Hello ,
I am trying to configure RX (only) with dma. I am using DMA2 stream5 on usart3
I have connected USB to UART bridge (4 wire) on 40 pin headers RX,TX,VDD(3) and GND on CN7. Whenever I am trying to send any data from the comport (teraterm ) from windows PC , nothing happens (on the RX side) on the CM4 of MPU.
My code :
/* Peripheral clock enable */
__HAL_RCC_USART3_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/**USART3 GPIO Configuration
PB10 ------> USART3_TX
PB12 ------> USART3_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF7_USART3;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_AF;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Alternate = GPIO_AF8_USART3;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* USART3 DMA Init */
/* USART3_RX Init */
hdma_usart3_rx.Instance = DMA2_Stream5;
hdma_usart3_rx.Init.Request = DMA_REQUEST_USART3_RX;
hdma_usart3_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_usart3_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart3_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart3_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart3_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart3_rx.Init.Mode = DMA_NORMAL;
hdma_usart3_rx.Init.Priority = DMA_PRIORITY_LOW;
hdma_usart3_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_usart3_rx) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(huart,hdmarx,hdma_usart3_rx);
/* USART3 interrupt Init */
HAL_NVIC_SetPriority(USART3_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(USART3_IRQn);
/* USER CODE BEGIN USART3_MspInit 1 */
it.c :
void USART3_IRQHandler(void)
{
/* USER CODE BEGIN USART3_IRQn 0 */
/* USER CODE END USART3_IRQn 0 */
HAL_UART_IRQHandler(&huart3);
/* USER CODE BEGIN USART3_IRQn 1 */
/* USER CODE END USART3_IRQn 1 */
}
/**
* @brief This function handles DMA2 stream5 global interrupt.
*/
void DMA2_Stream5_IRQHandler(void)
{
/* USER CODE BEGIN DMA2_Stream5_IRQn 0 */
/* USER CODE END DMA2_Stream5_IRQn 0 */
HAL_DMA_IRQHandler(&hdma_usart3_rx);
/* USER CODE BEGIN DMA2_Stream5_IRQn 1 */
/* USER CODE END DMA2_Stream5_IRQn 1 */
}
I am polling : (__HAL_DMA_GET_FLAG(handle_dma, __HAL_DMA_GET_TE_FLAG_INDEX(handle_dma))
but getting the counter always 1.
> baudrates and reversing Rx,Tx I have already done.
Can you please assist where else I can debug?
Regards,
