stm32f767 and UART DMA IT (interrupts)

Posted on January 24, 2017 at 11:07

Hi,

How to use UART in DMA mode with interrupts IT.

I use the next code to transmit, and it works perfect. 

HAL_DMA_Start_IT(&hdma_usart3_tx, (uint32_t)msg, (uint32_t)&huart3.Instance->TDR, strlen(msg));

huart3.Instance->CR3 |= USART_CR3_DMAT; // DMAT: DMA enable transmitter

But receive Rx doesnt work

:(

HAL_DMA_Start_IT(&hdma_usart3_rx, (uint32_t)&huart3.Instance->RDR, (uint32_t)uRxBuff, 8);

huart3.Instance->CR3 |= USART_CR3_DMAR; // DMA enable receiver

DMA config:

/* Peripheral DMA init*/

hdma_usart3_rx.Instance = DMA1_Stream1;

hdma_usart3_rx.Init.Channel = DMA_CHANNEL_4;

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;

hdma_usart3_rx.XferCpltCallback = &DMAReceiveComplete;

if (HAL_DMA_Init(&hdma_usart3_rx) != HAL_OK)

{

Error_Handler();

}

__HAL_LINKDMA(huart,hdmarx,hdma_usart3_rx);

hdma_usart3_tx.Instance = DMA1_Stream3;

hdma_usart3_tx.Init.Channel = DMA_CHANNEL_4;

hdma_usart3_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

hdma_usart3_tx.Init.PeriphInc = DMA_PINC_DISABLE;

hdma_usart3_tx.Init.MemInc = DMA_MINC_ENABLE;

hdma_usart3_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;

hdma_usart3_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

hdma_usart3_tx.Init.Mode = DMA_NORMAL;

hdma_usart3_tx.Init.Priority = DMA_PRIORITY_LOW;

hdma_usart3_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

hdma_usart3_tx.XferCpltCallback = &DMATransferComplete;

if (HAL_DMA_Init(&hdma_usart3_tx) != HAL_OK)

{

Error_Handler();

}

__HAL_LINKDMA(huart,hdmatx,hdma_usart3_tx);

#stm32f7 #hal_uart_transmit_dma #interrupt #dma #stm32f767