87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
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// $Header: G:/SwDev/WDM/Video/bt848/rcs/Tuner.cpp 1.8 1998/05/07 15:24:56 tomz Exp $
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extern "C" {
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#include <strmini.h>
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#include <wdm.h>
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#include <windef.h>
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}
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#include "device.h"
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#define PICTURE_INTERMEDIATE_FREQUENCY 45750000L
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const BAND_LOW = 55250000; // 55.25 MHz
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const BAND_LOWMID = 160000000; // 160.00 MHz
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const BAND_MIDHI = 454000000; // 454.00 MHz
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const BAND_HI = 801250000; // 801.25 MHz
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int PsDevice::GetPllOffset( PULONG busy, ULONG &lastFreq )
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{
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lastFreq = LastFreq_;
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BYTE status = 0;
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I2CHWRead( TunerInfo.TunerI2CAddress, &status );
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DebugOut((1, "Tuner - status(%x)\n", status));
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if ( status & 0x40 ) {
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*busy = false;
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switch ( status & 0x07 ) {
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case 0: // carrier sensed, need to lower frequency
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DebugOut((1, "Tuner: -2 (carrier sensed, need to lower frequency)\n"));
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return -2;
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case 1: // carrier sensed, need to lower frequency
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DebugOut((1, "Tuner: -1 (carrier sensed, need to lower frequency)\n"));
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return -1;
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case 2: // carrier sensed, we are on correct frequency
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DebugOut((1, "Tuner: 0 (carrier sensed, we are on correct frequency)\n"));
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return 0;
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case 3: // carrier sensed, need to raise frequency
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DebugOut((1, "Tuner: 1 (carrier sensed, need to raise frequency)\n"));
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return 1;
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case 4: // carrier not sensed
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default:
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DebugOut((1, "Tuner: 2 (carrier not sensed)\n"));
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return 2;
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} // switch
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}
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DebugOut((1, "Tuner: busy - return 0\n"));
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*busy = true;
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return 0;
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}
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void PsDevice::SetChannel( long lFreq )
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{
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// Set the video carrier frequency
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// by controlling the programmable divider
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//
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// N = (16 * (FreqRF + FreqIntermediate)) / 1e6
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//
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LastFreq_ = lFreq;
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LONGLONG lTemp = lFreq;
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WORD wCtrl=0;
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lTemp = (lTemp + PICTURE_INTERMEDIATE_FREQUENCY) * 16;
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lTemp /= 1000000;
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// Set the band register
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if ( lFreq >= BAND_LOW && lFreq <= BAND_LOWMID )
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{
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wCtrl = TunerInfo.TunerBandCtrlLow;
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}
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else if ( lFreq > BAND_LOWMID && lFreq <= BAND_MIDHI )
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{
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wCtrl = TunerInfo.TunerBandCtrlMid;
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}
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else if ( lFreq > BAND_MIDHI && lFreq <= BAND_HI)
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{
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wCtrl = TunerInfo.TunerBandCtrlHigh;
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}
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// write HIWORD to I2C
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I2CHWWrite3( TunerInfo.TunerI2CAddress, HIBYTE( WORD( lTemp ) ), LOBYTE( WORD( lTemp ) ) );
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// write LOWORD to I2C
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I2CHWWrite3( TunerInfo.TunerI2CAddress, HIBYTE( wCtrl ), LOBYTE( wCtrl ) );
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}
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