KeyPad interfacing to BS2

Archiver

I recently purchased 3 EDE1144 keypad chips for my BS2 designs (To
add to the PIC-n-LCD), and I have a few quick questions/requests...

Anyone use these on a BS2? Any problems? I had some trouble getting
communication going at first, then found out they are not inverted
serial like the PIC-n-LCD. Afterward I found that both of my 4 X 4
keypads do NOT match the built-in coding scheme of the EDE1144, so I
wrote a small routine to decode the keys for my keypad. The routine
and my layout are listed below...My question is, does anyone have
some compact code for comparing a string input to one stored in say,
the EEPROM for password input? Or username lookup?

Keypad layout (B.G. Micro Surplus)

1 2 3 A
4 5 6 B
7 8 9 C
* 0 # D

BS2 code to return proper key for this keypad (The EDE1144 returns
ASCII values of keys, I just gosub to the following routine):

KeyScan:
if IN14 = 1 then KeyScan
serin 15,84,[noparse][[/noparse]x]
x=x-48
if x<10 then KeyScan2
x = x - 7
KeyScan2:
lookup x,[noparse][[/noparse]49,50,51,65,52,53,54,66,55,56,57,67,42,48,35,68],y
return

Chris

Archiver

With EDE1144 the keypad layout should be:

0 1 2 3
4 5 6 7
8 9 A B
C D # *



>From: "Knight_Designs" <knight_designs@y...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] KeyPad interfacing to BS2
>Date: Tue, 18 Jun 2002 17:27:45 -0000
>
>I recently purchased 3 EDE1144 keypad chips for my BS2 designs (To
>add to the PIC-n-LCD), and I have a few quick questions/requests...
>
>Anyone use these on a BS2? Any problems? I had some trouble getting
>communication going at first, then found out they are not inverted
>serial like the PIC-n-LCD. Afterward I found that both of my 4 X 4
>keypads do NOT match the built-in coding scheme of the EDE1144, so I
>wrote a small routine to decode the keys for my keypad. The routine
>and my layout are listed below...My question is, does anyone have
>some compact code for comparing a string input to one stored in say,
>the EEPROM for password input? Or username lookup?
>
>Keypad layout (B.G. Micro Surplus)
>
>1 2 3 A
>4 5 6 B
>7 8 9 C
>* 0 # D
>
>BS2 code to return proper key for this keypad (The EDE1144 returns
>ASCII values of keys, I just gosub to the following routine):
>
>KeyScan:
> if IN14 = 1 then KeyScan
> serin 15,84,[noparse][[/noparse]x]
> x=x-48
> if x<10 then KeyScan2
> x = x - 7
>KeyScan2:
> lookup x,[noparse][[/noparse]49,50,51,65,52,53,54,66,55,56,57,67,42,48,35,68],y
> return
>
>Chris
>
>
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>
>




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Archiver

--- Mohamed REFKY <refky@h...> wrote:
> With EDE1144 the keypad layout should be:
>
> 0 1 2 3
> 4 5 6 7
> 8 9 A B
> C D # *

Yes, I understand that...That's why I posted my code,
so you would know that I already corrected for that.
What I was looking for was a string compare routine to
use with my code to check for user password input.

Chris


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