Blink and LED & Display status on LCD display

led_blink.c

// led_blink.c
// for NerdKits with ATmega168
// [email protected]
// modifications by Roland Tanglao for Mac Serial port in Makefile and 
// to display status on LCD

#define F_CPU 14745600

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <inttypes.h>

#include "../libnerdkits/delay.h"
#include "../libnerdkits/lcd.h"

// PIN DEFINITIONS:
//
// PC4 -- LED anode

int main() {
  lcd_init();
  FILE lcd_stream = FDEV_SETUP_STREAM(lcd_putchar, 0, _FDEV_SETUP_WRITE);
  lcd_home();
  lcd_write_string(PSTR("Hello LED!"));
  // LED as output
  DDRC |= (1<<PC4);
  
  // loop keeps looking forever
  while(1) {
    lcd_home();
    lcd_line_two();
    lcd_write_string(PSTR("LED ON "));
    // turn on LED
    PORTC |= (1<<PC4);

    //delay for 500 milliseconds to let the light stay on
    delay_ms(500);

    lcd_home();
    lcd_line_two();
    lcd_write_string(PSTR("LED OFF"));
    // turn off LED
    PORTC &= ~(1<<PC4);

    //delay for 500 milliseconds to let the light stay off
    delay_ms(500);
   
  }
  
  return 0;
}

Makefile

GCCFLAGS=-g -Os -Wall -mmcu=atmega168 
LINKFLAGS=-Wl,-u,vfprintf -lprintf_flt -Wl,-u,vfscanf -lscanf_flt -lm
AVRDUDEFLAGS=-c avr109 -p m168 -b 115200 -P /dev/cu.PL2303-00001004
LINKOBJECTS=../libnerdkits/delay.o ../libnerdkits/lcd.o ../libnerdkits/uart.o

all:	led_blink-upload

led_blink.hex:	led_blink.c
	make -C ../libnerdkits
	avr-gcc ${GCCFLAGS} ${LINKFLAGS} -o led_blink.o led_blink.c ${LINKOBJECTS}
	avr-objcopy -j .text -O ihex led_blink.o led_blink.hex
	
led_blink.ass:	led_blink.hex
	avr-objdump -S -d led_blink.o > led_blink.ass
	
led_blink-upload:	led_blink.hex
	avrdude ${AVRDUDEFLAGS} -U flash:w:led_blink.hex:a