testtda7540.c

基于tda7540芯片的FM芯片

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/soundcard.h>
#include <unistd.h>
#include <stdlib.h>

#include "tda7540_ioctl_cmd.h"

#define SIZE 16         /* quantize bits */
#define FREQUENCE 6250  /* sample frequence */
#define CHANNELS 1      /* number of channels */


int main(int argc,char *argv[])
{
   int fd = -1;
   int audio_fd = -1;
   unsigned long int freq=106100;
   int arg;
   int status;


   fd=open("/dev/tda7540",O_RDWR);
   audio_fd=open("/dev/dsp",O_RDWR);
   
   if(audio_fd < 0)
   {
       printf("\nopen audio device failure\n");
       return -1;
   }

   arg=SIZE;
   status=ioctl(audio_fd,SOUND_PCM_WRITE_BITS,&arg);   
   if(status == -1)
   {
         perror("SOUND_PCM_WRITE_BITS IOCTL FAILED\n");
         return -1;
   }   
   if(arg!=SIZE)
   {
         perror("unable to set sample size");
         return -1;
   }

   arg=CHANNELS;
//   printf("\narg=%d\n",arg);
   status=ioctl(audio_fd,SOUND_PCM_WRITE_CHANNELS,&arg);

//   printf("\nstatus=%d\n",status);
   if(status==-1)
   {
         perror("SOUND_PCM_WRITE_CHANNELS ioctl failed");
         //return -1;
   }
   if(arg != CHANNELS)
   {
         perror("unable to set number of channels");
         return -1;
   }

   arg=FREQUENCE;
   status=ioctl(audio_fd,SOUND_PCM_WRITE_RATE,&arg);
   if(status==-1)
   {
         perror("SOUND_PCM_WRITE_RATE IOCTL FAILED\n");
         return -1;
   }

//printf("===================run tda7540===========================\n");

   if(fd<0)
   {
     printf("\nopen failure\n ");
   }
   else
   {
//     printf("open successfully!\n");
     if(argc>1)
     {
       freq=atoi(argv[1]);
     }
     ioctl(fd,TDA7540_INIT);
     ioctl(fd,TDA7540_SET_FREQ,&freq);
     //ioctl(fd,TDA7540_GET_FREQ,&freq);
//     printf("\nread freq=%x\n",freq);
//     printf("excute successfully!\n");
   }

   close(audio_fd);
   close(fd);

   return 0;
}