tda7313.c

这是用Ｗ７７Ｅ５８编写的控制ＧＳＭ模块

/* YuanGao electronic designe co.ldt
   (c) Copyright 2000,2001, All Rights Reserved  */

#include "global.h"
#include "util.h"
#include "i2c.h"
#include "tda7313.h"


#define     TDA7313_address   0x88
#define     VOL_control       0x00              /* 0x00 is large ;0x3f is smell */


#define     SPEAKER_ATT_LR    0xC0
#define     SPEAKER_ATT_RR    0xE0
#define     SPEAKER_ATT_LF    0x80
#define     SPEAKER_ATT_RF    0xA0
#define     AUDIO_SW          0x40


unsigned char  idata volume_level;
unsigned char  treble_level;
unsigned char  loudness_sw;
unsigned char  loudness_level;
#define        LOUDNESS_OFF    0x04

unsigned char code vol_cont_table[]  ={0x3F,0x3D,0x3B,0x39,0x37,0x35,0x33,0x31,
                                       0x2F,0x2D,0x2B,0x29,0x27,0x25,0x23,0x21,
                                       0x1F,0x1D,0x1B,0x19,0x17,0x15,0x13,0x11,
                                       0x0F,0x0D,0x0B,0x09,0x07,0x05,0x03,0x00};


void Audio_Input_Switch(unsigned char AUDSW)
{

           if(loudness_sw){
              AUDSW &= LOUDNESS_OFF;
           }
           else  AUDSW |= LOUDNESS_OFF;

           write_i2c(TDA7313_address,AUDIO_SW|AUDSW); 
       
}

void Volume_Control(unsigned char vol_data)
{
          //unsigned char vol;
          BYTE vol;
          if(vol_data >= 32) return;

          vol = vol_cont_table[vol_data];      
          write_i2c(TDA7313_address,vol);
}

#if 0
void Speaker_Attenuators(unsigned char SP_n,unsigned char sp_data)
{

          unsigned char speaker_att;
          unsigned char speaker_n;

          speaker_n = SP_n;

          if(sp_data >= 40) {
              sp_data = 0x1f;   /*mute*/
          }
          else
            speaker_att = speaker_n | ((sp_data/8)<<3) | (sp_data%8);

          write_i2c(TDA7313_address,speaker_att);



}

#endif