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2001 Microchip Technology Inc. DS39024B-page 49
LCD.C Description
#else // Lower nibble
interface
DATA_PORT &= 0xf0; // Write lower nib-
ble
DATA_PORT |= (CGaddr&0x0f);
#endif
DelayFor18TCY();
E_PIN = 1; // Clock cmd and
address in
DelayFor18TCY();
E_PIN = 0;
#ifdef UPPER // Upper nibble
interface
TRIS_DATA_PORT |= 0xf0; // Make inputs
#else // Lower nibble
interface
TRIS_DATA_PORT |= 0x0f; // Make inputs
#endif
#endif
return;
}
/
*******************************************************************
*
* Function Name: SetDDRamAddr
* Return Value: void
* Parameters: CGaddr: display data address
* Description: This routine sets the display data address
* of the Hitachi HD44780 LCD controller. The
* user must check to see if the LCD controller
* is busy before calling this routine.
*******************************************************************
*/
void SetDDRamAddr(static unsigned char DDaddr)
{
while(BusyXLCD());
#ifdef BIT8 // 8-bit interface
TRIS_DATA_PORT = 0; // Make port output
DATA_PORT = DDaddr | 0b10000000; // Write cmd and
address to port
RW_PIN = 0; // Set the control
bits
RS_PIN = 0;
DelayFor18TCY();
E_PIN = 1; // Clock the cmd and
address in
DelayFor18TCY();
E_PIN = 0;
DelayFor18TCY();
TRIS_DATA_PORT = 0xff; // Make port input
#else // 4-bit interface
#ifdef UPPER // Upper nibble
interface
TRIS_DATA_PORT &= 0x0f; // Make port output
DATA_PORT &= 0x0f; // and write upper
nibble
DATA_PORT |= ((DDaddr | 0b10000000) & 0xf0);