写一个dma控制器初始化代码

A：

以下是一个简单的DMA控制器初始化代码的示例：

/*  DMA Control Register */
#define DMA_CONTROL_REG        (*((volatile unsigned int *) 0x40001FF8))

/*  DMA Channel 0 Configuration Register */
#define DMA_CONFIG_REG         (*((volatile unsigned int *) 0x40020000))

/*  Source Address */
#define DMA_SRC_ADDR           (*((volatile unsigned int *) 0x40020004))

/*  Destination Address */
#define DMA_DEST_ADDR          (*((volatile unsigned int *) 0x40020008))

/*  Number of Bytes to Transfer */
#define DMA_TRANSFER_SIZE      (*((volatile unsigned int *) 0x4002000C))

void init_dma_controller(void)
{
    /* Disable DMA Controller */
    DMA_CONTROL_REG = 0x0;

    /* DMA Channel 0 Configuration - Peripheral to Memory Transfer */
    DMA_CONFIG_REG = 0x08;
    
    /* Set Source Address */
    DMA_SRC_ADDR = 0x40000000;
    
    /* Set Destination Address */
    DMA_DEST_ADDR = 0x20000000;
    
    /* Set Number of Bytes to Transfer */
    DMA_TRANSFER_SIZE = 64;

    /* Enable DMA Controller */
    DMA_CONTROL_REG = 0x1;
}

这段代码初始化了一个DMA控制器，将外设传输到内存。仅供参考，具体实现应根据所使用的芯片和外设进行调整。