Discussion:
Serial port control
(too old to reply)
Carl Nilsson
2013-12-22 23:01:38 UTC
Permalink
G'day all:
Now with Gambas 3 installed, I want to get on with porting my running
software from VB6/Windows. It requires processing multiple streams
of binary serial data from attached devices. The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm. In addition to
the basic ones, these are inbuffer.size, outbuffer.size,
inbuffer.count, inputMode, input Len(gth), PortOpen and, in
particular, R Threshold and S Threshold. The latter R/S Thresholds
are very useful in allowing the software to get on with other
processing while the buffers are filling - at least that is my understanding.
I ask if whoever wrote the gambas serial control has any plans to
expand it's functionality to the MScomm level in the foreseeable
future or can someone point me to another more comprehensive control
I could use with gambas?
Carl

Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
Randall Morgan
2013-12-23 02:09:23 UTC
Permalink
As I recall gb serial is steam based and so you would handle buffers via
the stream not the serial object.
Post by Carl Nilsson
Now with Gambas 3 installed, I want to get on with porting my running
software from VB6/Windows. It requires processing multiple streams
of binary serial data from attached devices. The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm. In addition to
the basic ones, these are inbuffer.size, outbuffer.size,
inbuffer.count, inputMode, input Len(gth), PortOpen and, in
particular, R Threshold and S Threshold. The latter R/S Thresholds
are very useful in allowing the software to get on with other
processing while the buffers are filling - at least that is my
understanding.
I ask if whoever wrote the gambas serial control has any plans to
expand it's functionality to the MScomm level in the foreseeable
future or can someone point me to another more comprehensive control
I could use with gambas?
Carl
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
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The correct questions however are... What will it cost, and how long will
it take?
Carl Nilsson
2013-12-23 03:15:10 UTC
Permalink
Randall: Thanks for responding. OK, I have looked at the stream
functions: My question was, basically, how do I specify how many
bytes I want to take in from a given serial port at each
instance? For example, on one input I expect a continuous stream of
31 byte packets and I want to take them in for processing 25 (say)
packets at a time, i.e. 775 bytes at a time. Now I don't much mind
if I get a few bytes more or less because I can check for a remainder
part-packet and put it on the front of the next nominal 775 byte
intake - that's part of the processing software - but I don't want
the CPU tied up with that port or stream between intakes of (about)
775 bytes. There are other input streams and data processing to
attend to. I don't see how to do that with the stream functions -
but maybe I'm not understanding how the stream works? I can see that
I could (I think!) read a given number of bytes from a stream, but
does that relieve the CPU from being tied up with that stream until I
read another 775 bytes? Is a stream of indefinite length or does it
have some buffer limit?
Carl
Post by Randall Morgan
As I recall gb serial is steam based and so you would handle buffers via
the stream not the serial object.
Post by Carl Nilsson
Now with Gambas 3 installed, I want to get on with porting my running
software from VB6/Windows. It requires processing multiple streams
of binary serial data from attached devices. The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm. ...(snip)
Carl
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics
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--
If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
------------------------------------------------------------------------------
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Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
Randall Morgan
2013-12-23 03:47:28 UTC
Permalink
It has been a long while since I have used the serial component of GB but I
have a project starting in which I will need to re-acquaint myself with it.
The stream can be setup as blocking or non-blocking. The PC uses either
polling or interrupt when the port is opened. So trying to manage the
serial port at the same level you would in on uC is pointless in most
cases. Just set up the stream and read the bytes you need from there. If
you're concerned about buffer overflow then you may want to close the port
once you have read the bytes you need.

