//ADC Initialization
void Adc_Init(  )
{
   BitWrPortI( PEDR, &PEDRShadow, HIGH, CS  );  //CS high
   for( i = 0; i < 20; i++);
   BitWrPortI( PDDR, &PDDRShadow, LOW, SCLK );  //SCLK low
   BitWrPortI( PEDR, &PEDRShadow, LOW, RESET ); // reset ->low
   BitWrPortI( PEDR, &PEDRShadow, LOW, CS );    //CS low
   BitWrPortI( PEDR, &PEDRShadow, HIGH, RESET );// reset ->high

   //MsDelay( 5000 );

   Spi_Write( 0x60 );   // config0  register write command
   Spi_Write( 0x0A );   // config0 auto scan channel mode

   Spi_Write( 0x64 );   //command for MUXSG0 selection
   Spi_Write( 0x00 );   //first 8 channels disabled

   Spi_Write( 0x65 );   //command for MUXSG1 selection
   Spi_Write( 0x00 );   //last 8 channels disabled
}


//to read the ADC output
void adc_reading( unsigned long *array )
{
   unsigned char channel,i,j;
   unsigned long temp,value;
   unsigned long prevsample,sample;

   BitWrPortI( PEDR, &PEDRShadow, LOW, CS );  //CS low
   BitWrPortI( PEDR, &PEDRShadow, HIGH, RESET );// reset ->high
   for( i = 0 ; i < 10 ; i++ )
   {
      if( i == 0 || i == 8 )
         channel = 0x01;
      if( i < 8 )
      {
         Spi_Write( 0x64 );   //MUXSG0
         Spi_Write( channel );   // channel enabled
         MsDelay( 1 );

         Spi_Write( 0x65 );   //MUXSG1
         Spi_Write( 0x00 );   //last 8 channels disabled
      }
      else
      {
         Spi_Write( 0x64 );   //MUXSG0
         Spi_Write( 0x00 );   // first 8 channels disabled
         MsDelay( 1 );

         Spi_Write( 0x65 );   //MUXSG1
         Spi_Write( channel );   // channel enabled
      }
      sample = 0;
      prevsample = 0;
      for( j = 0; j < 16; j++ )
      {
         BitWrPortI( PDDR, &PDDRShadow, HIGH, START );  //start high
         BitWrPortI( PDDR, &PDDRShadow, LOW, START );  //start low
         Spi_Write( 0x30 );
         BitWrPortI( PDDR, &PDDRShadow, LOW, SCLK );  //SCLK low
         Spi_DataRead( &temp );
         MsDelay( 10);
         value = ( temp & 0xffff);

         if( value < 20000 )
            prevsample = value;
         if( value > 20000 )
            value = prevsample;

         sample = sample + value;
      }
      printf("\r\n\n %lx", temp );
      array[ i ] = sample / 16;
      channel = channel << 1;
   }
   MsDelay( 10 );
   for( i = 0; i < 10 ; i++ )
    {
      val[i] = ( array[i] * 5.3424 ) / 32767;
//      printf("\r\n\nch%d = %lx", i, array[i] );
      printf("\n\nch%d = %.2f", i, val[i] );
    }
    printf("\n\n\r");/*
}




//ADC data write
void Spi_Write( unsigned char spidata )
{
   unsigned char index,temp;

   for( index = 0, temp = spidata  ; index < 8 ; index++ )
   {
      if( temp & 0x80 )
         BitWrPortI( PDDR, &PDDRShadow, HIGH, DIN );  //DIN high
      else
         BitWrPortI( PDDR, &PDDRShadow, LOW, DIN );  //DIN low

      BitWrPortI( PDDR, &PDDRShadow, HIGH, SCLK );  //SCLK high
      BitWrPortI( PDDR, &PDDRShadow, LOW, SCLK );  //SCLK low

      temp <<= 1;
   }
}



//ADC data read
void Spi_DataRead( unsigned long *temp )
{
   unsigned char index,chno;

   for( index = 0, *temp = 0 ; index < 24 ; index++ )
   {
      *temp <<= 1;
         *temp |= BitRdPortI( PDDR, DOUT );
      BitWrPortI( PDDR, &PDDRShadow, HIGH, SCLK );  //SCLK high
      BitWrPortI( PDDR, &PDDRShadow, LOW, SCLK );  //SCLK low
   }
}