16F84a Counting RA4 Input : output to single LEDs

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16F84a Counting RA4 Input : output to single LEDs

PIC 16F84A Assembler solution...

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For the moment there are some problems in displaying comment text directly so I have re-created Colins entry here:

PIC Assembler solution:

                         ;Project: Count Inputs on RA4
List P = 16F84
#include <p16F84.inc>
__CONFIG 1Bh             ;_CP_OFF & _PWRTE_ON & _WDT_OFF & _RC_OSC

fileA   equ             20h
fileB   equ             21h
swflag equ             25h

                ORG     0               ;Load the code at address 000
SetUp   BSF     03,5                    ;Select Bank1
                MOVLW   10h             ;Put 0001 0000 into W
                MOVWF   05              ;Load TrisA. Make RA4 input. Others output
                BCF     03,5            ;Select Programming area - Bank0
                GOTO    Main

                                        ;1mS delay

_1mS    decfsz fileA,1
                goto    _1mS
                retlw   00

                                        ;100mS delay

_100mS movlw   60h
                movwf   fileB
AA              call    _1mS
                decfsz fileB,1
                goto    AA
                retlw   00

Main    CLRF    swflag
                CLRF    05              ;Clear Port A
Main1   CALL    _1mS
                BTFSS   05,4            ;Test the input line
                GOTO    Main2
                btfsc   swflag,0        ;first time?
                GOTO    Main1
                bsf     swflag,0
                bcf     05,2            ;turn off the third line
                bsf     05,0            ;turn on the first line
                goto    Main1
Main2   btfss   05,0                    ;Is first line ON and no input signal?
                GOTO    Main1

                CLRF    swflag
Main3   CALL    _1mS
                BTFSS   05,4            ;Test the input line
                GOTO    Main4
                btfsc   swflag,0        ;first time?
                GOTO    Main3
                bsf     swflag,0
                bcf     05,0            ;turn off the first line
                bsf     05,1            ;turn on the second line
                goto    Main3
Main4   btfss   05,1                    ;Is second line ON and no input signal?
                GOTO    Main3

                CLRF    swflag
Main5   CALL    _1mS
                BTFSS   05,4            ;Test the input line
                GOTO    Main6
                btfsc   swflag,0        ;first time?
                GOTO    Main5
                bsf     swflag,0
                bcf     05,1            ;turn off the second line
                bsf     05,2            ;turn on the third line
                goto    Main5
Main6   btfss   05,2                    ;Is third line ON and no input signal?
                GOTO    Main5
                GOTO    Main1

                END

For more details:
Colin Mitchell
talking :at: tpg.com.au

End of page: 16F84A RA4 Assembler solution

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