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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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