app.c

AVR Devolpment Board

#include "avr/io.h"
#include "util/delay.h"
#include "avr/pgmspace.h"
#include "avr/interrupt.h"

const prog_char SegCode[16]={
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; 

volatile unsigned char DisBuffer[8];


void TimerConfig(void)
{
	TCCR0=(1<<CS01)|(1<<CS00);     //控制寄存器，工作方式及时钟选择
	TCNT0=(256-250);//计数值	
	TIMSK=0x01;     //中断控制
	sei();
}

SIGNAL(TIMER0_OVF_vect)
{
	static unsigned char i=0;
	TCNT0=(256-250);
	
	PORTB = pgm_read_byte(&SegCode[DisBuffer[i]]);
	PORTA|= (1<<PA4);
	PORTA&=~(1<<PA4);	
				
	PORTB = (1<<i);
	PORTA|= (1<<PA5);
	PORTA&=~(1<<PA5);

	i++;
	if(i==8)
		i=0;
	
}	

void delay_ms(unsigned int ms)
{
	while(ms--)
		_delay_ms(1);
}


int main(void)
{
	unsigned int Count=0;

	/* Set LED and Smg LE pin as output , databus as output */
	DDRA |=(1<<PA4)|(1<<PA5)|(1<<PA6); 
	DDRB  = 0xFF;

	/* Off the LED display */
	PORTB = 0xFF;
	PORTA|= (1<<PA6);
	PORTA&=~(1<<PA6);

	TimerConfig();
	while(1)
	{
		Count++;

		DisBuffer[0]=0;
		DisBuffer[1]=0;
		DisBuffer[2]=0;
		DisBuffer[3]=Count/10000%10;
		DisBuffer[4]=Count/1000%10;
		DisBuffer[5]=Count/100%10;
		DisBuffer[6]=Count/10%10;
		DisBuffer[7]=Count/1%10;
	}
	return 0;
}