Keypad question - the next step

cica

Hi-

I've been combing this forum as well as other resources and I can't seem to find an answer to this one.

I have a BS2 that has 4 buttons on P0-P3. I've used the debounce code to determine which of the 4 buttons are being pressed, and before reinventing the wheel, I was wondering if anyone has already written a routine to extract a 4-digit code from keypresses.

Specifically, I'm looking for a timer to start upon the first keypress, and if there aren't 4 button presses within 20 seconds, to clear all button presses from memory. I'm also trying to avoid keypress repeats. In this area, I was thinking of not allowing a 2nd, 3rd, 4th press to be recorded until the previous button registers as being released. I'm planning on giving feedback to the user that each keypress has been accepted via the LCD.

I'm pretty sure I can write this, but I'll probably end up filling up the stamps memory

Thanks,
-Tom

boeboy

here it is i have it set up so that it will debug it but you can change that it is just fore starters and hope you like it !!



' {$STAMP BS2}
' {$PBASIC 2.5}

'vars
buttspace VAR Byte
res1··· VAR Bit 'result
res2··· VAR Bit 'result
res3··· VAR Bit 'result
res4··· VAR Bit 'result
butwait CON 20000 '20 seconds
but1··· PIN 0 'pins
but2··· PIN 1
but3··· PIN 2
but4··· PIN 3

main:
BUTTON but1, 0, 255, 0, buttspace , 1, addone:

BUTTON but1, 0, 255, 0, buttspace , 1, addone2:

BUTTON but1, 0, 255, 0, buttspace , 1, addone3:

BUTTON but1, 0, 255, 0, buttspace , 1, addone4:

DEBUG DEC res1

DEBUG DEC res2 ,CR

DEBUG DEC res3 ,CR

DEBUG DEC res4 ,CR

pause·buttwait

res1 = 0
res2 = 0
res3 = 0
res4 = 0
GOTO main


'subs
addone:· 'add 1 to res1
res1 = 1
RETURN

addone2:· 'add 1 to res2
res2 = 1
RETURN

addone3:· 'add 1 to res3
res3 = 1
RETURN

addone4:· 'add 1 to res4
res4 = 1
RETURN