videoopt32.c

单片机VIDEO源代码及说明.其实我也不知道里面是做什么用的.我只是拿来学C编程的.

 
//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;   
  
  if (LineCount<ScreenBot && LineCount>=ScreenTop) 
    begin 
       
       //compute byte index for beginning of the next line
       //left-shift 4 would be individual lines
       // <<3 means line-double the pixels 
       //The 0xfff8 truncates the odd line bit
       //i=(LineCount-ScreenTop)<<3 & 0xfff8; //
       
       #asm
       push r16
       lds   r12, _LineCount
       lds   r13, _Linecount+1
       ldi   r16, 30
       sub  r12, r16 
       ldi  r16,0
       sbc  r13, r16 
       lsl  r12
       rol  r13
       lsl  r12
       rol  r13
       lsl  r12    
       rol  r13
       mov  r16,r12
       andi r16,0xf0
       mov  r12,r16
       pop r16 
       #endasm
        
       //load 16 registers with screen info
       #asm
       ;push r12
       ;push r13
       push r14
       push r15
       push r16
       push r17
       push r18 
       push r19 
       push r26
       push r27
       
       ldi  r26,low(_screen)   ;base address of screen
       ldi  r27,high(_screen)   
       add  r26,r12            ;offset into screen (add i)
       adc  r27,r13
       ld   r4,x+   	       ;load 16 registers and inc pointer
       ld   r5,x+