Perhaps someone with more recent experience can help you more.
Post by Carl Nilsson
Randall: Thanks for responding. OK, I have looked at the stream
functions: My question was, basically, how do I specify how many
bytes I want to take in from a given serial port at each
instance? For example, on one input I expect a continuous stream of
31 byte packets and I want to take them in for processing 25 (say)
packets at a time, i.e. 775 bytes at a time. Now I don't much mind
if I get a few bytes more or less because I can check for a remainder
part-packet and put it on the front of the next nominal 775 byte
intake - that's part of the processing software - but I don't want
the CPU tied up with that port or stream between intakes of (about)
775 bytes. There are other input streams and data processing to
attend to. I don't see how to do that with the stream functions -
but maybe I'm not understanding how the stream works? I can see that
I could (I think!) read a given number of bytes from a stream, but
does that relieve the CPU from being tied up with that stream until I
read another 775 bytes? Is a stream of indefinite length or does it
have some buffer limit?
Carl
Post by Randall Morgan
As I recall gb serial is steam based and so you would handle buffers via
the stream not the serial object.
Post by Carl Nilsson
Now with Gambas 3 installed, I want to get on with porting my running
software from VB6/Windows. It requires processing multiple streams
of binary serial data from attached devices. The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm. ...(snip)
Carl
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into
your
Post by Randall Morgan
Post by Carl Nilsson
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
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Post by Randall Morgan
Post by Carl Nilsson
_______________________________________________
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--
If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
------------------------------------------------------------------------------
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organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics
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Post by Randall Morgan
_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!
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_______________________________________________
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--
If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
Carl Nilsson
2013-12-23 04:10:40 UTC
Permalink
Thanks Randall. I guess it's time to try it and play around a
little, which I can't do for a few days. At the moment I'm trying to
look ahead and see where problems might lie. When push comes to
shove, I don't know how these things really work! I follow
recipes! Don't really want to close the port as the data come in
continuously as fast as the device can send them and I don't want to
miss any. (It's attitude sensor data from an inertial management
unit in a light aircraft). Same in principle with another
"continuous" stream of binary GPS data with packets of 124 bytes
coming in at a slower rate of, say, 4 Hz. How "continuous" it is
would depend on the baud rate at which the port is operating. The
RThreashold property of MScomm handles this issue very well. Doesn't
trigger an event until the specified number of bytes is in the serial buffer.
Carl
Post by Randall Morgan
It has been a long while since I have used the serial component of GB but I
have a project starting in which I will need to re-acquaint myself with it.
The stream can be setup as blocking or non-blocking. The PC uses either
polling or interrupt when the port is opened. So trying to manage the
serial port at the same level you would in on uC is pointless in most
cases. Just set up the stream and read the bytes you need from there. If
you're concerned about buffer overflow then you may want to close the port
once you have read the bytes you need.
Perhaps someone with more recent experience can help you more.
Post by Carl Nilsson
Randall: Thanks for responding. OK, I have looked at the stream
functions: My question was, basically, how do I specify how many
bytes I want to take in from a given serial port at each
instance? For example, on one input I expect a continuous stream of
31 byte packets and I want to take them in for processing 25 (say)
packets at a time, i.e. 775 bytes at a time. Now I don't much mind
if I get a few bytes more or less because I can check for a remainder
part-packet and put it on the front of the next nominal 775 byte
intake - that's part of the processing software - but I don't want
the CPU tied up with that port or stream between intakes of (about)
775 bytes. There are other input streams and data processing to
attend to. I don't see how to do that with the stream functions -
but maybe I'm not understanding how the stream works? I can see that
I could (I think!) read a given number of bytes from a stream, but
does that relieve the CPU from being tied up with that stream until I
read another 775 bytes? Is a stream of indefinite length or does it
have some buffer limit?
Carl
Post by Randall Morgan
As I recall gb serial is steam based and so you would handle buffers via
the stream not the serial object.
Post by Carl Nilsson
Now with Gambas 3 installed, I want to get on with porting my running
software from VB6/Windows. It requires processing multiple streams
of binary serial data from attached devices. The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm. ...(snip)
Carl
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into
your
Post by Randall Morgan
Post by Carl Nilsson
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
Pro!
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Post by Randall Morgan
Post by Carl Nilsson
_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
--
If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
-----------------------------------------------------------------
-------------
Post by Carl Nilsson
Post by Randall Morgan
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics
Pro!
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_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!
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_______________________________________________
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--
If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
------------------------------------------------------------------------------
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!
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Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
Randall Morgan
2013-12-23 07:35:33 UTC
Permalink
I think the RTheshold of VB simply sets the byte count that must accumulate
in the receive buffer before a comm event is triggered. It doesn't do
anything else. In the background VB is still polling the buffer and looking
at the byte count. You can do this in GB but you will have to write it
yourself. You would need to simply use the read event on the comm object to
test the byte count. I believe it triggers at 1 byte. Then use that to
trigger your own custom event when your 124 bytes have arrived.

