769 строки
23 КиБ
Go
769 строки
23 КиБ
Go
//go:build (sam && atsamd51) || (sam && atsame5x)
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// +build sam,atsamd51 sam,atsame5x
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// Peripheral abstraction layer for the atsamd51.
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//
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// Datasheet:
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// http://ww1.microchip.com/downloads/en/DeviceDoc/60001507C.pdf
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//
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package machine
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import (
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"device/sam"
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"runtime/interrupt"
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"runtime/volatile"
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"unsafe"
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)
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// USBCDC is the USB CDC aka serial over USB interface on the SAMD21.
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type USBCDC struct {
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Buffer *RingBuffer
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TxIdx volatile.Register8
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waitTxc bool
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waitTxcRetryCount uint8
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sent bool
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configured bool
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}
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var (
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// USB is a USB CDC interface.
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USB = &USBCDC{Buffer: NewRingBuffer()}
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waitHidTxc bool
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)
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const (
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usbcdcTxSizeMask uint8 = 0x3F
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usbcdcTxBankMask uint8 = ^usbcdcTxSizeMask
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usbcdcTxBank1st uint8 = 0x00
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usbcdcTxBank2nd uint8 = usbcdcTxSizeMask + 1
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usbcdcTxMaxRetriesAllowed uint8 = 5
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)
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// Flush flushes buffered data.
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func (usbcdc *USBCDC) Flush() error {
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if usbLineInfo.lineState > 0 {
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idx := usbcdc.TxIdx.Get()
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sz := idx & usbcdcTxSizeMask
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bk := idx & usbcdcTxBankMask
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if 0 < sz {
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if usbcdc.waitTxc {
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// waiting for the next flush(), because the transmission is not complete
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usbcdc.waitTxcRetryCount++
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return nil
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}
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usbcdc.waitTxc = true
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usbcdc.waitTxcRetryCount = 0
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// set the data
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usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][bk]))))
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if bk == usbcdcTxBank1st {
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usbcdc.TxIdx.Set(usbcdcTxBank2nd)
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} else {
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usbcdc.TxIdx.Set(usbcdcTxBank1st)
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}
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// clean multi packet size of bytes already sent
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usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
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// set count of bytes to be sent
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usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
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usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE.SetBits((uint32(sz) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
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// clear transfer complete flag
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setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
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// send data by setting bank ready
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setEPSTATUSSET(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
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usbcdc.sent = true
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}
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}
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return nil
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}
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// WriteByte writes a byte of data to the USB CDC interface.
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func (usbcdc *USBCDC) WriteByte(c byte) error {
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// Supposedly to handle problem with Windows USB serial ports?
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if usbLineInfo.lineState > 0 {
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ok := false
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for {
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mask := interrupt.Disable()
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idx := usbcdc.TxIdx.Get()
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if (idx & usbcdcTxSizeMask) < usbcdcTxSizeMask {
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udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][idx] = c
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usbcdc.TxIdx.Set(idx + 1)
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ok = true
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}
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interrupt.Restore(mask)
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if ok {
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break
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} else if usbcdcTxMaxRetriesAllowed < usbcdc.waitTxcRetryCount {
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mask := interrupt.Disable()
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usbcdc.waitTxc = false
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usbcdc.waitTxcRetryCount = 0
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usbcdc.TxIdx.Set(0)
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usbLineInfo.lineState = 0
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interrupt.Restore(mask)
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break
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} else {
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mask := interrupt.Disable()
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if usbcdc.sent {
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if usbcdc.waitTxc {
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if (getEPINTFLAG(usb_CDC_ENDPOINT_IN) & sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) != 0 {
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setEPSTATUSCLR(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
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setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
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usbcdc.waitTxc = false
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usbcdc.Flush()
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}
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} else {
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usbcdc.Flush()
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}
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}
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interrupt.Restore(mask)
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}
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}
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}
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return nil
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}
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func (usbcdc *USBCDC) DTR() bool {
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return (usbLineInfo.lineState & usb_CDC_LINESTATE_DTR) > 0
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}
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func (usbcdc *USBCDC) RTS() bool {
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return (usbLineInfo.lineState & usb_CDC_LINESTATE_RTS) > 0
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}
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const (
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// these are SAMD51 specific.
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usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos = 0
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usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask = 0x3FFF
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usb_DEVICE_PCKSIZE_SIZE_Pos = 28
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usb_DEVICE_PCKSIZE_SIZE_Mask = 0x7
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usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos = 14
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usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask = 0x3FFF
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)
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var (
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usbEndpointDescriptors [8]usbDeviceDescriptor
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udd_ep_in_cache_buffer [7][128]uint8
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udd_ep_out_cache_buffer [7][128]uint8
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isEndpointHalt = false
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isRemoteWakeUpEnabled = false
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endPoints = []uint32{usb_ENDPOINT_TYPE_CONTROL,
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(usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn),
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(usb_ENDPOINT_TYPE_BULK | usbEndpointOut),
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(usb_ENDPOINT_TYPE_BULK | usbEndpointIn)}
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usbConfiguration uint8
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usbSetInterface uint8
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usbLineInfo = cdcLineInfo{115200, 0x00, 0x00, 0x08, 0x00}
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)
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// Configure the USB CDC interface. The config is here for compatibility with the UART interface.
