jumping to another loop by detecting which switch is pressed

[McMurry]

I have four push up button switch.. each pulled up, and also connected to the PortA 0,1,2,3 respectively.

I am making an infinite loop that will detect if any button switch is pressed, like this:

loop btfss porta,0
goto somewhere
btfss porta,1
goto somewhereelse
.
.
goto loop

However, the code failed to work.

Anyone may help to explain a correct way to do it?

 

[ctownsend]

Re: jumping to another loop by detecting which switch is pre

you probably need some debouncing done with software. (that is if you are not doing it somehow with hardware)

I am not a PIC guy so I can't help you with your code, HOWEVER, I usually do it this way:

Loop:
check if port0.0 = low, if not go to Next
wait delay 50mS
port0.0 = low, now wait here until its high (button released)
jump to a subroutine

Next:
check if port0.1 = low, if not go to Next1
wait delay 50mS
port0.1 = low, now wait here until its high (button released)
jump to a subroutine

Next1:
check if port0.2 = low, if not go to Next2
wait delay 50mS
port0.2 = low, now wait here until its high (button released)
jump to a subroutine

.
.
.
.
GOTO Loop

if you still can't get it, search Google for "debouncing" or "keypad"
you will get your answer.

Good Luck