You might also be able to talk Benoit into adding an RThreshold property.
Seems like it might be handy.... At the very least 4Hz is very very slow
for most computers. And setting up a 4Hz polling of the port wouldn't be
hard at all.
Post by Carl Nilsson
Thanks Randall. I guess it's time to try it and play around a
little, which I can't do for a few days. At the moment I'm trying to
look ahead and see where problems might lie. When push comes to
shove, I don't know how these things really work! I follow
recipes! Don't really want to close the port as the data come in
continuously as fast as the device can send them and I don't want to
miss any. (It's attitude sensor data from an inertial management
unit in a light aircraft). Same in principle with another
"continuous" stream of binary GPS data with packets of 124 bytes
coming in at a slower rate of, say, 4 Hz. How "continuous" it is
would depend on the baud rate at which the port is operating. The
RThreashold property of MScomm handles this issue very well. Doesn't
trigger an event until the specified number of bytes is in the serial buffer.
Carl
Post by Randall Morgan
It has been a long while since I have used the serial component of GB but
I
Post by Randall Morgan
have a project starting in which I will need to re-acquaint myself with
it.
Post by Randall Morgan
The stream can be setup as blocking or non-blocking. The PC uses either
polling or interrupt when the port is opened. So trying to manage the
serial port at the same level you would in on uC is pointless in most
cases. Just set up the stream and read the bytes you need from there. If
you're concerned about buffer overflow then you may want to close the port
once you have read the bytes you need.
Perhaps someone with more recent experience can help you more.
Post by Carl Nilsson
Randall: Thanks for responding. OK, I have looked at the stream
functions: My question was, basically, how do I specify how many
bytes I want to take in from a given serial port at each
instance? For example, on one input I expect a continuous stream of
31 byte packets and I want to take them in for processing 25 (say)
packets at a time, i.e. 775 bytes at a time. Now I don't much mind
if I get a few bytes more or less because I can check for a remainder
part-packet and put it on the front of the next nominal 775 byte
intake - that's part of the processing software - but I don't want
the CPU tied up with that port or stream between intakes of (about)
775 bytes. There are other input streams and data processing to
attend to. I don't see how to do that with the stream functions -
but maybe I'm not understanding how the stream works? I can see that
I could (I think!) read a given number of bytes from a stream, but
does that relieve the CPU from being tied up with that stream until I
read another 775 bytes? Is a stream of indefinite length or does it
have some buffer limit?
Carl
Post by Randall Morgan
As I recall gb serial is steam based and so you would handle buffers
via
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
the stream not the serial object.
Post by Carl Nilsson
Now with Gambas 3 installed, I want to get on with porting my
running
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
software from VB6/Windows. It requires processing multiple streams
of binary serial data from attached devices. The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm. ...(snip)
Carl
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business.
Most IT
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
organizations don't have a clear picture of how application
performance
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
affects their revenue. With AppDynamics, you get 100% visibility
into
Post by Randall Morgan
Post by Carl Nilsson
your
Post by Randall Morgan
Post by Carl Nilsson
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
--
If you ask me if it can be done. The answer is YES, it can always be
done.
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
The correct questions however are... What will it cost, and how long
will
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
it take?
-----------------------------------------------------------------
-------------
Post by Carl Nilsson
Post by Randall Morgan
Rapidly troubleshoot problems before they affect your business. Most
IT
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
organizations don't have a clear picture of how application
performance
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
affects their revenue. With AppDynamics, you get 100% visibility into
your
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into
your
Post by Randall Morgan
Post by Carl Nilsson
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
Post by Randall Morgan
Post by Carl Nilsson
_______________________________________________
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--
If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
------------------------------------------------------------------------------
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics
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Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
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organizations don't have a clear picture of how application performance
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If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
nando
2013-12-23 08:55:15 UTC
Permalink
I have used the serial port for 5+ years with Accelerometer and GPS
without fault nor failure on the serial port control.
Some use RTS/CTS, some done.
My suggestion is not to think it needs to mimick what MSComm does
and how you have used MSComm in the past.
Learn what it does and how you can use it for your devices.
I assure you it can certainly do it without fail.
-Nando


