windows-server-2003/drivers/wdm/capture/mini/bt848/tuner.cpp

// $Header: G:/SwDev/WDM/Video/bt848/rcs/Tuner.cpp 1.8 1998/05/07 15:24:56 tomz Exp $

extern "C" {
#include <strmini.h>
#include <wdm.h>
#include <windef.h>
}

#include "device.h"

#define PICTURE_INTERMEDIATE_FREQUENCY 45750000L

const BAND_LOW    =  55250000;    //  55.25 MHz
const BAND_LOWMID = 160000000;    // 160.00 MHz
const BAND_MIDHI  = 454000000;    // 454.00 MHz
const BAND_HI     = 801250000;    // 801.25 MHz

int PsDevice::GetPllOffset( PULONG busy, ULONG &lastFreq )
{
   lastFreq = LastFreq_;
   
   BYTE status = 0;
   I2CHWRead( TunerInfo.TunerI2CAddress, &status );
   DebugOut((1, "Tuner - status(%x)\n", status));
   if ( status & 0x40 ) {
      *busy = false;
      switch ( status & 0x07 ) {
      case 0:     // carrier sensed, need to lower frequency
         DebugOut((1, "Tuner: -2 (carrier sensed, need to lower frequency)\n"));
         return -2;
      case 1:     // carrier sensed, need to lower frequency
         DebugOut((1, "Tuner: -1 (carrier sensed, need to lower frequency)\n"));
         return -1;
      case 2:     // carrier sensed, we are on correct frequency
         DebugOut((1, "Tuner: 0 (carrier sensed, we are on correct frequency)\n"));
         return 0;
      case 3:     // carrier sensed, need to raise frequency
         DebugOut((1, "Tuner: 1 (carrier sensed, need to raise frequency)\n"));
         return 1;
      case 4:     // carrier not sensed
      default:
         DebugOut((1, "Tuner: 2 (carrier not sensed)\n"));
         return 2;
      } // switch
   }
   DebugOut((1, "Tuner: busy - return 0\n"));
   *busy = true;
   return 0;
}

void PsDevice::SetChannel( long lFreq )
{
   // Set the video carrier frequency
   // by controlling the programmable divider
   //
   // N = (16 * (FreqRF + FreqIntermediate)) / 1e6
   //

   LastFreq_ = lFreq;

   LONGLONG lTemp = lFreq;
   WORD wCtrl=0;
   lTemp = (lTemp + PICTURE_INTERMEDIATE_FREQUENCY) * 16;
   lTemp /= 1000000;

   // Set the band register
   if ( lFreq >= BAND_LOW && lFreq <= BAND_LOWMID )
   {
      wCtrl = TunerInfo.TunerBandCtrlLow;
   }
   else if ( lFreq > BAND_LOWMID && lFreq <= BAND_MIDHI )
   {
      wCtrl = TunerInfo.TunerBandCtrlMid;
   }
   else if ( lFreq > BAND_MIDHI && lFreq <= BAND_HI)
   {
      wCtrl = TunerInfo.TunerBandCtrlHigh;
   }

   // write HIWORD to I2C
   I2CHWWrite3( TunerInfo.TunerI2CAddress, HIBYTE( WORD( lTemp ) ), LOBYTE( WORD( lTemp ) ) );

   // write LOWORD to I2C
   I2CHWWrite3( TunerInfo.TunerI2CAddress, HIBYTE( wCtrl ), LOBYTE( wCtrl ) );
}