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Counter with lcd

 
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Kumara



Joined: 16 Oct 2013
Posts: 7
Location: Sri Lanka

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Counter with lcd
PostPosted: Thu Oct 17, 2013 10:49 am     Reply with quote

This will help for beginners. Lcd.c driver is available in Picc\Drivers (CCS C Compiler).
Code:

// Program function: Digital counter with LCD.                 
// Target processor 16F877A (20 MHZ)
// Written by Kumara                           

#include <16F877A.h>              // Pic Microcontroller (MCU)
#DEVICE ADC=10                    // 8 Bit analog resolution
#fuses NOWDT,HS, NOPUT, NOPROTECT // Fuses
#fuses NOBROWNOUT, NOLVP          // Fuses
#use delay(clock=20000000)        // Crystal Oscillator Frequency ( 20 MHZ)

#include <lcd.c>                  // Driver for LCD Module ( PICC\DRIVERS )



   void main()                    // Main block
   {


   INT16 PRE_COUNT=0;             // Declare variable
   INT16 SET_COUNT;               // Declare variable
   INT1 SW1;                      // Declare variable
   BOOLEAN ISPRESSED=FALSE;       // Boolean logic=0;



   setup_adc_ports(AN0);
   setup_adc(ADC_CLOCK_INTERNAL);
 


   lcd_init();
   
   while (TRUE) {                // Endless loop

   SW1=INPUT(PIN_C0);            // Positive inputs

         IF(PRE_COUNT==0)
         {
         lcd_putc("\f");         // LCD clear
         lcd_gotoxy(1,1);        // Select Raw 1 & start digit 1 position
         printf(lcd_putc," PRE_COUNT:%04LU ",PRE_COUNT);

         lcd_gotoxy(1,2);        // Select Raw 2 & start digit 1 position
         printf(lcd_putc," SET_COUNT:%04LU ",SET_COUNT);
         DELAY_MS(200);
         }

         ////////////////////////////////////////////////////////

         SET_ADC_CHANNEL(0);     // INPUT AN0
         DELAY_US(100);
         SET_COUNT=READ_ADC();   // SET VALUE= RA1 ( 10K V/R )
         SET_COUNT=(SET_COUNT);  // FOR 4 DIGITS UP TO 1023
         ////////////////////////////////////////////////////////

         IF (SW1 && !ISPRESSED) 
         {

         DELAY_MS(10);           

         SW1=INPUT(PIN_A1);     
         IF(SW1)                 
         {PRE_COUNT++;           

         ISPRESSED=TRUE;         

         lcd_putc("\f");         // LCD clear

         lcd_gotoxy(1,1);        // Select Raw 1 & start digit 1 position
         printf(lcd_putc," PRE_COUNT:%04LU ",PRE_COUNT);

         lcd_gotoxy(1,2);        // Select Raw 2 & start digit 1 position
         printf(lcd_putc," SET_COUNT:%04LU ",SET_COUNT);
         DELAY_MS(100);


         IF(PRE_COUNT>=SET_COUNT)
            {
            OUTPUT_HIGH(PIN_B0);

            }
         ELSE
            {
            OUTPUT_LOW(PIN_B0);

            }
       }
   }

         IF(!SW1)                 // This line must be here
         {
         ISPRESSED=FALSE;         // This line must be here

         }
     }
 }

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