---------- Original Message -----------
From: Randall Morgan <***@gmail.com>
To: mailing list for gambas users <gambas-***@lists.sourceforge.net>
Sent: Sun, 22 Dec 2013 23:35:33 -0800
Subject: Re: [Gambas-user] Serial port control
Post by Randall Morgan
I think the RTheshold of VB simply sets the byte count that must accumulate
in the receive buffer before a comm event is triggered. It doesn't do
anything else. In the background VB is still polling the buffer and looking
at the byte count. You can do this in GB but you will have to write it
yourself. You would need to simply use the read event on the comm object to
test the byte count. I believe it triggers at 1 byte. Then use that to
trigger your own custom event when your 124 bytes have arrived.
You might also be able to talk Benoit into adding an RThreshold property.
Seems like it might be handy.... At the very least 4Hz is very very slow
for most computers. And setting up a 4Hz polling of the port wouldn't be
hard at all.
Post by Carl Nilsson
Thanks Randall. I guess it's time to try it and play around a
little, which I can't do for a few days. At the moment I'm trying to
look ahead and see where problems might lie. When push comes to
shove, I don't know how these things really work! I follow
recipes! Don't really want to close the port as the data come in
continuously as fast as the device can send them and I don't want to
miss any. (It's attitude sensor data from an inertial management
unit in a light aircraft). Same in principle with another
"continuous" stream of binary GPS data with packets of 124 bytes
coming in at a slower rate of, say, 4 Hz. How "continuous" it is
would depend on the baud rate at which the port is operating. The
RThreashold property of MScomm handles this issue very well. Doesn't
trigger an event until the specified number of bytes is in the serial buffer.
Carl
Post by Randall Morgan
It has been a long while since I have used the serial component of GB but
I
Post by Randall Morgan
have a project starting in which I will need to re-acquaint myself with
it.
Post by Randall Morgan
The stream can be setup as blocking or non-blocking. The PC uses either
polling or interrupt when the port is opened. So trying to manage the
serial port at the same level you would in on uC is pointless in most
cases. Just set up the stream and read the bytes you need from there. If
you're concerned about buffer overflow then you may want to close the port
once you have read the bytes you need.
Perhaps someone with more recent experience can help you more.
Post by Carl Nilsson
Randall: Thanks for responding. OK, I have looked at the stream
functions: My question was, basically, how do I specify how many
bytes I want to take in from a given serial port at each
instance? For example, on one input I expect a continuous stream of
31 byte packets and I want to take them in for processing 25 (say)
packets at a time, i.e. 775 bytes at a time. Now I don't much mind
if I get a few bytes more or less because I can check for a remainder
part-packet and put it on the front of the next nominal 775 byte
intake - that's part of the processing software - but I don't want
the CPU tied up with that port or stream between intakes of (about)
775 bytes. There are other input streams and data processing to
attend to. I don't see how to do that with the stream functions -
but maybe I'm not understanding how the stream works? I can see that
I could (I think!) read a given number of bytes from a stream, but
does that relieve the CPU from being tied up with that stream until I
read another 775 bytes? Is a stream of indefinite length or does it
have some buffer limit?
Carl
Post by Randall Morgan
As I recall gb serial is steam based and so you would handle buffers
via
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
the stream not the serial object.
Post by Carl Nilsson
Now with Gambas 3 installed, I want to get on with porting my
running
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
software from VB6/Windows. It requires processing multiple streams
of binary serial data from attached devices. The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm. ...(snip)
Carl
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business.
Most IT
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
organizations don't have a clear picture of how application
performance
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
affects their revenue. With AppDynamics, you get 100% visibility
into
Post by Randall Morgan
Post by Carl Nilsson
your
Post by Randall Morgan
Post by Carl Nilsson
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
--
If you ask me if it can be done. The answer is YES, it can always be
done.
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
The correct questions however are... What will it cost, and how long
will
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
it take?
-----------------------------------------------------------------
-------------
Post by Carl Nilsson
Post by Randall Morgan
Rapidly troubleshoot problems before they affect your business. Most
IT
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
organizations don't have a clear picture of how application
performance
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
affects their revenue. With AppDynamics, you get 100% visibility into
your
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
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_______________________________________________
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Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into
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it take?
------------------------------------------------------------------------------
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Australia 7015
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------- End of Original Message -------
nando
2013-12-23 09:03:39 UTC
Permalink
My suggestion to reading 124 bytes from a serial stream....

