ad7705 2.c

单片机实现AD7705采集

void select7705(uchar partnumber)

{

   switch(partnumber)

   {

     case 1:PA18155=PA18155&0xfd;break;

     case 2:PA18155=PA18155&0xf7;break;

     default:break;

   }

}



void unselect7705(void)

{

   PA18155=PA18155|0x0f;

}



void write_bit7705(uchar w_bit)

{

  if(w_bit==0)

    DIN7705=0;

  else

    DIN7705=1;

  SCLK7705=0;

  SCLK7705=1;

}



uchar read_bit7705(void)

{

  uchar r_bit;

  SCLK7705=0;

  SCLK7705=1;

  if(DOUT7705==0)

    r_bit=0x00;

  else

    r_bit=0x80;

  return(r_bit);

}



void write_part7705(uchar w_data)

{

  uchar index;

  uchar param;

  SCLK7705=1;

  for (index = 0; index<8; index++) /* Write out data */

  {

    param = w_data<<index;

    param &= 0x80;

    write_bit7705(param);

  }

}



uchar read_part7705(void)

{

  uchar index;

  uchar r_data=0;

  SCLK7705=1;

  for (index = 0; index<8; index++) /* Write out data */

  {

    r_data |= read_bit7705()>>index;

  }

  return(total_data+all_data;

  }

  sample_mv=(int)((total_data>>3)-32768);

  unselect7705();

  return(sample_mv);

}



void ad7705s(uchar mode,uchar partnumber,uchar channel)

{

   uchar i;

   uchar j;

   dog();

   select7705(partnumber);

   write_part7705(channel | 0x20);

   write_part7705(0x0c);

   write_part7705(channel | 0x10);

   write_part7705(mode);

   wait7705(channel);

   write_part7705(channel | 0x60);

   j=(partnumber-1)*3+channel*3;

   for(i=0;i<3;i++)

   {

     write_part7705(ad7705jzdata[j+i]);

   }

   unselect7705();

}



void ad7705z(uchar mode,uchar partnumber,uchar channel,uchar x,uchar y)

{

   uchar i;

   uchar j;

   uchar m;

   dog();

   select7705(partnumber);

   write_part7705(channel | 0x10);

   write_part7705(mode);

   wait7705(channel);

   write_part7705(channel | 0x68);

   for(i=0;i<3;i++)

   {

     m=read_part7705();

     j=x+i*0x06;

     showys(m,j,y,1);

   }

   unselect7705();

}

/*----------------AD7705------------------*/