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stm32f4: refactor GPIO, in prep for adding SPI, I2C, PWM etc

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This commit is contained in:
gwtnz
2020-03-07 08:34:42 -06:00
committed by GitHub
parent 3aaa029c70
commit c8a4994feb
6 changed files with 306 additions and 145 deletions
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src/machine/machine_stm32f103xx.go
+34 -40
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@@ -8,6 +8,7 @@ import (
"device/stm32"
"errors"
"runtime/interrupt"
"unsafe"
)
func CPUFrequency() uint32 {
@@ -32,6 +33,20 @@ const (
PinOutputModeAltOpenDrain PinMode = 12 // Output mode alt. purpose open drain
)
// Configure this pin with the given I/O settings.
// stm32f1xx uses different technique for setting the GPIO pins than the stm32f407
func (p Pin) Configure(config PinConfig) {
// Configure the GPIO pin.
port := p.getPort()
pin := uint8(p) % 16
pos := (pin % 8) * 4
if pin < 8 {
port.CRL.ReplaceBits(uint32(config.Mode), 0xf, pos)
} else {
port.CRH.ReplaceBits(uint32(config.Mode), 0xf, pos)
}
}
func (p Pin) getPort() *stm32.GPIO_Type {
switch p / 16 {
case 0:
@@ -75,40 +90,19 @@ func (p Pin) enableClock() {
}
}
// Configure this pin with the given configuration.
func (p Pin) Configure(config PinConfig) {
// Configure the GPIO pin.
p.enableClock()
port := p.getPort()
pin := uint8(p) % 16
pos := uint8(p) % 8 * 4
if pin < 8 {
port.CRL.Set((uint32(port.CRL.Get()) &^ (0xf << pos)) | (uint32(config.Mode) << pos))
} else {
port.CRH.Set((uint32(port.CRH.Get()) &^ (0xf << pos)) | (uint32(config.Mode) << pos))
// Enable peripheral clock. Expand to include all the desired peripherals
func enableAltFuncClock(bus unsafe.Pointer) {
if bus == unsafe.Pointer(stm32.USART1) {
stm32.RCC.APB2ENR.SetBits(stm32.RCC_APB2ENR_USART1EN)
} else if bus == unsafe.Pointer(stm32.USART2) {
stm32.RCC.APB1ENR.SetBits(stm32.RCC_APB1ENR_USART2EN)
} else if bus == unsafe.Pointer(stm32.I2C1) {
stm32.RCC.APB1ENR.SetBits(stm32.RCC_APB1ENR_I2C1EN)
} else if bus == unsafe.Pointer(stm32.SPI1) {
stm32.RCC.APB2ENR.SetBits(stm32.RCC_APB2ENR_SPI1EN)
}
}
// Set the pin to high or low.
// Warning: only use this on an output pin!
func (p Pin) Set(high bool) {
port := p.getPort()
pin := uint8(p) % 16
if high {
port.BSRR.Set(1 << pin)
} else {
port.BSRR.Set(1 << (pin + 16))
}
}
// Get returns the current value of a GPIO pin.
func (p Pin) Get() bool {
port := p.getPort()
pin := uint8(p) % 16
val := port.IDR.Get() & (1 << pin)
return (val > 0)
}
// UART
type UART struct {
Buffer *RingBuffer
@@ -123,6 +117,12 @@ func (uart UART) Configure(config UARTConfig) {
config.BaudRate = 115200
}
// Set the GPIO pins to defaults if they're not set
if config.TX == 0 && config.RX == 0 {
config.TX = UART_TX_PIN
config.RX = UART_RX_PIN
}
// pins
switch config.TX {
case UART_ALT_TX_PIN:
@@ -133,20 +133,14 @@ func (uart UART) Configure(config UARTConfig) {
} else if uart.Bus == stm32.USART2 {
stm32.AFIO.MAPR.SetBits(stm32.AFIO_MAPR_USART2_REMAP)
}
UART_ALT_TX_PIN.Configure(PinConfig{Mode: PinOutput50MHz + PinOutputModeAltPushPull})
UART_ALT_RX_PIN.Configure(PinConfig{Mode: PinInputModeFloating})
default:
// use standard TX/RX pins PA9 and PA10
UART_TX_PIN.Configure(PinConfig{Mode: PinOutput50MHz + PinOutputModeAltPushPull})
UART_RX_PIN.Configure(PinConfig{Mode: PinInputModeFloating})
}
config.TX.Configure(PinConfig{Mode: PinOutput50MHz + PinOutputModeAltPushPull})
config.RX.Configure(PinConfig{Mode: PinInputModeFloating})
// Enable USART clock
if uart.Bus == stm32.USART1 {
stm32.RCC.APB2ENR.SetBits(stm32.RCC_APB2ENR_USART1EN)
} else if uart.Bus == stm32.USART2 {
stm32.RCC.APB1ENR.SetBits(stm32.RCC_APB1ENR_USART2EN)
}
enableAltFuncClock(unsafe.Pointer(uart.Bus))
// Set baud rate
uart.SetBaudRate(config.BaudRate)