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Single Digit 7 Segment Display with Increment/Decrement

 
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MassaM



Joined: 08 Jun 2019
Posts: 31

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Single Digit 7 Segment Display with Increment/Decrement
PostPosted: Thu Jul 18, 2019 5:27 am     Reply with quote

Code:

/*
   
   Tutorial:   Single Digit 7 Segment - Increment and Decrement with buttons and display/output
   Compiler:   CCS-C-PIC - PCWHD Version 5.076
   Author:     MassaM SDC (Solutions Development Consultancy), June 2019
   Contact:    Reach me on,
               Facebook:    https://www.facebook.com/massam.sdc
               Youtube:     https://www.youtube.com/channel/UCbgiHBouih1yzir6Y1zX2VA
   Chip:       PIC16F877A@4Mhz
               
*/

#include <16f877A.h> // include the MCUs main header/definitions file

#fuses XT,NOWDT,NOPROTECT,NOBROWNOUT,NOLVP,NOPUT,NOWRT,NODEBUG,NOCPD // MCU setup the fuses

#use delay(clock=4Mhz)  // set the oscillator/clock to 4 Mhz

#byte TRISB = 0x86 //identify TRISB
#byte TRISC = 0x87 //identify TRISC

#byte PORTB = 0x06 //identify PORTB
#byte PORTC = 0x07 //identify PORTC

#bit TRISB0 = TRISB.0   // bit0 of TRISB
#bit TRISB1 = TRISB.1   // bit1 of TRISB

#bit SW_INC = PORTB.0   // bit0 of PORTB
#bit SW_DEC = PORTB.1   // bit1 of PORTB

void main() // main application start
{
             //                  numbers in hex 
             // 0  ,  1  ,  2  ,  3  ,  4  ,  5  ,  6  ,  7 ,  8  ,  9
  int digit[]={0x3F, 0x06, 0x5b, 0x4F, 0x66, 0x6D, 0xFD, 0x7, 0xFF, 0x6F};
 
  signed int count = 0; // initial count is 0
 
  int switch_state = 1; // initial switch state is high

  TRISB0 = 1;  // Port B bit 0 is input
  TRISB1 = 1;  // Port B bit 1 is input

  TRISC = 0;  // Port C all are outputs for 7 Segments

  SW_INC = 1;// initial port B bit 0 is high
  SW_DEC = 1;// initial port B bit 1 is high

  PORTC = digit[count]; // initial Port C is set to display digit 0
   
   while(TRUE) // inifite/forever loop   
   {


     if( SW_INC == 1 && SW_DEC == 1)  // if both buttons are at high state
         
         switch_state = 1; // set the switch state flag to 1 as high
         
         if(switch_state == 1) // check if switch state flag is still at 1 as high
         {
     
            if(SW_INC == 0)   // if Increment switch was pressed and in low state
            {
               switch_state = 0; // set the switch state flag to 0 as low
                             
               count++; // add 1 to count

               if(count > 9)  // if count reached nine,
                  count = 0;  // then reset to zero
               
               PORTC = digit[count]; // display/output the count as 7 segment digit
               delay_ms(10);  // delay for 7segment refresh time
            }
         
           if(SW_DEC == 0) // if Decrement switch was pressed and in low state
           {
               switch_state = 0; // set the switch state flag to 0 as low
           
               count--; // minus 1 from count

               if(count < 0)  // if count reached zero,
                  count = 9;  // then reset to nine

               PORTC = digit[count];   // display/output the count as 7 segment digit
               delay_ms(10);  // delay for 7segment refresh time
            }
           
         } // switc_state == 1
         
   
   
   } // while
} // main


Next edition will be with a 74HC164 to use only 2 pins of MCU. Stay tuned!

Hope this helps! Smile
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{
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