NMEA data and the BS2P
Anyone have any code examples/explainations concerning the use of the BS2P's
scratch pad RAM to store the nmea data? I'm having horrible luck doing searches
for this kind of information.
-Rob
[noparse][[/noparse]Non-text portions of this message have been removed]
scratch pad RAM to store the nmea data? I'm having horrible luck doing searches
for this kind of information.
-Rob
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
rstaph@a... writes:
> Anyone have any code examples/explainations concerning the use of the BS2P's
> scratch pad RAM to store the nmea data? I'm having horrible luck doing
> searches for this kind of information.
>
Download "Logging data with an ETrex GPS and the BS2p" from this link:
http://www.parallaxinc.com/html_files/resources/resources.htm
-- Jon Williams
-- Parallax
[noparse][[/noparse]Non-text portions of this message have been removed]
> > scratch pad RAM to store the nmea data? I'm having horrible luck doing
> > searches for this kind of information.
> >
>
> Download "Logging data with an ETrex GPS and the BS2p" from this link:
>
> http://www.parallaxinc.com/html_files/resources/resources.htm
I can vouch for this.
I use it with my balloon packages and it works like a champ.
Paul
http://www.parallaxinc.com/downloads/Resources/Aero%20GPS%20Brief.PDF for an
ETRAX example This has the code embedded in the pdf file. I've also sent to
you the same .bsp code as sent to me by Jon Williams in a seperate email.
I also have some BS2SX code which does not use the SP RAM and runs at
standard NMEA rate of 4800 bps. Let me know if you want it.
In all cases, it is helpful to be aware that with many GPSs you can change
the NMEA output bit rate to something lower than 4800 bps, bringing lower
speed chips into your list of possibilities.
Regards,
Tony Wells
Original Message
From: "Robert Staph" <rstaph@a...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, January 17, 2002 5:36 AM
Subject: [noparse][[/noparse]basicstamps] NMEA data and the BS2P
> Anyone have any code examples/explainations concerning the use of the
BS2P's scratch pad RAM to store the nmea data? I'm having horrible luck
doing searches for this kind of information.
>
> -Rob
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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>
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example:
SERIN GPSpin,N4800,[noparse][[/noparse]WAIT("$GPRMC"),SPSTR 65]
1. As near as I can tell from the stamp manual, the baudmode value is in
the BS1 format, its obviously fine to use or this wouldn't compile. What
other features like this aren't in the manual and where can I get a list?
2. The SPSTR variable is not declared anywhere. I'm going to guess that
"SPSTR" is short for something like Scratch Pad STRing and the following 65
is the number of bytes to use. Upon a search of the manual (v2.0) SPSTR
did not appear. I've re-read the SERIN and I didn't see an example that did
not define the variable. Storing values in the SPRAM like this without the
GET and PUT commands isn't something I saw in the manual either.
3. Relating to #2, is the first byte of the incoming data stored in the
SPRAM location 0 or 1?
Robert Staph
Original Message
From: <jonwms@a...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, January 17, 2002 7:40 AM
Subject: Re: [noparse][[/noparse]basicstamps] NMEA data and the BS2P
> In a message dated 1/16/02 11:35:40 PM Central Standard Time,
> rstaph@a... writes:
>
>
> > Anyone have any code examples/explainations concerning the use of the
BS2P's
> > scratch pad RAM to store the nmea data? I'm having horrible luck doing
> > searches for this kind of information.
> >
>
> Download "Logging data with an ETrex GPS and the BS2p" from this link:
>
> http://www.parallaxinc.com/html_files/resources/resources.htm
>
>
> -- Jon Williams
> -- Parallax
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
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> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
rstaph@a... writes:
> There is somethings I don't understand about the following code in that
> example:
>
> SERIN GPSpin,N4800,[noparse][[/noparse]WAIT("$GPRMC"),SPSTR 65]
>
> 1. As near as I can tell from the stamp manual, the baudmode value is in
> the BS1 format, its obviously fine to use or this wouldn't compile. What
> other features like this aren't in the manual and where can I get a list?
>
Look closely at the code. There is a CONstant defintion for N4800. This is
not an undocumented feature (as is SPSTR), it's a technique I like to use to
make code easy to read.
> 2. The SPSTR variable is not declared anywhere. I'm going to guess that
> "SPSTR" is short for something like Scratch Pad STRing and the following 65
> is the number of bytes to use. Upon a search of the manual (v2.0) SPSTR
> did not appear. I've re-read the SERIN and I didn't see an example that did
> not define the variable. Storing values in the SPRAM like this without the
> GET and PUT commands isn't something I saw in the manual either.
>
SPSTR (ScratchPad STRing) is a serial modifier that, unfortunately, didn't
make it into the printed manual but is in the online help with the new 1.3
compiler.
What it does is buffer any serial input (SERIN, I2CIN, OWIN, LCDIN) to the
scratchpad RAM, starting at location zero. If you're going to use SPSTR and
the scratchpad for storage, use the upper bytes for storage since the lower
bytes will be clobbered with SPSTR is used.
