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PICDEM™ 17 Demonstration Board User’s Guide
DS39024B-page 46 2001 Microchip Technology Inc.
E_PIN = 1; // Clock cmd in
DelayFor18TCY();
E_PIN = 0;
#endif
#ifdef BIT8 // 8-bit interface
TRIS_DATA_PORT = 0xff;// Make data port input
#else // 4-bit interface
#ifdef UPPER // Upper nibble
interface
TRIS_DATA_PORT |= 0xf0; // Make data nibble
input
#else // Lower nibble
interface
TRIS_DATA_PORT |= 0x0f; // Make data nibble
input
#endif
#endif
// Set data interface width, # lines, font
while(BusyXLCD()); // Wait if LCD busy
WriteCmdXLCD(lcdtype); // Function set cmd
// Turn the display on then off
while(BusyXLCD()); // Wait if LCD busy
WriteCmdXLCD(DOFF&CURSOR_OFF&BLINK_OFF);// Display OFF/Blink
OFF
while(BusyXLCD()); // Wait if LCD busy
WriteCmdXLCD(DON&CURSOR_ON&BLINK_ON);// Display ON/Blink ON
// Clear display
while(BusyXLCD()); // Wait if LCD busy
WriteCmdXLCD(0x01); // Clear display
// Set entry mode inc, no shift
while(BusyXLCD()); // Wait if LCD busy
WriteCmdXLCD(SHIFT_CUR_LEFT);// Entry Mode
// Set DD Ram address to 0
while(BusyXLCD()); // Wait if LCD busy
SetDDRamAddr(0); // Set Display data
ram address to 0
return;
}
/
*******************************************************************
*
* Function Name: WriteCmdXLCD
* Return Value: void
* Parameters: cmd: command to send to LCD
* Description: This routine writes a command to the Hitachi
* HD44780 LCD controller. The user must check
* to see if the LCD controller is busy before
* calling this routine.
*******************************************************************
*/
void WriteCmdXLCD(static unsigned char cmd)