硬體接法
程式內容
#include <avr/io.h>
//Quickly Turn VSYNC On/Off
//Or You Can Change The VSYNC Pin..
#define VSYNC_LOW PORTD &= ~_BV(6)
#define VSYNC_HIGH PORTD |= _BV(6)
//Quickly Turn HSYNC On/Off
//Or You Can Change The HSYNC Pin..
#define HSYNC_LOW PORTD &= ~_BV(7)
#define HSYNC_HIGH PORTD |= _BV(7)
//RED
#define RED_ON PORTB |= _BV(4)
#define RED_OFF PORTB &= ~_BV(4)
//Green
#define GREEN_ON PORTB |= _BV(3)
#define GREEN_OFF PORTB &= ~_BV(3)
//BLUE
#define BLUE_ON PORTB |= _BV(2)
#define BLUE_OFF PORTB &= ~_BV(2)
void setup() {
}
void loop() {
//Initializations
int i = 0;
cli();
DDRB = 0xFF;
DDRD = 0xFF;
//Loop Over-And-Over Again
while(1){
//Clear The i counter
i=0;
//VSYNC Low
VSYNC_LOW;
//200 Lines Of Red
while(i < 200){
//Red Color High
RED_ON;
//2.2uS Back Porch
delayMicroseconds(2);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
//20uS Color Data
delayMicroseconds(20); // 1uS
//Red Color Low
RED_OFF; //Low
//1uS Front Porch
delayMicroseconds(1); // 1uS
i++;
//3.2uS Horizontal Sync
HSYNC_HIGH; //HSYNC High
delayMicroseconds(3);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
HSYNC_LOW; //HSYNC Low
//26.4uS Total
}
//Clear The i counter
i=0;
//VSYNC Low
VSYNC_LOW;
//200 Lines Of Green
while(i < 200){
//Green Color High
GREEN_ON;
//2.2uS Back Porch
delayMicroseconds(2);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
//20uS Color Data
delayMicroseconds(20); // 1uS
//Green Color Low
GREEN_OFF; //Low
//1uS Front Porch
delayMicroseconds(1); // 1uS
i++;
//3.2uS Horizontal Sync
HSYNC_HIGH; //HSYNC High
delayMicroseconds(3);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
HSYNC_LOW; //HSYNC Low
//26.4uS Total
}
//Clear The i counter
i=0;
//VSYNC Low
VSYNC_LOW; //Low
//200 Lines Of Blue
while(i<200){
//Blue Color High
BLUE_ON; //Low
//2.2uS Back Porch
delayMicroseconds(2);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
//20uS Color Data
delayMicroseconds(20); // 1uS
//Blue Color Low
BLUE_OFF; //Low
//1uS Front Porch
delayMicroseconds(1); // 1uS
i++;
//3.2uS Horizontal Sync
HSYNC_HIGH; //HSYNC High
delayMicroseconds(3);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
HSYNC_LOW; //HSYNC Low
//26.4uS Total
}
//Clear The i counter
i=0;
//VSYNC High
VSYNC_HIGH;
//4 Lines Of VSYNC
while(i<4){
//2.2uS Back Porch
delayMicroseconds(2);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
//20 uS Of Color Data
delayMicroseconds(20);// 20uS
//1uS Front Porch
delayMicroseconds(1); // 1uS
i++;
//HSYNC for 3.2uS
HSYNC_HIGH; //High
delayMicroseconds(3);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
HSYNC_LOW; //Low
//26.4uS Total
}
//Clear The i counter
i=0;
//VSYNC Low
VSYNC_LOW;
//23 Lines Of Vertical Back Porch + 1 Line Of Front Porch
//This is very, very flexible...I'm setting it to 22 Lines!
while(i < 22){
//2.2uS Back Porch
delayMicroseconds(2);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
//20uS Color Data
delayMicroseconds(20);// 20uS
//1uS Front Porch
delayMicroseconds(1); // 1uS
i++;
//HSYNC for 3.2uS
HSYNC_HIGH; //High
delayMicroseconds(3);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
HSYNC_LOW; //Low
//26.4uS Total
}
}
}
