Arizona 17 Network Card User Manual


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2001 Microchip Technology Inc. DS39024B-page 45
LCD.C Description
// Setup interface to LCD
#ifdef BIT8 // 8-bit interface
DATA_PORT = 0b00110000; // Function set
cmd(8-bit interface)
#else // 4-bit interface
#ifdef UPPER // Upper nibble
interface
DATA_PORT &= 0x0f; // Function set
cmd(4-bit interface)
DATA_PORT |= 0b00110000;
#else // Lower nibble
interface
DATA_PORT &= 0xf0; // Function set
cmd(4-bit interface)
DATA_PORT |= 0b00000011;
#endif
#endif
E_PIN = 1; // Clock the cmd in
DelayFor18TCY();
E_PIN = 0;
// Delay for at least 100us
DelayXLCD();
// Setup interface to LCD
#ifdef BIT8 // 8-bit interface
DATA_PORT = 0b00110000; // Function set
cmd(8-bit interface)
#else // 4-bit interface
#ifdef UPPER // Upper nibble
interface
DATA_PORT &= 0x0f; // Function set
cmd(4-bit interface)
DATA_PORT |= 0b00110000;
#else // Lower nibble
interface
DATA_PORT &= 0xf0; // Function set
cmd(4-bit interface)
DATA_PORT |= 0b00000011;
#endif
#endif
E_PIN = 1; // Clock cmd in
DelayFor18TCY();
E_PIN = 0;
DelayXLCD();
#ifndef BIT8
#ifdef UPPER // Upper nibble
interface
DATA_PORT &= 0x0f; // Function set
cmd(4-bit interface)
DATA_PORT |= 0b00100000;
#else // Lower nibble
interface
DATA_PORT &= 0xf0; // Function set
cmd(4-bit interface)
DATA_PORT |= 0b00000010;
#endif
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