smcl

avr-objcopy -O ihex -R .eeprom blink blink.hex

smcl

CC = avr-gcc
PROCESSOR = atmega328p
FREQ = 16000000
AVRDUDE_CONFIG = arduino
AVRDUDE_PART = ATMEGA328P
AVRDUDE_PROGRAMMING_DEVICE = /dev/tty.usbmodem1421
AVRDUDE_BAUD = 115200

all: buildhex

smcl

avrdude -F -V -c ATMEGA328P -p arduino -P /dev/tty.usbmodem1421 -b 115200 -U flash:w:blink:e
# note: most guides will tell you to do the below, but it's not necessary
# avrdude -F -V -c ATMEGA328P -p arduino -P /dev/tty.usbmodem1421 -b 115200 -U flash:w:blink.hex

smcl

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_MOSI   9
#define OLED_CLK   10
#define OLED_DC    11
#define OLED_CS    12
#define OLED_RESET 13

smcl

$ avr-objdump -h blink

blink:     file format elf32-avr

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .data         00000000  00800100  000000b0  00000124  2**0
                  CONTENTS, ALLOC, LOAD, DATA
  1 .text         000000b0  00000000  00000000  00000074  2**1
                  CONTENTS, ALLOC, LOAD, READONLY, CODE

smcl

$ cat Makefile 
CC = avr-gcc
PROCESSOR = atmega328p
FREQ = 16000000
AVRDUDE_CONFIG = arduino
AVRDUDE_PART = ATMEGA328P
AVRDUDE_PROGRAMMING_DEVICE = /dev/tty.usbmodem1411

all: build

smcl

int boxSize = 50; 
boolean bitmap[][] = new boolean[3][8]; 

void setup() {
  size(150, 400);
  background(225, 219, 203);

  // horizontal lines
  for (int i=1; i<3; i++) { 
    line(i * boxSize, 0, i * boxSize, height);

smcl

#ifndef ARDUINO_ARCH_SAM
#include <avr/io.h>
#endif
#include <avr/pgmspace.h> 
 
#ifndef FONT5X7_H
#define FONT5X7_H

// standard ascii 5x7 font

smcl

$ avr-objdump -h blink
blink:     file format elf32-avr
Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .data         00000000  00800100  000000b0  00000124  2**0
                  CONTENTS, ALLOC, LOAD, DATA
  1 .text         000000b0  00000000  00000000  00000074  2**1
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  2 .comment      00000011  00000000  00000000  00000124  2**0
                  CONTENTS, READONLY

smcl

$ avr-objdump -h blink
blink:     file format elf32-avr
Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .data         00000004  00800100  000000c6  0000015a  2**0
                  CONTENTS, ALLOC, LOAD, DATA
  1 .text         000000c6  00000000  00000000  00000094  2**1
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  2 .eeprom       00000002  00810000  00810000  0000015e  2**0
                  CONTENTS, ALLOC, LOAD, DATA