RT-Thread-F030系列芯片UART3~UART6 代码分享可正常使用RT-Thread问答社区

F030系列芯片UART3~UART6 代码分享可正常使用

发布于 2023-01-13 23:42:29 浏览：784 订阅该版

看了大家对F030复用串口的疑惑，这里继续给出“当同时使用UART3~UART6中的多个串口时，由于其中断响应函数都是同一个，需要自己在中断函数USART3_6_IRQHandler() 中判断是来自哪个串口的中断。”这个问题的解决办法。这里使用的是串口V2版本。
```c
void USART3_6_IRQHandler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();
    struct stm32_uart *uart3,*uart4,*uart5;

uart5 = rt_container_of(&(uart_obj[UART5_INDEX].serial), struct stm32_uart, serial);
    uart3 = rt_container_of(&(uart_obj[UART3_INDEX].serial), struct stm32_uart, serial);
    uart4 = rt_container_of(&(uart_obj[UART4_INDEX].serial), struct stm32_uart, serial);
    if(__HAL_UART_GET_FLAG(&(uart3->handle), UART_FLAG_RXNE) != RESET)
        uart_isr(&(uart_obj[UART3_INDEX].serial));
    if(__HAL_UART_GET_FLAG(&(uart4->handle), UART_FLAG_RXNE) != RESET)
        uart_isr(&(uart_obj[UART4_INDEX].serial));
    if(__HAL_UART_GET_FLAG(&(uart5->handle), UART_FLAG_RXNE) != RESET)
        uart_isr(&(uart_obj[UART5_INDEX].serial));
    /* leave interrupt */
    rt_interrupt_leave();
}
```
其中就是加入了获取串口的判断，执行不同中断ISR。还有一点需要注意，F030RC的默认DMA通道是Cxs 0级别的中断，如果需要使用串口的DMA中断，需要在DMA初始化的时候添加__HAL_DMA1_REMAP（）函数，
![屏幕截图 2023-01-13 234007.png](https://oss-club.rt-thread.org/uploads/20230113/f05dc9edd774fe55c989fc9328eff848.png.webp)
据需要选择不同串口即可，下面是DMA初始化代码。

```c
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);
    RT_ASSERT(flag == RT_DEVICE_FLAG_DMA_TX || flag == RT_DEVICE_FLAG_DMA_RX);
    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 /* 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_STM32WL) \
    || defined(SOC_SERIES_STM32G4)|| defined(SOC_SERIES_STM32H7) || defined(SOC_SERIES_STM32WB)
        /* 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);
#elif defined(SOC_SERIES_STM32MP1)
        /* enable DMA clock && Delay after an RCC peripheral clock enabling*/
        SET_BIT(RCC->MP_AHB2ENSETR, dma_config->dma_rcc);
        tmpreg = READ_BIT(RCC->MP_AHB2ENSETR, dma_config->dma_rcc);
#endif

#if defined(DMAMUX1) && (defined(SOC_SERIES_STM32L4) || defined(SOC_SERIES_STM32WL) || defined(SOC_SERIES_STM32G4) || defined(SOC_SERIES_STM32WB))
        /* enable DMAMUX clock for L4+ and G4 */
        __HAL_RCC_DMAMUX1_CLK_ENABLE();
#elif defined(SOC_SERIES_STM32MP1)
        __HAL_RCC_DMAMUX_CLK_ENABLE();
#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_STM32WL) || defined(SOC_SERIES_STM32G0) || defined(SOC_SERIES_STM32G4) || defined(SOC_SERIES_STM32WB)\
    || defined(SOC_SERIES_STM32H7) || defined(SOC_SERIES_STM32MP1)
    DMA_Handle->Instance                 = dma_config->Instance;
    DMA_Handle->Init.Request             = dma_config->request;
#endif
    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_CIRCULAR;
    }
    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) || defined(SOC_SERIES_STM32H7) || defined(SOC_SERIES_STM32MP1)
    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);
    }

__HAL_DMA1_REMAP(HAL_DMA1_CH3_USART3_RX);  //添加这两个即可
        __HAL_DMA1_REMAP(HAL_DMA1_CH1_USART4_RX);

/* enable interrupt */
    if (flag == RT_DEVICE_FLAG_DMA_RX)
    {
        rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx;
        RT_ASSERT(rx_fifo != RT_NULL);
        /* Start DMA transfer */
        if (HAL_UART_Receive_DMA(&(uart->handle), rx_fifo->buffer, serial->config.rx_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);
    }

/* DMA irq should set in DMA TX mode, or HAL_UART_TxCpltCallback function will not be called */
    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);
}
```