Secrets

secrets.c

#include <avr/io.h>
#include <util/delay.h>
 
#define output(directions,pin) (directions |= pin)
#define set(port,pin) (port |= pin)
#define clear(port,pin) (port &= (~pin))
#define pin_test(pins,pin) (pins & pin)
#define bit_test(byte,bit) (byte & (1 << bit))
#define led_delay() _delay_ms(500)
 
#define led_port PORTC
#define led_direction DDRC
#define led_pin (1 << PC7)
 
int main(void) {
  CLKPR = (1 << CLKPCE);
  CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0);
   
  clear(led_port, led_pin);
  output(led_direction, led_pin);
 
  while(1) {
    set(led_port, led_pin);
    led_delay();
    clear(led_port, led_pin);
    led_delay();
  }
  return 0;
}

secrets.c.make

PROJECT=secrets
SOURCES=$(PROJECT).c
MMCU=atmega32u4
F_CPU = 8000000

CFLAGS=-mmcu=$(MMCU) -Wall  -Os -DF_CPU=$(F_CPU)

$(PROJECT).hex: $(PROJECT).out
	avr-objcopy -O ihex $(PROJECT).out $(PROJECT).c.hex;\
	avr-size --mcu=$(MMCU) --format=avr $(PROJECT).out

$(PROJECT).out: $(SOURCES)
	avr-gcc $(CFLAGS) -I./ -o $(PROJECT).out $(SOURCES)

program-ice: $(PROJECT).hex
	avrdude -p m32u4 -P usb -c atmelice_isp -U flash:w:$(PROJECT).c.hex

program-fuses:
	avrdude -p m32u4 -c atmelice_isp -P usb -U lfuse:w:0x5e:m -U hfuse:w:0x99:m -U efuse:w:0xf3:m