DMA UART

stm32h743 uart3 dma 接收问题

发布于 2021-04-15 13:48:29 浏览：2019 订阅该版

4 个回答

mii 2021-04-15

这家伙很懒，什么也没写！

flashman2002 2021-04-15

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kingchunhai 2021-04-15

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flashman2002 2021-04-15

这家伙很懒，什么也没写！

kingchunhai 2021-04-15

这家伙很懒，什么也没写！

kingchunhai 2021-04-15

这家伙很懒，什么也没写！

kingchunhai 2021-04-15

这家伙很懒，什么也没写！

kingchunhai 2021-04-16

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kingchunhai 2021-04-16

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我的dma配置代码有问题么？
```
#ifdef RT_SERIAL_USING_DMA
static void stm32_dma_config(struct rt_serial_device *serial, rt_ubase_t flag)
{
    struct rt_serial_rx_fifo *rx_fifo;
    DMA_HandleTypeDef *DMA_Handle;
    struct dma_config *dma_config;
    struct stm32_uart *uart;
    
    RT_ASSERT(serial != RT_NULL);
    uart = rt_container_of(serial, struct stm32_uart, serial);

if (RT_DEVICE_FLAG_DMA_RX == flag)
    {
        DMA_Handle = &uart->dma_rx.handle;
        dma_config = uart->config->dma_rx;
    }
    else if (RT_DEVICE_FLAG_DMA_TX == flag)
    {
        DMA_Handle = &uart->dma_tx.handle;
        dma_config = uart->config->dma_tx;
    }
    LOG_D("%s dma config start", uart->config->name);

{
        rt_uint32_t tmpreg = 0x00U;
#if defined(SOC_SERIES_STM32F1) || defined(SOC_SERIES_STM32F0) || defined(SOC_SERIES_STM32G0) \
    || defined(SOC_SERIES_STM32L0)
        /* enable DMA clock && Delay after an RCC peripheral clock enabling*/
        SET_BIT(RCC->AHBENR, dma_config->dma_rcc);
        tmpreg = READ_BIT(RCC->AHBENR, dma_config->dma_rcc);
#elif defined(SOC_SERIES_STM32F4) || defined(SOC_SERIES_STM32F7) || defined(SOC_SERIES_STM32L4) \
    || defined(SOC_SERIES_STM32G4)
        /* enable DMA clock && Delay after an RCC peripheral clock enabling*/
        SET_BIT(RCC->AHB1ENR, dma_config->dma_rcc);
        tmpreg = READ_BIT(RCC->AHB1ENR, dma_config->dma_rcc);

#if (defined(SOC_SERIES_STM32L4) || defined(SOC_SERIES_STM32G4)) && defined(DMAMUX1)
        /* enable DMAMUX clock for L4+ and G4 */
        __HAL_RCC_DMAMUX1_CLK_ENABLE();
#endif

#endif
        UNUSED(tmpreg);   /* To avoid compiler warnings */
    }

if (RT_DEVICE_FLAG_DMA_RX == flag)
    {
        __HAL_LINKDMA(&(uart->handle), hdmarx, uart->dma_rx.handle);
    }
    else if (RT_DEVICE_FLAG_DMA_TX == flag)
    {
        __HAL_LINKDMA(&(uart->handle), hdmatx, uart->dma_tx.handle);
    }

#if defined(SOC_SERIES_STM32F1) || defined(SOC_SERIES_STM32F0) || defined(SOC_SERIES_STM32L0)
    DMA_Handle->Instance                 = dma_config->Instance;
#elif defined(SOC_SERIES_STM32F4) || defined(SOC_SERIES_STM32F7)
    DMA_Handle->Instance                 = dma_config->Instance;
    DMA_Handle->Init.Channel             = dma_config->channel;
#elif defined(SOC_SERIES_STM32L4) || defined(SOC_SERIES_STM32G0) || defined(SOC_SERIES_STM32G4)
    DMA_Handle->Instance                 = dma_config->Instance;
    DMA_Handle->Init.Request             = dma_config->request;
#endif
    DMA_Handle->Instance                    =DMA1_Stream1;
    DMA_Handle->Init.PeriphInc           = DMA_PINC_DISABLE;
    DMA_Handle->Init.MemInc              = DMA_MINC_ENABLE;
    DMA_Handle->Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    DMA_Handle->Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;
    
    if (RT_DEVICE_FLAG_DMA_RX == flag)
    {
        DMA_Handle->Init.Direction           = DMA_PERIPH_TO_MEMORY;
        DMA_Handle->Init.Mode                = DMA_NORMAL ;
    }
    else if (RT_DEVICE_FLAG_DMA_TX == flag)
    {
        DMA_Handle->Init.Direction           = DMA_MEMORY_TO_PERIPH;
        DMA_Handle->Init.Mode                = DMA_NORMAL;
    }
    
    DMA_Handle->Init.Priority            = DMA_PRIORITY_MEDIUM;
#if defined(SOC_SERIES_STM32F4) || defined(SOC_SERIES_STM32F7)
    DMA_Handle->Init.FIFOMode            = DMA_FIFOMODE_DISABLE;
#endif
    if (HAL_DMA_DeInit(DMA_Handle) != HAL_OK)
    {
        RT_ASSERT(0);
    }

if (HAL_DMA_Init(DMA_Handle) != HAL_OK)
    {
        RT_ASSERT(0);
    }

/* enable interrupt */
    if (flag == RT_DEVICE_FLAG_DMA_RX)
    {
        rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx;
        /* Start DMA transfer */
        if (HAL_UART_Receive_DMA(&(uart->handle), rx_fifo->buffer, serial->config.bufsz) != HAL_OK)
        {
            /* Transfer error in reception process */
            RT_ASSERT(0);
        }
        CLEAR_BIT(uart->handle.Instance->CR3, USART_CR3_EIE);
        __HAL_UART_ENABLE_IT(&(uart->handle), UART_IT_IDLE);
    }
 
    /* enable irq */
    HAL_NVIC_SetPriority(dma_config->dma_irq, 0, 0);
    HAL_NVIC_EnableIRQ(dma_config->dma_irq);

HAL_NVIC_SetPriority(uart->config->irq_type, 1, 0);
    HAL_NVIC_EnableIRQ(uart->config->irq_type);

LOG_D("%s dma %s instance: %x", uart->config->name, flag == RT_DEVICE_FLAG_DMA_RX ? "RX" : "TX", DMA_Handle->Instance);
    LOG_D("%s dma config done", uart->config->name);
}

```