test.c

基于linux嵌入式系统,芯片为AC48x的DSP驱动源码以及测试程序

#include <sys/ioctl.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>

#define DEVICE_AAA "/dev/dsp"
int fd;

#define DEVICE_RESET 100
   /*Control Register*/
#define HPIC1stWr 0          /*Write first byte */
#define HPIC2ndWr 1          /*Write second byte*/
#define HPIC1stRd 2          /*Read first byte*/
#define HPIC2ndRd 3          /*Read second byte*/
/*Data transfer with Post increment after read and preincrement before write.*/
#define HPI1stWr 4           /*Write first byte */
#define HPI2ndWr 5           /*Write second byte*/
#define HPI1stRd 6           /*Read first byte*/
#define HPI2ndRd 7           /*Read second byte*/
        /*Address Register*/
#define HPIA1stWr 8          /*Write first byte */
#define HPIA2ndWr 9          /*Write second byte*/
#define HPIA1stRd 10          /*Read first byte*/
#define HPIA2ndRd 11          /*Read second byte*/
        /*Data Latches*/
#define HPIDL1stWr 12         /*Write first byte */
#define HPIDL2ndWr 13          /*Write second byte*/
#define HPIDL1stRd 14         /*Read first byte*/
#define HPIDL2ndRd 15         /*Read second byte*/
   
void AC48xDeviceReset()
{
  unsigned long para;
  ioctl(fd,DEVICE_RESET,&para);
}

void AC48xDeviceWriteByte(void *AC48xPtr,unsigned long cmd,unsigned char data)
{
  ioctl(fd,cmd,&data);
}

unsigned char AC48xDeviceReadByte(void *AC48xPtr,unsigned long cmd)
{
  unsigned char data;
  ioctl(fd,cmd,&data);
  return data;
}

int main()
{

  unsigned short addr=0x1000;

 

  fd=open("/dev/dsp",O_RDWR);
  printf("fd=%d\n",fd);

  AC48xDeviceReset();    //Reset



  AC48xDeviceWriteByte(0,HPIA1stWr,(addr-1)>>8); //Write starting  addr 0x1000
  AC48xDeviceWriteByte(0,HPIA2ndWr,(addr-1) & 0xff);

  {
    unsigned short buf[256];
    int i;
    for(i=0;i<=0xff;i++)buf[i]=(i<<8)|(0xff-i);
  
    write(fd,buf,256*sizeof(unsigned short));

  }

  AC48xDeviceWriteByte(0,HPIA1stWr,addr>>8);
  AC48xDeviceWriteByte(0,HPIA2ndWr,addr & 0xff);

  {
    int i;
    unsigned short buf[256];
    read(fd,buf,256*2);
    for(i=0; i<=0xff;i++)printf("%x\n",buf[i]);

  }

 
  return 0;
}