avr/ws2812/src/main.c

#include <avr/io.h>
#include <util/delay.h>
#include "ws2812.h"
#include "np_common.c"

#include <simavr/avr/avr_mcu_section.h>
AVR_MCU(F_CPU, "attiny85");

const struct avr_mmcu_vcd_trace_t _mytrace[]  _MMCU_ = {
   { AVR_MCU_VCD_SYMBOL("DDRB"), .what = (void*)&DDRB, },
   { AVR_MCU_VCD_SYMBOL("PORTB"), .what = (void*)&PORTB, },
};

#define PIXEL_COUNT 7
/*
const uint8_t pixels_0[PIXEL_COUNT * 3] =
    { 255,   0, 255,
      255, 255,   0,
      255, 255, 255 };
      */

const uint8_t pixels_1[PIXEL_COUNT * 4] =
    {   0, 0, 0, 0,
       32, 0, 0, 0,
       64, 0, 0, 0,
       96, 0, 0, 0,
      128, 0, 0, 0,
      160, 0, 0, 0,
      192, 0, 0, 0 };

const uint8_t pixels_2[PIXEL_COUNT * 4] =
    { 0,   0, 0, 0,
      0,  32, 0, 0,
      0,  64, 0, 0,
      0,  96, 0, 0,
      0, 128, 0, 0,
      0, 160, 0, 0,
      0, 192, 0, 0 };

const uint8_t pixels_3[PIXEL_COUNT * 4] =
    { 0, 0,   0, 0,
      0, 0,  32, 0,
      0, 0,  64, 0,
      0, 0,  96, 0,
      0, 0, 128, 0,
      0, 0, 160, 0,
      0, 0, 192, 0 };

const uint8_t pixels_4[PIXEL_COUNT * 4] =
    {   0,   0,   0,   0,
        0,   0,   0,  32,
        0,   0,   0,  64,
        0,   0,   0,  96,
        0,   0,   0, 128,
        0,   0,   0, 160,
        0,   0,   0, 192 };

void blink(void) {
    PORTB |= _BV(2);
    _delay_ms(100);
    PORTB &= ~(_BV(2));
}

/*
void fade_in(const uint8_t *pixels);
void fade_out(void);

void fade_in(const uint8_t *pixels) {
    uint8_t current[PIXEL_COUNT * 4];
    for (int i = 0; i < 255; i++) {
        for (int idx = 0; idx < PIXEL_COUNT * 4; idx++) {
            if (current[idx] < pixels[idx]) {
                current[idx] += 1;
            }
        }
        write_pixels(current, PIXEL_COUNT * 4);
        _delay_ms(5);
    }
}

void fade_out() {
    uint8_t current[PIXEL_COUNT * 4];
    for (int i = 0; i < 255; i++) {
        for (int idx = 0; idx < PIXEL_COUNT * 4; idx++) {
            if (current[idx] > 0) {
                current[idx] -= 1;
            }
        }
        write_pixels(current, PIXEL_COUNT * 4);
        _delay_ms(5);
    }
}
*/

int main (void) {
    PORTB = 0;
    DDRB = _BV(0) | _BV(1) | _BV(2) | _BV(3);
    _delay_ms(50);

    blink();

    _delay_ms(500);

    /*
    while (1) {
        blink();
        write_pixels(pixels_1, PIXEL_COUNT * 4);
        _delay_ms(1000);
        write_pixels(pixels_2, PIXEL_COUNT * 4);
        _delay_ms(1000);
        write_pixels(pixels_3, PIXEL_COUNT * 4);
        _delay_ms(1000);
        write_pixels(pixels_4, PIXEL_COUNT * 4);
        _delay_ms(1000);
    }
    */


    uint8_t pixels[7 * 3];
    for (uint8_t i = 0; i < 7 * 3; i++) {
        pixels[i] = 0;
    }

    int8_t r_step = 1;
    int8_t g_step = 0;
    int8_t b_step = 0;
    while (1) {
        pixels[0] += r_step;
        pixels[3] += r_step;
        pixels[6] += r_step;
        pixels[9] += r_step;
        pixels[12] += r_step;
        pixels[15] += r_step;
        pixels[18] += r_step;
        // pixels[1] += g_step;
        // pixels[2] += b_step;
        write_pixels(pixels, 7 * 3);
        if (pixels[0] == 255) {
            r_step = -1;
        } else if (pixels[0] == 0) {
            r_step = 1;
        }
        /*
        if (pixels[0] == 255) {
            r_step = -1;
            g_step = 1;
        } else if (pixels[0] == 0 && r_step == -1) {
            r_step = 0;
        }
        */

        /*
        if (pixels[1] == 255) {
            g_step = -1;
            b_step = 1;
        } else if (pixels[1] == 0 && g_step == -1) {
            g_step = 0;
        }

        if (pixels[2] == 255) {
            b_step = -1;
            r_step = 1;
        } else if (pixels[2] == 0 && b_step == -1) {
            b_step = 0;
        }
        */
        _delay_ms(5);
    }

    return 0;
}