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/****************************************************************************
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 *   Copyright (C) 2011 by Claas Anders "CaScAdE" Rathje                    *
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 *   admiralcascade@gmail.com                                               *
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 *   Project-URL: http://www.mylifesucks.de/oss/c-epilepsy/                 *
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 *                                                                          *
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 *   This program is free software; you can redistribute it and/or modify   *
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 *   it under the terms of the GNU General Public License as published by   *
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 *   the Free Software Foundation; either version 2 of the License.         *
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 *                                                                          *
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 *   This program is distributed in the hope that it will be useful,        *
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
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 *   GNU General Public License for more details.                           *
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 *                                                                          *
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 *   You should have received a copy of the GNU General Public License      *
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 *   along with this program; if not, write to the                          *
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 *   Free Software Foundation, Inc.,                                        *
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 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
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 ****************************************************************************/
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#include "led_out.h"
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#define ROWPORT PORTA
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#define COLPORT PORTC
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#define COLBASE (1 << PC2)
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uint8_t col = 0;
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uint8_t delay = 0;
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uint8_t on = 0; // on-round or off-round
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uint8_t animation[7];
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volatile uint8_t animation_locked = 0;
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#define TIMESON         7 // time slices to stay on
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#define TIMESOFF        3 // time slices to stay off
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void led_out_init() {
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    DDRA |= 0xFF; // Z0-Z7 output
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    DDRC |= ((1 << PC2) | (1 << PC3) | (1 << PC4) | (1 << PC5) | (1 << PC6) | (1 << PC7)); // S0-S5 output
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}
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void inline led_timer_callback() {
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    if (!animation_locked) {
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        // the Epilepsy was not build for powering the LEDs constantly, so we force a dim
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        delay--;
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        // only after
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        if (!delay) {
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            if (on) {
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                // time is up, go dark
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                ROWPORT = 0;
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                COLPORT &= ~(COLBASE << col);
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                // controll next col in next round
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                col = (col + 1) % 6;
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                delay = TIMESOFF;
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            } else {
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                COLPORT |= (COLBASE << col);
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                // hardware EPI10AQ41 has the rows reversed
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                // to convert old animations use
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                // http://www.mylifesucks.de/tools/epireverse/
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#if HWVERSION == EPI10AQ41
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                uint8_t reverse = 0;
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                for (uint8_t mask = 128; mask; mask >>= 1) {
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                    reverse >>= 1;
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                    if (animation[col] & mask) {
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                        reverse |= 128;
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                    }
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                }
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                ROWPORT = reverse;
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#else
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                ROWPORT = animation[col];
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#endif
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                delay = TIMESON;
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            }
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            on = !on;
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        }
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    }
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}
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