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/****************************************************************************
 *   Copyright (C) 2011 by Claas Anders "CaScAdE" Rathje                    *
 *   admiralcascade@gmail.com                                               *
 *   Project-URL: http://www.mylifesucks.de/oss/c-epilepsy/                 *
 *                                                                          *
 *   This program is free software; you can redistribute it and/or modify   *
 *   it under the terms of the GNU General Public License as published by   *
 *   the Free Software Foundation; either version 2 of the License.         *
 *                                                                          *
 *   This program is distributed in the hope that it will be useful,        *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *   GNU General Public License for more details.                           *
 *                                                                          *
 *   You should have received a copy of the GNU General Public License      *
 *   along with this program; if not, write to the                          *
 *   Free Software Foundation, Inc.,                                        *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
 ****************************************************************************/

#include "led_out.h"

#define ROWPORT PORTA
#define COLPORT PORTC
#define COLBASE (1 << PC2)



uint8_t col = 0;
uint8_t delay = 0;

uint8_t on = 0; // on-round or off-round

uint8_t animation[7];
volatile uint8_t animation_locked = 0;

#define TIMESON         7 // time slices to stay on
#define TIMESOFF        3 // time slices to stay off

void led_out_init() {
    DDRA |= 0xFF; // Z0-Z7 output
    DDRC |= ((1 << PC2) | (1 << PC3) | (1 << PC4) | (1 << PC5) | (1 << PC6) | (1 << PC7)); // S0-S5 output
}

void inline led_timer_callback() {
    if (!animation_locked) {
        // the Epilepsy was not build for powering the LEDs constantly, so we force a dim
        delay--;

        // only after
        if (!delay) {
            if (on) {
                // time is up, go dark
                ROWPORT = 0;
                COLPORT &= ~(COLBASE << col);

                // controll next col in next round
                col = (col + 1) % 6;

                delay = TIMESOFF;
            } else {
                COLPORT |= (COLBASE << col);

                // hardware EPI10AQ41 has the rows reversed
                // to convert old animations use
                // http://www.mylifesucks.de/tools/epireverse/
#if HWVERSION == EPI10AQ41
                uint8_t reverse = 0;
                for (uint8_t mask = 128; mask; mask >>= 1) {
                    reverse >>= 1;
                    if (animation[col] & mask) {
                        reverse |= 128;
                    }
                }
                ROWPORT = reverse;
#else
                ROWPORT = animation[col];
#endif
                delay = TIMESON;
            }

            on = !on;
        }
    }
}