I use this technique mostly because I want to empty the buffer provided by the control
as much as possible.

I would have one function which is the _read of the serial port.
The only thing it does is accumulate bytes in an array.

I have another function which will ask for 124 bytes from the accumlating array.
If there are not enough, it can block, or return an array of zero long
which would mean not enough came in.
In this case you could also do a small time delay (ie. WAIT 0.1)
just to prevent the CPU from running 100% testing for 124 bytes.


Both of these can be a Gambas Class and the second function is the public function.
You can use _new to instantiate the serial port control.
You don't need to create it at design time.

I used techniques like this and it works like a charm.
-Nando


---------- Original Message -----------
From: Randall Morgan <***@gmail.com>
To: mailing list for gambas users <gambas-***@lists.sourceforge.net>
Sent: Sun, 22 Dec 2013 23:35:33 -0800
Subject: Re: [Gambas-user] Serial port control
Post by Randall Morgan
I think the RTheshold of VB simply sets the byte count that must accumulate
in the receive buffer before a comm event is triggered. It doesn't do
anything else. In the background VB is still polling the buffer and looking
at the byte count. You can do this in GB but you will have to write it
yourself. You would need to simply use the read event on the comm object to
test the byte count. I believe it triggers at 1 byte. Then use that to
trigger your own custom event when your 124 bytes have arrived.
You might also be able to talk Benoit into adding an RThreshold property.
Seems like it might be handy.... At the very least 4Hz is very very slow
for most computers. And setting up a 4Hz polling of the port wouldn't be
hard at all.
Post by Carl Nilsson
Thanks Randall. I guess it's time to try it and play around a
little, which I can't do for a few days. At the moment I'm trying to
look ahead and see where problems might lie. When push comes to
shove, I don't know how these things really work! I follow
recipes! Don't really want to close the port as the data come in
continuously as fast as the device can send them and I don't want to
miss any. (It's attitude sensor data from an inertial management
unit in a light aircraft). Same in principle with another
"continuous" stream of binary GPS data with packets of 124 bytes
coming in at a slower rate of, say, 4 Hz. How "continuous" it is
would depend on the baud rate at which the port is operating. The
RThreashold property of MScomm handles this issue very well. Doesn't
trigger an event until the specified number of bytes is in the serial buffer.
Carl
Post by Randall Morgan
It has been a long while since I have used the serial component of GB but
I
Post by Randall Morgan
have a project starting in which I will need to re-acquaint myself with
it.
Post by Randall Morgan
The stream can be setup as blocking or non-blocking. The PC uses either
polling or interrupt when the port is opened. So trying to manage the
serial port at the same level you would in on uC is pointless in most
cases. Just set up the stream and read the bytes you need from there. If
you're concerned about buffer overflow then you may want to close the port
once you have read the bytes you need.
Perhaps someone with more recent experience can help you more.
Post by Carl Nilsson
Randall: Thanks for responding. OK, I have looked at the stream
functions: My question was, basically, how do I specify how many
bytes I want to take in from a given serial port at each
instance? For example, on one input I expect a continuous stream of
31 byte packets and I want to take them in for processing 25 (say)
packets at a time, i.e. 775 bytes at a time. Now I don't much mind
if I get a few bytes more or less because I can check for a remainder
part-packet and put it on the front of the next nominal 775 byte
intake - that's part of the processing software - but I don't want
the CPU tied up with that port or stream between intakes of (about)
775 bytes. There are other input streams and data processing to
attend to. I don't see how to do that with the stream functions -
but maybe I'm not understanding how the stream works? I can see that
I could (I think!) read a given number of bytes from a stream, but
does that relieve the CPU from being tied up with that stream until I
