I had a thread in the old forums and as this section is for video output I though I would start a new thread here.
Anyway, TVout is an interrupt driven composite video output Library using only 2 resistors to generate a black and white signal at configurable resolutions (defaults to 128x96). It can output text with several included fonts, draw simple shapes, bitmaps, generate 1bit audio, and allows direct access to the frame buffer for custom display routines.
This Library does restrict the use of interrupts (like the ones used by the Serial library) to combat this it includes 2 hooks for calling functions at fixed intervals. One occurs every scan-line and is suitable for very fast methods such as polling the serial connection; this is demon-straighted in the add-on library pollserial. The second occurs once per frame for longer methods like polling a game-pad or plying music in the background.
Full documentation on this library can be found here: Google Code Archive - Long-term storage for Google Code Project Hosting.
Output Schematic:
Specific Connections per device can be found on the Google code page.
Example Video and Source Code (excluding image data):
#include <TVout.h>
#include <fontALL.h>
#include "schematic.h"
#include "TVOlogo.h"
TVout TV;
int zOff = 150;
int xOff = 0;
int yOff = 0;
int cSize = 50;
int view_plane = 64;
float angle = PI/60;
float cube3d[8][3] = {
{xOff - cSize,yOff + cSize,zOff - cSize},
{xOff + cSize,yOff + cSize,zOff - cSize},
{xOff - cSize,yOff - cSize,zOff - cSize},
{xOff + cSize,yOff - cSize,zOff - cSize},
{xOff - cSize,yOff + cSize,zOff + cSize},
{xOff + cSize,yOff + cSize,zOff + cSize},
{xOff - cSize,yOff - cSize,zOff + cSize},
{xOff + cSize,yOff - cSize,zOff + cSize}
};
unsigned char cube2d[8][2];
void setup() {
TV.begin(NTSC,120,96);
TV.select_font(font6x8);
intro();
TV.println("I am the TVout\nlibrary running on a freeduino\n");
TV.delay(2500);
TV.println("I generate a PAL\nor NTSC composite video using\ninterrupts\n");
TV.delay(2500);
TV.println("My schematic:");
TV.delay(1500);
TV.bitmap(0,0,schematic);
TV.delay(10000);
TV.clear_screen();
TV.println("Lets see what\nwhat I can do");
TV.delay(2000);
//fonts
TV.clear_screen();
TV.println(0,0,"Multiple fonts:");
TV.select_font(font4x6);
TV.println("4x6 font FONT");
TV.select_font(font6x8);
TV.println("6x8 font FONT");
TV.select_font(font8x8);
TV.println("8x8 font FONT");
TV.select_font(font6x8);
TV.delay(2000);
TV.clear_screen();
TV.print(9,44,"Draw Basic Shapes");
TV.delay(2000);
//circles
TV.clear_screen();
TV.draw_circle(TV.hres()/2,TV.vres()/2,TV.vres()/3,WHITE);
TV.delay(500);
TV.draw_circle(TV.hres()/2,TV.vres()/2,TV.vres()/2,WHITE,INVERT);
TV.delay(2000);
//rectangles and lines
TV.clear_screen();
TV.draw_rect(20,20,80,56,WHITE);
TV.delay(500);
TV.draw_rect(10,10,100,76,WHITE,INVERT);
TV.delay(500);
TV.draw_line(60,20,60,76,INVERT);
TV.draw_line(20,48,100,48,INVERT);
TV.delay(500);
TV.draw_line(10,10,110,86,INVERT);
TV.draw_line(10,86,110,10,INVERT);
TV.delay(2000);
//random cube forever.
