stm32f407dma与串口接收的代码

您好！以下是一个示例代码，用于在STM32F407上使用DMA接收串口数据：

#include "stm32f4xx.h"

#define BUFFER_SIZE  64

// 串口接收缓冲区
uint8_t rxBuffer[BUFFER_SIZE];

int main(void)
{
    // 初始化串口和DMA
    USART_InitTypeDef usartConfig;
    DMA_InitTypeDef dmaConfig;
    
    // 使能USART2和DMA1的时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
    
    // 配置USART2的引脚
    GPIO_InitTypeDef gpioConfig;
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    
    gpioConfig.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
    gpioConfig.GPIO_Mode = GPIO_Mode_AF;
    gpioConfig.GPIO_OType = GPIO_OType_PP;
    gpioConfig.GPIO_PuPd = GPIO_PuPd_UP;
    gpioConfig.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &gpioConfig);
    
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
    
    // 配置USART2
    usartConfig.USART_BaudRate = 115200;
    usartConfig.USART_WordLength = USART_WordLength_8b;
    usartConfig.USART_StopBits = USART_StopBits_1;
    usartConfig.USART_Parity = USART_Parity_No;
    usartConfig.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    usartConfig.USART_Mode = USART_Mode_Rx;
    USART_Init(USART2, &usartConfig);
    
    // 配置DMA1 Stream5 Channel4
    dmaConfig.DMA_Channel = DMA_Channel_4;
    dmaConfig.DMA_PeripheralBaseAddr = (uint32_t)&(USART2->DR);
    dmaConfig.DMA_Memory0BaseAddr = (uint32_t)rxBuffer;
    dmaConfig.DMA_DIR = DMA_DIR_PeripheralToMemory;
    dmaConfig.DMA_BufferSize = BUFFER_SIZE;
    dmaConfig.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    dmaConfig.DMA_MemoryInc = DMA_MemoryInc_Enable;
    dmaConfig.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    dmaConfig.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    dmaConfig.DMA_Mode = DMA_Mode_Circular;
    dmaConfig.DMA_Priority = DMA_Priority_High;
    dmaConfig.DMA_FIFOMode = DMA_FIFOMode_Disable;
    dmaConfig.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    dmaConfig.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    dmaConfig.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    
    DMA_Init(DMA1_Stream5, &dmaConfig);
    
    // 使能DMA1 Stream5
    DMA_Cmd(DMA1_Stream5, ENABLE);
    
    // 使能USART2的DMA接收
    USART_DMACmd(USART2, USART_DMAReq_Rx, ENABLE);
    
    // 启动USART2
    USART_Cmd(USART2, ENABLE);
    
    while (1)
    {
        // 在这里处理接收到的数据
        // ...
    }
}

这段代码使用了USART2和DMA1 Stream5来实现串口接收功能。它配置了USART2的引脚和参数，并配置了DMA1 Stream5的通道和缓冲区。接收到的数据将存储在rxBuffer数组中，您可以在主循环中处理接收到的数据。

请注意，此代码仅提供了基本的串口接收功能，并未包含错误处理和其他功能。您可能需要根据您的实际需求进行适当的修改和扩展。