stm32f103 dma空闲中断代码

以下是stm32f103 dma空闲中断代码的示例：

#include "stm32f10x.h"

DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

uint8_t dma_buffer[256];

void DMA1_Channel6_IRQHandler(void)
{
    if(DMA_GetITStatus(DMA1_IT_TC6)) // DMA transfer complete
    {
        DMA_ClearITPendingBit(DMA1_IT_GL6); // Clear global flag
        DMA_Cmd(DMA1_Channel6, DISABLE); // Disable DMA channel
    }
}

int main(void)
{
    // Enable DMA1 clock
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    // Configure DMA1 Channel6
    DMA_DeInit(DMA1_Channel6);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR; // Peripheral address
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)dma_buffer; // Memory address
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; // Peripheral to memory
    DMA_InitStructure.DMA_BufferSize = sizeof(dma_buffer); // Buffer size
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; // Peripheral address not incremented
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // Memory address incremented
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; // Peripheral data size
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; // Memory data size
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; // Normal mode
    DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; // Medium priority
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; // Memory to memory disabled
    DMA_Init(DMA1_Channel6, &DMA_InitStructure);

    // Enable DMA1 Channel6 interrupt
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // Enable DMA1 Channel6
    DMA_Cmd(DMA1_Channel6, ENABLE);

    while(1)
    {
        // Wait for DMA transfer complete
        while(DMA_GetFlagStatus(DMA1_FLAG_TC6) == RESET);
        DMA_ClearFlag(DMA1_FLAG_TC6); // Clear transfer complete flag
        // Process DMA buffer
    }
}

在上面的示例中，我们使用了DMA1通道6，它是USART1的数据寄存器（DR）的目标。我们设置了一个256字节的缓冲区dma_buffer，然后将DMA配置为将USART1的数据发送到该缓冲区中。在main()函数中，我们启用DMA1时钟，配置DMA通道6，并启用DMA1通道6中断。然后，我们等待DMA传输完成，并在处理DMA缓冲区中的数据后重复此过程。在DMA1_Channel6_IRQHandler()函数中，我们检查DMA传输完成标志，然后清除全局标志和禁用DMA通道。