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這里用DMA方式寫入DPI 只是證明控制字寫入，其數(shù)據(jù)的寫入只需將DC 控制端口設(shè)置為1；

#include <cdefBF533.h>   //BF533 Register Pointer Definition
#include <stdio.h>
#include <sys\exception.h>

#define CODEC_1836_REGS_LENGTH 7

short sCodec1836TxRegs[CODEC_1836_REGS_LENGTH] =
{0x21,0xc8,0x06,0x13,0x20,0x0c,0x80};

void Init_EBIU(void)
{
*pEBIU_AMBCTL0 = 0x7bb07bb0;
*pEBIU_AMBCTL1 = 0x7bb07bb0;
*pEBIU_AMGCTL = 0x000f;
}

void main(void)
{

int i;
int j;
*pFIO_DIR=0x0f;
Init_EBIU();

// write to Port A to reset AD1836
*pFIO_FLAG_C = 0x08;    //reset

// write to Port A to enable AD1836
*pFIO_FLAG_S = 0x08;

// wait to recover from reset
for (i=0; i<0xf0000; i++) asm("nop;");

// Enable PF4
*pSPI_FLG = FLS4;
// Set baud rate SCK = HCLK/(2*SPIBAUD) SCK = 2MHz
*pSPI_BAUD = 16;
// configure spi port
// SPI DMA write, 16-bit data, MSB first, SPI Master
*pSPI_CTL = 0x03 | SIZE | MSTR;            //有下劃線的是與普通模式不同的

// Set up DMA5 to transmit
// Map DMA5 to SPI
*pDMA5_PERIPHERAL_MAP = 0x5000;

// Configure DMA5
// 16-bit transfers
*pDMA5_CONFIG = WDSIZE_8;

*pFIO_FLAG_C = 0x02;

// Start address of data buffer
*pDMA5_START_ADDR = (void *)sCodec1836TxRegs;
// DMA inner loop count
*pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH;
// Inner loop address increment
*pDMA5_X_MODIFY = 2;
   // enable DMAs
*pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN);
// enable spi
*pSPI_CTL = (*pSPI_CTL | SPE);

// wait until dma transfers for spi are finished
for (j=0; j<0xaff0; j++) asm("nop;");

// disable spi
// *pSPI_CTL = 0x0000;
  
   
}