osMessagePut usages in UART ISR

[louiey]

Hi.

I'm using STM32F746-DISCOVERY EVM with CubeIDE (v1.4.2)

I'm trying to send uart rx char via osMessagePut API in uart ISR to other task which waits uart que.

in uart isr callback, when I get rx char, I send rx byte via osMessagePut ().

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	if(huart->Instance == cliPort)
	{
		osMessagePut (uartQueHandle, huart->Instance->RDR & (uint16_t)0x01FF, 0);
	}
}

and receive part is below

uint16_t bsp_uart_gets(uint8_t* buf)
{
	HAL_StatusTypeDef result;
	uint16_t size = 0;
	char ch;
	while(1)
	{
		result = HAL_UART_Receive_IT(cliHandle, (uint8_t*)&ch, 1);
		if(result != HAL_OK)
		{
			LOG("result - %d - %c\n", result, ch);
		}
		
		osEvent evt = osMessageGet (uartQueHandle, osWaitForever);
		if(evt.status == osEventMessage)
		{
			ch = evt.value.v;
			// in case of line end, return
			if( (ch == '\n') || (ch == '\r') )
			{
				return size;
			}
			
			buf[size++] = ch;
			if(size > 64*2)
				size = 0;
		}
		else
		{
			
		}
	}
}

So when I get uart rx interrupt, I send rx char via osMessagePut().

But when I call osMessagePut(), it stuck at port.c, vPortValidateInterruptPriority/configASSERT( ucCurrentPriority >= ucMaxSysCallPriority ).

Looks relates with interrupt priority so I have changed uart interrupt priority but still same issue happened. (it was '0' and changed to '8'/'15' and same)

 

Actually I used this code for long time and lately I have a new project and testing but it causes problem, interrupt priority issue.

I read many information and it seems to be interrupt priority issue but not sure how to fix this.

Can you help how to handle this?

[Nesrine.JLASSI]

Hi @louiey​ 

Thanks for the feedback, NVIC does not support FreeRTOS in STM32CubeMX v6.0.0 and so the SysTick_IRQn priority preemption is left intact (left at 0) when FreeRTOS is enabled. The next STM32CubeMX version will correct this.

Best regards,

Nesrine

[louiey · Accepted solution]

Manually set its interrupt priority to "5" and it works.

Waiting for next release.