machine/stm32: add support for stm32f103xx UART
Signed-off-by: Ron Evans <ron@hybridgroup.com>
Этот коммит содержится в:
Ron Evans
Ayke van Laethem
родитель
a830451426
коммит
47b667a4b8
6 изменённых файлов: 264 добавлений и 82 удалений
44
src/device/stm32/stm32f103xx-bitfields.go
Обычный файл
44
src/device/stm32/stm32f103xx-bitfields.go
Обычный файл
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@ -0,0 +1,44 @@
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// Hand created file. DO NOT DELETE.
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// STM32F103XX bitfield definitions that are not auto-generated by gen-device-svd.py
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// +build stm32,stm32f103xx
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package stm32
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const (
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// Flash Access Control Register flag values.
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FLASH_ACR_LATENCY_0 = 0x00000001
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FLASH_ACR_LATENCY_1 = 0x00000002
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FLASH_ACR_LATENCY_2 = 0x00000004
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// Reset and Clock Control Control Register flag values.
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RCC_CFGR_SW_HSI = 0
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RCC_CFGR_SW_HSE = 1
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RCC_CFGR_SW_PLL = 2
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RCC_CFGR_SWS_HSI = 0x00000000
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RCC_CFGR_SWS_HSE = 0x00000004
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RCC_CFGR_SWS_PLL = 0x00000008
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RCC_CFGR_PPRE1_DIV_NONE = 0x00000000
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RCC_CFGR_PPRE1_DIV_2 = 0x00000400
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RCC_CFGR_PPRE1_DIV_4 = 0x00000500
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RCC_CFGR_PPRE1_DIV_8 = 0x00000600
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RCC_CFGR_PPRE1_DIV_16 = 0x00000700
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RCC_CFGR_PLLMUL_2 = 0x00000000
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RCC_CFGR_PLLMUL_3 = 0x00040000
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RCC_CFGR_PLLMUL_4 = 0x00080000
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RCC_CFGR_PLLMUL_5 = 0x000C0000
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RCC_CFGR_PLLMUL_6 = 0x00100000
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RCC_CFGR_PLLMUL_7 = 0x00140000
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RCC_CFGR_PLLMUL_8 = 0x00180000
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RCC_CFGR_PLLMUL_9 = 0x001C0000
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RCC_CFGR_PLLMUL_10 = 0x00200000
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RCC_CFGR_PLLMUL_11 = 0x00240000
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RCC_CFGR_PLLMUL_12 = 0x00280000
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RCC_CFGR_PLLMUL_13 = 0x002C0000
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RCC_CFGR_PLLMUL_14 = 0x00300000
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RCC_CFGR_PLLMUL_15 = 0x00340000
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RCC_CFGR_PLLMUL_16 = 0x00380000
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)
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@ -4,17 +4,8 @@ package machine
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// Peripheral abstraction layer for the stm32.
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import (
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"device/stm32"
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)
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type GPIOMode uint8
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const (
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GPIO_INPUT = 0 // Input mode
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GPIO_OUTPUT = 2 // Output mode, max speed 2MHz
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)
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const (
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portA = iota * 16
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portB
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@ -24,54 +15,3 @@ const (
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portF
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portG
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)
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func (p GPIO) getPort() *stm32.GPIO_Type {
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switch p.Pin / 16 {
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case 0:
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return stm32.GPIOA
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case 1:
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return stm32.GPIOB
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case 2:
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return stm32.GPIOC
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case 3:
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return stm32.GPIOD
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case 4:
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return stm32.GPIOE
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case 5:
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return stm32.GPIOF
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case 6:
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return stm32.GPIOG
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default:
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panic("machine: unknown port")
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}
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}
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// Configure this pin with the given configuration.
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func (p GPIO) Configure(config GPIOConfig) {
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// Enable clock.
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// Do this always, as it isn't known whether the clock has already been
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// enabled.
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_IOPCEN
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// Configure the GPIO pin.
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port := p.getPort()
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pin := p.Pin % 16
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pos := p.Pin % 8 * 4
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if pin < 8 {
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port.CRL = stm32.RegValue((uint32(port.CRL) &^ (0xf << pos)) | (uint32(config.Mode) << pos))
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} else {
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port.CRH = stm32.RegValue((uint32(port.CRH) &^ (0xf << pos)) | (uint32(config.Mode) << pos))
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}
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}
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// Set the pin to high or low.
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// Warning: only use this on an output pin!
