使用HAL库的STM32工程，实现DMA传输USART发送接收数据

PoroKing

已于 2024-12-28 09:02:09 修改

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分类专栏：单片机开发笔记文章标签： stm32 单片机嵌入式硬件 USART DMA HAL库

于 2024-10-25 08:30:22 首次发布

本文链接：https://blog.youkuaiyun.com/PoroKing/article/details/143213894

版权

以串口3为例，初始化部分为STM32CubeMX生成代码

串口初始化

UART_HandleTypeDef huart3;
DMA_HandleTypeDef hdma_usart3_rx;
DMA_HandleTypeDef hdma_usart3_tx;

/* USART3 init function */
void MX_USART3_UART_Init(void)
{
   
    /* USER CODE BEGIN USART3_Init 0 */

    /* USER CODE END USART3_Init 0 */

    /* USER CODE BEGIN USART3_Init 1 */

    /* USER CODE END USART3_Init 1 */
    huart3.Instance = USART3;
    huart3.Init.BaudRate = 115200;
    huart3.Init.WordLength = UART_WORDLENGTH_8B;
    huart3.Init.StopBits = UART_STOPBITS_1;
    huart3.Init.Parity = UART_PARITY_NONE;
    huart3.Init.Mode = UART_MODE_TX_RX;
    huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    huart3.Init.OverSampling = UART_OVERSAMPLING_16;
    huart3.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
    huart3.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;

    if (HAL_UART_Init(&huart3) != HAL_OK)
    {
   
        Error_Handler();
    }

    /* USER CODE BEGIN USART3_Init 2 */

    /* USER CODE END USART3_Init 2 */
}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{
   

    GPIO_InitTypeDef GPIO_InitStruct = {
   0};
    RCC_PeriphCLKInitTypeDef PeriphClkInit = {
   0};

	if(uartHandle->Instance == USART3)
    {
   
        /* USER CODE BEGIN USART3_MspInit 0 */

        /* USER CODE END USART3_MspInit 0 */

        /** Initializes the peripherals clock
        */
        PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART3;
        PeriphClkInit.Usart3ClockSelection = RCC_USART3CLKSOURCE_PCLK1;

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