait until OUT transfer is ready.
timeout := 300000
for (getEPSTATUS(0) & sam.USB_DEVICE_EPSTATUS_BK0RDY) == 0 {
timeout--
if timeout == 0 {
return b, errUSBCDCReadTimeout
}
}
// Wait until OUT transfer is completed.
timeout = 300000
for (getEPINTFLAG(0) & sam.USB_DEVICE_EPINTFLAG_TRCPT0) == 0 {
timeout--
if timeout == 0 {
return b, errUSBCDCReadTimeout
}
}
// get data
bytesread := uint32((usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.Get() >>
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
if bytesread != cdcLineInfoSize {
return b, errUSBCDCBytesRead
}
copy(b[:7], udd_ep_out_cache_buffer[0][:7])
return b, nil
}
func handleEndpoint(ep uint32) {
// get data
count := int((usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.Get() >>
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
// move to ring buffer
for i := 0; i < count; i++ {
USB.Receive(byte((udd_ep_out_cache_buffer[ep][i] & 0xFF)))
}
// set byte count to zero
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// set multi packet size to 64
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set ready for next data
setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
}
func sendZlp() {
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
}
func epPacketSize(size uint16) uint32 {
switch size {
case 8:
return 0
case 16:
return 1
case 32:
return 2
case 64:
return 3
case 128:
return 4
case 256:
return 5
case 512:
return 6
case 1023:
return 7
default:
return 0
}
}
func getEPCFG(ep uint32) uint8 {
switch ep {
case 0:
return sam.USB_DEVICE.EPCFG0.Get()
case 1:
return sam.USB_DEVICE.EPCFG1.Get()
case 2:
return sam.USB_DEVICE.EPCFG2.Get()
case 3:
return sam.USB_DEVICE.EPCFG3.Get()
case 4:
return sam.USB_DEVICE.EPCFG4.Get()
case 5:
return sam.USB_DEVICE.EPCFG5.Get()
case 6:
return sam.USB_DEVICE.EPCFG6.Get()
case 7:
return sam.USB_DEVICE.EPCFG7.Get()
default:
return 0
}
}
func setEPCFG(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPCFG0.Set(val)
case 1:
sam.USB_DEVICE.EPCFG1.Set(val)
case 2:
sam.USB_DEVICE.EPCFG2.Set(val)
case 3:
sam.USB_DEVICE.EPCFG3.Set(val)
case 4:
sam.USB_DEVICE.EPCFG4.Set(val)
case 5:
sam.USB_DEVICE.EPCFG5.Set(val)
case 6:
sam.USB_DEVICE.EPCFG6.Set(val)
case 7:
sam.USB_DEVICE.EPCFG7.Set(val)
default:
return
}
}
func setEPSTATUSCLR(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPSTATUSCLR0.Set(val)
case 1:
sam.USB_DEVICE.EPSTATUSCLR1.Set(val)
case 2:
sam.USB_DEVICE.EPSTATUSCLR2.Set(val)
case 3:
sam.USB_DEVICE.EPSTATUSCLR3.Set(val)
case 4:
sam.USB_DEVICE.EPSTATUSCLR4.Set(val)
case 5:
sam.USB_DEVICE.EPSTATUSCLR5.Set(val)
case 6:
sam.USB_DEVICE.EPSTATUSCLR6.Set(val)
case 7:
sam.USB_DEVICE.EPSTATUSCLR7.Set(val)
default:
return
}
}
func setEPSTATUSSET(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPSTATUSSET0.Set(val)
case 1:
sam.USB_DEVICE.EPSTATUSSET1.Set(val)
case 2:
sam.USB_DEVICE.EPSTATUSSET2.Set(val)
case 3:
sam.USB_DEVICE.EPSTATUSSET3.Set(val)
case 4:
sam.USB_DEVICE.EPSTATUSSET4.Set(val)
case 5:
sam.USB_DEVICE.EPSTATUSSET5.Set(val)
case 6:
sam.USB_DEVICE.EPSTATUSSET6.Set(val)
case 7:
sam.USB_DEVICE.EPSTATUSSET7.Set(val)
default:
return
}
}
func getEPSTATUS(ep uint32) uint8 {
switch ep {
case 0:
return sam.USB_DEVICE.EPSTATUS0.Get()
case 1:
return sam.USB_DEVICE.EPSTATUS1.Get()
case 2:
return sam.USB_DEVICE.EPSTATUS2.Get()
case 3:
return sam.USB_DEVICE.EPSTATUS3.Get()
case 4:
return sam.USB_DEVICE.EPSTATUS4.Get()
case 5:
return sam.USB_DEVICE.EPSTATUS5.Get()
case 6:
return sam.USB_DEVICE.EPSTATUS6.Get()
case 7:
return sam.USB_DEVICE.EPSTATUS7.Get()
default:
return 0
}
}
func getEPINTFLAG(ep uint32) uint8 {
switch ep {
case 0:
return sam.USB_DEVICE.EPINTFLAG0.Get()
case 1:
return sam.USB_DEVICE.EPINTFLAG1.Get()
case 2:
return sam.USB_DEVICE.EPINTFLAG2.Get()
case 3:
return sam.USB_DEVICE.EPINTFLAG3.Get()
case 4:
return sam.USB_DEVICE.EPINTFLAG4.Get()
case 5:
return sam.USB_DEVICE.EPINTFLAG5.Get()
case 6:
return sam.USB_DEVICE.EPINTFLAG6.Get()
case 7:
return sam.USB_DEVICE.EPINTFLAG7.Get()
default:
return 0
}
}
func setEPINTFLAG(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPINTFLAG0.Set(val)
case 1:
sam.USB_DEVICE.EPINTFLAG1.Set(val)
case 2:
sam.USB_DEVICE.EPINTFLAG2.Set(val)
case 3:
sam.USB_DEVICE.EPINTFLAG3.Set(val)
case 4:
sam.USB_DEVICE.EPINTFLAG4.Set(val)
case 5:
sam.USB_DEVICE.EPINTFLAG5.Set(val)
case 6:
sam.USB_DEVICE.EPINTFLAG6.Set(val)
case 7:
sam.USB_DEVICE.EPINTFLAG7.Set(val)
default:
return
}
}
func setEPINTENCLR(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPINTENCLR0.Set(val)
case 1:
sam.USB_DEVICE.EPINTENCLR1.Set(val)
case 2:
sam.USB_DEVICE.EPINTENCLR2.Set(val)
case 3:
sam.USB_DEVICE.EPINTENCLR3.Set(val)
case 4:
sam.USB_DEVICE.EPINTENCLR4.Set(val)
case 5:
sam.USB_DEVICE.EPINTENCLR5.Set(val)
case 6:
sam.USB_DEVICE.EPINTENCLR6.Set(val)
case 7:
sam.USB_DEVICE.EPINTENCLR7.Set(val)
default:
return
}
}
func setEPINTENSET(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPINTENSET0.Set(val)
case 1:
sam.USB_DEVICE.EPINTENSET1.Set(val)
case 2:
sam.USB_DEVICE.EPINTENSET2.Set(val)
case 3:
sam.USB_DEVICE.EPINTENSET3.Set(val)
case 4:
sam.USB_DEVICE.EPINTENSET4.Set(val)
case 5:
sam.USB_DEVICE.EPINTENSET5.Set(val)
case 6:
sam.USB_DEVICE.EPINTENSET6.Set(val)
case 7:
sam.USB_DEVICE.EPINTENSET7.Set(val)
default:
return
}
}
// ResetProcessor should perform a system reset in preperation
// to switch to the bootloader to flash new firmware.
func ResetProcessor() {

936
src/machine/machine_atsamd21_usb.go Обычный файл
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@ -0,0 +1,936 @@
//go:build sam && atsamd21
// +build sam,atsamd21
// Peripheral abstraction layer for the atsamd21.
//
// Datasheet:
// http://ww1.microchip.com/downloads/en/DeviceDoc/SAMD21-Family-DataSheet-DS40001882D.pdf
//
package machine
import (
"device/sam"
"runtime/interrupt"
"runtime/volatile"
"unsafe"
)
// USBCDC is the USB CDC aka serial over USB interface on the SAMD21.
type USBCDC struct {
Buffer *RingBuffer
TxIdx volatile.Register8
waitTxc bool
waitTxcRetryCount uint8
sent bool
configured bool
}
var (
USB = &USBCDC{Buffer: NewRingBuffer()}
waitHidTxc bool
)
const (
usbcdcTxSizeMask uint8 = 0x3F
usbcdcTxBankMask uint8 = ^usbcdcTxSizeMask
usbcdcTxBank1st uint8 = 0x00
usbcdcTxBank2nd uint8 = usbcdcTxSizeMask + 1
usbcdcTxMaxRetriesAllowed uint8 = 5
)
// Flush flushes buffered data.
func (usbcdc *USBCDC) Flush() error {
if usbLineInfo.lineState > 0 {
idx := usbcdc.TxIdx.Get()
sz := idx & usbcdcTxSizeMask
bk := idx & usbcdcTxBankMask
if 0 < sz {
if usbcdc.waitTxc {
// waiting for the next flush(), because the transmission is not complete
usbcdc.waitTxcRetryCount++
return nil
}
usbcdc.waitTxc = true
usbcdc.waitTxcRetryCount = 0
// set the data
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][bk]))))
if bk == usbcdcTxBank1st {
usbcdc.TxIdx.Set(usbcdcTxBank2nd)
} else {
usbcdc.TxIdx.Set(usbcdcTxBank1st)
}
// clean multi packet size of bytes already sent
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set count of bytes to be sent
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.SetBits((uint32(sz) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// clear transfer complete flag
setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
// send data by setting bank ready
setEPSTATUSSET(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
usbcdc.sent = true
}
}
return nil
}
// WriteByte writes a byte of data to the USB CDC interface.
