osx setup for atmega32u4 (with silly program to control 7-segment led)

7-segment.c

// 0) I have xcode installed everywhere, I'm not sure that's a dependency but...
//     I'm not going to uninstall it to test the theory
// 1) download and install crosspack: http://www.obdev.at/products/crosspack/download.html
//     (you may need to go into "security & privacy" and take osx out of nanny-mode)
// 2) with the controller unplugged open a console and type `ls /dev/tty.*`
// 3) plug it in and type `ls /dev/tty.*` again... make a note of the new device
// 4) `cd ~/Documents`
// 5) `avr-project 7-segment`
// 6) `cd 7-segment/firmware`
// 7) edit the Makefile
//        change DEVICE to: atmega32u4
//        change CLOCK to: 8000000
//        change PROGRAMMER to: -c avr109 -P the-device-name-from-step-3
// 8) edit main.c (maybe with the program below)
// 9) `make`
// 10) push the button on the controller to put it into boot mode (it should start to blink)
// 11) while it's blinking: `make flash`

#include <avr/io.h>
#include <util/delay.h>

#ifndef F_CPU
#define F_CPU 16000000UL // or whatever may be your frequency
#endif

static char segments[80] = {
    0b00000001, 0b00000010, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b10000000,
    0b00000001, 0b00000000, 0b00000100, 0b00001000, 0b00000000, 0b00100000, 0b01000000, 0b00000000,
    0b00000001, 0b00000010, 0b00000100, 0b00000000, 0b00000000, 0b00100000, 0b01000000, 0b10000000,
    0b00000001, 0b00000010, 0b00000000, 0b00000000, 0b00010000, 0b00000000, 0b01000000, 0b00000000,
    0b00000000, 0b00000010, 0b00000100, 0b00000000, 0b00010000, 0b00100000, 0b01000000, 0b10000000,
    0b00000000, 0b00000010, 0b00000100, 0b00001000, 0b00010000, 0b00100000, 0b01000000, 0b00000000,
    0b00000001, 0b00000010, 0b00000000, 0b00000000, 0b00000000, 0b00100000, 0b00000000, 0b10000000,
    0b00000001, 0b00000010, 0b00000100, 0b00001000, 0b00010000, 0b00100000, 0b01000000, 0b00000000,
    0b00000001, 0b00000010, 0b00000100, 0b00000000, 0b00010000, 0b00100000, 0b01000000, 0b10000000,
    0b00000001, 0b00000010, 0b00000100, 0b00001000, 0b00010000, 0b00100000, 0b00000000, 0b00000000
};

int main(void) {
    uint16_t i = 0;
    uint16_t t = 0;
    DDRD = 0b11111111;
    for(;;){
        PORTD = segments[(i++ % 8) + t * 8];
        _delay_ms(1);
        if(i > 1000) {
            i = 0;
            t = (t + 1) % 10;
        }
    }
    return 0;   /* never reached */
}