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STM32L4: support UART5 for debug output #37

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Merged
thomasw04 merged 4 commits into from
Mar 1, 2026
Merged

STM32L4: support UART5 for debug output #37

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fa05446
STM32L4: support UART5 output
xarantolus Mar 1, 2026
6e67d6c
Re-add OSIRIS_DEBUG_UART check
xarantolus Mar 1, 2026
636cec1
Don't use chip-specific header
xarantolus Mar 1, 2026
0561a48
Merge remote-tracking branch 'github/main' into feature/print-uart5
xarantolus Mar 1, 2026
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32 changes: 31 additions & 1 deletion machine/arm/stm32l4xx/interface/uart.c
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Original file line number Diff line number Diff line change
@@ -1,5 +1,9 @@

#include "lib.h"
#include "stm32l4xx.h"
#include "stm32l4xx_hal_gpio.h"
#include "stm32l4xx_hal_rcc.h"
#include "stm32l4xx_hal_rcc_ex.h"

#include <stm32l4xx_hal.h>

Expand Down Expand Up @@ -50,5 +54,31 @@ void HAL_UART_MspInit(UART_HandleTypeDef *huart) {
HAL_PWREx_EnableVddIO2();
__HAL_RCC_GPIOG_CLK_ENABLE();
HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
} else if (huart->Instance == UART5) {

RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_UART5;
PeriphClkInit.Uart5ClockSelection = RCC_UART5CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
return;
}

__HAL_RCC_UART5_CLK_ENABLE();

// Enable GPIO clocks
HAL_PWREx_EnableVddIO2();
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();

GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_12; // PC12 == UART5_TX
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_UART5;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
// PD2 == UART5_RX
GPIO_InitStruct.Pin = GPIO_PIN_2;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
}
}
}
4 changes: 2 additions & 2 deletions options.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ type = "Boolean"
[debug.uart]
name = "Debug UART"
description = "Select the UART peripheral to use for debug output."
type = { type = "String", allowed_values = ["LPUART1"] }
type = { type = "String", allowed_values = ["LPUART1", "UART5"] }
default = "LPUART1"

[tuning]
Expand All @@ -36,4 +36,4 @@ default = 8192
name = "Application Stack Size"
description = "Sets the size of the stack for the init application. This must be less than the application memory size."
type = { type = "Integer", min = 0 }
default = 2048
default = 2048
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