func (usbcdc *USBCDC) WriteByte(c byte) error {
// Supposedly to handle problem with Windows USB serial ports?
if usbLineInfo.lineState > 0 {
ok := false
for {
mask := interrupt.Disable()
idx := usbcdc.TxIdx.Get()
if (idx & usbcdcTxSizeMask) < usbcdcTxSizeMask {
udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][idx] = c
usbcdc.TxIdx.Set(idx + 1)
ok = true
}
interrupt.Restore(mask)
if ok {
break
} else if usbcdcTxMaxRetriesAllowed < usbcdc.waitTxcRetryCount {
mask := interrupt.Disable()
usbcdc.waitTxc = false
usbcdc.waitTxcRetryCount = 0
usbcdc.TxIdx.Set(0)
usbLineInfo.lineState = 0
interrupt.Restore(mask)
break
} else {
mask := interrupt.Disable()
if usbcdc.sent {
if usbcdc.waitTxc {
if (getEPINTFLAG(usb_CDC_ENDPOINT_IN) & sam.USB_DEVICE_EPINTFLAG_TRCPT1) != 0 {
setEPSTATUSCLR(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPSTATUSCLR_BK1RDY)
setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
usbcdc.waitTxc = false
usbcdc.Flush()
}
} else {
usbcdc.Flush()
}
}
interrupt.Restore(mask)
}
}
}
return nil
}
func (usbcdc *USBCDC) DTR() bool {
return (usbLineInfo.lineState & usb_CDC_LINESTATE_DTR) > 0
}
func (usbcdc *USBCDC) RTS() bool {
return (usbLineInfo.lineState & usb_CDC_LINESTATE_RTS) > 0
}
const (
// these are SAMD21 specific.
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos = 0
usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask = 0x3FFF
usb_DEVICE_PCKSIZE_SIZE_Pos = 28
usb_DEVICE_PCKSIZE_SIZE_Mask = 0x7
usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos = 14
usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask = 0x3FFF
)
var (
usbEndpointDescriptors [8]usbDeviceDescriptor
udd_ep_in_cache_buffer [7][128]uint8
udd_ep_out_cache_buffer [7][128]uint8
isEndpointHalt = false
isRemoteWakeUpEnabled = false
endPoints = []uint32{usb_ENDPOINT_TYPE_CONTROL,
(usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn),
(usb_ENDPOINT_TYPE_BULK | usbEndpointOut),
(usb_ENDPOINT_TYPE_BULK | usbEndpointIn)}
usbConfiguration uint8
usbSetInterface uint8
usbLineInfo = cdcLineInfo{115200, 0x00, 0x00, 0x08, 0x00}
)
// Configure the USB CDC interface. The config is here for compatibility with the UART interface.
func (usbcdc *USBCDC) Configure(config UARTConfig) {
// reset USB interface
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_SWRST)
for sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_SWRST) ||
sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_ENABLE) {
}
sam.USB_DEVICE.DESCADD.Set(uint32(uintptr(unsafe.Pointer(&usbEndpointDescriptors))))
// configure pins
USBCDC_DM_PIN.Configure(PinConfig{Mode: PinCom})
USBCDC_DP_PIN.Configure(PinConfig{Mode: PinCom})
// performs pad calibration from store fuses
handlePadCalibration()
// run in standby
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_RUNSTDBY)
// set full speed
sam.USB_DEVICE.CTRLB.SetBits(sam.USB_DEVICE_CTRLB_SPDCONF_FS << sam.USB_DEVICE_CTRLB_SPDCONF_Pos)
// attach
sam.USB_DEVICE.CTRLB.ClearBits(sam.USB_DEVICE_CTRLB_DETACH)
// enable interrupt for end of reset
sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_EORST)
// enable interrupt for start of frame
sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_SOF)
// enable USB
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_ENABLE)
// enable IRQ
intr := interrupt.New(sam.IRQ_USB, handleUSB)
intr.Enable()
usbcdc.configured = true
}
// Configured returns whether usbcdc is configured or not.
func (usbcdc *USBCDC) Configured() bool {
return usbcdc.configured
}
func handlePadCalibration() {
// Load Pad Calibration data from non-volatile memory
// This requires registers that are not included in the SVD file.
// Modeled after defines from samd21g18a.h and nvmctrl.h:
//
// #define NVMCTRL_OTP4 0x00806020
//
// #define USB_FUSES_TRANSN_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRANSN_Pos 13 /**< \brief (NVMCTRL_OTP4) USB pad Transn calibration */
// #define USB_FUSES_TRANSN_Msk (0x1Fu << USB_FUSES_TRANSN_Pos)
// #define USB_FUSES_TRANSN(value) ((USB_FUSES_TRANSN_Msk & ((value) << USB_FUSES_TRANSN_Pos)))
// #define USB_FUSES_TRANSP_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRANSP_Pos 18 /**< \brief (NVMCTRL_OTP4) USB pad Transp calibration */
// #define USB_FUSES_TRANSP_Msk (0x1Fu << USB_FUSES_TRANSP_Pos)
// #define USB_FUSES_TRANSP(value) ((USB_FUSES_TRANSP_Msk & ((value) << USB_FUSES_TRANSP_Pos)))
// #define USB_FUSES_TRIM_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRIM_Pos 23 /**< \brief (NVMCTRL_OTP4) USB pad Trim calibration */
// #define USB_FUSES_TRIM_Msk (0x7u << USB_FUSES_TRIM_Pos)
// #define USB_FUSES_TRIM(value) ((USB_FUSES_TRIM_Msk & ((value) << USB_FUSES_TRIM_Pos)))
//
fuse := *(*uint32)(unsafe.Pointer(uintptr(0x00806020) + 4))
calibTransN := uint16(fuse>>13) & uint16(0x1f)
calibTransP := uint16(fuse>>18) & uint16(0x1f)
calibTrim := uint16(fuse>>23) & uint16(0x7)
if calibTransN == 0x1f {
calibTransN = 5
}
sam.USB_DEVICE.PADCAL.SetBits(calibTransN << sam.USB_DEVICE_PADCAL_TRANSN_Pos)
if calibTransP == 0x1f {
calibTransP = 29
}
sam.USB_DEVICE.PADCAL.SetBits(calibTransP << sam.USB_DEVICE_PADCAL_TRANSP_Pos)
if calibTrim == 0x7 {
calibTrim = 3
}
sam.USB_DEVICE.PADCAL.SetBits(calibTrim << sam.USB_DEVICE_PADCAL_TRIM_Pos)
}
func handleUSB(intr interrupt.Interrupt) {
// reset all interrupt flags
flags := sam.USB_DEVICE.INTFLAG.Get()
sam.USB_DEVICE.INTFLAG.Set(flags)
// End of reset
if (flags & sam.USB_DEVICE_INTFLAG_EORST) > 0 {
// Configure control endpoint
initEndpoint(0, usb_ENDPOINT_TYPE_CONTROL)
// Enable Setup-Received interrupt
setEPINTENSET(0, sam.USB_DEVICE_EPINTENSET_RXSTP)
usbConfiguration = 0
// ack the End-Of-Reset interrupt
sam.USB_DEVICE.INTFLAG.Set(sam.USB_DEVICE_INTFLAG_EORST)
}
// Start of frame
if (flags & sam.USB_DEVICE_INTFLAG_SOF) > 0 {
USB.Flush()
// if you want to blink LED showing traffic, this would be the place...
if hidCallback != nil && !waitHidTxc {
hidCallback()
}
}
// Endpoint 0 Setup interrupt
if getEPINTFLAG(0)&sam.USB_DEVICE_EPINTFLAG_RXSTP > 0 {
// ack setup received
setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_RXSTP)
// parse setup
setup := newUSBSetup(udd_ep_out_cache_buffer[0][:])
// Clear the Bank 0 ready flag on Control OUT
setEPSTATUSCLR(0, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
ok := false
if (setup.bmRequestType & usb_REQUEST_TYPE) == usb_REQUEST_STANDARD {
// Standard Requests
ok = handleStandardSetup(setup)
} else {
// Class Interface Requests
if setup.wIndex == usb_CDC_ACM_INTERFACE {
ok = cdcSetup(setup)
} else if setup.bmRequestType == usb_SET_REPORT_TYPE && setup.bRequest == usb_SET_IDLE {
sendZlp()
ok = true
}
}
if ok {
// set Bank1 ready
setEPSTATUSSET(0, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
} else {
// Stall endpoint
setEPSTATUSSET(0, sam.USB_DEVICE_EPINTFLAG_STALL1)
}
if getEPINTFLAG(0)&sam.USB_DEVICE_EPINTFLAG_STALL1 > 0 {
// ack the stall
setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_STALL1)
// clear stall request
setEPINTENCLR(0, sam.USB_DEVICE_EPINTENCLR_STALL1)
}
}
// Now the actual transfer handlers, ignore endpoint number 0 (setup)
var i uint32
for i = 1; i < uint32(len(endPoints)); i++ {
// Check if endpoint has a pending interrupt
epFlags := getEPINTFLAG(i)
if (epFlags&sam.USB_DEVICE_EPINTFLAG_TRCPT0) > 0 ||
(epFlags&sam.USB_DEVICE_EPINTFLAG_TRCPT1) > 0 {
switch i {
case usb_CDC_ENDPOINT_OUT:
handleEndpoint(i)
setEPINTFLAG(i, epFlags)
case usb_CDC_ENDPOINT_IN, usb_CDC_ENDPOINT_ACM:
setEPSTATUSCLR(i, sam.USB_DEVICE_EPSTATUSCLR_BK1RDY)
setEPINTFLAG(i, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
if i == usb_CDC_ENDPOINT_IN {
USB.waitTxc = false
}
case usb_HID_ENDPOINT_IN:
setEPINTFLAG(i, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
waitHidTxc = false
}
}
}
}
func initEndpoint(ep, config uint32) {
switch config {
case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_INTERRUPT + 1) << sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
case usb_ENDPOINT_TYPE_BULK | usbEndpointOut:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_EPCFG_EPTYPE0_Pos))
// receive interrupts when current transfer complete
setEPINTENSET(ep, sam.USB_DEVICE_EPINTENSET_TRCPT0)
// set byte count to zero, we have not received anything yet
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// ready for next transfer
setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointOut:
// TODO: not really anything, seems like...
