#include <inttypes.h>

#include <avr/io.h>
#undef __AVR_ENHANCED__
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#define F_CPU 10.0E6 // 10 MHz
#include <avr/delay.h>

#include "data.h"

typedef uint8_t u8;

extern inline void
smalldelay(unsigned char count)
{
    unsigned char counter;
    counter = count;
    __asm__ __volatile__ (
        "\t" "dec %0" "\n"
        "\t" "brne .-4" "\n"
        : /* outputs */ "+r" (counter)
        );
}

void
bigdelay(uint8_t a)
{
    while(--a) {
        smalldelay(255);
    }
}

// 240 works well on the board, at 3.7MHz
// the internal RC oscillator runs at 1MHz, so make this 65
// CLKSEL = 0100-0010  0010
// oh, guess what, it was already using that. So 240 works for 1MHz.
#define DELAY 240
#define setb(value) PORTB = (PORTB & 0xfe) | (value & 0x01)
int
main(void)
{
    uint8_t counter = 0;
    uint8_t current;

    DDRB = 0x07;
    PORTB = 0xff;
    PORTB &= ~0x04;

    while(1) {
        PORTB ^= 0x02;
        current = pgm_read_byte_near(data + counter);
        //current = __LPM_classic__((uint16_t)(data + counter));
        counter++;
        if (counter >= sizeof(data)) {
            counter = 0;
            PORTB &= ~0x04;
        }
        // now loop through all 8 bits
        setb(current);
        current >>= 1;
        bigdelay(DELAY);

        setb(current);
        current >>= 1;
        bigdelay(DELAY);

        setb(current);
        current >>= 1;
        bigdelay(DELAY);

        setb(current);
        current >>= 1;
        bigdelay(DELAY);

        setb(current);
        current >>= 1;
        bigdelay(DELAY);

        setb(current);
        current >>= 1;
        bigdelay(DELAY);

        setb(current);
        current >>= 1;
        bigdelay(DELAY);

        setb(current);
        current >>= 1;
        bigdelay(DELAY);

        PORTB |= 0x04;
    }
}