//reset LCD to 4bit mode
void HD44780_Reset(void){
//set initial pin states
LCD_BL_TRIS&=(~LCD_BL_PIN);//backlight pin output
LCD_BL_LAT|=LCD_BL_PIN; //backlight on
//all I/O should be to ground, low to start
TRISC&=(~0b11000000);
LATC&=(~0b11000000);
TRISD&=(~0b11111000);
LATD&=(~0b11111000);
//# Wait more than 15 msecs after power is applied.
delayMS(15);
LCD_RS=0;//0 for a command
//# Write 0x03 to LCD and wait 5 msecs for the instruction to complete
HD44780_WriteNibble(0x03);
delayMS(5);
//# Write 0x03 to LCD and wait 160 usecs for instruction to complete
HD44780_WriteNibble(0x03);
delayUS(160);
//# Write 0x03 AGAIN to LCD and wait 160 usecs (or poll the Busy Flag)
HD44780_WriteNibble(0x03);
delayUS(160);
//Set the Operating Characteristics of the LCD
//* Write 0x02 to the LCD to Enable Four Bit Mode
HD44780_WriteNibble(0x02);
delayUS(160);
}
//reset LCD to 4bit mode
void HD44780_Reset(void){
//set initial pin states
//LCD_BL_TRIS=0;//backlight pin output
//LCD_BL=0; //backlight off
//we use open drain with pullup resistors to interface the LCD at 5volts
//all I/O should be to ground, low to start
PORTB &= (~0b10111111100000);
LATB &= (~0b10111111100000);
TRISB &= (~0b10111111100000);
//# Wait more than 15 msecs after power is applied.
delayMS(15);
LCD_RS_TRIS=0;//0 for a command
//# Write 0x03 to LCD and wait 5 msecs for the instruction to complete
HD44780_WriteNibble(0x03);
delayMS(5);
//# Write 0x03 to LCD and wait 160 usecs for instruction to complete
HD44780_WriteNibble(0x03);
delayUS(160);
//# Write 0x03 AGAIN to LCD and wait 160 usecs (or poll the Busy Flag)
HD44780_WriteNibble(0x03);
delayUS(160);
//Set the Operating Characteristics of the LCD
//* Write 0x02 to the LCD to Enable Four Bit Mode
HD44780_WriteNibble(0x02);
delayUS(160);
}
//write byte dat to register reg
void HD44780_WriteByte(unsigned char reg, unsigned char dat){
LCD_RW=0; //write mode =0
if(reg==DATA){ //does RS need to be set?
LCD_RS=1; //set register select flag for text
}else{
LCD_RS=0;//0 for a command
}
HD44780_WriteNibble((dat>>4) );
HD44780_WriteNibble((dat & 0x0F));
}
