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修复STM32MCU在不同优化级别使用rt_kprintf函数输出异常的问题 #10634

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修复STM32MCU在不同优化级别使用rt_kprintf函数输出异常的问题 #10634

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6 changes: 5 additions & 1 deletion bsp/stm32/libraries/HAL_Drivers/drivers/drv_usart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
* 2020-05-02 whj4674672 support stm32h7 uart dma
* 2020-09-09 forest-rain support stm32wl uart
* 2020-10-14 Dozingfiretruck Porting for stm32wbxx
* 2025-08-24 ItsGettingWorse Fixed bugs under different optimization levels
*/

#include "board.h"
Expand Down Expand Up @@ -353,7 +354,10 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
#else
uart->handle.Instance->DR = c;
#endif
while (__HAL_UART_GET_FLAG(&(uart->handle), UART_FLAG_TC) == RESET && --block_timeout);
while (__HAL_UART_GET_FLAG(&(uart->handle), UART_FLAG_TC) == RESET && --block_timeout)
{
__DSB(); // Data Synchronization Barrier
}
return (block_timeout != 0) ? 1 : -1;
}

Expand Down