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func (usbcdc *USBCDC) Configure(config UARTConfig) {
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// reset USB interface
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sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_SWRST)
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for sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_SWRST) ||
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sam.USB_DEVICE.SYNCBUSY.HasBits(sam.USB_DEVICE_SYNCBUSY_ENABLE) {
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}
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sam.USB_DEVICE.DESCADD.Set(uint32(uintptr(unsafe.Pointer(&usbEndpointDescriptors))))
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// configure pins
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USBCDC_DM_PIN.Configure(PinConfig{Mode: PinCom})
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USBCDC_DP_PIN.Configure(PinConfig{Mode: PinCom})
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// performs pad calibration from store fuses
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handlePadCalibration()
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// run in standby
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sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_RUNSTDBY)
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// set full speed
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sam.USB_DEVICE.CTRLB.SetBits(sam.USB_DEVICE_CTRLB_SPDCONF_FS << sam.USB_DEVICE_CTRLB_SPDCONF_Pos)
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// attach
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sam.USB_DEVICE.CTRLB.ClearBits(sam.USB_DEVICE_CTRLB_DETACH)
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// enable interrupt for end of reset
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sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_EORST)
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// enable interrupt for start of frame
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sam.USB_DEVICE.INTENSET.SetBits(sam.USB_DEVICE_INTENSET_SOF)
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// enable USB
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sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_ENABLE)
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// enable IRQ at highest priority
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interrupt.New(sam.IRQ_USB_OTHER, handleUSBIRQ).Enable()
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interrupt.New(sam.IRQ_USB_SOF_HSOF, handleUSBIRQ).Enable()
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interrupt.New(sam.IRQ_USB_TRCPT0, handleUSBIRQ).Enable()
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interrupt.New(sam.IRQ_USB_TRCPT1, handleUSBIRQ).Enable()
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usbcdc.configured = true
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}
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// Configured returns whether usbcdc is configured or not.
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func (usbcdc *USBCDC) Configured() bool {
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return usbcdc.configured
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}
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func handlePadCalibration() {
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// Load Pad Calibration data from non-volatile memory
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// This requires registers that are not included in the SVD file.
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// Modeled after defines from samd21g18a.h and nvmctrl.h:
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//
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// #define NVMCTRL_OTP4 0x00806020
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//
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// #define USB_FUSES_TRANSN_ADDR (NVMCTRL_OTP4 + 4)
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// #define USB_FUSES_TRANSN_Pos 13 /**< \brief (NVMCTRL_OTP4) USB pad Transn calibration */
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// #define USB_FUSES_TRANSN_Msk (0x1Fu << USB_FUSES_TRANSN_Pos)
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// #define USB_FUSES_TRANSN(value) ((USB_FUSES_TRANSN_Msk & ((value) << USB_FUSES_TRANSN_Pos)))
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// #define USB_FUSES_TRANSP_ADDR (NVMCTRL_OTP4 + 4)
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// #define USB_FUSES_TRANSP_Pos 18 /**< \brief (NVMCTRL_OTP4) USB pad Transp calibration */
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// #define USB_FUSES_TRANSP_Msk (0x1Fu << USB_FUSES_TRANSP_Pos)
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// #define USB_FUSES_TRANSP(value) ((USB_FUSES_TRANSP_Msk & ((value) << USB_FUSES_TRANSP_Pos)))
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// #define USB_FUSES_TRIM_ADDR (NVMCTRL_OTP4 + 4)
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// #define USB_FUSES_TRIM_Pos 23 /**< \brief (NVMCTRL_OTP4) USB pad Trim calibration */
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// #define USB_FUSES_TRIM_Msk (0x7u << USB_FUSES_TRIM_Pos)
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// #define USB_FUSES_TRIM(value) ((USB_FUSES_TRIM_Msk & ((value) << USB_FUSES_TRIM_Pos)))
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//
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fuse := *(*uint32)(unsafe.Pointer(uintptr(0x00806020) + 4))
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calibTransN := uint16(fuse>>13) & uint16(0x1f)
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calibTransP := uint16(fuse>>18) & uint16(0x1f)
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calibTrim := uint16(fuse>>23) & uint16(0x7)
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if calibTransN == 0x1f {
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calibTransN = 5
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}
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sam.USB_DEVICE.PADCAL.SetBits(calibTransN << sam.USB_DEVICE_PADCAL_TRANSN_Pos)
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if calibTransP == 0x1f {
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calibTransP = 29
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}
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sam.USB_DEVICE.PADCAL.SetBits(calibTransP << sam.USB_DEVICE_PADCAL_TRANSP_Pos)
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if calibTrim == 0x7 {
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calibTrim = 3
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}
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sam.USB_DEVICE.PADCAL.SetBits(calibTrim << sam.USB_DEVICE_PADCAL_TRIM_Pos)
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}
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func handleUSBIRQ(interrupt.Interrupt) {
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// reset all interrupt flags
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flags := sam.USB_DEVICE.INTFLAG.Get()
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sam.USB_DEVICE.INTFLAG.Set(flags)
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// End of reset
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if (flags & sam.USB_DEVICE_INTFLAG_EORST) > 0 {
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// Configure control endpoint
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initEndpoint(0, usb_ENDPOINT_TYPE_CONTROL)
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// Enable Setup-Received interrupt
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setEPINTENSET(0, sam.USB_DEVICE_ENDPOINT_EPINTENSET_RXSTP)
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usbConfiguration = 0
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// ack the End-Of-Reset interrupt
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sam.USB_DEVICE.INTFLAG.Set(sam.USB_DEVICE_INTFLAG_EORST)
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}
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// Start of frame
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if (flags & sam.USB_DEVICE_INTFLAG_SOF) > 0 {
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USB.Flush()
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if hidCallback != nil && !waitHidTxc {
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hidCallback()
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}
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// if you want to blink LED showing traffic, this would be the place...
