//reset LCD to 8bit mode
void HD44780_Reset(void){
//set initial pin states
//we use open drain with pullup resistors to interface the LCD at 5volts
//all I/O should be to ground, low to start
//all to low for ground on TRIS clear
PORTB &=(~0b1111); //clear B bits (B765)
PORTD &=(~0b11); //clear D bits (RS/RW)
PORTE &=(~0b111111); //clear the E bits (E01234)
//all start output/low, 0 on HD44780 pins
TRISB &=(~0b1111); //clear B bits (B765)
TRISD &=(~0b11); //clear D bits (RS/RW)
TRISE &=(~0b111111); //clear the E bits (E01234)
//# Wait more than 15 msecs after power is applied.
delayMS(15);
//# Write 0x30 to LCD and wait 5 msecs for the instruction to complete
HD44780_WriteByte(COMMAND, 0x30);
delayMS(5);
//# Write 0x30 to LCD and wait 160 usecs for instruction to complete
HD44780_WriteByte(COMMAND, 0x30);
delayUS(160);
//# Write 0x30 AGAIN to LCD and wait 160 usecs (or poll the Busy Flag)
HD44780_WriteByte(COMMAND, 0x30);
delayUS(160);
}
//write this byte value to LCD as ascii text
//output an 8bit/byte decimal value to the LCD
void LCD_WriteByteVal(unsigned char c){
unsigned char d,j,m,k=0;
d=100;
for(j=0; j<2; j++){
m=c/d;
if(k || m){
HD44780_WriteByte(DATA, m + '0');
c = c - (m*d);
k=1;
}
d/=10;
}
HD44780_WriteByte(DATA, c + '0');
}
//blink and underline share a command byte,
//we need to remember them so we can keep the correct setting on one when we update the other
void LCD_BlinkCursor(unsigned char blink){
LCDdisplayControl.blink=blink; //store the setting
blink=CMD_DISPLAYCONTROL + DISPLAYON; //setup the command
if(LCDdisplayControl.cursor) blink+=CURSORON; //set cursor bit
if(LCDdisplayControl.blink) blink+=BLINKON; //set blink bit
HD44780_WriteByte(COMMAND, blink); //send command
delayUS(40);//delay
}
//same as LCD_BlinkCursor(), different bit
void LCD_UnderlineCursor(unsigned char cursor){
LCDdisplayControl.cursor=cursor;
cursor=CMD_DISPLAYCONTROL + DISPLAYON;
if(LCDdisplayControl.cursor) cursor+=CURSORON;
if(LCDdisplayControl.blink) cursor+=BLINKON;
HD44780_WriteByte(COMMAND, cursor);
delayUS(40);//delay
}
//initialize LCD with standard features
void HD44780_Init(void){
//Function set
HD44780_WriteByte(COMMAND, (CMD_FUNCTIONSET + DATAWIDTH8 + FONT5X7 + DISPLAYLINES2)); //0x28, 0b101000
delayMS(15);//delay 15ms
//Turn display off
HD44780_WriteByte(COMMAND, CMD_DISPLAYCONTROL + DISPLAYOFF + CURSOROFF + BLINKOFF);//0x08, 0b1000
delayMS(15);//delay 15ms
//Clear LCD and return home
HD44780_WriteByte(COMMAND, CMD_CLEARDISPLAY);
delayMS(15);//delay 15ms
//Turn on display, turn off cursor and blink
HD44780_WriteByte(COMMAND, CMD_DISPLAYCONTROL + DISPLAYON + CURSOROFF + BLINKOFF); // 0x0f, 0b1111
delayMS(15);//delay 15ms
LCDdisplayControl.cursor=CURSOROFF;
LCDdisplayControl.blink=BLINKOFF;
}
//
//functions
//
//reset LCD to 8bit mode
void HD44780_Reset(void){
//set initial pin states
//we use open drain with pullup resistors to interface the LCD at 5volts
//all I/O should be to ground, low to start
//all to low for ground on TRIS clear
LCD_PIN_SETUP();
//# Wait more than 15 msecs after power is applied.
delayMS(15);
//# Write 0x30 to LCD and wait 5 msecs for the instruction to complete
HD44780_WriteByte(COMMAND, 0x30);
delayMS(5);
//# Write 0x30 to LCD and wait 160 usecs for instruction to complete
HD44780_WriteByte(COMMAND, 0x30);
delayUS(160);
//# Write 0x30 AGAIN to LCD and wait 160 usecs (or poll the Busy Flag)
HD44780_WriteByte(COMMAND, 0x30);
delayUS(160);
}
//set position, with compensation for actual LCD layout
//this is used to align character 21 with line 2 postion 1, instead of the default line 3.
void LCD_CursorPosition(unsigned char c){
cursorPosition=c;
//calculate actual cursor position value
if(c>=1 && c<=20){
c--;
}else if (c>=21 && c<=40){
c+=43;
}else if (c>=41 && c<=60){
c-=21;
}else if (c>=61){
c+=23;
}
HD44780_WriteByte(COMMAND, CMD_SETDDRAMADDR | c);
}
//this function sends text to the LCD, with compensation for non-linearity
//write a character to the LCD with wrap to the next line
void LCD_WriteChar(char c){
HD44780_WriteByte(DATA, c);
//wrap the cursor at the end of the line
//1-20, line 1, 0x00-0x13
//21-40, line 2, 0x40-0x53
//41-60, line 3, 0x14-0x27 (20)
//61-80, line 4, 0x54-0x67
cursorPosition++;
if (cursorPosition==21 || cursorPosition==41 || cursorPosition==61){
LCD_CursorPosition(cursorPosition);
}else if (cursorPosition==81){
cursorPosition=0;
LCD_CursorPosition(cursorPosition);
}
}
void LCD_WriteINT(u16 value)
{
unsigned int temp,dvd=10000;
char i=0,k=0;
temp = value;
for (i=0;i<5;i++)
{
temp=value/dvd;
if(temp)k++;
if(k)HD44780_WriteByte(DATA, temp + '0');
value = value - (temp*dvd);
dvd/=10;
}
}
void HD44780_WriteCommand(char dat)
{
HD44780_WriteByte(HD44780_REGISTER_COMMAND, dat);
delay2MiliSecond();
}
//write a string to the LCD
//curser position is not tracked....
void LCD_WriteString(char *s) //other processors
{
char c;
while((c = *s++)) HD44780_WriteByte(DATA, c);
}
//return cursor to home
void LCD_Home(void){
HD44780_WriteByte(COMMAND,CMD_RETURNHOME);
cursorPosition=1; //cursor is positioned at home
delayMS(2);//delay 15ms
}
//Clear LCD and return home
void LCD_Clear(void){
HD44780_WriteByte(COMMAND, CMD_CLEARDISPLAY);
cursorPosition=1; //cursor is positioned at home
delayMS(15);//delay 15ms
}
void HD44780_WriteData(char dat)
{
HD44780_WriteByte(HD44780_REGISTER_DATA, dat);
delay50MicroSecond();
}
//no cursor compensation, for CGRAM
void LCD_WriteRAM(char c){
HD44780_WriteByte(DATA, c);
delayUS(46);
}
//write to character generator RAM
void LCD_WriteCGRAM(char c){
c*=8;
HD44780_WriteByte(COMMAND, CMD_SETCGRAMADDR + c);
delayUS(46);
}
void LCD_WriteString(rom char *s) //for 18F
{
char c;
while((c = *s++)) HD44780_WriteByte(DATA, c);
}
