Button woes

Archiver

Here's the problem:

I need one button to select a function and then, after the selection
is made, the program branches where it needs to go.

I have nested the button command in a for next loop. I have tried it
without using the button command, by looking at the state of the
input (switch) pin.

Problem is: The branching occurs to quickly.

I would like the branching to occur upon release of the button, not
before. As the loop increments (x=1, x=2, x=3...) the program
branches each time x is incremented. Not what I what I want. I want
to escape the loop and branch after release of the pusbutton.

Two questions remain:

1) Did I make any sense
2) If so, how is it done.

Thanks

Rich

Archiver

I'm no expert but try this.
top:

for var=1 to ?
if in1=1 then top
pause 10
next var
wait:
if in1=0 then wait
goto ?????
hope this helps
regards victor

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Original Message

---

From: <rbc1956@y...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, April 11, 2001 4:14 PM
Subject: [noparse][[/noparse]basicstamps] Button woes


> Here's the problem:
>
> I need one button to select a function and then, after the selection
> is made, the program branches where it needs to go.
>
> I have nested the button command in a for next loop. I have tried it
> without using the button command, by looking at the state of the
> input (switch) pin.
>
> Problem is: The branching occurs to quickly.
>
> I would like the branching to occur upon release of the button, not
> before. As the loop increments (x=1, x=2, x=3...) the program
> branches each time x is incremented. Not what I what I want. I want
> to escape the loop and branch after release of the pusbutton.
>
> Two questions remain:
>
> 1) Did I make any sense
> 2) If so, how is it done.
>
> Thanks
>
> Rich
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Archiver

>Here's the problem:
>
>I need one button to select a function and then, after the selection
>is made, the program branches where it needs to go.
>
>I have nested the button command in a for next loop. I have tried it
>without using the button command, by looking at the state of the
>input (switch) pin.
>
>Problem is: The branching occurs to quickly.
>
>I would like the branching to occur upon release of the button, not
>before. As the loop increments (x=1, x=2, x=3...) the program
>branches each time x is incremented. Not what I what I want. I want
>to escape the loop and branch after release of the pusbutton.
>
>Two questions remain:
>
>1) Did I make any sense
>2) If so, how is it done.
>

Here is one way, programmatic:

but var in0 ' button on p0, active low.
waiting1:
if but=0 then waiting1 ' wait for button to be up
waiting0:
if but=1 then waiting0 ' wait for button to be down
do_it:
'this happens when button goes down.
goto waiting1


Here is another way, state machine:

new var bit ' new state of button
old var bit ' old state of button
' button on p0.. active low

old=1 ' inactive to start
waiting:
new=in0 ' logic detects 1->0 transition
if old ^ new & old then do_it
'rest of stuff in waiting loop
goto waiting:

do_it:
old=new ' update state
' rest of stuff to do
goto waiting

The formula, )old ^ new & old), uses the XOR operator between the old
and the new state to detect a transition, and then ANDs that with
the old state to narrow it down to the 1-->0 transition. The
programmatic approach is easier to understand and implement
initially, but the state machine approach lends itself more readily
to further development with more inputs and actions.

I hope that helps,

-- regards,
Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com

Archiver

Oops, I put the old=new in the wrong place in the "state" program, so
as it would never detect the return to pushbutton up. Here is a
correction...

new var bit ' new state of button
old var bit ' old state of button
' button on p0.. active low

new=in0 ' starting state
waiting:
old=new
new=in0 ' logic detects 1->0 transition
if old ^ new & old then do_it
'rest of stuff in waiting loop
goto waiting:

do_it:
' stuff to do
goto waiting

-- Tracy

Archiver

You need to use a for / nect loop to determine when the button has bee
npressed, and when pressed, send the program to another for/next loop that
determines when the button is released, once released, run the code
required.
Chris

---

Original Message

---

From: <rbc1956@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, April 12, 2001 4:14 AM
Subject: [noparse][[/noparse]basicstamps] Button woes


> Here's the problem:
>
> I need one button to select a function and then, after the selection
> is made, the program branches where it needs to go.
>
> I have nested the button command in a for next loop. I have tried it
> without using the button command, by looking at the state of the
> input (switch) pin.
>
> Problem is: The branching occurs to quickly.
>
> I would like the branching to occur upon release of the button, not
> before. As the loop increments (x=1, x=2, x=3...) the program
> branches each time x is incremented. Not what I what I want. I want
> to escape the loop and branch after release of the pusbutton.
>
> Two questions remain:
>
> 1) Did I make any sense
> 2) If so, how is it done.
>
> Thanks
>
> Rich
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>