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}
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// Endpoint 0 Setup interrupt
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if getEPINTFLAG(0)&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_RXSTP > 0 {
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// ack setup received
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setEPINTFLAG(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_RXSTP)
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// parse setup
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setup := newUSBSetup(udd_ep_out_cache_buffer[0][:])
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// Clear the Bank 0 ready flag on Control OUT
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setEPSTATUSCLR(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
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usbEndpointDescriptors[0].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
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ok := false
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if (setup.bmRequestType & usb_REQUEST_TYPE) == usb_REQUEST_STANDARD {
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// Standard Requests
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ok = handleStandardSetup(setup)
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} else {
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// Class Interface Requests
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if setup.wIndex == usb_CDC_ACM_INTERFACE {
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ok = cdcSetup(setup)
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} else if setup.bmRequestType == usb_SET_REPORT_TYPE && setup.bRequest == usb_SET_IDLE {
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sendZlp()
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ok = true
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}
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}
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if ok {
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// set Bank1 ready
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setEPSTATUSSET(0, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK1RDY)
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} else {
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// Stall endpoint
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setEPSTATUSSET(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1)
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}
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if getEPINTFLAG(0)&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1 > 0 {
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// ack the stall
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setEPINTFLAG(0, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_STALL1)
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// clear stall request
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setEPINTENCLR(0, sam.USB_DEVICE_ENDPOINT_EPINTENCLR_STALL1)
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}
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}
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// Now the actual transfer handlers, ignore endpoint number 0 (setup)
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var i uint32
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for i = 1; i < uint32(len(endPoints)); i++ {
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// Check if endpoint has a pending interrupt
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epFlags := getEPINTFLAG(i)
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if (epFlags&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT0) > 0 ||
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(epFlags&sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) > 0 {
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switch i {
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case usb_CDC_ENDPOINT_OUT:
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handleEndpoint(i)
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setEPINTFLAG(i, epFlags)
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case usb_CDC_ENDPOINT_IN, usb_CDC_ENDPOINT_ACM:
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setEPSTATUSCLR(i, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
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setEPINTFLAG(i, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
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if i == usb_CDC_ENDPOINT_IN {
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USB.waitTxc = false
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}
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case usb_HID_ENDPOINT_IN:
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setEPINTFLAG(i, sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1)
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waitHidTxc = false
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}
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}
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}
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}
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func initEndpoint(ep, config uint32) {
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switch config {
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case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn:
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
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// set endpoint type
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setEPCFG(ep, ((usb_ENDPOINT_TYPE_INTERRUPT + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
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case usb_ENDPOINT_TYPE_BULK | usbEndpointOut:
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
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// set endpoint type
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setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE0_Pos))
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// receive interrupts when current transfer complete
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setEPINTENSET(ep, sam.USB_DEVICE_ENDPOINT_EPINTENSET_TRCPT0)
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// set byte count to zero, we have not received anything yet
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
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// ready for next transfer
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setEPSTATUSCLR(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK0RDY)
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case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointOut:
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// TODO: not really anything, seems like...
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case usb_ENDPOINT_TYPE_BULK | usbEndpointIn:
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
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// set endpoint type
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setEPCFG(ep, ((usb_ENDPOINT_TYPE_BULK + 1) << sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
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// NAK on endpoint IN, the bank is not yet filled in.
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setEPSTATUSCLR(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSCLR_BK1RDY)
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case usb_ENDPOINT_TYPE_CONTROL:
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// Control OUT
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep]))))
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// set endpoint type
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setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE0_Pos))
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// Control IN
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE.SetBits(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR.Set(uint32(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep]))))
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// set endpoint type
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setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_ENDPOINT_EPCFG_EPTYPE1_Pos))
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// Prepare OUT endpoint for receive
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// set multi packet size for expected number of receive bytes on control OUT
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.SetBits(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
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// set byte count to zero, we have not received anything yet
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE.ClearBits(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
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// NAK on endpoint OUT to show we are ready to receive control data
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setEPSTATUSSET(ep, sam.USB_DEVICE_ENDPOINT_EPSTATUSSET_BK0RDY)
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}
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}
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|
|
|
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 {
|
|
EnterBootloader()
|
|
} 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)
|
|
}
|