display.h

/*
 * Display processing for the TAP (Technology Access Platform)
 *
 * Copyright (C) 2016 TheLab.ms
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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.
 */

#ifndef __DISPLAY_H
#define __DISPLAY_H

#include <stdbool.h>

#ifdef __cplusplus
extern "C"
{
#endif

/*
 * Set maximum LED ON time,
 * Set too large - get flicker,
 * Set too low - get more overhead and lose dynamic range of intensity
 */
#define MAX_DELAY   31
#define NUM_LEVELS  MAX_DELAY+1

#define	LOW_POWER_DELAY 3	/* Cycles for individual LED ON delay */
#define	BRIGHT_DELAY    4	/* Adjust when MAX_DELAY is changed */

#define	FULL_INTENSITY          MAX_DELAY
#define	HALF_INTENSITY          (FULL_INTENSITY / 2)
#define	QUARTER_INTENSITY       (HALF_INTENSITY / 2)
#define	EIGHTH_INTENSITY        (QUARTER_INTENSITY / 2)

//*********** The display buffer ************************
#define NUM_COLORS      3
#define	RED             0
#define	GREEN           1
#define	BLUE            2

#define NUM_COLS        8
#define NUM_ROWS        8

extern unsigned char display_buffer[NUM_ROWS][NUM_COLS][NUM_COLORS];

void scan_LEDs();
void display_init();

#ifdef __cplusplus
}
#endif

#endif /* __DISPLAY_H */