Posted on January 24, 2017 at 11:07Hi,
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
