stm32完整的串口dMA接收代码

以下是一个基于STM32的完整串口DMA接收代码示例：

#include "stm32f4xx.h"
#include "stm32f4xx_dma.h"
#include "stm32f4xx_usart.h"
#include "misc.h"

#define BUFFER_SIZE 1024

uint8_t buffer[BUFFER_SIZE];

void USART_Config(void);
void DMA_Config(void);
void NVIC_Config(void);

int main(void)
{
    USART_Config();
    DMA_Config();
    NVIC_Config();

    while (1)
    {
    }
}

void USART_Config()
{
    USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    // Enable the USART and GPIOA peripheral clocks
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    // Configure USART1 Tx pin as alternate function push-pull
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // Configure USART1 Rx pin as input floating
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // Connect the USART1 pins to their alternate function
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);

    // Configure USART1 for 115200 baud, 8-bit data, no parity, and 1 stop bit
    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);

    // Enable USART1
    USART_Cmd(USART1, ENABLE);
}

void DMA_Config()
{
    DMA_InitTypeDef DMA_InitStructure;

    // Enable the DMA2 peripheral clock
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

    // Configure DMA2 Stream5 for USART1 Rx
    DMA_InitStructure.DMA_Channel = DMA_Channel_4;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)buffer;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream5, &DMA_InitStructure);

    // Enable DMA2 Stream5
    DMA_Cmd(DMA2_Stream5, ENABLE);

    // Enable USART1 Rx DMA request
    USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
}

void NVIC_Config()
{
    NVIC_InitTypeDef NVIC_InitStructure;

    // Enable the DMA2 Stream5 global interrupt
    NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // Enable the USART1 global interrupt
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void DMA2_Stream5_IRQHandler()
{
    if (DMA_GetITStatus(DMA2_Stream5, DMA_IT_TCIF5))
    {
        DMA_ClearITPendingBit(DMA2_Stream5, DMA_IT_TCIF5);

        // Process the received data here
        // ...

        // Restart the DMA transfer
        DMA_Cmd(DMA2_Stream5, ENABLE);
    }
}

void USART1_IRQHandler()
{
    if (USART_GetITStatus(USART1, USART_IT_RXNE))
    {
        USART_ClearITPendingBit(USART1, USART_IT_RXNE);

        // Process the received data here
        // ...
    }
}

这个示例代码使用DMA2 Stream5在USART1的接收模式下接收数据，并在接收完成后触发DMA2 Stream5的中断处理程序。在中断处理程序中，可以对接收到的数据进行处理，并重新启动DMA传输。注意，这个示例代码还启用了USART1的中断机制，以便在接收数据时能够及时处理。