MPM controlled 16ch RGB LED dimmer
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/***************************************************************************
* helper functions for demo modes *
* *
* Copyright (C) 2011 - 2012 by Olaf Rempel *
* razzor AT kopf MINUS tisch DOT de *
* *
* 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; 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 <stdint.h>
#include <string.h>
#include "rgb16mpm.h"
uint8_t sequence_chase(uint8_t old_value, uint8_t *dir, uint16_t mask)
{
uint8_t value = old_value;
do {
value = (*dir) ? value +1 : value -1;
value &= 0x0F;
if (value == 0x00 || value == 0x0F) {
*dir = (value == 0x00);
}
} while (!((1<<value) & mask) || value == old_value);
return value;
}
uint16_t color_ramp(uint16_t value, uint8_t *color)
{
uint8_t col1 = (value & 0xFF);
uint8_t col2 = 0xFF - col1;
switch (value >> 8) {
default:
value = 0x0000;
/* no break */
case 0: /* red: on, green: ramp up, blue: off */
color[0] = 0xFF;
color[1] = col1;
color[2] = 0x00;
break;
case 1: /* red: ramp down, green: on, blue:off */
color[0] = col2;
color[1] = 0xFF;
color[2] = 0x00;
break;
case 2: /* red: off, green: on, blue: ramp up */
color[0] = 0x00;
color[1] = 0xFF;
color[2] = col1;
break;
case 3: /* red: off, green: ramp down: blue: on */
color[0] = 0x00;
color[1] = col2;
color[2] = 0xFF;
break;
case 4: /* red: ramp up, green: off, blue: on */
color[0] = col1;
color[1] = 0x00;
color[2] = 0xFF;
break;
case 5: /* red: on, green: off, blue: ramp down */
color[0] = 0xFF;
color[1] = 0x00;
color[2] = col2;
break;
}
return value;
}
void color_add(uint8_t *color1, uint8_t *color2, uint8_t *output)
{
uint8_t i;
for (i = 0; i < 3; i++) {
uint16_t tmp = color1[i] + color2[i];
output[i] = (tmp & 0xFF00) ? 0xFF : tmp;
}
}
void color_sub(uint8_t *color1, uint8_t *color2, uint8_t *output)
{
uint8_t i;
for (i = 0; i < 3; i++) {
uint16_t tmp = color1[i] - color2[i];
output[i] = (tmp & 0xFF00) ? 0x00 : tmp;
}
}
void color_div(uint8_t *color, uint8_t div, uint8_t *output)
{
uint8_t i;
for (i = 0; i < 3; i++) {
if (color[i] != 0) {
output[i] = color[i] / div;
if (output[i] == 0) {
output[i] = 0x01;
}
} else {
output[i] = 0x00;
}
}
}