running a loop for 10 seconds

Archiver

I've got a simple loop that's looking for an active-high pushbutton
signal on 3 input pins:

firstloop:
IF IN1 = 1 THEN alpha
IF IN2 = 1 THEN bravo
IF IN3 = 1 THEN charlie
GOTO firstloop

When the stamp program is executed, I want to run this loop for 10
seconds, and then switch to a separate subroutine.

How can I make the loop above execute for only 10 seconds? I don't
want to add a pause at the end of each loop in case the momentary
button input happens during that pause. I've thought about using a
FOR-NEXT loop, but that only counts interations of cycles and not time
duration, correct? Any suggestions?

Archiver

In a message dated 2/29/2004 5:27:09 PM Eastern Standard Time,
andywatson@m... writes:


> firstloop:
> IF IN1 = 1 THEN alpha
> IF IN2 = 1 THEN bravo
> IF IN3 = 1 THEN charlie
> GOTO firstloop
>
> When the stamp program is executed, I want to run this loop for 10
> seconds, and then switch to a separate subroutine.
>
> How can I make the loop above execute for only 10 seconds? I don't
> want to add a pause at the end of each loop in case the momentary
> button input happens during that pause. I've thought about using a
> FOR-NEXT loop, but that only counts interations of cycles and not time
> duration, correct? Any suggestions?
>

A Stamp executes 4000 instruction per second - 10 seconds = 40000
instructions. So try this:

x = 0
loop1
.....
....
....
x = x + 1
if x = 10000 then go somewhere else
goto loop1

You might have to adjust the 10000 value for x, but that should be pretty
close.



Sid Weaver
W4EKQ
Port Richey, FL


[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Put a short pad and counter in your loop like this:

DO
IF IN1 = 1 THEN Alpha
IF IN2 = 1 THEN Bravo
IF IN3 = 1 THEN Charlie
PAUSE 25
timer = timer + 1
IF (timer >= 400) THEN EXIT
LOOP
GOTO Main

-- Jon Williams
-- Parallax

---

Original Message

---

From: andy_watson5 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=bKD06DPLDkIMDdXhoocouxQUi5218xsu47XlfOltg-QBQbsxbhjqZZ5gCYW_uLujNsYLNQLXKGIfnA]andywatson@m...[/url
Sent: Sunday, February 29, 2004 4:25 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] running a loop for 10 seconds


I've got a simple loop that's looking for an active-high pushbutton
signal on 3 input pins:

firstloop:
IF IN1 = 1 THEN alpha
IF IN2 = 1 THEN bravo
IF IN3 = 1 THEN charlie
GOTO firstloop

When the stamp program is executed, I want to run this loop for 10
seconds, and then switch to a separate subroutine.

How can I make the loop above execute for only 10 seconds? I don't want
to add a pause at the end of each loop in case the momentary button
input happens during that pause. I've thought about using a FOR-NEXT
loop, but that only counts interations of cycles and not time duration,
correct? Any suggestions?

Archiver

>
> A Stamp executes 4000 instruction per second - 10 seconds = 40000
> instructions.

Is that rate the same for all stamp models? I thought I remembered
seeing a table listing the rate for command executions for each of the
stamp models, but I can't seem to find that table now.

Archiver

In a message dated 2/29/2004 10:05:52 PM Eastern Standard Time,
andywatson@m... writes:


> > A Stamp executes 4000 instruction per second - 10 seconds = 40000
> > instructions.
>
> Is that rate the same for all stamp models? I thought I remembered
> seeing a table listing the rate for command executions for each of the
> stamp models, but I can't seem to find that table now.
>
>

That is for a BS2, and I think a BS2E. Go toe the Paarallax site, under
Stamps, and look at the comparison table. The fastest is the BS2P at 12000 per
sec. If you are using something other than a BS2 just adjust the 10000
accordingly.

Sid


[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Ah, yes. That's where I saw it. Thanks for pointing me in the right
direction. I've read so much documentation lately that I can't
always remember where I find stuff.

I will have to say that I think Parallax does a superb job of making
documentation available online. It's rare to find a company these
days that goes the extra mile when providing product support.

--- In basicstamps@yahoogroups.com, Newzed@a... wrote:
> In a message dated 2/29/2004 10:05:52 PM Eastern Standard Time,
> andywatson@m... writes:
>
>
> > > A Stamp executes 4000 instruction per second - 10 seconds =
40000
> > > instructions.
> >
> > Is that rate the same for all stamp models? I thought I
remembered
> > seeing a table listing the rate for command executions for each
of the
> > stamp models, but I can't seem to find that table now.
> >
> >
>
> That is for a BS2, and I think a BS2E. Go toe the Paarallax site,
under
> Stamps, and look at the comparison table. The fastest is the BS2P
at 12000 per
> sec. If you are using something other than a BS2 just adjust the
10000
> accordingly.
>
> Sid
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

In more detail, each Stamp instruction takes a different amount of
time. You might find this breakdown informative:

http://www.emesystems.com/BS2speed.htm

-- Tracy


>--- In basicstamps@yahoogroups.com, Newzed@a... wrote:
>> In a message dated 2/29/2004 10:05:52 PM Eastern Standard Time,
>> andywatson@m... writes:
>>
>>
>> > > A Stamp executes 4000 instruction per second - 10 seconds =
>40000
>> > > instructions.
> > >
>> > Is that rate the same for all stamp models? I thought I
>remembered
>> > seeing a table listing the rate for command executions for each
>of the
>> > stamp models, but I can't seem to find that table now.
> > >
>> >
>>
>> That is for a BS2, and I think a BS2E. Go toe the Paarallax site,
>under
>> Stamps, and look at the comparison table. The fastest is the BS2P
>at 12000 per
>> sec. If you are using something other than a BS2 just adjust the
>10000
>> accordingly.
>>
>
> > Sid