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func (p GPIO) Set(high bool) {
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port := p.getPort()
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pin := p.Pin % 16
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if high {
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port.BSRR = 1 << pin
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} else {
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port.BSRR = 1 << (pin + 16)
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}
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}
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161
src/machine/machine_stm32f103xx.go
Обычный файл
161
src/machine/machine_stm32f103xx.go
Обычный файл
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@ -0,0 +1,161 @@
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// +build stm32,stm32f103xx
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package machine
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// Peripheral abstraction layer for the stm32.
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import (
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"device/arm"
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"device/stm32"
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)
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const CPU_FREQUENCY = 72000000
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const (
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GPIO_INPUT = 0 // Input mode
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GPIO_OUTPUT_10MHz = 1 // Output mode, max speed 10MHz
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GPIO_OUTPUT_2MHz = 2 // Output mode, max speed 2MHz
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GPIO_OUTPUT_50MHz = 3 // Output mode, max speed 50MHz
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GPIO_OUTPUT = GPIO_OUTPUT_2MHz
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GPIO_INPUT_MODE_ANALOG = 0 // Input analog mode
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GPIO_INPUT_MODE_FLOATING = 4 // Input floating mode
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GPIO_INPUT_MODE_PULL_UP_DOWN = 8 // Input pull up/down mode
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GPIO_INPUT_MODE_RESERVED = 12 // Input mode (reserved)
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GPIO_OUTPUT_MODE_GP_PUSH_PULL = 0 // Output mode general purpose push/pull
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GPIO_OUTPUT_MODE_GP_OPEN_DRAIN = 4 // Output mode general purpose open drain
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GPIO_OUTPUT_MODE_ALT_PUSH_PULL = 8 // Output mode alt. purpose push/pull
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GPIO_OUTPUT_MODE_ALT_OPEN_DRAIN = 12 // Output mode alt. purpose open drain
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)
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func (p GPIO) getPort() *stm32.GPIO_Type {
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switch p.Pin / 16 {
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case 0:
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return stm32.GPIOA
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case 1:
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return stm32.GPIOB
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case 2:
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return stm32.GPIOC
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case 3:
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return stm32.GPIOD
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case 4:
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return stm32.GPIOE
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case 5:
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return stm32.GPIOF
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case 6:
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return stm32.GPIOG
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default:
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panic("machine: unknown port")
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}
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}
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// enableClock enables the clock for this desired GPIO port.
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func (p GPIO) enableClock() {
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switch p.Pin / 16 {
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case 0:
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_IOPAEN
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case 1:
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_IOPBEN
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case 2:
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_IOPCEN
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case 3:
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_IOPDEN
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case 4:
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_IOPEEN
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case 5:
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_IOPFEN
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case 6:
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_IOPGEN
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default:
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panic("machine: unknown port")
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}
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}
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// Configure this pin with the given configuration.
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func (p GPIO) Configure(config GPIOConfig) {
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// Configure the GPIO pin.
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p.enableClock()
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port := p.getPort()
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pin := p.Pin % 16
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pos := p.Pin % 8 * 4
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if pin < 8 {
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port.CRL = stm32.RegValue((uint32(port.CRL) &^ (0xf << pos)) | (uint32(config.Mode) << pos))
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} else {
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port.CRH = stm32.RegValue((uint32(port.CRH) &^ (0xf << pos)) | (uint32(config.Mode) << pos))
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}
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}
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// Set the pin to high or low.
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// Warning: only use this on an output pin!
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func (p GPIO) Set(high bool) {
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port := p.getPort()
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pin := p.Pin % 16
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if high {
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port.BSRR = 1 << pin
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} else {
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port.BSRR = 1 << (pin + 16)
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}
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}
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// UART
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var (
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// USART1 is the first hardware serial port on the STM32.
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// Both UART0 and UART1 refers to USART1.
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UART0 = &UART{}
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UART1 = UART0
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)
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// Configure the UART.
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func (uart UART) Configure(config UARTConfig) {
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// Default baud rate to 115200.
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if config.BaudRate == 0 {
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config.BaudRate = 115200
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}
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// pins
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switch config.TX {
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case PB6:
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// use alternate TX/RX pins PB6/PB7 via AFIO mapping
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_AFIOEN
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stm32.AFIO.MAPR |= stm32.AFIO_MAPR_USART1_REMAP
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GPIO{PB6}.Configure(GPIOConfig{Mode: GPIO_OUTPUT_50MHz + GPIO_OUTPUT_MODE_ALT_PUSH_PULL})
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GPIO{PB7}.Configure(GPIOConfig{Mode: GPIO_INPUT_MODE_FLOATING})
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default:
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// use standard TX/RX pins PA9 and PA10
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GPIO{PA9}.Configure(GPIOConfig{Mode: GPIO_OUTPUT_50MHz + GPIO_OUTPUT_MODE_ALT_PUSH_PULL})
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GPIO{PA10}.Configure(GPIOConfig{Mode: GPIO_INPUT_MODE_FLOATING})
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}
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// Enable USART1 clock
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stm32.RCC.APB2ENR |= stm32.RCC_APB2ENR_USART1EN
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// Set baud rate
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uart.SetBaudRate(config.BaudRate)
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// Enable USART1 port.
