Tested Ok with
- at90s2313
- attiny2313, attiny4313
- atmega8
- atmega8u2
- atmega32u2
- atmega32u4
See hd44780.h to set HD44780 pinout.
You should copy all files in subdirectory (eg. hd44780) of your project.
/*
* 2x24 character in 4 bits mode connected as follow :
* DATA = PIN[4-7] PORTD
* ENABLE = PIN3 PORTD
* RS = PIN4 PORTC
* RW to GND
*/
#define H44780_DISPLAY_TYPE 10 /* 2x24 characters type */
#define H44780_4BITS_MODE /* 4 bits mode */
#define H44780_DATA_IS_MSB /* DATA = PIN[4-7] PORTD */
#define H44780_DISPLAY_PORT _H44780_PORTD_
#define H44780_ENABLE_PIN 3 /* ENABLE on PIN3 PORTD */
#define H44780_ENABLE_PORT _H44780_PORTD_
#define H44780_RS_PIN 4 /* RS on PIN4 PORTC */
#define H44780_RS_PORT _H44780_PORTC_
#include <avr/io.h>
#include <stdlib.h>
#include <util/delay.h>
#include "hd44780/hd44780.h"
int main(void) {
LCD_init();
LCD_puts("Hello, world!\n");
_delay_ms(1000);
LCD_clrscr();
LCD_puts(" Goodbye\n");
LCD_puts(" Cruel World! ");
while (1) {}
return 0;
}
A Makefile to build previous example.c
include hd44780/hd44780.mk
FIRMWARE = example
MCU = atmega328p
HZ = 16000000
CC = avr-gcc
OBJCOPY = avr-objcopy
CFLAGS += -Os -D F_CPU=$(HZ)
CFLAGS += -g -mmcu=$(MCU) -Wall -Wstrict-prototypes
SOURCES += example.c $(HD44780_SOURCES)
OBJECTS = example.o $(HD44780_OBJECTS)
default: $(FIRMWARE).out
$(OBJCOPY) -R .eeprom -O ihex $(FIRMWARE).out \
$(FIRMWARE).hex
$(FIRMWARE).out: $(OBJECTS)
$(CC) $(CFLAGS) -o $(FIRMWARE).out \
-Wl,-Map,$(FIRMWARE).map $(OBJECTS)
.c.o:
$(CC) $(CFLAGS) -c $< -o $@
clean:
rm -f *.o *.hex *map
- MIT license