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。