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Continous UART/DMA receiver stops within STM32F0x

Question asked by Youssouf Coulibaly on Sep 4, 2017
Latest reply on Sep 7, 2017 by Youssouf Coulibaly

Hello,

 

I had a problem with my UART interface on STM32F091RC. I have seen that others encountered the same, but I am not able to fix yet in my side.

I have UART Rx and Tx in DMA normal mode.

Tx function is working fine (with long running test). But my Rx is stopping just after some random times (10s and 5 min or  2 min). And it is not tiggered any other interrupt ! 

I am using the code generated by Cube Mx.

 

void MX_USART2_UART_Init(void)
{

huart2->Instance = USART3;
huart2->Init.BaudRate = 115200;
huart2->Init.WordLength = UART_WORDLENGTH_8B;
huart2->Init.StopBits = UART_STOPBITS_1;
huart2->Init.Parity = UART_PARITY_NONE;
huart2->Init.Mode = UART_MODE_TX_RX;
huart2->Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2->Init.OverSampling = UART_OVERSAMPLING_16;
huart2->Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart2->AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(huart2) != HAL_OK)
{
//Error_Handler();
}
}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{

GPIO_InitTypeDef GPIO_InitStruct;
if(uartHandle->Instance==USART3)
{
/* Peripheral clock enable */
__HAL_RCC_USART3_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();

/**USART2 GPIO Configuration
PA2 ------> USART2_TX
PA3 ------> USART2_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_USART3;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* Peripheral DMA init*/

hdma_usart2_rx->Instance = DMA1_Channel1;
hdma_usart2_rx->Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_usart2_rx->Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart2_rx->Init.MemInc = DMA_MINC_ENABLE;
hdma_usart2_rx->Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart2_rx->Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart2_rx->Init.Mode = DMA_NORMAL;
hdma_usart2_rx->Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(hdma_usart2_rx) != HAL_OK)
{
//Error_Handler();
}

__HAL_DMA1_REMAP(HAL_DMA1_CH1_USART3_RX);

uartHandle->hdmarx = hdma_usart2_rx;
hdma_usart2_rx->Parent = uartHandle;
__HAL_LINKDMA(uartHandle, hdmarx, *hdma_usart2_rx);

hdma_usart2_tx->Instance = DMA1_Channel4;
hdma_usart2_tx->Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_usart2_tx->Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart2_tx->Init.MemInc = DMA_MINC_ENABLE;
hdma_usart2_tx->Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart2_tx->Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart2_tx->Init.Mode = DMA_NORMAL;
hdma_usart2_tx->Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(hdma_usart2_tx) != HAL_OK)
{
//Error_Handler();
}

__HAL_DMA1_REMAP(HAL_DMA1_CH4_USART3_TX);

uartHandle->hdmatx = hdma_usart2_tx;
hdma_usart2_tx->Parent = uartHandle;
__HAL_LINKDMA(uartHandle, hdmatx, *hdma_usart2_tx);

 

/* Peripheral interrupt init */
HAL_NVIC_SetPriority(USART3_8_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART3_8_IRQn);
}
}

 

void USART3_8_IRQHandler(void)
{
// If Overrun flag is still set, clear it
if (__HAL_UART_GET_FLAG(huart2, UART_FLAG_ORE) != RESET)
{
__HAL_UART_CLEAR_OREFLAG(huart2);

 

// Clear the buffer to prevent overrun
__HAL_UART_SEND_REQ(huart2, UART_RXDATA_FLUSH_REQUEST);
}

HAL_UART_IRQHandler(huart2);
}

I just added the overrun test here in cube mx base code. But even if I remove it still have the same issue on Rx function. 

 

Here all DMA channels are setting up.

void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();

/* DMA interrupt init */
/* DMA1_Ch1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Ch1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Ch1_IRQn);
/* DMA1_Ch2_3_DMA2_Ch1_2_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Ch2_3_DMA2_Ch1_2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Ch2_3_DMA2_Ch1_2_IRQn);
/* DMA1_Ch4_7_DMA2_Ch3_5_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Ch4_7_DMA2_Ch3_5_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Ch4_7_DMA2_Ch3_5_IRQn);
}

Here are the IRQ handler functions.

void DMA1_Ch1_IRQHandler(void)
{
HAL_DMA_IRQHandler(hdma_usart2_rx);
}

void DMA1_Ch4_7_DMA2_Ch3_5_IRQHandler(void)
{
HAL_DMA_IRQHandler(hdma_usart2_tx);
}

 

Would it be possible if someone can tell me what I am doing wrong in this code ?

Since 2 days I debugged this stuff without success.

 

Thanks a lot for your support. 

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