Here is the tvout.h library code:
/*
Copyright (c) 2010 Myles MetzerPermission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
/
/
This library provides a simple method for outputting data to a tv
from a frame buffer stored in sram. This implementation is done
completly by interupt and will return give as much cpu time to the
application as possible.
*/
#ifndef TVOUT_H
#define TVOUT_H#include <stdint.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <stdlib.h>#include "video_gen.h"
#include "spec/hardware_setup.h"
#include "spec/video_properties.h"// macros for readability when selecting mode.
#define PAL 1
#define NTSC 0
#define _PAL 1
#define _NTSC 0#define WHITE 1
#define BLACK 0
#define INVERT 2#define UP 0
#define DOWN 1
#define LEFT 2
#define RIGHT 3#define DEC 10
#define HEX 16
#define OCT 8
#define BIN 2
#define BYTE 0// Macros for clearer usage
#define clear_screen() fill(0)
#define invert(color) fill(2)