stm32: separate altfunc selection for UART Tx/Rx

This is needed for stm32l432 nucleo with different altfun for tx and rx

src/machine/board_feather-stm32f405.go

@@ -122,17 +122,20 @@ var (
 	UART1 = UART{
 		Buffer:            NewRingBuffer(),
 		Bus:               stm32.USART3,
-		AltFuncSelector: AF7_USART1_2_3,
+		TxAltFuncSelector: AF7_USART1_2_3,
+		RxAltFuncSelector: AF7_USART1_2_3,
 	}
 	UART2 = UART{
 		Buffer:            NewRingBuffer(),
 		Bus:               stm32.USART6,
-		AltFuncSelector: AF8_USART4_5_6,
+		TxAltFuncSelector: AF8_USART4_5_6,
+		RxAltFuncSelector: AF8_USART4_5_6,
 	}
 	UART3 = UART{
 		Buffer:            NewRingBuffer(),
 		Bus:               stm32.USART1,
-		AltFuncSelector: AF7_USART1_2_3,
+		TxAltFuncSelector: AF7_USART1_2_3,
+		RxAltFuncSelector: AF7_USART1_2_3,
 	}
 	UART0 = UART1
 )

src/machine/board_nucleof722ze.go

@@ -35,7 +35,8 @@ var (
 	UART0 = UART{
 		Buffer:            NewRingBuffer(),
 		Bus:               stm32.USART3,
-		AltFuncSelector: UART_ALT_FN,
+		TxAltFuncSelector: UART_ALT_FN,
+		RxAltFuncSelector: UART_ALT_FN,
 	}
 	UART1 = &UART0
 )

src/machine/board_nucleol552ze.go

@@ -35,7 +35,8 @@ var (
 	UART0 = UART{
 		Buffer:            NewRingBuffer(),
 		Bus:               stm32.LPUART1,
-		AltFuncSelector: UART_ALT_FN,
+		TxAltFuncSelector: UART_ALT_FN,
+		RxAltFuncSelector: UART_ALT_FN,
 	}
 	UART1 = &UART0
 )

src/machine/board_stm32f4disco.go

@@ -30,7 +30,8 @@ var (
 	UART0 = UART{
 		Buffer:            NewRingBuffer(),
 		Bus:               stm32.USART2,
-		AltFuncSelector: AF7_USART1_2_3,
+		TxAltFuncSelector: AF7_USART1_2_3,
+		RxAltFuncSelector: AF7_USART1_2_3,
 	}
 	UART1 = &UART0
 )

src/machine/machine_stm32_uart.go

@@ -16,7 +16,8 @@ type UART struct {
 	Buffer            *RingBuffer
 	Bus               *stm32.USART_Type
 	Interrupt         interrupt.Interrupt
-	AltFuncSelector uint8
+	TxAltFuncSelector uint8
+	RxAltFuncSelector uint8
 
 	// Registers specific to the chip
 	rxReg       *volatile.Register32

src/machine/machine_stm32f405.go

@@ -37,8 +37,8 @@ const (
 
 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)
+	config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)
+	config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)
 }
 
 func (uart *UART) getBaudRateDivisor(baudRate uint32) uint32 {

src/machine/machine_stm32f407.go

@@ -37,8 +37,8 @@ const (
 // Configure the UART.
 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)
+	config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)
+	config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)
 }
 
 // UART baudrate calc based on the bus and clockspeed

src/machine/machine_stm32f7x2.go

@@ -17,8 +17,8 @@ func CPUFrequency() uint32 {
 // Configure the UART.
 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)
+	config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)
+	config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)
 }
 
 // UART baudrate calc based on the bus and clockspeed

src/machine/machine_stm32l5x2.go

@@ -22,8 +22,8 @@ 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)
+	config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)
+	config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)
 }
 
 // UART baudrate calc based on the bus and clockspeed