UART and timer interrupt issue

[SGonz.2]

Hello! Can you help me?

I'm receiving data in UART Rx with DMA and send it by USB, it works fine. Now i'm trying to set up a timer to check if I'm receiving data every 250[ms] and send a special message. When I don't configure the timer it works, but when I add the timer and receive data, I only send the special message even when it should send the UART Rx data.

This is my UserDataTreatment function, called inside the UART+DMA callback

void UserDataTreatment(UART_HandleTypeDef *huart, uint8_t* pData, uint16_t Size){
 
 if(huart->Instance == USART1){
	 uint8_t* pBuff = pData;
	 uint8_t i;
	 uint8_t DataArray[USB_BUFFER_SIZE];
	 for (i = 0; i < Size; i++){
		DataArray[i] = *pBuff;
	 pBuff++;
	 }
	 __HAL_TIM_SetCounter(&htim2, 0);
	 CDC_Transmit_FS(DataArray, Size);
 }
}

And this is my period elapsed callback

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef* htim){
	if(htim->Instance == TIM2){
		CDC_Transmit_FS(disconectMSG1, 5);
	}
}

The idea is to set up a timer, reset it in the UART callback, so if I don't don't receive data, the timer overflows and send the special message.

Thank you!

[waclawek.jan]

> CDC_Transmit_FS(DataArray, Size);

​

Is it OK to use a local variable here?

​

JW​

[SGonz.2]

Yes, at least it works when timer are not enabled, but my problem is when I enable timers(TIM2, TIM3, TIM4) USART1, USART2 and USART3 appears to stop working.

Now I'm just sending data to USART1 Rx every 100[ms], if no data is received in 1[s], then make and interrupt and send a USB message, but it only executes the timer interrupt, like no data is received. I have a version without timers and USART works fine.