DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);

DMA_ITConfig函数是一个STM32内核中的DMA库函数，它用于配置DMA通道中传输完成（Transfer Complete）中断的开关控制。其第一个参数为DMA通道号，第二个参数为中断类型，第三个参数为开关控制（ENABLE或DISABLE）。在本例中，该函数的作用是使DMA1通道5在传输完成时触发中断，并使该中断被开启。这意味着当DMA1通道5完成数据传输时，该中断将被触发并执行相应的中断处理程序。需要注意的是，开启中断后还需要相应的中断处理函数来实现具体的功能。

相关问题

用STM32F4的库函数写通过DMA_GetCurrentMemoryTarget函数判断DMA中断里面需要处理双缓冲哪一组数据

以下是用STM32F4的库函数写通过DMA_GetCurrentMemoryTarget函数判断DMA中断里面需要处理双缓冲哪一组数据的示例代码：

#include "stm32f4xx.h"

#define BUFFER_SIZE 256

uint16_t buffer1[BUFFER_SIZE];
uint16_t buffer2[BUFFER_SIZE];

DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

void init_DMA(void)
{
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
    
    DMA_InitStructure.DMA_Channel = DMA_Channel_0;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)buffer1;
    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_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    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(DMA1_Stream0, &DMA_InitStructure);
    
    DMA_ITConfig(DMA1_Stream0, DMA_IT_TC, ENABLE);
    
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    
    NVIC_Init(&NVIC_InitStructure);
    
    DMA_Cmd(DMA1_Stream0, ENABLE);
}

void DMA1_Stream0_IRQHandler(void)
{
    if (DMA_GetITStatus(DMA1_Stream0, DMA_IT_TCIF0))
    {
        DMA_ClearITPendingBit(DMA1_Stream0, DMA_IT_TCIF0);
        
        if (DMA_GetCurrentMemoryTarget(DMA1_Stream0) == 0)
        {
            // Process buffer1
        }
        else
        {
            // Process buffer2
        }
    }
}

int main(void)
{
    init_DMA();
    
    while (1)
    {
        // Main program loop
    }
}

在这个示例代码中，首先定义了两个缓冲区`buffer1`和`buffer2`，并且使用DMA将ADC1的数据传输到这两个缓冲区中。在DMA中断里面，使用`DMA_GetCurrentMemoryTarget`函数判断当前需要处理的是哪一个缓冲区，然后进行相应的处理。

需要注意的是，在初始化DMA的时候，要将`DMA_Mode`设置为`DMA_Mode_Circular`，这样才能实现双缓冲的功能。另外，在使用`DMA_GetCurrentMemoryTarget`函数之前，要确保DMA已经传输了至少一次数据，否则该函数会返回错误的结果。

STM32F1标准库DMA串口1收发示例

好的，下面是使用STM32F1标准库中的DMA实现串口1收发的示例代码，供您参考：

// 定义缓冲区大小
#define BUFFER_SIZE 100

// 定义缓冲区
uint8_t RxBuffer[BUFFER_SIZE];
uint8_t TxBuffer[BUFFER_SIZE];

// 定义DMA通道和USART
DMA_Channel_TypeDef* DMA_CHx;
USART_TypeDef* USARTx;

// 初始化串口
void USART1_Init(void)
{
    // 使能USART时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    
    // 配置USART参数
    USART_InitTypeDef USART_InitStructure;
    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);
    
    // 使能USART
    USART_Cmd(USART1, ENABLE);
}

// 初始化DMA
void DMA1_Channel4_Init(void)
{
    // 使能DMA时钟
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    
    // 配置DMA通道
    DMA_InitTypeDef DMA_InitStructure;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USARTx->DR;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RxBuffer;
    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_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel4, &DMA_InitStructure);
    
    // 使能DMA通道中断
    DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);
    
    // 使能DMA通道
    DMA_Cmd(DMA1_Channel4, ENABLE);
}

// DMA传输完成中断处理函数
void DMA1_Channel4_IRQHandler(void)
{
    // 判断传输是否完成
    if (DMA_GetFlagStatus(DMA1_FLAG_TC4))
    {
        // 清除传输完成标志
        DMA_ClearFlag(DMA1_FLAG_TC4);
        
        // 处理接收数据
        uint16_t length = BUFFER_SIZE - DMA_GetCurrDataCounter(DMA1_Channel4);
        for (uint16_t i = 0; i < length; i++)
        {
            // 处理接收到的数据
            // ...
        }
        
        // 启动下一次DMA传输
        DMA_SetCurrDataCounter(DMA1_Channel4, BUFFER_SIZE);
        DMA_Cmd(DMA1_Channel4, ENABLE);
    }
}

// 发送数据
void USART_SendData(uint8_t* data, uint16_t length)
{
    // 等待USART发送缓冲区为空
    while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
    
    // 启动DMA传输
    DMA_Cmd(DMA1_Channel4, DISABLE);
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)data;
    DMA_InitStructure.DMA_BufferSize = length;
    DMA_Init(DMA1_Channel4, &DMA_InitStructure);
    DMA_Cmd(DMA1_Channel4, ENABLE);
    
    // 等待DMA传输完成
    while (DMA_GetFlagStatus(DMA1_FLAG_TC4) == RESET);
}

以上代码仅供参考，具体实现还需要根据实际情况进行调整和优化。