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122 lines
3.5 KiB
122 lines
3.5 KiB
// $Header: G:/SwDev/WDM/Video/bt848/rcs/Bti2c.h 1.4 1998/04/29 22:43:27 tomz Exp $
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#ifndef __I2C_H
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#define __I2C_H
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#include "regField.h"
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#include "viddefs.h"
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#include "retcode.h"
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#include "i2cerr.h"
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//#define HAUPPAUGEI2CPROVIDER
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#ifdef HAUPPAUGEI2CPROVIDER
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// #include "hcwWDM.h"
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// Need to define for brooktree i2c calls
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/* Type: Level
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* Purpose: used to define a pin state
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*/
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typedef enum { LevelLow, LevelHi } Level;
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#endif
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/////////////////////////////////////////////////////////////////////////////
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// CLASS I2C
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//
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// Description:
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// This class encapsulates the register fields in the I2C register of the
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// Bt848. A complete set of functions are developed to manipulate all the
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// register fields in the I2C for the Bt848.
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//
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/////////////////////////////////////////////////////////////////////////////
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class I2C
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{
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private:
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// define which mode the I2C is selected
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enum I2CMode { I2CMode_None, I2CMode_HW, I2CMode_SW };
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bool initOK; // initialization is successful?
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DWORD cycle; // software control of frequency
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int errNum; // error number
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I2CMode mode; // which mode the I2C is running in
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//**************************************************************************
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// Structures
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//**************************************************************************
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union shadow
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{
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struct _i2c_reg // I2C register structure
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{
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unsigned int sda:1;
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unsigned int scl:1;
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unsigned int w3b:1;
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unsigned int sync:1;
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unsigned int div:4;
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unsigned int byte2:8;
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unsigned int byte1:8;
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unsigned int addr_rw:8;
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} i2cShadow;
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DWORD Initer;
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} sh;
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protected:
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RegisterDW decRegINT_STAT;
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RegField decFieldI2CDONE;
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RegField decFieldRACK;
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RegisterDW decRegI2C;
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RegField decFieldI2CDB0;
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RegField decFieldI2CDB1;
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RegField decFieldI2CDB2;
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RegField decFieldI2CDIV;
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RegField decFieldSYNC;
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RegField decFieldW3B;
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RegField decFieldSCL;
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RegField decFieldSDA;
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public:
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// constructor and destructor
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I2C( void );
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~I2C();
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// member functions
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bool IsInitOK( void );
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#ifdef HARDWAREI2C
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ErrorCode I2CInitHWMode( long freq );
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int I2CReadDiv( void );
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ErrorCode I2CHWRead( BYTE address, BYTE *value );
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ErrorCode I2CHWWrite2( BYTE address, BYTE value1 );
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ErrorCode I2CHWWrite3( BYTE address, BYTE value1, BYTE value2 );
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ErrorCode I2CSetSync( State );
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int I2CReadSync( void );
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#endif
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void I2CSetFreq( long freq );
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int I2CGetLastError( void );
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#ifdef HAUPPAUGEI2CPROVIDER
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ErrorCode I2CInitSWMode( long freq );
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ErrorCode I2CSWStart( void );
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ErrorCode I2CSWStop( void );
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ErrorCode I2CSWRead( BYTE * value );
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ErrorCode I2CSWWrite( BYTE value );
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ErrorCode I2CSWSendACK( void );
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ErrorCode I2CSWSendNACK( void );
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ErrorCode I2CSWSetSCL( Level );
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int I2CSWReadSCL( void );
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ErrorCode I2CSWSetSDA( Level );
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int I2CSWReadSDA( void );
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#endif
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private:
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void I2CResetShadow( void ); // reset register shadow
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ErrorCode I2CHWWaitUntilDone( int ); // wait until I2C completes operation
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bool I2CHWIsDone( void ); // check interrupt bit for operation done
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bool I2CHWReceivedACK( void ); // check interrupt bit for received ACK
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void I2CSWBitDelay( void ); // insert delay to simulate frequency
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ErrorCode I2CSWWaitForACK( void ); // wait for ACK from receiver using software
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};
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#endif // __I2C_H
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