-- Jon Williams
-- Parallax
[noparse][[/noparse]Non-text portions of this message have been removed]
Original Message
From: "Robert Staph" <rstaph@a...>
To: <basicstamps@yahoogroups.com>
Sent: January 17, 2002 10:47 AM
Subject: Re: [noparse][[/noparse]basicstamps] NMEA data and the BS2P
> Look closely at the code. There is a CONstant defintion for
N4800. This
is
> not an undocumented feature (as is SPSTR), it's a technique I
like to use
to
> make code easy to read.
Guess I missed that one, but that is a good idea to keep it easy
to read.
> > 2. The SPSTR variable is not declared anywhere. I'm going
to guess
that
> > "SPSTR" is short for something like Scratch Pad STRing and
the following
65
> > is the number of bytes to use. Upon a search of the manual
(v2.0)
SPSTR
> > did not appear. I've re-read the SERIN and I didn't see an
example that
did
> > not define the variable. Storing values in the SPRAM like
this without
the
> > GET and PUT commands isn't something I saw in the manual
either.
> >
>
> SPSTR (ScratchPad STRing) is a serial modifier that,
unfortunately, didn't
> make it into the printed manual but is in the online help with
the new 1.3
> compiler.
>
> What it does is buffer any serial input (SERIN, I2CIN, OWIN,
LCDIN) to the
> scratchpad RAM, starting at location zero. If you're going to
use SPSTR
and
> the scratchpad for storage, use the upper bytes for storage
since the
lower
> bytes will be clobbered with SPSTR is used.
What would I add to the following SERIN command if I wanted the
incoming
data to start at X location in the SPRAM instead of 0:
SERIN GPSpin,N4800,[noparse][[/noparse]WAIT("$GPRMC"),SPSTR 65]
Thanks for your time,
Rob
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is
> not an undocumented feature (as is SPSTR), it's a technique I like to use
to
> make code easy to read.
Guess I missed that one, but that is a good idea to keep it easy to read.
> > 2. The SPSTR variable is not declared anywhere. I'm going to guess
that
> > "SPSTR" is short for something like Scratch Pad STRing and the following
65
> > is the number of bytes to use. Upon a search of the manual (v2.0)
SPSTR
> > did not appear. I've re-read the SERIN and I didn't see an example that
did
> > not define the variable. Storing values in the SPRAM like this without
the
> > GET and PUT commands isn't something I saw in the manual either.
> >
>
> SPSTR (ScratchPad STRing) is a serial modifier that, unfortunately, didn't
> make it into the printed manual but is in the online help with the new 1.3
> compiler.
>
> What it does is buffer any serial input (SERIN, I2CIN, OWIN, LCDIN) to the
> scratchpad RAM, starting at location zero. If you're going to use SPSTR
and
> the scratchpad for storage, use the upper bytes for storage since the
lower
> bytes will be clobbered with SPSTR is used.
What would I add to the following SERIN command if I wanted the incoming
data to start at X location in the SPRAM instead of 0:
SERIN GPSpin,N4800,[noparse][[/noparse]WAIT("$GPRMC"),SPSTR 65]
Thanks for your time,
Rob
rstaph@a... writes:
> What would I add to the following SERIN command if I wanted the incoming
>
You can't change the starting offset; the only parameter you can enter is the
number of bytes to buffer. It always starts at location zero.
-- Jon Williams
-- Parallax
[noparse][[/noparse]Non-text portions of this message have been removed]
Robert Staph
Original Message
From: <jonwms@a...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, January 17, 2002 2:52 PM
Subject: Re: [noparse][[/noparse]basicstamps] NMEA data and the BS2P
> In a message dated 1/17/02 12:47:41 PM Central Standard Time,
> rstaph@a... writes:
>
>
> > What would I add to the following SERIN command if I wanted the incoming
> >
>
> You can't change the starting offset; the only parameter you can enter is
the
> number of bytes to buffer. It always starts at location zero.
>
> -- Jon Williams
> -- Parallax
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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Body of the message will be ignored.
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>
Where is the source code hiding? Can't find it under resources/aero%
thanks
mike mocenter
Original Message
From: <jonwms@a...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, January 17, 2002 7:40 AM
Subject: Re: [noparse][[/noparse]basicstamps] NMEA data and the BS2P
> In a message dated 1/16/02 11:35:40 PM Central Standard Time,
> rstaph@a... writes:
>
>
> > Anyone have any code examples/explainations concerning the use of the
BS2P's
> > scratch pad RAM to store the nmea data? I'm having horrible luck doing
> > searches for this kind of information.
> >
>
> Download "Logging data with an ETrex GPS and the BS2p" from this link:
>
> http://www.parallaxinc.com/html_files/resources/resources.htm
>
>
> -- Jon Williams
> -- Parallax
>
>
> [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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>
>