Code:
//video gen and sound
//D.5 is sync:1000 ohm + diode to 75 ohm resistor
//D.6 is video:330 ohm + diode to 75 ohm resistor
//C.0 is sound
#pragma regalloc- //I allocate the registers myself
#pragma optsize- //optimize for speed
#include <Mega32.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <delay.h>
//cycles = 63.625 * 16 Note NTSC is 63.55
//but this line duration makes each frame exactly 1/60 sec
//which is nice for keeping a realtime clock
#define lineTime 1018
#define begin {
#define end }
#define ScreenTop 30
#define ScreenBot 230
#define T0reload 256-60
//NOTE that v1 to v8 and i must be in registers!
register char v1 @4;
register char v2 @5;
register char v3 @6;
register char v4 @7;
register char v5 @8;
register char v6 @9;
register char v7 @10;
register char v8 @11;
register int i @12;
#pragma regalloc+
char syncON, syncOFF;
int LineCount;
int time;
//animation
char x, y, s, vx, vy;
char screen[1600], t, ts[10];
char cu1[]="CORNELL";
char cu2[]="ECE476";
//Point plot lookup table
flash char pos[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
//define some character bitmaps
//5x7 characters
flash char bitmap[38][7]={
//0
0b01110000,
0b10001000,
0b10011000,
0b10101000,
0b11001000,
0b10001000,
0b01110000,
//1
0b00100000,
0b01100000,
0b00100000,
0b00100000,
0b00100000,
0b00100000,
0b01110000,
//2
0b01110000,
0b10001000,
0b00001000,
0b00010000,
0b00100000,
0b01000000,
0b11111000,
//3
0b11111000,
0b00010000,
0b00100000,
0b00010000,
0b00001000,
0b10001000,
0b01110000,
//4
0b00010000,
0b00110000,
0b01010000,
0b10010000,
0b11111000,
0b00010000,
0b00010000,
//5
0b11111000,
0b10000000,
0b11110000,
0b00001000,
0b00001000,
0b10001000,
0b01110000,
//6
0b01000000,
0b10000000,
0b10000000,
0b11110000,
0b10001000,
0b10001000,
0b01110000,
//7
0b11111000,
0b00001000,
0b00010000,
0b00100000,
0b01000000,
0b10000000,
0b10000000,
//8
0b01110000,
0b10001000,
0b10001000,
0b01110000,
0b10001000,
0b10001000,
0b01110000,
//9
0b01110000,
0b10001000,
0b10001000,
0b01111000,
0b00001000,
0b00001000,
0b00010000,
//A
0b01110000,
0b10001000,
0b10001000,
0b10001000,
0b11111000,
0b10001000,
0b10001000,
//B
0b11110000,
0b10001000,
0b10001000,
0b11110000,
0b10001000,
0b10001000,
0b11110000,
//C
0b01110000,
0b10001000,
0b10000000,
0b10000000,
0b10000000,
0b10001000,
0b01110000,
//D
0b11110000,
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b11110000,
//E
0b11111000,
0b10000000,
0b10000000,
0b11111000,
0b10000000,
0b10000000,
0b11111000,
//F
0b11111000,
0b10000000,
0b10000000,
0b11111000,
0b10000000,
0b10000000,
0b10000000,
//G
0b01110000,
0b10001000,
0b10000000,
0b10011000,
0b10001000,
0b10001000,
0b01110000,
//H
0b10001000,
0b10001000,
0b10001000,
0b11111000,
0b10001000,
0b10001000,
0b10001000,
//I
0b01110000,
0b00100000,
0b00100000,
0b00100000,
0b00100000,
0b00100000,
0b01110000,
//J
0b00111000,
0b00010000,
0b00010000,
0b00010000,
0b00010000,
0b10010000,
0b01100000,
//K
0b10001000,
0b10010000,
0b10100000,
0b11000000,
0b10100000,
0b10010000,
0b10001000,
//L
0b10000000,
0b10000000,
0b10000000,
0b10000000,
0b10000000,
0b10000000,
0b11111000,
//M
0b10001000,
0b11011000,
0b10101000,
0b10101000,
0b10001000,
0b10001000,
0b10001000,
//N
0b10001000,
0b10001000,
0b11001000,
0b10101000,
0b10011000,
0b10001000,
0b10001000,
//O
0b01110000,
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b01110000,
//P
0b11110000,
0b10001000,
0b10001000,
0b11110000,
0b10000000,
0b10000000,
0b10000000,
//Q
0b01110000,
0b10001000,
0b10001000,
0b10001000,
0b10101000,
0b10010000,
0b01101000,
//R
0b11110000,
0b10001000,
0b10001000,
0b11110000,
0b10100000,
0b10010000,
0b10001000,
//S
0b01111000,
0b10000000,
0b10000000,
0b01110000,
0b00001000,
0b00001000,
0b11110000,
//T
0b11111000,
0b00100000,
0b00100000,
0b00100000,
0b00100000,
0b00100000,
0b00100000,
//U
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b01110000,
//V
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b01010000,
0b00100000,
//W
0b10001000,
0b10001000,
