Embedded C code for Two 7 Segment displays

Sample code for Two 7 Segment displays using delay subroutine.
Following code can be using for AVR series ICs like: ATmega8, ATmega16, ATmega32.

 

#include <avr/io.h>
#include <util/delay.h>

#define	DISPLAY_PORT	PORTD
#define	DISPLAY_DDR		DDRD

#define	DISPLAY_CTRL_PORT	PORTB
#define	DISPLAY_CTRL_DDR	DDRB

#define	ZERO       0x77 
#define	ONE        0x41
#define	TWO        0x3B
#define	THREE      0x6B
#define	FOUR       0x4D
#define	FIVE       0x6E
#define	SIX        0x7E
#define	SEVEN      0x43
#define	EIGHT      0x7F
#define	NINE       0x6F
#define	DOT        0x80

#define	DIGIT1				4	//(left most)
#define	DIGIT2				5
#define	DIGIT3				6
#define	DIGIT4				7	//(right most)


#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif

#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif

int main(void)
{
	int i=0;
	int d1,d2,d3;
	int disp1,disp2,disp3;
	
	DISPLAY_DDR=0xFF;
	DISPLAY_PORT=0x00;
	
	DISPLAY_CTRL_DDR=0xff;
	DISPLAY_CTRL_PORT=0x00;	
	
	_delay_ms(4000);
	
	while(1)
	{
	
		for(d1=0;d1<10;d1++)
		{
			for(d2=0;d2<10;d2++)
			{
				for(d3=0;d3<10;d3++)
				{
				
					for(i=0;i<1000;i++)
					{
						

						switch(d1)
						{
						    case 0:
							disp1=~ZERO;
							break;
						    case 1:
							disp1=~ONE;
							break;
						    case 2:
							disp1=~TWO;
							break;
						    case 3:
							disp1=~THREE;
							break;
						    case 4:
							disp1=~FOUR;
							break;
						    case 5:
							disp1=~FIVE;
							break;
						    case 6:
							disp1=~SIX;
							break;
						    case 7:
							disp1=~SEVEN;
							break;
						    case 8:
							disp1=~EIGHT;
							break;
						    case 9:
							disp1=~NINE;
							break;		
						}
						

						switch(d2)
						{
						    case 0:
							disp2=~ZERO;
							break;
						    case 1:
							disp2=~ONE;
							break;
						    case 2:
							disp2=~TWO;
							break;
						    case 3:
							disp2=~THREE;
							break;
						    case 4:
							disp2=~FOUR;
							break;
						    case 5:
							disp2=~FIVE;
							break;
						    case 6:
							disp2=~SIX;
							break;
						    case 7:
							disp2=~SEVEN;
							break;
						    case 8:
							disp2=~EIGHT;
							break;
						    case 9:
							disp2=~NINE;
							break;		
						}
		

						switch(d3)
						{
						    case 0:
							disp3=~ZERO;
							break;
						    case 1:
							disp3=~ONE;
							break;
						    case 2:
							disp3=~TWO;
							break;
						    case 3:
							disp3=~THREE;
							break;
						    case 4:
							disp3=~FOUR;
							break;
						    case 5:
							disp3=~FIVE;
							break;
						    case 6:
							disp3=~SIX;
							break;
						    case 7:
							disp3=~SEVEN;
							break;
						    case 8:
							disp3=~EIGHT;
							break;
						    case 9:
							disp3=~NINE;
							break;		
						}
		
						
					sbi(DISPLAY_CTRL_PORT,DIGIT1);
					cbi(DISPLAY_CTRL_PORT,DIGIT2);
					cbi(DISPLAY_CTRL_PORT,DIGIT3);
					DISPLAY_PORT=disp3;
					_delay_us(200);
			
					cbi(DISPLAY_CTRL_PORT,DIGIT1);
					sbi(DISPLAY_CTRL_PORT,DIGIT2);
					cbi(DISPLAY_CTRL_PORT,DIGIT3);
					DISPLAY_PORT=disp2;
					_delay_us(200);
						
					cbi(DISPLAY_CTRL_PORT,DIGIT1);
					cbi(DISPLAY_CTRL_PORT,DIGIT2);
					sbi(DISPLAY_CTRL_PORT,DIGIT3);
					DISPLAY_PORT=disp1;
					_delay_us(200);
					}
					
				}
			
			}
		
		}
	
	}	
	return 0;
}

 

Highlights

• List of Projects

  Navigate through wide range of projects of 8051. Applications including ADC, DAC, LCD, Matrix LEDs, Keypad, Stepper Motor, DC motor, EEPROM, Relay, Timer, Sensors, RTC and much more.

  
  

  Quick Links for the projects, click on the link to see details.

      Pick and Place Robot     Temperature & Light Controller     Rolling Display Matrix LEDs   Person Counter & Password Detector   Home Security System   Data Logger   Greenhouse monitor & control   Flow computer   Electronic Voting Machine   Pick & Place Robot   Temperature & Light Controller   Rolling Display Matrix LEDs   Person Counter & Password Detector   Data Logger   Home Security System   Greenhouse monitor & control   Flow computer  
  Read More