app.c

AVR Devolpment Board

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


/* Segment code table for Common Cathode 7-segment displays */
const prog_char SegCode[16]={
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; 

unsigned char DisBuffer[8];


void SmgScan(void)
{
	unsigned char i=0;
	for(i=0;i<8;i++)
	{
		PORTB = pgm_read_byte(&SegCode[DisBuffer[i]]);/* Output the Segment code */
		PORTA|= (1<<PA4);
		PORTA&=~(1<<PA4);
				
		PORTB = (1<<i);  /* Select one 7-segment display */ 
		PORTA|= (1<<PA5);
		PORTA&=~(1<<PA5);

		_delay_ms(2);
	}
}

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

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

	/* Turn off the LEDs */
	PORTB = 0xFF;
	PORTA|= (1<<PA6);
	PORTA&=~(1<<PA6);

	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;
		DisBuffer[3]=0;
		DisBuffer[4]=0;
		DisBuffer[5]=0;
		DisBuffer[6]=4;
		DisBuffer[7]=5;
		
		SmgScan();
	}
	return 0;
}