0b10001000,
0b10101000,
0b10101000,
0b10101000,
0b01010000,
//X
0b10001000,
0b10001000,
0b01010000,
0b00100000,
0b01010000,
0b10001000,
0b10001000,
//Y
0b10001000,
0b10001000,
0b10001000,
0b01010000,
0b00100000,
0b00100000,
0b00100000,
//Z
0b11111000,
0b00001000,
0b00010000,
0b00100000,
0b01000000,
0b10000000,
0b11111000,
//figure1
0b01110000,
0b00100000,
0b01110000,
0b10101000,
0b00100000,
0b01010000,
0b10001000,
//figure2
0b01110000,
0b10101000,
0b01110000,
0b00100000,
0b00100000,
0b01010000,
0b10001000};
//================================
//3x5 font numbers, then letters
//packed two per definition for fast
//copy to the screen at x-position divisible by 4
flash char smallbitmap[39][5]={
//0
0b11101110,
0b10101010,
0b10101010,
0b10101010,
0b11101110,
//1
0b01000100,
0b11001100,
0b01000100,
0b01000100,
0b11101110,
//2
0b11101110,
0b00100010,
0b11101110,
0b10001000,
0b11101110,
//3
0b11101110,
0b00100010,
0b11101110,
0b00100010,
0b11101110,
//4
0b10101010,
0b10101010,
0b11101110,
0b00100010,
0b00100010,
//5
0b11101110,
0b10001000,
0b11101110,
0b00100010,
0b11101110,
//6
0b11001100,
0b10001000,
0b11101110,
0b10101010,
0b11101110,
//7
0b11101110,
0b00100010,
0b01000100,
0b10001000,
0b10001000,
//8
0b11101110,
0b10101010,
0b11101110,
0b10101010,
0b11101110,
//9
0b11101110,
0b10101010,
0b11101110,
0b00100010,
0b01100110,
//:
0b00000000,
0b01000100,
0b00000000,
0b01000100,
0b00000000,
//=
0b00000000,
0b11101110,
0b00000000,
0b11101110,
0b00000000,
//blank
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
//A
0b11101110,
0b10101010,
0b11101110,
0b10101010,
0b10101010,
//B
0b11001100,
0b10101010,
0b11101110,
0b10101010,
0b11001100,
//C
0b11101110,
0b10001000,
0b10001000,
0b10001000,
0b11101110,
//D
0b11001100,
0b10101010,
0b10101010,
0b10101010,
0b11001100,
//E
0b11101110,
0b10001000,
0b11101110,
0b10001000,
0b11101110,
//F
0b11101110,
0b10001000,
0b11101110,
0b10001000,
0b10001000,
//G
0b11101110,
0b10001000,
0b10001000,
0b10101010,
0b11101110,
//H
0b10101010,
0b10101010,
0b11101110,
0b10101010,
0b10101010,
//I
0b11101110,
0b01000100,
0b01000100,
0b01000100,
0b11101110,
//J
0b00100010,
0b00100010,
0b00100010,
0b10101010,
0b11101110,
//K
0b10001000,
0b10101010,
0b11001100,
0b11001100,
0b10101010,
//L
0b10001000,
0b10001000,
0b10001000,
0b10001000,
0b11101110,
//M
0b10101010,
0b11101110,
0b11101110,
0b10101010,
0b10101010,
//N
0b00000000,
0b11001100,
0b10101010,
0b10101010,
0b10101010,
//O
0b01000100,
0b10101010,
0b10101010,
0b10101010,
0b01000100,
//P
0b11101110,
0b10101010,
0b11101110,
0b10001000,
0b10001000,
//Q
0b01000100,
0b10101010,
0b10101010,
0b11101110,
0b01100110,
//R
0b11101110,
0b10101010,
0b11001100,
0b11101110,
0b10101010,
//S
0b11101110,
0b10001000,
0b11101110,
0b00100010,
0b11101110,
//T
0b11101110,
0b01000100,
0b01000100,
0b01000100,
0b01000100,
//U
0b10101010,
0b10101010,
0b10101010,
0b10101010,
0b11101110,
//V
0b10101010,
0b10101010,
0b10101010,
0b10101010,
0b01000100,
//W
0b10101010,
0b10101010,
0b11101110,
0b11101110,
0b10101010,
//X
0b00000000,
0b10101010,
0b01000100,
0b01000100,
0b10101010,
//Y
0b10101010,
0b10101010,
0b01000100,
0b01000100,
0b01000100,
//Z
0b11101110,
0b00100010,
0b01000100,
0b10001000,
0b11101110
};
//==================================
//This is the sync generator and raster generator. It MUST be entered from
//sleep mode to get accurate timing of the sync pulses
interrupt [TIM1_COMPA] void t1_cmpA(void)
begin
//start the Horizontal sync pulse
PORTD = syncON;
//count timer 0 at 1/usec
TCNT0=0;
//update the curent scanline number
LineCount ++ ;
//begin inverted (Vertical) synch after line 247
if (LineCount==248)
begin
syncON = 0b00100000;
syncOFF = 0;
end
//back to regular sync after line 250
if (LineCount==251)
begin
syncON = 0;
syncOFF = 0b00100000;
end
//start new frame after line 262
if (LineCount==263)
begin
LineCount = 1;
end
delay_us(2); //adjust to make 5 us pulses
//end sync pulse
PORTD = syncOFF;
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