case usb_ENDPOINT_TYPE_BULK | usbEndpointIn:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
// NAK on endpoint IN, the bank is not yet filled in.
setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK1RDY)
case usb_ENDPOINT_TYPE_CONTROL:
// Control OUT
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_EPCFG_EPTYPE0_Pos))
// Control IN
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
// Prepare OUT endpoint for receive
// set multi packet size for expected number of receive bytes on control OUT
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set byte count to zero, we have not received anything yet
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// NAK on endpoint OUT to show we are ready to receive control data
setEPSTATUSSET(ep, sam.USB_DEVICE_EPSTATUSSET_BK0RDY)
}
}
func handleStandardSetup(setup usbSetup) bool {
switch setup.bRequest {
case usb_GET_STATUS:
buf := []byte{0, 0}
if setup.bmRequestType != 0 { // endpoint
// TODO: actually check if the endpoint in question is currently halted
if isEndpointHalt {
buf[0] = 1
}
}
sendUSBPacket(0, buf, setup.wLength)
return true
case usb_CLEAR_FEATURE:
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
isRemoteWakeUpEnabled = false
} else if setup.wValueL == 0 { // ENDPOINTHALT
isEndpointHalt = false
}
sendZlp()
return true
case usb_SET_FEATURE:
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
isRemoteWakeUpEnabled = true
} else if setup.wValueL == 0 { // ENDPOINTHALT
isEndpointHalt = true
}
sendZlp()
return true
case usb_SET_ADDRESS:
// set packet size 64 with auto Zlp after transfer
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE.Set((epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos) |
uint32(1<<31)) // autozlp
// ack the transfer is complete from the request
setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
// set bank ready for data
setEPSTATUSSET(0, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
// wait for transfer to complete
timeout := 3000
for (getEPINTFLAG(0) & sam.USB_DEVICE_EPINTFLAG_TRCPT1) == 0 {
timeout--
if timeout == 0 {
return true
}
}
// last, set the device address to that requested by host
sam.USB_DEVICE.DADD.SetBits(setup.wValueL)
sam.USB_DEVICE.DADD.SetBits(sam.USB_DEVICE_DADD_ADDEN)
return true
case usb_GET_DESCRIPTOR:
sendDescriptor(setup)
return true
case usb_SET_DESCRIPTOR:
return false
case usb_GET_CONFIGURATION:
buff := []byte{usbConfiguration}
sendUSBPacket(0, buff, setup.wLength)
return true
case usb_SET_CONFIGURATION:
if setup.bmRequestType&usb_REQUEST_RECIPIENT == usb_REQUEST_DEVICE {
for i := 1; i < len(endPoints); i++ {
initEndpoint(uint32(i), endPoints[i])
}
usbConfiguration = setup.wValueL
// Enable interrupt for CDC control messages from host (OUT packet)
setEPINTENSET(usb_CDC_ENDPOINT_ACM, sam.USB_DEVICE_EPINTENSET_TRCPT1)
// Enable interrupt for CDC data messages from host
setEPINTENSET(usb_CDC_ENDPOINT_OUT, sam.USB_DEVICE_EPINTENSET_TRCPT0)
// Enable interrupt for HID messages from host
if hidCallback != nil {
setEPINTENSET(usb_HID_ENDPOINT_IN, sam.USB_DEVICE_EPINTENSET_TRCPT1)
}
sendZlp()
return true
} else {
return false
}
case usb_GET_INTERFACE:
buff := []byte{usbSetInterface}
sendUSBPacket(0, buff, setup.wLength)
return true
case usb_SET_INTERFACE:
usbSetInterface = setup.wValueL
sendZlp()
return true
default:
return true
}
}
func cdcSetup(setup usbSetup) bool {
if setup.bmRequestType == usb_REQUEST_DEVICETOHOST_CLASS_INTERFACE {
if setup.bRequest == usb_CDC_GET_LINE_CODING {
var b [cdcLineInfoSize]byte
b[0] = byte(usbLineInfo.dwDTERate)
b[1] = byte(usbLineInfo.dwDTERate >> 8)
b[2] = byte(usbLineInfo.dwDTERate >> 16)
b[3] = byte(usbLineInfo.dwDTERate >> 24)
b[4] = byte(usbLineInfo.bCharFormat)
b[5] = byte(usbLineInfo.bParityType)
b[6] = byte(usbLineInfo.bDataBits)
sendUSBPacket(0, b[:], setup.wLength)
return true
}
}
if setup.bmRequestType == usb_REQUEST_HOSTTODEVICE_CLASS_INTERFACE {
if setup.bRequest == usb_CDC_SET_LINE_CODING {
b, err := receiveUSBControlPacket()
if err != nil {
return false
}
usbLineInfo.dwDTERate = uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
usbLineInfo.bCharFormat = b[4]
usbLineInfo.bParityType = b[5]
usbLineInfo.bDataBits = b[6]
}
if setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
usbLineInfo.lineState = setup.wValueL
}
if setup.bRequest == usb_CDC_SET_LINE_CODING || setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
// auto-reset into the bootloader
if usbLineInfo.dwDTERate == 1200 && usbLineInfo.lineState&usb_CDC_LINESTATE_DTR == 0 {
ResetProcessor()
} else {
// TODO: cancel any reset
}
sendZlp()
}
if setup.bRequest == usb_CDC_SEND_BREAK {
// TODO: something with this value?
// breakValue = ((uint16_t)setup.wValueH << 8) | setup.wValueL;
// return false;
sendZlp()
}
return true
}
return false
}
// SendUSBHIDPacket sends a packet for USBHID (interrupt / in).
func SendUSBHIDPacket(ep uint32, data []byte) bool {
if waitHidTxc {
return false
}
sendUSBPacket(ep, data, 0)
// clear transfer complete flag
setEPINTFLAG(ep, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
// send data by setting bank ready
setEPSTATUSSET(ep, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
waitHidTxc = true
return true
}
//go:noinline
func sendUSBPacket(ep uint32, data []byte, maxsize uint16) {
l := uint16(len(data))
if 0 < maxsize && maxsize < l {
l = maxsize
}
copy(udd_ep_in_cache_buffer[ep][:], data[:l])
// Set endpoint address for sending data
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// clear multi-packet size which is total bytes already sent
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set byte count, which is total number of bytes to be sent
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits((uint32(l) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
}
func receiveUSBControlPacket() ([cdcLineInfoSize]byte, error) {
var b [cdcLineInfoSize]byte
// address
usbEndpointDescriptors[0].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[0]))))
// set byte count to zero
usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// set ready for next data
setEPSTATUSCLR(0, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
// Wait until OUT transfer is ready.
timeout := 300000
for (getEPSTATUS(0) & sam.USB_DEVICE_EPSTATUS_BK0RDY) == 0 {
timeout--
if timeout == 0 {
return b, errUSBCDCReadTimeout
}
}
// Wait until OUT transfer is completed.
timeout = 300000
for (getEPINTFLAG(0) & sam.USB_DEVICE_EPINTFLAG_TRCPT0) == 0 {
timeout--
if timeout == 0 {
return b, errUSBCDCReadTimeout
}
}
// get data
bytesread := uint32((usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.Get() >>
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
if bytesread != cdcLineInfoSize {
return b, errUSBCDCBytesRead
}
copy(b[:7], udd_ep_out_cache_buffer[0][:7])
return b, nil
}
func handleEndpoint(ep uint32) {
// get data
count := int((usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.Get() >>
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
// move to ring buffer
for i := 0; i < count; i++ {
USB.Receive(byte((udd_ep_out_cache_buffer[ep][i] & 0xFF)))
}
// set byte count to zero
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// set multi packet size to 64
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set ready for next data
setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
}
func sendZlp() {
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
}
func epPacketSize(size uint16) uint32 {
switch size {
case 8:
return 0
case 16:
return 1
case 32:
return 2
case 64:
return 3
case 128:
return 4
case 256:
return 5
case 512:
return 6
case 1023:
return 7
default:
return 0
}
}
func getEPCFG(ep uint32) uint8 {
switch ep {
case 0:
return sam.USB_DEVICE.EPCFG0.Get()
case 1:
return sam.USB_DEVICE.EPCFG1.Get()
case 2:
return sam.USB_DEVICE.EPCFG2.Get()
case 3:
return sam.USB_DEVICE.EPCFG3.Get()
case 4:
return sam.USB_DEVICE.EPCFG4.Get()
case 5:
return sam.USB_DEVICE.EPCFG5.Get()
case 6:
return sam.USB_DEVICE.EPCFG6.Get()
case 7:
return sam.USB_DEVICE.EPCFG7.Get()
default:
return 0
}
}
func setEPCFG(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPCFG0.Set(val)
case 1:
sam.USB_DEVICE.EPCFG1.Set(val)
case 2:
sam.USB_DEVICE.EPCFG2.Set(val)
case 3:
sam.USB_DEVICE.EPCFG3.Set(val)
case 4:
sam.USB_DEVICE.EPCFG4.Set(val)
case 5:
sam.USB_DEVICE.EPCFG5.Set(val)
case 6:
sam.USB_DEVICE.EPCFG6.Set(val)
case 7:
sam.USB_DEVICE.EPCFG7.Set(val)
default:
return
}
}
func setEPSTATUSCLR(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPSTATUSCLR0.Set(val)
case 1:
sam.USB_DEVICE.EPSTATUSCLR1.Set(val)
case 2:
sam.USB_DEVICE.EPSTATUSCLR2.Set(val)
case 3:
sam.USB_DEVICE.EPSTATUSCLR3.Set(val)
case 4:
sam.USB_DEVICE.EPSTATUSCLR4.Set(val)
case 5:
sam.USB_DEVICE.EPSTATUSCLR5.Set(val)
case 6:
sam.USB_DEVICE.EPSTATUSCLR6.Set(val)
case 7:
sam.USB_DEVICE.EPSTATUSCLR7.Set(val)
default:
return
}
}
func setEPSTATUSSET(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPSTATUSSET0.Set(val)
case 1:
sam.USB_DEVICE.EPSTATUSSET1.Set(val)
case 2:
sam.USB_DEVICE.EPSTATUSSET2.Set(val)
case 3:
sam.USB_DEVICE.EPSTATUSSET3.Set(val)
case 4:
sam.USB_DEVICE.EPSTATUSSET4.Set(val)
case 5:
sam.USB_DEVICE.EPSTATUSSET5.Set(val)
case 6:
sam.USB_DEVICE.EPSTATUSSET6.Set(val)
case 7:
sam.USB_DEVICE.EPSTATUSSET7.Set(val)
default:
return
}
}
func getEPSTATUS(ep uint32) uint8 {
switch ep {
case 0:
return sam.USB_DEVICE.EPSTATUS0.Get()
case 1:
return sam.USB_DEVICE.EPSTATUS1.Get()
case 2:
return sam.USB_DEVICE.EPSTATUS2.Get()
case 3:
return sam.USB_DEVICE.EPSTATUS3.Get()
case 4:
return sam.USB_DEVICE.EPSTATUS4.Get()
case 5:
return sam.USB_DEVICE.EPSTATUS5.Get()
case 6:
return sam.USB_DEVICE.EPSTATUS6.Get()
case 7:
return sam.USB_DEVICE.EPSTATUS7.Get()
default:
return 0
}
}
func getEPINTFLAG(ep uint32) uint8 {
switch ep {
case 0:
return sam.USB_DEVICE.EPINTFLAG0.Get()
case 1:
return sam.USB_DEVICE.EPINTFLAG1.Get()
case 2:
return sam.USB_DEVICE.EPINTFLAG2.Get()
case 3:
return sam.USB_DEVICE.EPINTFLAG3.Get()
case 4:
return sam.USB_DEVICE.EPINTFLAG4.Get()
case 5:
return sam.USB_DEVICE.EPINTFLAG5.Get()
case 6:
return sam.USB_DEVICE.EPINTFLAG6.Get()
case 7:
return sam.USB_DEVICE.EPINTFLAG7.Get()
default:
return 0
}
}
func setEPINTFLAG(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPINTFLAG0.Set(val)
case 1:
sam.USB_DEVICE.EPINTFLAG1.Set(val)
case 2:
sam.USB_DEVICE.EPINTFLAG2.Set(val)
case 3:
sam.USB_DEVICE.EPINTFLAG3.Set(val)
case 4:
sam.USB_DEVICE.EPINTFLAG4.Set(val)
case 5:
sam.USB_DEVICE.EPINTFLAG5.Set(val)
case 6:
sam.USB_DEVICE.EPINTFLAG6.Set(val)
case 7:
sam.USB_DEVICE.EPINTFLAG7.Set(val)
default:
return
}
}
func setEPINTENCLR(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPINTENCLR0.Set(val)
case 1:
sam.USB_DEVICE.EPINTENCLR1.Set(val)
case 2:
sam.USB_DEVICE.EPINTENCLR2.Set(val)
case 3:
sam.USB_DEVICE.EPINTENCLR3.Set(val)
case 4:
sam.USB_DEVICE.EPINTENCLR4.Set(val)
case 5:
sam.USB_DEVICE.EPINTENCLR5.Set(val)
case 6:
sam.USB_DEVICE.EPINTENCLR6.Set(val)
case 7:
sam.USB_DEVICE.EPINTENCLR7.Set(val)
default:
return
}
}
func setEPINTENSET(ep uint32, val uint8) {
switch ep {
case 0:
sam.USB_DEVICE.EPINTENSET0.Set(val)
case 1:
sam.USB_DEVICE.EPINTENSET1.Set(val)
case 2:
sam.USB_DEVICE.EPINTENSET2.Set(val)
case 3:
sam.USB_DEVICE.EPINTENSET3.Set(val)
case 4:
sam.USB_DEVICE.EPINTENSET4.Set(val)
case 5:
sam.USB_DEVICE.EPINTENSET5.Set(val)
case 6:
sam.USB_DEVICE.EPINTENSET6.Set(val)
case 7:
sam.USB_DEVICE.EPINTENSET7.Set(val)
default:
return
}
}

754
src/machine/machine_atsamd51.go
Просмотреть файл

@ -13,7 +13,6 @@ import (
"device/sam"
"errors"
"runtime/interrupt"
"runtime/volatile"
"unsafe"
)
@ -1975,759 +1974,6 @@ func (tcc *TCC) Set(channel uint8, value uint32) {
}
}
// USBCDC is the USB CDC aka serial over USB interface on the SAMD21.
type USBCDC struct {
Buffer *RingBuffer
TxIdx volatile.Register8
waitTxc bool
waitTxcRetryCount uint8
sent bool
configured bool
}
var (
// USB is a USB CDC interface.
USB = &USBCDC{Buffer: NewRingBuffer()}
waitHidTxc bool
)
const (
usbcdcTxSizeMask uint8 = 0x3F
usbcdcTxBankMask uint8 = ^usbcdcTxSizeMask
usbcdcTxBank1st uint8 = 0x00
usbcdcTxBank2nd uint8 = usbcdcTxSizeMask + 1
usbcdcTxMaxRetriesAllowed uint8 = 5
)
// Flush flushes buffered data.
func (usbcdc *USBCDC) Flush() error {
if usbLineInfo.lineState > 0 {
idx := usbcdc.TxIdx.Get()
sz := idx & usbcdcTxSizeMask
bk := idx & usbcdcTxBankMask
if 0 < sz {
if usbcdc.waitTxc {
// waiting for the next flush(), because the transmission is not complete
usbcdc.waitTxcRetryCount++
return nil
}
usbcdc.waitTxc = true
usbcdc.waitTxcRetryCount = 0
// set the data
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][bk]))))
if bk == usbcdcTxBank1st {
usbcdc.TxIdx.Set(usbcdcTxBank2nd)
} else {
usbcdc.TxIdx.Set(usbcdcTxBank1st)
}
// clean multi packet size of bytes already sent
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set count of bytes to be sent
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.SetBits((uint32(sz) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// clear transfer complete flag
setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
// send data by setting bank ready
setEPSTATUSSET(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
usbcdc.sent = true
}
}
return nil
}
// WriteByte writes a byte of data to the USB CDC interface.
func (usbcdc *USBCDC) WriteByte(c byte) error {
// Supposedly to handle problem with Windows USB serial ports?
if usbLineInfo.lineState > 0 {
ok := false
for {
mask := interrupt.Disable()
idx := usbcdc.TxIdx.Get()
if (idx & usbcdcTxSizeMask) < usbcdcTxSizeMask {
udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][idx] = c
usbcdc.TxIdx.Set(idx + 1)
ok = true
}
interrupt.Restore(mask)
if ok {
break
} else if usbcdcTxMaxRetriesAllowed < usbcdc.waitTxcRetryCount {
mask := interrupt.Disable()
usbcdc.waitTxc = false
usbcdc.waitTxcRetryCount = 0
usbcdc.TxIdx.Set(0)
usbLineInfo.lineState = 0
interrupt.Restore(mask)
break
} else {
mask := interrupt.Disable()
if usbcdc.sent {
if usbcdc.waitTxc {
if (getEPINTFLAG(usb_CDC_ENDPOINT_IN) & sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) != 0 {
setEPSTATUSCLR(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
usbcdc.waitTxc = false
usbcdc.Flush()
}
} else {
usbcdc.Flush()
}
}
interrupt.Restore(mask)
}
}
}
return nil
}
func (usbcdc *USBCDC) DTR() bool {
return (usbLineInfo.lineState & usb_CDC_LINESTATE_DTR) > 0
}
func (usbcdc *USBCDC) RTS() bool {
return (usbLineInfo.lineState & usb_CDC_LINESTATE_RTS) > 0
}
const (
// these are SAMD51 specific.
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos = 0
usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask = 0x3FFF
usb_DEVICE_PCKSIZE_SIZE_Pos = 28
usb_DEVICE_PCKSIZE_SIZE_Mask = 0x7
usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos = 14
usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask = 0x3FFF
)
var (
usbEndpointDescriptors [8]usbDeviceDescriptor
udd_ep_in_cache_buffer [7][128]uint8
udd_ep_out_cache_buffer [7][128]uint8
isEndpointHalt = false
isRemoteWakeUpEnabled = false
endPoints = []uint32{usb_ENDPOINT_TYPE_CONTROL,
(usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn),
(usb_ENDPOINT_TYPE_BULK | usbEndpointOut),
(usb_ENDPOINT_TYPE_BULK | usbEndpointIn)}
usbConfiguration uint8
usbSetInterface uint8
usbLineInfo = cdcLineInfo{115200, 0x00, 0x00, 0x08, 0x00}
)
// Configure the USB CDC interface. The config is here for compatibility with the UART interface.
func (usbcdc *USBCDC) Configure(config UARTConfig) {
// reset USB interface
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_SWRST)
for sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_SWRST) ||
sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_ENABLE) {
}
sam.USB_DEVICE.DESCADD.Set(uint32(uintptr(unsafe.Pointer(&usbEndpointDescriptors))))
// configure pins
USBCDC_DM_PIN.Configure(PinConfig{Mode: PinCom})
USBCDC_DP_PIN.Configure(PinConfig{Mode: PinCom})
// performs pad calibration from store fuses
handlePadCalibration()
// run in standby
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_RUNSTDBY)
// set full speed
sam.USB_DEVICE.CTRLB.SetBits(sam.USB_DEVICE_CTRLB_SPDCONF_FS << sam.USB_DEVICE_CTRLB_SPDCONF_Pos)
// attach
sam.USB_DEVICE.CTRLB.ClearBits(sam.USB_DEVICE_CTRLB_DETACH)
// enable interrupt for end of reset
sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_EORST)
// enable interrupt for start of frame
sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_SOF)
// enable USB
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_ENABLE)
// enable IRQ at highest priority
interrupt.New(sam.IRQ_USB_OTHER, handleUSBIRQ).Enable()
interrupt.New(sam.IRQ_USB_SOF_HSOF, handleUSBIRQ).Enable()
interrupt.New(sam.IRQ_USB_TRCPT0, handleUSBIRQ).Enable()
interrupt.New(sam.IRQ_USB_TRCPT1, handleUSBIRQ).Enable()
usbcdc.configured = true
}
// Configured returns whether usbcdc is configured or not.
func (usbcdc *USBCDC) Configured() bool {
return usbcdc.configured
}
func handlePadCalibration() {
// Load Pad Calibration data from non-volatile memory
// This requires registers that are not included in the SVD file.
// Modeled after defines from samd21g18a.h and nvmctrl.h:
//
// #define NVMCTRL_OTP4 0x00806020
//
// #define USB_FUSES_TRANSN_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRANSN_Pos 13 /**< \brief (NVMCTRL_OTP4) USB pad Transn calibration */
// #define USB_FUSES_TRANSN_Msk (0x1Fu << USB_FUSES_TRANSN_Pos)
// #define USB_FUSES_TRANSN(value) ((USB_FUSES_TRANSN_Msk & ((value) << USB_FUSES_TRANSN_Pos)))
// #define USB_FUSES_TRANSP_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRANSP_Pos 18 /**< \brief (NVMCTRL_OTP4) USB pad Transp calibration */
// #define USB_FUSES_TRANSP_Msk (0x1Fu << USB_FUSES_TRANSP_Pos)
// #define USB_FUSES_TRANSP(value) ((USB_FUSES_TRANSP_Msk & ((value) << USB_FUSES_TRANSP_Pos)))
// #define USB_FUSES_TRIM_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRIM_Pos 23 /**< \brief (NVMCTRL_OTP4) USB pad Trim calibration */
// #define USB_FUSES_TRIM_Msk (0x7u << USB_FUSES_TRIM_Pos)
// #define USB_FUSES_TRIM(value) ((USB_FUSES_TRIM_Msk & ((value) << USB_FUSES_TRIM_Pos)))
//
fuse := *(*uint32)(unsafe.Pointer(uintptr(0x00806020) + 4))
calibTransN := uint16(fuse>>13) & uint16(0x1f)
calibTransP := uint16(fuse>>18) & uint16(0x1f)
calibTrim := uint16(fuse>>23) & uint16(0x7)
if calibTransN == 0x1f {
calibTransN = 5
}
sam.USB_DEVICE.PADCAL.SetBits(calibTransN << sam.USB_DEVICE_PADCAL_TRANSN_Pos)
if calibTransP == 0x1f {
calibTransP = 29
}
sam.USB_DEVICE.PADCAL.SetBits(calibTransP << sam.USB_DEVICE_PADCAL_TRANSP_Pos)
if calibTrim == 0x7 {
calibTrim = 3
}
sam.USB_DEVICE.PADCAL.SetBits(calibTrim << sam.USB_DEVICE_PADCAL_TRIM_Pos)
}
func handleUSBIRQ(interrupt.Interrupt) {
// reset all interrupt flags
flags := sam.USB_DEVICE.INTFLAG.Get()
sam.USB_DEVICE.INTFLAG.Set(flags)
// End of reset
if (flags & sam.USB_DEVICE_INTFLAG_EORST) > 0 {
// Configure control endpoint
initEndpoint(0, usb_ENDPOINT_TYPE_CONTROL)
// Enable Setup-Received interrupt
setEPINTENSET(0, sam.USB_DEVICE_ENDPOINT_EPINTENSET_RXSTP)
usbConfiguration = 0
// ack the End-Of-Reset interrupt
sam.USB_DEVICE.INTFLAG.Set(sam.USB_DEVICE_INTFLAG_EORST)
}
// Start of frame
if (flags & sam.USB_DEVICE_INTFLAG_SOF) > 0 {
USB.Flush()
if hidCallback != nil && !waitHidTxc {
hidCallback()
}
// if you want to blink LED showing traffic, this would be the place...
}
// Endpoint 0 Setup interrupt
if getEPINTFLAG(0)&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_RXSTP > 0 {
// ack setup received
setEPINTFLAG(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_RXSTP)
// parse setup
setup := newUSBSetup(udd_ep_out_cache_buffer[0][:])
// Clear the Bank 0 ready flag on Control OUT
setEPSTATUSCLR(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
ok := false
if (setup.bmRequestType & usb_REQUEST_TYPE) == usb_REQUEST_STANDARD {
// Standard Requests
ok = handleStandardSetup(setup)
} else {
// Class Interface Requests
if setup.wIndex == usb_CDC_ACM_INTERFACE {
ok = cdcSetup(setup)
} else if setup.bmRequestType == usb_SET_REPORT_TYPE && setup.bRequest == usb_SET_IDLE {
sendZlp()
ok = true
}
}
if ok {
// set Bank1 ready
setEPSTATUSSET(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
} else {
// Stall endpoint
setEPSTATUSSET(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1)
}
if getEPINTFLAG(0)&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1 > 0 {
// ack the stall
setEPINTFLAG(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1)
// clear stall request
setEPINTENCLR(0, sam.USB_DEVICE_ENDPOINT_EPINTENCLR_STALL1)
}
}
// Now the actual transfer handlers, ignore endpoint number 0 (setup)
var i uint32
for i = 1; i < uint32(len(endPoints)); i++ {
// Check if endpoint has a pending interrupt
epFlags := getEPINTFLAG(i)
if (epFlags&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT0) > 0 ||
(epFlags&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) > 0 {
switch i {
case usb_CDC_ENDPOINT_OUT:
handleEndpoint(i)
setEPINTFLAG(i, epFlags)
case usb_CDC_ENDPOINT_IN, usb_CDC_ENDPOINT_ACM:
setEPSTATUSCLR(i, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
setEPINTFLAG(i, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
if i == usb_CDC_ENDPOINT_IN {
USB.waitTxc = false
}
case usb_HID_ENDPOINT_IN:
setEPINTFLAG(i, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
waitHidTxc = false
}
}
}
}
func initEndpoint(ep, config uint32) {
switch config {
case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_INTERRUPT + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
case usb_ENDPOINT_TYPE_BULK | usbEndpointOut:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE0_Pos))
// receive interrupts when current transfer complete
setEPINTENSET(ep, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT0)
// set byte count to zero, we have not received anything yet
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// ready for next transfer
setEPSTATUSCLR(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointOut:
// TODO: not really anything, seems like...
case usb_ENDPOINT_TYPE_BULK | usbEndpointIn:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
// NAK on endpoint IN, the bank is not yet filled in.
