/*************************************************************
cursor set
*************************************************************/
void set_curser(unsigned char temp)
{
unsigned char i = 0;
Check_LCDBusy(); // Check this spoint
i = temp;
i &= 0xF0;
WriteNibble(i);
i = temp<<4;
i &= 0xF0;
WriteNibble(i);
}
/**************************************************************
Cursor ON or OFF
**************************************************************/
void curser_ONOFF(unsigned char temp)
{
unsigned char i = 0;
i = temp;
i &= 0xF0;
WriteNibble(i);
i = temp<<4;
i &= 0xF0;
WriteNibble(i);
}
/*************************************************************
Set LCD line [ For Line 1: temp = 0x80h; Line 2: temp = C0h
**************************************************************/
void SetLine(unsigned char temp)
{
unsigned static char i = 0;
Check_LCDBusy(); // Check this spoint
i = temp;
i &= 0xF0;
WriteNibble(i);
i = temp<<4;
i &= 0xF0;
WriteNibble(i);
}
/**************************************************************
DDRAM address
**************************************************************/
void DDRAMadrs(unsigned char temp)
{
unsigned char i = 0;
i = temp;
i &= 0xF0;
WriteNibble(i);
i = temp<<4;
i &= 0xF0;
WriteNibble(i);
}
/**************************************************************
ENTRY Mode
**************************************************************/
void EntryMode(unsigned char temp)
{
unsigned char i = 0;
i = temp;
i &= 0xF0;
WriteNibble(i);
i = temp<<4;
i &= 0xF0;
WriteNibble(i);
}
/**************************************************************
Dsplay Clear
**************************************************************/
void DisplayClr(unsigned char temp)
{
unsigned char i = 0;
i = temp;
i &= 0xF0;
WriteNibble(i);
i = temp<<4;
i &= 0xF0;
WriteNibble(i);
}
/**************************************************************
function set
**************************************************************/
void FunctionSet(unsigned char temp)
{
unsigned char i = 0;
i = temp;
i &= 0xF0;
WriteNibble(i);
i = temp<<4;
i &= 0xF0;
WriteNibble(i);
}
void LCDinit(void)
{
PORTA = 00; // Clear Control port
LATA = 00; // and its corresponding Latch
TRISA = 0x01; // Make PORTA as output port
ADCON1 = 0x0E; // Make PORTA as digitital I/O
// This is done here assuming application code may be using PORTA of Analog application.
_delay(4); //
_delay(4); //
_delay(4); //~15 ms delay
WriteNibble(0x30); // #1 control byte
_delay(4);
WriteNibble(0x30); // #2 control byte
_delay_100us();
WriteNibble(0x30); // #3 control byte
_delay_100us();
WriteNibble(0x20); // #4 control sets 4 bit mode
_delay_100us();
Check_LCDBusy(); // Check whther LCD is free to continue operation
FunctionSet(0x28); // #5 control byte Function set
DisplayON (0x0D); // Turn on Display
DisplayClr (0x01); // Clear Display (clears junk if any)
EntryMode(0x06); // Entry mode selection
DDRAMadrs(0x80); // Initialise DDRAM address to 80h.
} // LCD Init ends
void CDiskImageDos::Nibblize()
{
int sector, length;
m_iGcrPos = ( MAX_TRACK_BYTES - 1 ) - ( ( m_nTrack*768 ) % MAX_TRACK_BYTES );
memset( m_abyNibBuffer, 0xFF, MAX_TRACK_BYTES );
// write gap one, which contains 48 self-sync bytes
WRITE_SYNC( 64 );
for( sector = 0; sector < 16; sector++ )
{
// write the address field, which contains:
// - PROLOGUE ( D5 AA 96 )
// - VOLUME NUMBER ("4 AND 4" ENCODED)
// - TRACK NUMBER ("4 AND 4" ENCODED)
// - SECTOR NUMBER ("4 AND 4" ENCODED)
// - CHECKSUM ("4 AND 4" ENCODED)
// - EPILOGUE ( DE AA EB )
WriteNibble(0xD5);
WriteNibble(0xAA);
WriteNibble(0x96);
#define CODE44A(a) ((((a) >> 1) & 0x55) | 0xAA)
#define CODE44B(a) (((a) & 0x55) | 0xAA )
WriteNibble( CODE44A((BYTE)m_uVolumeNo) ); // Volume = 254
WriteNibble( CODE44B((BYTE)m_uVolumeNo) );
WriteNibble( CODE44A( (BYTE)m_nTrack ) ); // track
WriteNibble( CODE44B( (BYTE)m_nTrack ) );
WriteNibble( CODE44A( sector ) ); // sector
WriteNibble( CODE44B( sector ) );
WriteNibble( CODE44A(0xFE ^ ((BYTE)m_nTrack) ^ sector) ); // checksum
WriteNibble( CODE44B(0xFE ^ ((BYTE)m_nTrack) ^ sector) );
#undef CODE44A
#undef CODE44B
WriteNibble( 0xDE );
WriteNibble( 0xAA );
WriteNibble( 0xEB );
// write gap two, which contains six self-sync bytes
WRITE_SYNC( 6 );
// write the data field, which contains
// - PROLOGUE ( D5 AA AD )
// - 343 6-BIT BYTES OF NIBBLIZED DATA, INCLUDING A 6-BIT CHECKSUM
// - EPILOGUE ( DE AA EB )
WriteNibble( 0xD5 );
WriteNibble( 0xAA );
WriteNibble( 0xAD );
Code62( sm_abySectorOrder[m_pbyLogicalOrder[sector]] ); // 343 bytes
WriteNibble( 0xDE );
WriteNibble( 0xAA );
WriteNibble( 0xEB );
// write gap three, which contains 27 self-sync bytes
WRITE_SYNC( 27 );
}
}