read another 775 bytes? Is a stream of indefinite length or does it
have some buffer limit?
Carl
Post by Randall Morgan
As I recall gb serial is steam based and so you would handle buffers
via
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
the stream not the serial object.
Post by Carl Nilsson
Now with Gambas 3 installed, I want to get on with porting my
running
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
software from VB6/Windows. It requires processing multiple streams
of binary serial data from attached devices. The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm. ...(snip)
Carl
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business.
Most IT
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
organizations don't have a clear picture of how application
performance
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
affects their revenue. With AppDynamics, you get 100% visibility
into
Post by Randall Morgan
Post by Carl Nilsson
your
Post by Randall Morgan
Post by Carl Nilsson
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Post by Carl Nilsson
_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
--
If you ask me if it can be done. The answer is YES, it can always be
done.
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
The correct questions however are... What will it cost, and how long
will
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
it take?
-----------------------------------------------------------------
-------------
Post by Carl Nilsson
Post by Randall Morgan
Rapidly troubleshoot problems before they affect your business. Most
IT
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
organizations don't have a clear picture of how application
performance
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
affects their revenue. With AppDynamics, you get 100% visibility into
your
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
Post by Randall Morgan
Post by Carl Nilsson
Post by Randall Morgan
_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into
your
Post by Randall Morgan
Post by Carl Nilsson
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
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Post by Randall Morgan
Post by Carl Nilsson
Pro!
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Post by Carl Nilsson
_______________________________________________
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https://lists.sourceforge.net/lists/listinfo/gambas-user
--
If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
------------------------------------------------------------------------------
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Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
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The correct questions however are... What will it cost, and how long will
it take?
------------------------------------------------------------------------------
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------- End of Original Message -------
Mike Crean
2013-12-23 09:30:33 UTC
Permalink
Carl, will you be using the PC end and gambas code as the master or slave, if master then just use the sport read interupt function.
Remember you will have to use chr and asc if using binary data streems. The Gambas3 serial example is very good. If any data is in the input buffer it will trigger the Sport_Read sub and exit leeving the system free to carry on. Just use the PC as master to request data from the slave of slaves.

Private Sport As SerialPort
Const None As Integer = 0
Private RxLen As Integer
Private Rx As String

Public Sub Form_Open()
  Sport = New SerialPort As "Sport"
  Sport.PortName = "/dev/ttyACM0"    'Setup for Arduino you may have to change to ttyUSB0
  Sport.Speed = "57600"
  Sport.Parity = 0
  Sport.DataBits = "8"
  Sport.StopBits = "1"
  Sport.FlowControl = 0
  Sport.Open()
End

Public Sub Sport_Read()
 
  Try Read #Sport, Rx, Lof(Sport)
 
    If Error Then
      Goto NoRx
    Endif
   
    RxLen = InStr(Rx, Chr(13))
    LabelRxlen.Text = RxLen
    ListBox1.Add(Rx)
 
NoRx:

  Rx = ""

End

Best Regards
Mike

Very Merry Christmas to all





On Monday, 23 December 2013 5:03 PM, nando <***@nothingsimple.com> wrote:

My suggestion to reading 124 bytes from a serial stream....

I use this technique mostly because I want to empty the buffer provided by the control
as much as possible.