setEPSTATUSCLR(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
case usb_ENDPOINT_TYPE_CONTROL:
// Control OUT
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE0_Pos))
// Control IN
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
// Prepare OUT endpoint for receive
// set multi packet size for expected number of receive bytes on control OUT
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set byte count to zero, we have not received anything yet
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// NAK on endpoint OUT to show we are ready to receive control data
setEPSTATUSSET(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK0RDY)
}
}
func handleStandardSetup(setup usbSetup) bool {
switch setup.bRequest {
case usb_GET_STATUS:
buf := []byte{0, 0}
if setup.bmRequestType != 0 { // endpoint
// TODO: actually check if the endpoint in question is currently halted
if isEndpointHalt {
buf[0] = 1
}
}
sendUSBPacket(0, buf, setup.wLength)
return true
case usb_CLEAR_FEATURE:
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
isRemoteWakeUpEnabled = false
} else if setup.wValueL == 0 { // ENDPOINTHALT
isEndpointHalt = false
}
sendZlp()
return true
case usb_SET_FEATURE:
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
isRemoteWakeUpEnabled = true
} else if setup.wValueL == 0 { // ENDPOINTHALT
isEndpointHalt = true
}
sendZlp()
return true
case usb_SET_ADDRESS:
// set packet size 64 with auto Zlp after transfer
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE.Set((epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos) |
uint32(1<<31)) // autozlp
// ack the transfer is complete from the request
setEPINTFLAG(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
// set bank ready for data
setEPSTATUSSET(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
// wait for transfer to complete
timeout := 3000
for (getEPINTFLAG(0) & sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) == 0 {
timeout--
if timeout == 0 {
return true
}
}
// last, set the device address to that requested by host
sam.USB_DEVICE.DADD.SetBits(setup.wValueL)
sam.USB_DEVICE.DADD.SetBits(sam.USB_DEVICE_DADD_ADDEN)
return true
case usb_GET_DESCRIPTOR:
sendDescriptor(setup)
return true
case usb_SET_DESCRIPTOR:
return false
case usb_GET_CONFIGURATION:
buff := []byte{usbConfiguration}
sendUSBPacket(0, buff, setup.wLength)
return true
case usb_SET_CONFIGURATION:
if setup.bmRequestType&usb_REQUEST_RECIPIENT == usb_REQUEST_DEVICE {
for i := 1; i < len(endPoints); i++ {
initEndpoint(uint32(i), endPoints[i])
}
usbConfiguration = setup.wValueL
// Enable interrupt for CDC control messages from host (OUT packet)
setEPINTENSET(usb_CDC_ENDPOINT_ACM, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT1)
// Enable interrupt for CDC data messages from host
setEPINTENSET(usb_CDC_ENDPOINT_OUT, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT0)
// Enable interrupt for HID messages from host
if hidCallback != nil {
setEPINTENSET(usb_HID_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT1)
}
sendZlp()
return true
} else {
return false
}
case usb_GET_INTERFACE:
buff := []byte{usbSetInterface}
sendUSBPacket(0, buff, setup.wLength)
return true
case usb_SET_INTERFACE:
usbSetInterface = setup.wValueL
sendZlp()
return true
default:
return true
}
}
func cdcSetup(setup usbSetup) bool {
if setup.bmRequestType == usb_REQUEST_DEVICETOHOST_CLASS_INTERFACE {
if setup.bRequest == usb_CDC_GET_LINE_CODING {
var b [cdcLineInfoSize]byte
b[0] = byte(usbLineInfo.dwDTERate)
b[1] = byte(usbLineInfo.dwDTERate >> 8)
b[2] = byte(usbLineInfo.dwDTERate >> 16)
b[3] = byte(usbLineInfo.dwDTERate >> 24)
b[4] = byte(usbLineInfo.bCharFormat)
b[5] = byte(usbLineInfo.bParityType)
b[6] = byte(usbLineInfo.bDataBits)
sendUSBPacket(0, b[:], setup.wLength)
return true
}
}
if setup.bmRequestType == usb_REQUEST_HOSTTODEVICE_CLASS_INTERFACE {
if setup.bRequest == usb_CDC_SET_LINE_CODING {
b, err := receiveUSBControlPacket()
if err != nil {
return false
}
usbLineInfo.dwDTERate = uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
usbLineInfo.bCharFormat = b[4]
usbLineInfo.bParityType = b[5]
usbLineInfo.bDataBits = b[6]
}
if setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
usbLineInfo.lineState = setup.wValueL
}
if setup.bRequest == usb_CDC_SET_LINE_CODING || setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
// auto-reset into the bootloader
if usbLineInfo.dwDTERate == 1200 && usbLineInfo.lineState&usb_CDC_LINESTATE_DTR == 0 {
ResetProcessor()
} else {
// TODO: cancel any reset
}
sendZlp()
}
if setup.bRequest == usb_CDC_SEND_BREAK {
// TODO: something with this value?
// breakValue = ((uint16_t)setup.wValueH << 8) | setup.wValueL;
// return false;
sendZlp()
}
return true
}
return false
}
// SendUSBHIDPacket sends a packet for USBHID (interrupt / in).
func SendUSBHIDPacket(ep uint32, data []byte) bool {
if waitHidTxc {
return false
}
sendUSBPacket(ep, data, 0)
// clear transfer complete flag
setEPINTFLAG(ep, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
// send data by setting bank ready
setEPSTATUSSET(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
waitHidTxc = true
return true
}
//go:noinline
func sendUSBPacket(ep uint32, data []byte, maxsize uint16) {
l := uint16(len(data))
if 0 < maxsize && maxsize < l {
l = maxsize
}
copy(udd_ep_in_cache_buffer[ep][:], data[:l])
// Set endpoint address for sending data
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// clear multi-packet size which is total bytes already sent
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set byte count, which is total number of bytes to be sent
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits((uint32(l) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
}
func receiveUSBControlPacket() ([cdcLineInfoSize]byte, error) {
var b [cdcLineInfoSize]byte
// address
usbEndpointDescriptors[0].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[0]))))
// set byte count to zero
usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// set ready for next data
setEPSTATUSCLR(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
// Wait until OUT transfer is ready.
timeout := 300000
for (getEPSTATUS(0) & sam.USB_DEVICE_ENDPOINT_EPSTATUS_BK0RDY) == 0 {
timeout--
if timeout == 0 {
return b, errUSBCDCReadTimeout
}
}
// Wait until OUT transfer is completed.
timeout = 300000
for (getEPINTFLAG(0) & sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) == 0 {
timeout--
if timeout == 0 {
return b, errUSBCDCReadTimeout
}
}
// get data
bytesread := uint32((usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.Get() >>
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
if bytesread != cdcLineInfoSize {
return b, errUSBCDCBytesRead
}
copy(b[:7], udd_ep_out_cache_buffer[0][:7])
return b, nil
}
func handleEndpoint(ep uint32) {
// get data
count := int((usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.Get() >>
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
// move to ring buffer
for i := 0; i < count; i++ {
USB.Receive(byte((udd_ep_out_cache_buffer[ep][i] & 0xFF)))
}
// set byte count to zero
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// set multi packet size to 64
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set ready for next data
setEPSTATUSCLR(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
}
func sendZlp() {
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
}
func epPacketSize(size uint16) uint32 {
switch size {
case 8:
return 0
case 16:
return 1
case 32:
return 2
case 64:
return 3
case 128:
return 4
case 256:
return 5
case 512:
return 6
case 1023:
return 7
default:
return 0
}
}
func getEPCFG(ep uint32) uint8 {
return sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPCFG.Get()
}
func setEPCFG(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPCFG.Set(val)
}
func setEPSTATUSCLR(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPSTATUSCLR.Set(val)
}
func setEPSTATUSSET(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPSTATUSSET.Set(val)
}
func getEPSTATUS(ep uint32) uint8 {
return sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPSTATUS.Get()
}
func getEPINTFLAG(ep uint32) uint8 {
return sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPINTFLAG.Get()
}
func setEPINTFLAG(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPINTFLAG.Set(val)
}
func setEPINTENCLR(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPINTENCLR.Set(val)
}
func setEPINTENSET(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPINTENSET.Set(val)
}
// ResetProcessor should perform a system reset in preparation
// to switch to the bootloader to flash new firmware.
func ResetProcessor() {

769
src/machine/machine_atsamd51_usb.go Обычный файл
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@ -0,0 +1,769 @@
//go:build (sam && atsamd51) || (sam && atsame5x)
// +build sam,atsamd51 sam,atsame5x
// Peripheral abstraction layer for the atsamd51.
//
// Datasheet:
// http://ww1.microchip.com/downloads/en/DeviceDoc/60001507C.pdf
//
package machine
import (
"device/sam"
"runtime/interrupt"
"runtime/volatile"
"unsafe"
)
// USBCDC is the USB CDC aka serial over USB interface on the SAMD21.
type USBCDC struct {
Buffer *RingBuffer
TxIdx volatile.Register8
waitTxc bool
waitTxcRetryCount uint8
sent bool
configured bool
}
var (
// USB is a USB CDC interface.