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stm32.USART1.CR1 = stm32.USART_CR1_TE | stm32.USART_CR1_RE | stm32.USART_CR1_RXNEIE | stm32.USART_CR1_UE
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// Enable RX IRQ.
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arm.EnableIRQ(stm32.IRQ_USART1)
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}
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// SetBaudRate sets the communication speed for the UART.
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func (uart UART) SetBaudRate(br uint32) {
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divider := CPU_FREQUENCY / br
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stm32.USART1.BRR = stm32.RegValue(divider)
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}
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// WriteByte writes a byte of data to the UART.
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func (uart UART) WriteByte(c byte) error {
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stm32.USART1.DR = stm32.RegValue(c)
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for (stm32.USART1.SR & stm32.USART_SR_TXE) == 0 {
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}
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return nil
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}
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//go:export USART1_IRQHandler
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func handleUART1() {
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bufferPut(byte((stm32.USART1.DR & 0xFF)))
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}
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@ -1,4 +1,4 @@
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// +build avr nrf
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// +build avr nrf stm32
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package machine
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@ -6,6 +6,8 @@ import "errors"
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type UARTConfig struct {
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BaudRate uint32
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TX uint8
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RX uint8
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}
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type UART struct {
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@ -2,14 +2,8 @@
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package runtime
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import (
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"device/arm"
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)
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type timeUnit int64
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const tickMicros = 1 // TODO
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//go:export Reset_Handler
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func main() {
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preinit()
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@ -17,18 +11,3 @@ func main() {
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mainWrapper()
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abort()
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}
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func putchar(c byte) {
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// TODO
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}
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func sleepTicks(d timeUnit) {
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// TODO: use a real timer here
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for i := 0; i < int(d/535); i++ {
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arm.Asm("")
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}
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}
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func ticks() timeUnit {
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return 0 // TODO
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}
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56
src/runtime/runtime_stm32f103xx.go
Обычный файл
56
src/runtime/runtime_stm32f103xx.go
Обычный файл
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@ -0,0 +1,56 @@
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// +build stm32,stm32f103xx
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package runtime
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import (
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"device/arm"
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"device/stm32"
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"machine"
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)
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const tickMicros = 1 // TODO
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func init() {
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initCLK()
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machine.UART0.Configure(machine.UARTConfig{})
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}
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func putchar(c byte) {
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machine.UART0.WriteByte(c)
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}
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// initCLK sets clock to 72MHz using HSE 8MHz crystal w/ PLL X 9 (8MHz x 9 = 72MHz).
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func initCLK() {
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stm32.FLASH.ACR |= stm32.FLASH_ACR_LATENCY_2 // Two wait states, per datasheet
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stm32.RCC.CFGR |= stm32.RCC_CFGR_PPRE1_DIV_2 // prescale AHB1 = HCLK/2
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stm32.RCC.CR |= stm32.RCC_CR_HSEON // enable HSE clock
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// wait for the HSEREADY flag
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for (stm32.RCC.CR & stm32.RCC_CR_HSERDY) == 0 {
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}
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stm32.RCC.CFGR |= stm32.RCC_CFGR_PLLSRC // set PLL source to HSE
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stm32.RCC.CFGR |= stm32.RCC_CFGR_PLLMUL_9 // multiply by 9
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stm32.RCC.CR |= stm32.RCC_CR_PLLON // enable the PLL
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// wait for the PLLRDY flag
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for (stm32.RCC.CR & stm32.RCC_CR_PLLRDY) == 0 {
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}
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stm32.RCC.CFGR |= stm32.RCC_CFGR_SW_PLL // set clock source to pll
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// wait for PLL to be CLK
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for (stm32.RCC.CFGR & stm32.RCC_CFGR_SWS_PLL) == 0 {
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}
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}
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func sleepTicks(d timeUnit) {
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// TODO: use a real timer here
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for i := 0; i < int(d/535); i++ {
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arm.Asm("")
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}
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}
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func ticks() timeUnit {
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return 0 // TODO
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}
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