stm32f10串口dma接收数据代码

以下是一个基本的 STM32F10 串口 DMA 接收数据的代码示例：

#include "stm32f10x.h"

#define BUFFER_SIZE 256

uint8_t buffer[BUFFER_SIZE];
uint16_t buffer_index = 0;

void DMA1_Channel5_IRQHandler(void)
{
    if (DMA_GetITStatus(DMA1_IT_TC5))
    {
        DMA_ClearITPendingBit(DMA1_IT_TC5);
        buffer_index = BUFFER_SIZE - DMA_GetCurrDataCounter(DMA1_Channel5);
    }
}

void USART1_IRQHandler(void)
{
    if (USART_GetITStatus(USART1, USART_IT_RXNE))
    {
        USART_ClearITPendingBit(USART1, USART_IT_RXNE);
        if (buffer_index < BUFFER_SIZE)
        {
            buffer[buffer_index++] = USART_ReceiveData(USART1);
        }
    }
}

int main(void)
{
    // 初始化串口和 DMA
    USART_InitTypeDef USART_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    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_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);

    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)buffer;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    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_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

    DMA_Init(DMA1_Channel5, &DMA_InitStructure);
    DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
    DMA_Cmd(DMA1_Channel5, ENABLE);

    // 启用中断
    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

    NVIC_Init(&NVIC_InitStructure);

    // 主循环
    while (1)
    {
        // 处理接收到的数据
        if (buffer_index > 0)
        {
            // 处理 buffer 中的数据
            // ...

            // 重置 buffer_index
            buffer_index = 0;
        }
    }
}

这个代码示例使用了 STM32F10 的 USART1 和 DMA1，通过 DMA1_Channel5 接收 USART1 的数据，并将数据存储在 buffer 数组中。当 DMA1_Channel5 接收到足够的数据后，会触发 DMA1_Channel5_IRQHandler 中断，此时可以通过 DMA_GetCurrDataCounter 函数获取已经接收到的数据量，从而确定 buffer 中存储的数据量。USART1_IRQHandler 中断用于将接收到的数据存储在 buffer 数组中。在主循环中，可以处理 buffer 中的数据。