TV.clear_screen();
TV.print(16,40,"Random Cube");
TV.print(28,48,"Rotation");
TV.delay(2000);
randomSeed(analogRead(0));
}
void loop() {
int rsteps = random(10,60);
switch(random(6)) {
case 0:
for (int i = 0; i < rsteps; i++) {
zrotate(angle);
printcube();
}
break;
case 1:
for (int i = 0; i < rsteps; i++) {
zrotate(2*PI - angle);
printcube();
}
break;
case 2:
for (int i = 0; i < rsteps; i++) {
xrotate(angle);
printcube();
}
break;
case 3:
for (int i = 0; i < rsteps; i++) {
xrotate(2*PI - angle);
printcube();
}
break;
case 4:
for (int i = 0; i < rsteps; i++) {
yrotate(angle);
printcube();
}
break;
case 5:
for (int i = 0; i < rsteps; i++) {
yrotate(2*PI - angle);
printcube();
}
break;
}
}
void intro() {
unsigned char w,l,wb;
int index;
w = pgm_read_byte(TVOlogo);
l = pgm_read_byte(TVOlogo+1);
if (w&7)
wb = w/8 + 1;
else
wb = w/8;
index = wb*(l-1) + 2;
for ( unsigned char i = 1; i < l; i++ ) {
TV.bitmap((TV.hres() - w)/2,0,TVOlogo,index,w,i);
index-= wb;
TV.delay(50);
}
for (unsigned char i = 0; i < (TV.vres() - l)/2; i++) {
TV.bitmap((TV.hres() - w)/2,i,TVOlogo);
TV.delay(50);
}
TV.delay(3000);
TV.clear_screen();
}
void printcube() {
//calculate 2d points
for(byte i = 0; i < 8; i++) {
cube2d[i][0] = (unsigned char)((cube3d[i][0] * view_plane / cube3d[i][2]) + (TV.hres()/2));
cube2d[i][1] = (unsigned char)((cube3d[i][1] * view_plane / cube3d[i][2]) + (TV.vres()/2));
}
TV.delay_frame(1);
TV.clear_screen();
draw_cube();
}
void zrotate(float q) {
float tx,ty,temp;
for(byte i = 0; i < 8; i++) {
tx = cube3d[i][0] - xOff;
ty = cube3d[i][1] - yOff;
temp = tx * cos(q) - ty * sin(q);
ty = tx * sin(q) + ty * cos(q);
tx = temp;
cube3d[i][0] = tx + xOff;
cube3d[i][1] = ty + yOff;
}
}
void yrotate(float q) {
float tx,tz,temp;
for(byte i = 0; i < 8; i++) {
tx = cube3d[i][0] - xOff;
tz = cube3d[i][2] - zOff;
temp = tz * cos(q) - tx * sin(q);
tx = tz * sin(q) + tx * cos(q);
tz = temp;
cube3d[i][0] = tx + xOff;
cube3d[i][2] = tz + zOff;
}
}
void xrotate(float q) {
float ty,tz,temp;
for(byte i = 0; i < 8; i++) {
ty = cube3d[i][1] - yOff;
tz = cube3d[i][2] - zOff;
temp = ty * cos(q) - tz * sin(q);
tz = ty * sin(q) + tz * cos(q);
ty = temp;
cube3d[i][1] = ty + yOff;
cube3d[i][2] = tz + zOff;
}
}
void draw_cube() {
TV.draw_line(cube2d[0][0],cube2d[0][1],cube2d[1][0],cube2d[1][1],WHITE);
TV.draw_line(cube2d[0][0],cube2d[0][1],cube2d[2][0],cube2d[2][1],WHITE);
TV.draw_line(cube2d[0][0],cube2d[0][1],cube2d[4][0],cube2d[4][1],WHITE);
TV.draw_line(cube2d[1][0],cube2d[1][1],cube2d[5][0],cube2d[5][1],WHITE);
TV.draw_line(cube2d[1][0],cube2d[1][1],cube2d[3][0],cube2d[3][1],WHITE);
TV.draw_line(cube2d[2][0],cube2d[2][1],cube2d[6][0],cube2d[6][1],WHITE);
TV.draw_line(cube2d[2][0],cube2d[2][1],cube2d[3][0],cube2d[3][1],WHITE);
TV.draw_line(cube2d[4][0],cube2d[4][1],cube2d[6][0],cube2d[6][1],WHITE);
TV.draw_line(cube2d[4][0],cube2d[4][1],cube2d[5][0],cube2d[5][1],WHITE);
TV.draw_line(cube2d[7][0],cube2d[7][1],cube2d[6][0],cube2d[6][1],WHITE);
TV.draw_line(cube2d[7][0],cube2d[7][1],cube2d[3][0],cube2d[3][1],WHITE);
TV.draw_line(cube2d[7][0],cube2d[7][1],cube2d[5][0],cube2d[5][1],WHITE);
}
Tetris Using either a Hackvision or a Video Game Shield with a wii classic controller(can wire it up without the shield too) for input: