lesson5.c

AVR mega16单片机的示例程序

#include <avr/io.h>

char scandata[16] = 
{
  0b10101111,//0
  0b10100000,//1
  0b11000111,//2
  0b11100110,//3
  0b11101000,//4
  0b01101110,//5
  0b01101111,//6
  0b10100010,//7
  0b11101111,//8
  0b11101110,//9
  0b11101011,//A
  0b01101101,//b
  0b00001111,//C
  0b11100101,//d
  0b01001111,//E
  0b01001011,//F
};

int main(void)
{
	int j;
	
	DDRD &= ~(1 << 6);
	PORTD |= (1 << 6);
	DDRD &= ~(1 << 7);
	PORTD |= (1 << 7);
	DDRD &= ~(1 << 2);
	PORTD |= (1 << 2);
	DDRD &= ~(1 << 3);
	PORTD |= (1 << 3);

	DDRA |= (1 << 3);
	PORTA &= ~(1 << 3);//关蜂鸣器

	DDRB = 0xff;

	DDRA |= 0xf0;

	while(1)
	{
		PORTB = scandata[0];
		PORTA |= (1 << 4);
		for(j = 0;j < 400;j ++);
		PORTA &= 0x0f;
		PORTB = scandata[1];
		PORTA |= (1 << 5);
		for(j = 0;j < 400;j ++);
		PORTA &= 0x0f;
		PORTB = scandata[2];
		PORTA |= (1 << 6);
		for(j = 0;j < 400;j ++);
		PORTA &= 0x0f;
		PORTB = scandata[3];
		PORTA |= (1 << 7);
		for(j = 0;j < 400;j ++);
		PORTA &= 0x0f;
	}
}