Setting numbers in memory
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Posts: 46,084
Fellow Stampers,
Quick question before I reinvent the wheel.
I have a need in an application to store 5 single digit numbers in eeprom at
programming time (say 0,0,0,0,0) Then I need to be able to change these numbers
in the feild within the application.
Has anyone got code that will allow me to do this with a couple of buttons
and an LCD display? Preferably on a BS2E if that isn't asking to much.
Then i need the software to be able to read these back out at the time they
are used.
Should I use the stamps eeprom or an external unit?
I have not interfaced an external eeprom to a stamp before, is it as easy as
it sounds (!)
Regards
Tim Stockman
[noparse][[/noparse]Non-text portions of this message have been removed]
Quick question before I reinvent the wheel.
I have a need in an application to store 5 single digit numbers in eeprom at
programming time (say 0,0,0,0,0) Then I need to be able to change these numbers
in the feild within the application.
Has anyone got code that will allow me to do this with a couple of buttons
and an LCD display? Preferably on a BS2E if that isn't asking to much.
Then i need the software to be able to read these back out at the time they
are used.
Should I use the stamps eeprom or an external unit?
I have not interfaced an external eeprom to a stamp before, is it as easy as
it sounds (!)
Regards
Tim Stockman
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
>
> Quick question before I reinvent the wheel.
>
> I have a need in an application to store 5 single digit numbers
>in eeprom at programming time (say 0,0,0,0,0) Then I need to be able
>to change these numbers in the feild within the application.
> Has anyone got code that will allow me to do this with a couple
>of buttons and an LCD display? Preferably on a BS2E if that isn't
>asking to much.
> Then i need the software to be able to read these back out at
>the time they are used.
>
> Should I use the stamps eeprom or an external unit?
>
> I have not interfaced an external eeprom to a stamp before, is
>it as easy as it sounds (!)
>
>Regards
>
>Tim Stockman
Hi Tim,
With only 5 digits to change, and those only occasionally, the BS2e
eeprom should work just fine. The external eeproms are easy to use,
but nowhere near as easy as the built-in!
By "five single digit numbers", do you mean 5 numbers that take on values 0--9?
The user could hold down the first button and watch the LCD display
cycle trough digit number 1-2-3-4-5-1-... They release the button
when the one they want to modify is shown on screen. Then they hold
down the second button and watch the value for that digit cycle
through 0-1-2-...9-0-... They release the button when the digit
they want appears. Is that the kind of interface you are after?
-- Tracy
Thats pretty close to what I'm after.
Yes they are 5 single digit vales from 0-9 stored individually from
locatiosn 0-4
It would be nice to be able to display the current 5 digits (a selcall
ID) and then move the cursor under each digit then be able to change to
selected digit. I am currently using a serial LCD
The idea it to retreive the numbers from eeprom and generate the
relevant tones from a lookup table (that part I have sussed!)
Also another quick question, if I store some data in the 0 program it
seems that I can retreive it from other programs in the BS2e. Is that
susposed to happen or have I just fluked it?
Regards
Original Message
From: "Tracy Allen" <tracy@e...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, July 26, 2001 1:15 AM
Subject: Re: [noparse][[/noparse]basicstamps] Setting numbers in memory
> Hi Tim,
>
> With only 5 digits to change, and those only occasionally, the BS2e
> eeprom should work just fine. The external eeproms are easy to use,
> but nowhere near as easy as the built-in!
>
> By "five single digit numbers", do you mean 5 numbers that take on values
0--9?
>
> The user could hold down the first button and watch the LCD display
> cycle trough digit number 1-2-3-4-5-1-... They release the button
> when the one they want to modify is shown on screen. Then they hold
> down the second button and watch the value for that digit cycle
> through 0-1-2-...9-0-... They release the button when the digit
> they want appears. Is that the kind of interface you are after?
>
> -- Tracy
>
>
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>
>locatiosn 0-4
> It would be nice to be able to display the current 5 digits (a selcall
>ID) and then move the cursor under each digit then be able to change to
>selected digit. I am currently using a serial LCD
> The idea it to retreive the numbers from eeprom and generate the
>relevant tones from a lookup table (that part I have sussed!)
Here is possible pseudocode. There would be lots of ways to do this
with ramifications for user interface comfort.
1) position cursor on lcd, read out the 5 current digits and put
them on screen along with a prompt.
2) position the cursor on top of the first digit, and be sure the
cursor is set to blinking block. The digit will appear to blink
white and black.
3) The user presses the pushbutton #1 repeatedly to position the
cursor over one of the digits to select it.
4) The user presses pushbutton #2 repeatedly to increment the
selected digit in a cyclic manner.
5) The user presses pushbutton #1 for a full 2 seconds to exit the
routine, or else briefly to select another digit.
6) The new selections are recorded in eeprom.
Here is some half-baked code for steps 3 to 5:
testbuttons:
timer=0
buttonstate=inA & %11 ' pushbuttons on P0 and P1, %11=>nothing pressed
branch buttonstate,[noparse][[/noparse]both,just1,just0,neither]
just0:
lcdOffset=lcdOffset+1 // 5 ' position 0,1,2,3,4
lcdPosition=lcdDigitStart+lcdOffset ' where to put the cursor
serout ...[noparse][[/noparse]..lcdposition] ' command to set lcd position, cursor on
waitup0:
timer=timer+1 ' keep track of how long P0 is held down
pause 10
if timer=200 then exitThisRoutineAndWriteData ' this is the exit
branch in0,[noparse][[/noparse]waitup0,testbuttons] ' waitup0 until P0 release or timeout
just1:
digit(i)=digit(i)+1 // 10 ' cycle through digits, one per keypress
serout .... [noparse][[/noparse]48+digit(i), .. lcdPosition] ' send new digit and reposition
waitup1:
branch in0,[noparse][[/noparse]waitup1,testbuttons] ' waitup1 until P1 release
both:
goto testbuttons ' or whatever
neither
goto testbuttons ' or whatever, this might have a time-out
I hope that helps.
-- regards,
Tracy Allen
electronically monitored ecosystems
mailto:tracy@e...
http://www.emesystems.com
> Also another quick question, if I store some data in the 0 program it
>seems that I can retreive it from other programs in the BS2e. Is that
>susposed to happen or have I just fluked it?