USB = &USBCDC{Buffer: NewRingBuffer()}
waitHidTxc bool
)
const (
usbcdcTxSizeMask uint8 = 0x3F
usbcdcTxBankMask uint8 = ^usbcdcTxSizeMask
usbcdcTxBank1st uint8 = 0x00
usbcdcTxBank2nd uint8 = usbcdcTxSizeMask + 1
usbcdcTxMaxRetriesAllowed uint8 = 5
)
// Flush flushes buffered data.
func (usbcdc *USBCDC) Flush() error {
if usbLineInfo.lineState > 0 {
idx := usbcdc.TxIdx.Get()
sz := idx & usbcdcTxSizeMask
bk := idx & usbcdcTxBankMask
if 0 < sz {
if usbcdc.waitTxc {
// waiting for the next flush(), because the transmission is not complete
usbcdc.waitTxcRetryCount++
return nil
}
usbcdc.waitTxc = true
usbcdc.waitTxcRetryCount = 0
// set the data
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][bk]))))
if bk == usbcdcTxBank1st {
usbcdc.TxIdx.Set(usbcdcTxBank2nd)
} else {
usbcdc.TxIdx.Set(usbcdcTxBank1st)
}
// clean multi packet size of bytes already sent
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set count of bytes to be sent
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.SetBits((uint32(sz) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// clear transfer complete flag
setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
// send data by setting bank ready
setEPSTATUSSET(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
usbcdc.sent = true
}
}
return nil
}
// WriteByte writes a byte of data to the USB CDC interface.
func (usbcdc *USBCDC) WriteByte(c byte) error {
// Supposedly to handle problem with Windows USB serial ports?
if usbLineInfo.lineState > 0 {
ok := false
for {
mask := interrupt.Disable()
idx := usbcdc.TxIdx.Get()
if (idx & usbcdcTxSizeMask) < usbcdcTxSizeMask {
udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][idx] = c
usbcdc.TxIdx.Set(idx + 1)
ok = true
}
interrupt.Restore(mask)
if ok {
break
} else if usbcdcTxMaxRetriesAllowed < usbcdc.waitTxcRetryCount {
mask := interrupt.Disable()
usbcdc.waitTxc = false
usbcdc.waitTxcRetryCount = 0
usbcdc.TxIdx.Set(0)
usbLineInfo.lineState = 0
interrupt.Restore(mask)
break
} else {
mask := interrupt.Disable()
if usbcdc.sent {
if usbcdc.waitTxc {
if (getEPINTFLAG(usb_CDC_ENDPOINT_IN) & sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) != 0 {
setEPSTATUSCLR(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
usbcdc.waitTxc = false
usbcdc.Flush()
}
} else {
usbcdc.Flush()
}
}
interrupt.Restore(mask)
}
}
}
return nil
}
func (usbcdc *USBCDC) DTR() bool {
return (usbLineInfo.lineState & usb_CDC_LINESTATE_DTR) > 0
}
func (usbcdc *USBCDC) RTS() bool {
return (usbLineInfo.lineState & usb_CDC_LINESTATE_RTS) > 0
}
const (
// these are SAMD51 specific.
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos = 0
usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask = 0x3FFF
usb_DEVICE_PCKSIZE_SIZE_Pos = 28
usb_DEVICE_PCKSIZE_SIZE_Mask = 0x7
usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos = 14
usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask = 0x3FFF
)
var (
usbEndpointDescriptors [8]usbDeviceDescriptor
udd_ep_in_cache_buffer [7][128]uint8
udd_ep_out_cache_buffer [7][128]uint8
isEndpointHalt = false
isRemoteWakeUpEnabled = false
endPoints = []uint32{usb_ENDPOINT_TYPE_CONTROL,
(usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn),
(usb_ENDPOINT_TYPE_BULK | usbEndpointOut),
(usb_ENDPOINT_TYPE_BULK | usbEndpointIn)}
usbConfiguration uint8
usbSetInterface uint8
usbLineInfo = cdcLineInfo{115200, 0x00, 0x00, 0x08, 0x00}
)
// Configure the USB CDC interface. The config is here for compatibility with the UART interface.
func (usbcdc *USBCDC) Configure(config UARTConfig) {
// reset USB interface
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_SWRST)
for sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_SWRST) ||
sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_ENABLE) {
}
sam.USB_DEVICE.DESCADD.Set(uint32(uintptr(unsafe.Pointer(&usbEndpointDescriptors))))
// configure pins
USBCDC_DM_PIN.Configure(PinConfig{Mode: PinCom})
USBCDC_DP_PIN.Configure(PinConfig{Mode: PinCom})
// performs pad calibration from store fuses
handlePadCalibration()
// run in standby
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_RUNSTDBY)
// set full speed
sam.USB_DEVICE.CTRLB.SetBits(sam.USB_DEVICE_CTRLB_SPDCONF_FS << sam.USB_DEVICE_CTRLB_SPDCONF_Pos)
// attach
sam.USB_DEVICE.CTRLB.ClearBits(sam.USB_DEVICE_CTRLB_DETACH)
// enable interrupt for end of reset
sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_EORST)
// enable interrupt for start of frame
sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_SOF)
// enable USB
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_ENABLE)
// enable IRQ at highest priority
interrupt.New(sam.IRQ_USB_OTHER, handleUSBIRQ).Enable()
interrupt.New(sam.IRQ_USB_SOF_HSOF, handleUSBIRQ).Enable()
interrupt.New(sam.IRQ_USB_TRCPT0, handleUSBIRQ).Enable()
interrupt.New(sam.IRQ_USB_TRCPT1, handleUSBIRQ).Enable()
usbcdc.configured = true
}
// Configured returns whether usbcdc is configured or not.
func (usbcdc *USBCDC) Configured() bool {
return usbcdc.configured
}
func handlePadCalibration() {
// Load Pad Calibration data from non-volatile memory
// This requires registers that are not included in the SVD file.
// Modeled after defines from samd21g18a.h and nvmctrl.h:
//
// #define NVMCTRL_OTP4 0x00806020
//
// #define USB_FUSES_TRANSN_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRANSN_Pos 13 /**< \brief (NVMCTRL_OTP4) USB pad Transn calibration */
// #define USB_FUSES_TRANSN_Msk (0x1Fu << USB_FUSES_TRANSN_Pos)
// #define USB_FUSES_TRANSN(value) ((USB_FUSES_TRANSN_Msk & ((value) << USB_FUSES_TRANSN_Pos)))
// #define USB_FUSES_TRANSP_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRANSP_Pos 18 /**< \brief (NVMCTRL_OTP4) USB pad Transp calibration */
// #define USB_FUSES_TRANSP_Msk (0x1Fu << USB_FUSES_TRANSP_Pos)
// #define USB_FUSES_TRANSP(value) ((USB_FUSES_TRANSP_Msk & ((value) << USB_FUSES_TRANSP_Pos)))
// #define USB_FUSES_TRIM_ADDR (NVMCTRL_OTP4 + 4)
// #define USB_FUSES_TRIM_Pos 23 /**< \brief (NVMCTRL_OTP4) USB pad Trim calibration */
// #define USB_FUSES_TRIM_Msk (0x7u << USB_FUSES_TRIM_Pos)
// #define USB_FUSES_TRIM(value) ((USB_FUSES_TRIM_Msk & ((value) << USB_FUSES_TRIM_Pos)))
//
fuse := *(*uint32)(unsafe.Pointer(uintptr(0x00806020) + 4))
calibTransN := uint16(fuse>>13) & uint16(0x1f)
calibTransP := uint16(fuse>>18) & uint16(0x1f)
calibTrim := uint16(fuse>>23) & uint16(0x7)
if calibTransN == 0x1f {
calibTransN = 5
}
sam.USB_DEVICE.PADCAL.SetBits(calibTransN << sam.USB_DEVICE_PADCAL_TRANSN_Pos)
if calibTransP == 0x1f {
calibTransP = 29
}
sam.USB_DEVICE.PADCAL.SetBits(calibTransP << sam.USB_DEVICE_PADCAL_TRANSP_Pos)
if calibTrim == 0x7 {
calibTrim = 3
}
sam.USB_DEVICE.PADCAL.SetBits(calibTrim << sam.USB_DEVICE_PADCAL_TRIM_Pos)
}
func handleUSBIRQ(interrupt.Interrupt) {
// reset all interrupt flags
flags := sam.USB_DEVICE.INTFLAG.Get()
sam.USB_DEVICE.INTFLAG.Set(flags)
// End of reset
if (flags & sam.USB_DEVICE_INTFLAG_EORST) > 0 {
// Configure control endpoint
initEndpoint(0, usb_ENDPOINT_TYPE_CONTROL)
// Enable Setup-Received interrupt
setEPINTENSET(0, sam.USB_DEVICE_ENDPOINT_EPINTENSET_RXSTP)
usbConfiguration = 0
// ack the End-Of-Reset interrupt
sam.USB_DEVICE.INTFLAG.Set(sam.USB_DEVICE_INTFLAG_EORST)
}
// Start of frame
if (flags & sam.USB_DEVICE_INTFLAG_SOF) > 0 {
USB.Flush()
if hidCallback != nil && !waitHidTxc {
hidCallback()
}
// if you want to blink LED showing traffic, this would be the place...
}
// Endpoint 0 Setup interrupt
if getEPINTFLAG(0)&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_RXSTP > 0 {
// ack setup received
setEPINTFLAG(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_RXSTP)
// parse setup
setup := newUSBSetup(udd_ep_out_cache_buffer[0][:])
// Clear the Bank 0 ready flag on Control OUT
setEPSTATUSCLR(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
ok := false
if (setup.bmRequestType & usb_REQUEST_TYPE) == usb_REQUEST_STANDARD {
// Standard Requests
ok = handleStandardSetup(setup)
} else {
// Class Interface Requests
if setup.wIndex == usb_CDC_ACM_INTERFACE {
ok = cdcSetup(setup)
} else if setup.bmRequestType == usb_SET_REPORT_TYPE && setup.bRequest == usb_SET_IDLE {
sendZlp()
ok = true
}
}
if ok {
// set Bank1 ready
setEPSTATUSSET(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
} else {
// Stall endpoint
setEPSTATUSSET(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1)
}
if getEPINTFLAG(0)&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1 > 0 {
// ack the stall
setEPINTFLAG(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1)
// clear stall request
setEPINTENCLR(0, sam.USB_DEVICE_ENDPOINT_EPINTENCLR_STALL1)
}
}
// Now the actual transfer handlers, ignore endpoint number 0 (setup)
var i uint32
for i = 1; i < uint32(len(endPoints)); i++ {
// Check if endpoint has a pending interrupt
epFlags := getEPINTFLAG(i)
if (epFlags&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT0) > 0 ||
(epFlags&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) > 0 {
switch i {
case usb_CDC_ENDPOINT_OUT:
handleEndpoint(i)
setEPINTFLAG(i, epFlags)
case usb_CDC_ENDPOINT_IN, usb_CDC_ENDPOINT_ACM:
setEPSTATUSCLR(i, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
setEPINTFLAG(i, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
if i == usb_CDC_ENDPOINT_IN {
USB.waitTxc = false
}
case usb_HID_ENDPOINT_IN:
setEPINTFLAG(i, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
waitHidTxc = false
}
}
}
}
func initEndpoint(ep, config uint32) {
switch config {
case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_INTERRUPT + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
case usb_ENDPOINT_TYPE_BULK | usbEndpointOut:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE0_Pos))
// receive interrupts when current transfer complete
setEPINTENSET(ep, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT0)
// set byte count to zero, we have not received anything yet
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// ready for next transfer
setEPSTATUSCLR(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointOut:
// TODO: not really anything, seems like...
