tinygo-org/tinygo
1
0
Fork 0
mirror of https://github.com/tinygo-org/tinygo.git synced 2026-08-13 15:33:40 +00:00
Code Issues Packages Projects Releases 6 Wiki Activity

targets: correct pin mapping for Arduino UNO Q STM32 MCU

Browse Source 
Signed-off-by: deadprogram <ron@hybridgroup.com>

machine/stm32u585: fix PWR peripheral clock was never enabled

On STM32U5, PWR is on AHB3 and requires RCC.AHB3ENR.PWREN -
unlike some other STM32 families where PWR is always clocked.
Without this, all writes to PWR registers (including IO2SV for
VDDIO2) were silently dropped, so GPIOG pins could never drive.

Signed-off-by: deadprogram <ron@hybridgroup.com>

target: correct I2C pin mapping for Arduino UNO Q

Signed-off-by: deadprogram <ron@hybridgroup.com>
This commit is contained in:
deadprogram
2026-03-17 20:16:03 +01:00
parent 323b62b405
commit 60fb4b95fa
4 changed files with 96 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/machine/machine_stm32u585.go
+26 -1
View File
@@ -4,6 +4,7 @@ package machine
import (
"device/stm32"
"unsafe"
)
func CPUFrequency() uint32 {
@@ -20,8 +21,23 @@ const APB2_TIM_FREQ = 4e6 // 4MHz (MSI default)
// Configure the UART.
func (uart *UART) configurePins(config UARTConfig) {
if uart.isLPUART1() {
// LPUART1 is on APB3. Explicitly enable its peripheral clock.
stm32.RCC.APB3ENR.SetBits(stm32.RCC_APB3ENR_LPUART1EN)
_ = stm32.RCC.APB3ENR.Get() // delay for clock stabilization
// Select PCLK3 as LPUART1 kernel clock source.
stm32.RCC.CCIPR3.ReplaceBits(
stm32.RCC_CCIPR3_LPUART1SEL_PCLK3<<stm32.RCC_CCIPR3_LPUART1SEL_Pos,
stm32.RCC_CCIPR3_LPUART1SEL_Msk, 0)
}
if config.RX.getPort() == stm32.GPIOG || config.TX.getPort() == stm32.GPIOG {
// Enable VDDIO2 power supply for PGx pins
// Enable VDDIO2 voltage monitoring and wait for ready before
// declaring VDDIO2 supply valid (matches HAL_PWREx_EnableVddIO2).
stm32.PWR.SetSVMCR_IO2VMEN(1)
for stm32.PWR.GetSVMSR_VDDIO2RDY() == 0 {
}
stm32.PWR.SetSVMCR_IO2SV(1)
}
@@ -30,9 +46,18 @@ func (uart *UART) configurePins(config UARTConfig) {
config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)
}
// isLPUART1 returns true if this UART is backed by the LPUART1 peripheral.
func (uart *UART) isLPUART1() bool {
return uintptr(unsafe.Pointer(uart.Bus)) == uintptr(unsafe.Pointer(stm32.LPUART1))
}
// UART baudrate calc based on the bus and clockspeed
// NOTE: keep this in sync with the runtime/runtime_stm32u5.go clock init code
func (uart *UART) getBaudRateDivisor(baudRate uint32) uint32 {
if uart.isLPUART1() {
// LPUART uses BRR = 256 * fclk / baud
return (256 * CPUFrequency()) / baudRate
}
return CPUFrequency() / baudRate
}