PIC Programming Help. Creating a counter but I have some errors in my code

[Liam Porter]

I am attempting to create a simple counter on a PIC16F628A board that will have two inputs, one to increase value, one to decrease and the values will be displayed on a 7 segment display. I have written my code but when I attempt to compile I get these error codes:

Counter.asm:42:Error[118] Overwriting previous address contents: 0x0000 Counter.asm:63:Warning[202] Argument out of range. Least significant bits used. 35 <0x23>

Can anyone help identify where the problem is?

 

<code>LIST P=16f84A, R=Dec

__FUSES _XT_OSC & _WDT_OFF & _CP_OFF & _PWRTE_ON

include “P16f84A.inc”

 

CBLOCK 0x20

W_TEMP

STATUS_TEMP

COUNTER

FLAGS

FILTR1

FILTR2

ENDC

 

 

 

 

#DEFINE ST_BT1 FLAGS,0

#DEFINE ST_BT2 FLAGS,1

 

 

 

 

MIN EQU .0 ;minimum counter value

MAX EQU .15 ;maximum counter value

T_FILTR EQU .255

 

 

CMCON

movlw 0x07

movwf CMCON

 

 

 

 

 

;reset

ORG 0x00

GOTO start

 

 

 

 

 

 

 

ORG 0x04

RETFIE

 

 

 

 

 

 

 

DISP7

MOVF COUNTER,W

ANDLW B’0001111′

 

ADDWF PCL,FLAGS

 

;

RETLW b’11101110′ ;digit 0

RETLW b’00101000′ ;digit 1

RETLW b’11001101′ ;digit 2

RETLW b’01101101′ ;digit 3

RETLW b’00101011′ ;digit 4

RETLW b’01100111′ ;digit 5

RETLW b’11100111′ ;digit 6

RETLW b’00101100′ ;digit 7

RETLW b’11101111′ ;digit 8

RETLW b’00101111′ ;digit 9

RETLW b’10101111′ ;A

RETLW b’11100011′ ;B

RETLW b’11000110′ ;C

RETLW b’11101001′

RETLW b’11000111′ ;E

RETLW b’10000111′ ;F

 

 

 

 

 

start

BCF STATUS,RP0

MOVLW B’00000111′

MOVWF CMCON

 

BSF STATUS,RP0

MOVLW B’00000110′

MOVWF TRISA

 

MOVLW B’00000000′

MOVWF TRISB

MOVLW B’10000000′

MOVWF OPTION_REG

 

 

MOVLW B’00000000′

MOVWF INTCON

BCF STATUS,RP0

 

 

 

 

 

CLRF PORTA

CLRF PORTB

CLRF FLAGS

MOVLW MIN

MOVWF COUNTER

GOTO DISPUP

 

 

 

 

MAIN

MOVLW T_FILTR

MOVWF FILTR1

MOVWF FILTR2

 

CHECK_BUTTON1

BTFSC PORTA,1 ;is button 1 pressed

GOTO BUTTON1_RELEASED

;yes

DECFSZ FILTR1,F

 

GOTO CHECK_BUTTON1

 

BTFSS ST_BT1

GOTO DEC

GOTO CHECK_BUTTON2

 

BUTTON1_RELEASED

BCF ST_BT1

 

CHECK_BUTTON2

BTFSC PORTA,2

GOTO BUTTON2_RELEASED

 

DECFSZ FILTR2,F

 

GOTO CHECK_BUTTON2

 

BTFSS ST_BT2

GOTO INC

GOTO MAIN

 

BUTTON2_RELEASED

BCF ST_BT2

GOTO MAIN

 

DEC

BSF ST_BT1

MOVF COUNTER,W

XORLW MIN

 

 

BTFSC STATUS,Z

GOTO MAIN

 

DECF COUNTER,F

GOTO DISPUP

 

INC

BSF ST_BT2

MOVF COUNTER,W

XORLW MAX

 

 

BTFSC STATUS,Z

GOTO MAIN

 

INCF COUNTER,F

GOTO DISPUP

 

DISPUP

CALL DISP7

 

MOVWF PORTB

 

 

GOTO MAIN

 

 

 

END <code>

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