case usb_ENDPOINT_TYPE_BULK | usbEndpointIn:
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
// NAK on endpoint IN, the bank is not yet filled in.
setEPSTATUSCLR(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
case usb_ENDPOINT_TYPE_CONTROL:
// Control OUT
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE0_Pos))
// Control IN
// set packet size
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
// set data buffer address
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// set endpoint type
setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
// Prepare OUT endpoint for receive
// set multi packet size for expected number of receive bytes on control OUT
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set byte count to zero, we have not received anything yet
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// NAK on endpoint OUT to show we are ready to receive control data
setEPSTATUSSET(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK0RDY)
}
}
func handleStandardSetup(setup usbSetup) bool {
switch setup.bRequest {
case usb_GET_STATUS:
buf := []byte{0, 0}
if setup.bmRequestType != 0 { // endpoint
// TODO: actually check if the endpoint in question is currently halted
if isEndpointHalt {
buf[0] = 1
}
}
sendUSBPacket(0, buf, setup.wLength)
return true
case usb_CLEAR_FEATURE:
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
isRemoteWakeUpEnabled = false
} else if setup.wValueL == 0 { // ENDPOINTHALT
isEndpointHalt = false
}
sendZlp()
return true
case usb_SET_FEATURE:
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
isRemoteWakeUpEnabled = true
} else if setup.wValueL == 0 { // ENDPOINTHALT
isEndpointHalt = true
}
sendZlp()
return true
case usb_SET_ADDRESS:
// set packet size 64 with auto Zlp after transfer
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE.Set((epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos) |
uint32(1<<31)) // autozlp
// ack the transfer is complete from the request
setEPINTFLAG(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
// set bank ready for data
setEPSTATUSSET(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
// wait for transfer to complete
timeout := 3000
for (getEPINTFLAG(0) & sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) == 0 {
timeout--
if timeout == 0 {
return true
}
}
// last, set the device address to that requested by host
sam.USB_DEVICE.DADD.SetBits(setup.wValueL)
sam.USB_DEVICE.DADD.SetBits(sam.USB_DEVICE_DADD_ADDEN)
return true
case usb_GET_DESCRIPTOR:
sendDescriptor(setup)
return true
case usb_SET_DESCRIPTOR:
return false
case usb_GET_CONFIGURATION:
buff := []byte{usbConfiguration}
sendUSBPacket(0, buff, setup.wLength)
return true
case usb_SET_CONFIGURATION:
if setup.bmRequestType&usb_REQUEST_RECIPIENT == usb_REQUEST_DEVICE {
for i := 1; i < len(endPoints); i++ {
initEndpoint(uint32(i), endPoints[i])
}
usbConfiguration = setup.wValueL
// Enable interrupt for CDC control messages from host (OUT packet)
setEPINTENSET(usb_CDC_ENDPOINT_ACM, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT1)
// Enable interrupt for CDC data messages from host
setEPINTENSET(usb_CDC_ENDPOINT_OUT, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT0)
// Enable interrupt for HID messages from host
if hidCallback != nil {
setEPINTENSET(usb_HID_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT1)
}
sendZlp()
return true
} else {
return false
}
case usb_GET_INTERFACE:
buff := []byte{usbSetInterface}
sendUSBPacket(0, buff, setup.wLength)
return true
case usb_SET_INTERFACE:
usbSetInterface = setup.wValueL
sendZlp()
return true
default:
return true
}
}
func cdcSetup(setup usbSetup) bool {
if setup.bmRequestType == usb_REQUEST_DEVICETOHOST_CLASS_INTERFACE {
if setup.bRequest == usb_CDC_GET_LINE_CODING {
var b [cdcLineInfoSize]byte
b[0] = byte(usbLineInfo.dwDTERate)
b[1] = byte(usbLineInfo.dwDTERate >> 8)
b[2] = byte(usbLineInfo.dwDTERate >> 16)
b[3] = byte(usbLineInfo.dwDTERate >> 24)
b[4] = byte(usbLineInfo.bCharFormat)
b[5] = byte(usbLineInfo.bParityType)
b[6] = byte(usbLineInfo.bDataBits)
sendUSBPacket(0, b[:], setup.wLength)
return true
}
}
if setup.bmRequestType == usb_REQUEST_HOSTTODEVICE_CLASS_INTERFACE {
if setup.bRequest == usb_CDC_SET_LINE_CODING {
b, err := receiveUSBControlPacket()
if err != nil {
return false
}
usbLineInfo.dwDTERate = uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
usbLineInfo.bCharFormat = b[4]
usbLineInfo.bParityType = b[5]
usbLineInfo.bDataBits = b[6]
}
if setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
usbLineInfo.lineState = setup.wValueL
}
if setup.bRequest == usb_CDC_SET_LINE_CODING || setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
// auto-reset into the bootloader
if usbLineInfo.dwDTERate == 1200 && usbLineInfo.lineState&usb_CDC_LINESTATE_DTR == 0 {
ResetProcessor()
} else {
// TODO: cancel any reset
}
sendZlp()
}
if setup.bRequest == usb_CDC_SEND_BREAK {
// TODO: something with this value?
// breakValue = ((uint16_t)setup.wValueH << 8) | setup.wValueL;
// return false;
sendZlp()
}
return true
}
return false
}
// SendUSBHIDPacket sends a packet for USBHID (interrupt / in).
func SendUSBHIDPacket(ep uint32, data []byte) bool {
if waitHidTxc {
return false
}
sendUSBPacket(ep, data, 0)
// clear transfer complete flag
setEPINTFLAG(ep, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
// send data by setting bank ready
setEPSTATUSSET(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
waitHidTxc = true
return true
}
//go:noinline
func sendUSBPacket(ep uint32, data []byte, maxsize uint16) {
l := uint16(len(data))
if 0 < maxsize && maxsize < l {
l = maxsize
}
copy(udd_ep_in_cache_buffer[ep][:], data[:l])
// Set endpoint address for sending data
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
// clear multi-packet size which is total bytes already sent
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set byte count, which is total number of bytes to be sent
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits((uint32(l) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
}
func receiveUSBControlPacket() ([cdcLineInfoSize]byte, error) {
var b [cdcLineInfoSize]byte
// address
usbEndpointDescriptors[0].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[0]))))
// set byte count to zero
usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// set ready for next data
setEPSTATUSCLR(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
// Wait until OUT transfer is ready.
timeout := 300000
for (getEPSTATUS(0) & sam.USB_DEVICE_ENDPOINT_EPSTATUS_BK0RDY) == 0 {
timeout--
if timeout == 0 {
return b, errUSBCDCReadTimeout
}
}
// Wait until OUT transfer is completed.
timeout = 300000
for (getEPINTFLAG(0) & sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) == 0 {
timeout--
if timeout == 0 {
return b, errUSBCDCReadTimeout
}
}
// get data
bytesread := uint32((usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.Get() >>
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
if bytesread != cdcLineInfoSize {
return b, errUSBCDCBytesRead
}
copy(b[:7], udd_ep_out_cache_buffer[0][:7])
return b, nil
}
func handleEndpoint(ep uint32) {
// get data
count := int((usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.Get() >>
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
// move to ring buffer
for i := 0; i < count; i++ {
USB.Receive(byte((udd_ep_out_cache_buffer[ep][i] & 0xFF)))
}
// set byte count to zero
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
// set multi packet size to 64
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
// set ready for next data
setEPSTATUSCLR(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
}
func sendZlp() {
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
}
func epPacketSize(size uint16) uint32 {
switch size {
case 8:
return 0
case 16:
return 1
case 32:
return 2
case 64:
return 3
case 128:
return 4
case 256:
return 5
case 512:
return 6
case 1023:
return 7
default:
return 0
}
}
func getEPCFG(ep uint32) uint8 {
return sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPCFG.Get()
}
func setEPCFG(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPCFG.Set(val)
}
func setEPSTATUSCLR(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPSTATUSCLR.Set(val)
}
func setEPSTATUSSET(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPSTATUSSET.Set(val)
}
func getEPSTATUS(ep uint32) uint8 {
return sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPSTATUS.Get()
}
func getEPINTFLAG(ep uint32) uint8 {
return sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPINTFLAG.Get()
}
func setEPINTFLAG(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPINTFLAG.Set(val)
}
func setEPINTENCLR(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPINTENCLR.Set(val)
}
func setEPINTENSET(ep uint32, val uint8) {
sam.USB_DEVICE.DEVICE_ENDPOINT[ep].EPINTENSET.Set(val)
}