BS2p input syntax
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Posts: 46,084
Hello everyone,
I have several inputs to a BS2p that are either on or off and wanted
to declare the inputs like this:
remotealarm var bit
motiondetect var bit
doorsensor var bit
question is, what methods are available to assign those to input
pins P0, P1, P2 ?
Is: remotealarm Pin5 one of the ways?
then following that I would need a DIR5 0 since it is an
input.
also need an example of an output bit that has a variable name and a
dedicated Pin.
I have not found any related examples except ones that are too simple
and others that are more involved than I need.
thanks for your help
Bruce
I have several inputs to a BS2p that are either on or off and wanted
to declare the inputs like this:
remotealarm var bit
motiondetect var bit
doorsensor var bit
question is, what methods are available to assign those to input
pins P0, P1, P2 ?
Is: remotealarm Pin5 one of the ways?
then following that I would need a DIR5 0 since it is an
input.
also need an example of an output bit that has a variable name and a
dedicated Pin.
I have not found any related examples except ones that are too simple
and others that are more involved than I need.
thanks for your help
Bruce
Comments
your coding will become easy because the compiler can tell if you want
to use the declared pin as an input (look at the INS register bit) or an
output (set the OUTS register bit).
Like this:
RemoteAlarm PIN 5
MotionDetect PIN 6
DoorSensor PIN 7
IsON CON 1
IsOFF CON 0
So if you write this:
IF (RemoteAlarm = IsON) THEN
' do something
ENDIF
It is the same as writing
IF (IN5 = 1) THEN
' do something
ENDIF
By using the PIN declaration your code will be easier to read and debug,
and you'll be able to adjust the circuit with one edit (PIN declaration
line) versus all the places in your program that might examine that pin.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: etech500 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=juOYbJ3OD_wChC2ujDxXQIjBGn0VC_Ck0WZlyy8t-_MEkmHlfDKTu8sndqcx1tIZM6rxujBBjqgraZQ]bmwbruce@a...[/url
Sent: Saturday, April 10, 2004 1:09 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] BS2p input syntax
Hello everyone,
I have several inputs to a BS2p that are either on or off and wanted
to declare the inputs like this:
remotealarm var bit
motiondetect var bit
doorsensor var bit
question is, what methods are available to assign those to input
pins P0, P1, P2 ?
Is: remotealarm Pin5 one of the ways?
then following that I would need a DIR5 0 since it is an
input.
also need an example of an output bit that has a variable name and a
dedicated Pin.
I have not found any related examples except ones that are too simple
and others that are more involved than I need.
thanks for your help
Bruce
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If you want further explanation of how the PIN typing works, the
following URL may either resolve confusion (or add too it!)
http://www.emesystems.com/BS2pbasic25.htm#PIN_examples
Most of the time, the PIN type will do exactly what you want. But
there are "tricky" uses where you need to understand the underlying
actions.
-- Tracy
>Use the PIN type function (you must declare $PBASIC 2.5 for this) and
>your coding will become easy because the compiler can tell if you want
>to use the declared pin as an input (look at the INS register bit) or an
>output (set the OUTS register bit).
>
>Like this:
>
>RemoteAlarm PIN 5
>MotionDetect PIN 6
>DoorSensor PIN 7
>
>IsON CON 1
>IsOFF CON 0
>
>So if you write this:
>
> IF (RemoteAlarm = IsON) THEN
> ' do something
> ENDIF
>
>It is the same as writing
>
> IF (IN5 = 1) THEN
> ' do something
> ENDIF
>
>By using the PIN declaration your code will be easier to read and debug,
>and you'll be able to adjust the circuit with one edit (PIN declaration
>line) versus all the places in your program that might examine that pin.
>
>-- Jon Williams
>-- Applications Engineer, Parallax
>-- Dallas Office
>
>
>
>
Original Message
>From: etech500 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=xaP4TgyaLlF0DwRjWn7goUUwTrHsisYdYuDkOXpQ44ArBCWifcmVjyR_8aoHVYthH3U0rQ0wig]bmwbruce@a...[/url
>Sent: Saturday, April 10, 2004 1:09 AM
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] BS2p input syntax
>
>
>Hello everyone,
>
>I have several inputs to a BS2p that are either on or off and wanted
>to declare the inputs like this:
>
>remotealarm var bit
>motiondetect var bit
>doorsensor var bit
>
> question is, what methods are available to assign those to input
>pins P0, P1, P2 ?
>
>Is: remotealarm Pin5 one of the ways?
> then following that I would need a DIR5 0 since it is an
>input.
>
>also need an example of an output bit that has a variable name and a
>dedicated Pin.
>
>I have not found any related examples except ones that are too simple
>and others that are more involved than I need.
>
>thanks for your help
>Bruce
>
> Hello everyone,
> I have several inputs to a BS2p that are either on
> or off and wanted
> to declare the inputs like this:
> remotealarm var bit
> motiondetect var bit
> doorsensor var bit
Hey Bruce,
Looks like you're building some sort of Alarm
System. We've designed a few prototype Alarm Systems
with the BS2, and are currently working on an advanced
model using the BS2P40.
> question is, what methods are available to assign
> those to input
> pins P0, P1, P2 ?
>
> Is: remotealarm Pin5 one of the ways?
> then following that I would need a DIR5 0
> since it is an
> input.
remotealarm pin 5
This would work. As for the DIR5 0, well you can set
up the DIRS for all pins with one command during the
Initialization in your code. That's what I do.
DIRS %1110001110001110 as an example.
Hope this helps!
=====
Chris Savage
Knight Designs
324 West Main Street
Montour Falls, NY 14865
(607) 535-6777
http://www.knightdesigns.com
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