How to pause or wait for 40 microsecond or more
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Posts: 46,084
Hi all,
I am looking for a pulse on pin 1 of a BS2 stamp module and once that
pulse arrives need to wait a given amount of time (from
40microseconds to a few millisecond, user defined) before setting
another pin high. I tried to setup a counter loop but even the first
count takes too long to execute. Is there some way to do this by
looking at the internal clock or is there a function that counts in
microsecond resolution?
Thanks
-Salman
I am looking for a pulse on pin 1 of a BS2 stamp module and once that
pulse arrives need to wait a given amount of time (from
40microseconds to a few millisecond, user defined) before setting
another pin high. I tried to setup a counter loop but even the first
count takes too long to execute. Is there some way to do this by
looking at the internal clock or is there a function that counts in
microsecond resolution?
Thanks
-Salman
Comments
snematic@y... writes:
> Hi all,
> I am looking for a pulse on pin 1 of a BS2 stamp module and once that
> pulse arrives need to wait a given amount of time (from
> 40microseconds to a few millisecond, user defined) before setting
> another pin high. I tried to setup a counter loop but even the first
> count takes too long to execute. Is there some way to do this by
> looking at the internal clock or is there a function that counts in
> microsecond resolution?
> Thanks
> -Salman
I don't think 40 us delay is possible with the BS2. You may try the
following....
Connect a scope to an output pin. Make the output pin high, do some
instruction to waste time, then make the same output pin go low and measure
that pulse.
Browsing the manual, the shortest nap instruction is 1ms.
An alternative is to go to the SX chip (not the BS2SX). If you are doing
simple I/O and are not using alot of the user friendly stamp commands than
the SX is the way to go. Running the SX at 50 Mhz, one instruction takes 20
nS, making your 40us and eternity and an easy to deal with number for the SX.
Parallax sells this SX. The learing curve for the SX is harder than the BS2.
There are advantages to both however.
Ken
[noparse][[/noparse]Non-text portions of this message have been removed]
PULSOUT pin, period
where the period unit is 2us when using BS2. So, if you want a 40us
positive pulse at pin 1, then
INPUT 1
PULSOUT 1, 20
The max. pulse width is near 130 ms.
4L.
Mensaje original
De: smartdim@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=6NdsHeFst7zXnADfNk6jm7vz-4gTqbke5pm6odWy5QNjnORXhMNLq90g0k9ItOBO1ZSWMHBjXx4y]smartdim@a...[/url
Enviado el: jueves, 27 de marzo de 2003 22:53
Para: basicstamps@yahoogroups.com
Asunto: Re: [noparse][[/noparse]basicstamps] How to pause or wait for 40 microsecond or
more
In a message dated 3/27/2003 1:05:06 PM Pacific Standard Time,
snematic@y... writes:
> Hi all,
> I am looking for a pulse on pin 1 of a BS2 stamp module and once that
> pulse arrives need to wait a given amount of time (from
> 40microseconds to a few millisecond, user defined) before setting
> another pin high. I tried to setup a counter loop but even the first
> count takes too long to execute. Is there some way to do this by
> looking at the internal clock or is there a function that counts in
> microsecond resolution?
> Thanks
> -Salman
I don't think 40 us delay is possible with the BS2. You may try the
following....
Connect a scope to an output pin. Make the output pin high, do some
instruction to waste time, then make the same output pin go low and measure
that pulse.
Browsing the manual, the shortest nap instruction is 1ms.
An alternative is to go to the SX chip (not the BS2SX). If you are doing
simple I/O and are not using alot of the user friendly stamp commands than
the SX is the way to go. Running the SX at 50 Mhz, one instruction takes 20
nS, making your 40us and eternity and an easy to deal with number for the
SX.
Parallax sells this SX. The learing curve for the SX is harder than the BS2.
There are advantages to both however.
Ken
[noparse][[/noparse]Non-text portions of this message have been removed]
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fast enough for a 40microsecond delay assuming I setup a for loop as
a means to waste time.
-Salman
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> In a message dated 3/27/2003 1:05:06 PM Pacific Standard Time,
> snematic@y... writes:
>
> > Hi all,
> > I am looking for a pulse on pin 1 of a BS2 stamp module and once
that
> > pulse arrives need to wait a given amount of time (from
> > 40microseconds to a few millisecond, user defined) before setting
> > another pin high. I tried to setup a counter loop but even the
first
> > count takes too long to execute. Is there some way to do this by
> > looking at the internal clock or is there a function that counts
in
> > microsecond resolution?
> > Thanks
> > -Salman
>
> I don't think 40 us delay is possible with the BS2. You may try
the
> following....
>
> Connect a scope to an output pin. Make the output pin high, do some
> instruction to waste time, then make the same output pin go low and
measure
> that pulse.
>
> Browsing the manual, the shortest nap instruction is 1ms.
>
> An alternative is to go to the SX chip (not the BS2SX). If you are
doing
> simple I/O and are not using alot of the user friendly stamp
commands than
> the SX is the way to go. Running the SX at 50 Mhz, one instruction
takes 20
> nS, making your 40us and eternity and an easy to deal with number
for the SX.
>
>
> Parallax sells this SX. The learing curve for the SX is harder than
the BS2.
> There are advantages to both however.
> Ken
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
have a look at:
Timing tables for various commands
on:
http://www.emesystems.com/BS2speed.htm
the shortest command is 41microsecond (high1)on the Bs2P
May be You could use the high or low command on a not used pin
to get a short pause....? but still longer then 40microsecond
and in an loop much longer
good luck Heinz
Original Message
From: "snematic" <snematic@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, March 27, 2003 10:03 PM
Subject: [noparse][[/noparse]basicstamps] How to pause or wait for 40 microsecond or more
> Hi all,
> I am looking for a pulse on pin 1 of a BS2 stamp module and once that
> pulse arrives need to wait a given amount of time (from
> 40microseconds to a few millisecond, user defined) before setting
> another pin high. I tried to setup a counter loop but even the first
> count takes too long to execute. Is there some way to do this by
> looking at the internal clock or is there a function that counts in
> microsecond resolution?
