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add basic UART handler

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This commit is contained in:
ardnew
2020-08-29 14:32:24 -05:00
committed by Ron Evans
parent 19d5e05e37
commit a9a6d0ee63
3 changed files with 79 additions and 25 deletions
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src/machine/machine_stm32f405.go
+16 -2
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@@ -22,8 +22,22 @@ type UART struct {
AltFuncSelector stm32.AltFunc
}
func (uart UART) configurePins(config UARTConfig) {}
func (uart UART) getBaudRateDivisor(baudRate uint32) uint32 { return 0 }
func (uart UART) configurePins(config UARTConfig) {
// enable the alternate functions on the TX and RX pins
config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.AltFuncSelector)
config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.AltFuncSelector)
}
func (uart UART) getBaudRateDivisor(baudRate uint32) uint32 {
var clock uint32
switch uart.Bus {
case stm32.USART1, stm32.USART6:
clock = CPUFrequency() / 2 // APB2 Frequency
case stm32.USART2, stm32.USART3, stm32.UART4, stm32.UART5:
clock = CPUFrequency() / 4 // APB1 Frequency
}
return clock / baudRate
}
// -- SPI ----------------------------------------------------------------------