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2001 Microchip Technology Inc. DS39024B-page 47
LCD.C Description
{
while(BusyXLCD());
#ifdef BIT8 // 8-bit interface
TRIS_DATA_PORT = 0; // Data port output
DATA_PORT = cmd; // Write command to
data port
RW_PIN = 0; // Set the control
signals
RS_PIN = 0; // for sending a com-
mand
DelayFor18TCY();
E_PIN = 1; // Clock the command
in
DelayFor18TCY();
E_PIN = 0;
DelayFor18TCY();
TRIS_DATA_PORT = 0xff;// Data port input
#else // 4-bit interface
#ifdef UPPER // Upper nibble
interface
TRIS_DATA_PORT &= 0x0f;
DATA_PORT &= 0x0f;
DATA_PORT |= cmd&0xf0;
#else // Lower nibble
interface
TRIS_DATA_PORT &= 0xf0;
DATA_PORT &= 0xf0;
DATA_PORT |= (cmd>>4)&0x0f;
#endif
RW_PIN = 0; // Set control sig-
nals for command
RS_PIN = 0;
DelayFor18TCY();
E_PIN = 1; // Clock command in
DelayFor18TCY();
E_PIN = 0;
#ifdef UPPER // Upper nibble
interface
DATA_PORT &= 0x0f;
DATA_PORT |= (cmd<<4)&0xf0;
#else // Lower nibble
interface
DATA_PORT &= 0xf0;
DATA_PORT |= cmd&0x0f;
#endif
DelayFor18TCY();
E_PIN = 1; // Clock command in
DelayFor18TCY();
E_PIN = 0;
#ifdef UPPER // Make data nibble
input
TRIS_DATA_PORT |= 0xf0;
#else
TRIS_DATA_PORT |= 0x0f;
#endif
#endif
return;
}