> Thanks
> -Salman
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
as far as I understand:
the pulsout command make the pin high for 2us
but I believe that the whole command needs much longer
and too long for Salman
Correct me if I am wrong
I had some similar problems before and could not solve it
with the pulsout command
Heinz
> You can use de PULSOUT command:
>
> PULSOUT pin, period
>
> where the period unit is 2us when using BS2. So, if you want a 40us
> positive pulse at pin 1, then
>
> INPUT 1
> PULSOUT 1, 20
>
> The max. pulse width is near 130 ms.
>
> 4L.
>
>
>
Mensaje original
> De: smartdim@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=H1Mqajfzal074w1r0C9Xq50Xll3IBgoeqd8PYeU4n1bpQ2-tjtC-uNlkvs7Qybdx3xnd20ryesm65A]smartdim@a...[/url
> Enviado el: jueves, 27 de marzo de 2003 22:53
> Para: basicstamps@yahoogroups.com
> Asunto: Re: [noparse][[/noparse]basicstamps] How to pause or wait for 40 microsecond or
> more
>
>
> In a message dated 3/27/2003 1:05:06 PM Pacific Standard Time,
> snematic@y... writes:
>
> > Hi all,
> > I am looking for a pulse on pin 1 of a BS2 stamp module and once that
> > pulse arrives need to wait a given amount of time (from
> > 40microseconds to a few millisecond, user defined) before setting
> > another pin high. I tried to setup a counter loop but even the first
> > count takes too long to execute. Is there some way to do this by
> > looking at the internal clock or is there a function that counts in
> > microsecond resolution?
> > Thanks
> > -Salman
>
> I don't think 40 us delay is possible with the BS2. You may try the
> following....
>
> Connect a scope to an output pin. Make the output pin high, do some
> instruction to waste time, then make the same output pin go low and
measure
> that pulse.
>
> Browsing the manual, the shortest nap instruction is 1ms.
>
> An alternative is to go to the SX chip (not the BS2SX). If you are doing
> simple I/O and are not using alot of the user friendly stamp commands than
> the SX is the way to go. Running the SX at 50 Mhz, one instruction takes
20
> nS, making your 40us and eternity and an easy to deal with number for the
> SX.
>
>
> Parallax sells this SX. The learing curve for the SX is harder than the
BS2.
> There are advantages to both however.
> Ken
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
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>
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>
>
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>
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>
>
I was wrong, it was a bad reading. Sorry.
The BS? takes too long with read access to EEPROM for the interpreter,
to allow such resolutions between commands.
4L.
Mensaje original
De: HSchwenk_GMX [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=p6cL3G0hH-ulFHZnlDBtYdTIfFBfUZ_Swg4LmRj0QFOEmyrQqHyOb9wzf-h2jQpfaLzZasPPFgY]hschwenk@g...[/url
Enviado el: viernes, 28 de marzo de 2003 00:20
Para: basicstamps@yahoogroups.com
Asunto: Re: [noparse][[/noparse]basicstamps] How to pause or wait for 40 microsecond or
more
Hi 4L,
as far as I understand:
the pulsout command make the pin high for 2us
but I believe that the whole command needs much longer
and too long for Salman
Correct me if I am wrong
I had some similar problems before and could not solve it
with the pulsout command
Heinz
> You can use de PULSOUT command:
>
> PULSOUT pin, period
>
> where the period unit is 2us when using BS2. So, if you want a 40us
> positive pulse at pin 1, then
>
> INPUT 1
> PULSOUT 1, 20
>
> The max. pulse width is near 130 ms.
>
> 4L.
>
>
>
Mensaje original
> De: smartdim@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=XW-xLspKRwweuKWdixWUyajXW8n9snOkzFOMksqlVY6ZVU43rhdxugMB4CLKY5iXWrkMLUpNTg]smartdim@a...[/url
> Enviado el: jueves, 27 de marzo de 2003 22:53
> Para: basicstamps@yahoogroups.com
> Asunto: Re: [noparse][[/noparse]basicstamps] How to pause or wait for 40 microsecond or
> more
>
>
> In a message dated 3/27/2003 1:05:06 PM Pacific Standard Time,
> snematic@y... writes:
>
> > Hi all,
> > I am looking for a pulse on pin 1 of a BS2 stamp module and once that
> > pulse arrives need to wait a given amount of time (from
> > 40microseconds to a few millisecond, user defined) before setting
> > another pin high. I tried to setup a counter loop but even the first
> > count takes too long to execute. Is there some way to do this by
> > looking at the internal clock or is there a function that counts in
> > microsecond resolution?
> > Thanks
> > -Salman
>
> I don't think 40 us delay is possible with the BS2. You may try the
> following....
>
> Connect a scope to an output pin. Make the output pin high, do some
> instruction to waste time, then make the same output pin go low and
measure
> that pulse.
>
> Browsing the manual, the shortest nap instruction is 1ms.
>
> An alternative is to go to the SX chip (not the BS2SX). If you are doing
> simple I/O and are not using alot of the user friendly stamp commands than
> the SX is the way to go. Running the SX at 50 Mhz, one instruction takes
20
> nS, making your 40us and eternity and an easy to deal with number for the
> SX.
>
>
> Parallax sells this SX. The learing curve for the SX is harder than the
BS2.
> There are advantages to both however.
> Ken
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
To UNSUBSCRIBE, just send mail to:
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