Lab 4 - Binary Polling Scheme Counter

#include <p16f887.inc>
__CONFIG _FOSC_XT & _WDTE_OFF & _PWRTE_OFF & _BOREN_OFF & _LVP_OFF & _CPD_OFF & _WRT_OFF & _CP_OFF

    ORG 0
    GOTO main
    ORG 4
    GOTO isr

main:
   
    BANKSEL TRISD
    MOVLW 0xFF
    MOVWF TRISD ; set PORTD for inputs
    MOVLW 0x00
    MOVWF TRISC ; set PORTC for outputs
    CLRF TRISC
    BANKSEL PORTC
    CLRF PORTC
    CLRW
   
    
loop:
    BANKSEL PORTD
    BTFSC PORTD, 0
    GOTO click
    GOTO loop

click:
;    XORWF PORTD, 0 
;    MOVWF PORTC
    MOVLW 0xFF
    SUBWF PORTC, 0
    BTFSC STATUS, Z
    GOTO last
    INCF PORTC
    GOTO waitforclick
    
last:
    BANKSEL PORTC
    CLRF PORTC
    GOTO waitforclick
    
waitforclick:
    BTFSC PORTD, 0
    GOTO waitforclick
    GOTO loop
    
isr:
    NOP
    RETFIE

    END