I would have one function which is the _read of the serial port.
The only thing it does is accumulate bytes in an array.

I have another function which will ask for 124 bytes from the accumlating array.
If there are not enough, it can block, or return an array of zero long
which would mean not enough came in.
In this case you could also do a small time delay (ie. WAIT 0.1)
just to prevent the CPU from running 100% testing for 124 bytes.


Both of these can be a Gambas Class and the second function is the public function.
You can use _new to instantiate the serial port control.
You don't need to create it at design time.

I used techniques like this and it works like a charm.
-Nando


---------- Original Message -----------
From: Randall Morgan <***@gmail.com>
To: mailing list for gambas users <gambas-***@lists.sourceforge.net>
Sent: Sun, 22 Dec 2013 23:35:33 -0800
Subject: Re: [Gambas-user] Serial port control
Post by Randall Morgan
I think the RTheshold of VB simply sets the byte count that must accumulate
in the receive buffer before a comm event is triggered. It doesn't do
anything else. In the background VB is still polling the buffer and looking
at the byte count. You can do this in GB but you will have to write it
yourself. You would need to simply use the read event on the comm object to
test the byte count. I believe it triggers at 1 byte. Then use that to
trigger your own custom event when your 124 bytes have arrived.
You might also be able to talk Benoit into adding an RThreshold property.
Seems like it might be handy.... At the very least 4Hz is very very slow
for most computers. And setting up a 4Hz polling of the port wouldn't be
hard at all.
Thanks Randall.  I guess it's time to try it and play around a
little, which I can't do for a few days.  At the moment I'm trying to
look ahead and see where problems might lie.  When push comes to
shove, I don't know how these things really work!  I follow
recipes!  Don't really want to close the port as the data come in
continuously as fast as the device can send them and I don't want to
miss any.  (It's attitude sensor data from an inertial management
unit in a light aircraft).  Same in principle with another
"continuous" stream of binary GPS data with packets of 124 bytes
coming in at a slower rate of, say, 4 Hz.  How "continuous" it is
would depend on the baud rate at which the port is operating.  The
RThreashold property of MScomm handles this issue very well. Doesn't
trigger an event until the specified number of bytes is in the serial buffer.
Carl
Post by Randall Morgan
It has been a long while since I have used the serial component of GB but
I
Post by Randall Morgan
have a project starting in which I will need to re-acquaint myself with
it.
Post by Randall Morgan
The stream can be setup as blocking or non-blocking. The PC uses either
polling or interrupt when the port is opened. So trying to manage the
serial port at the same level you would in on uC is pointless in most
cases. Just set up the stream and read the bytes you need from there. If
you're concerned about buffer overflow then you may want to close the port
once you have read the bytes you need.
Perhaps someone with more recent experience can help you more.
Randall: Thanks for responding.  OK, I have looked at the stream
functions:  My question was, basically, how do I specify how many
bytes I want to take in from a given serial port at each
instance?  For example, on one input I expect a continuous stream of
31 byte packets and I want to take them in for processing 25 (say)
packets at a time, i.e. 775 bytes at a time.  Now I don't much mind
if I get a few bytes more or less because I can check for a remainder
part-packet and put it on the front of the next nominal 775 byte
intake - that's part of the processing software - but I don't want
the CPU tied up with that port or stream between intakes of (about)
775 bytes.  There are other input streams and data processing to
attend to.  I don't see how to do that with the stream functions -
but maybe I'm not understanding how the stream works?  I can see that
I could (I think!) read a given number of bytes from a stream, but
does that relieve the CPU from being tied up with that stream until I
read another 775 bytes?  Is a stream of indefinite length or does it
have some buffer limit?
Carl
Post by Randall Morgan
As I recall gb serial is steam based and so you would handle buffers
via
Post by Randall Morgan
Post by Randall Morgan
the stream not the serial object.
Post by Carl Nilsson
Now with Gambas 3 installed, I want to get on with porting my
running
Post by Randall Morgan
Post by Randall Morgan
Post by Carl Nilsson
software from VB6/Windows.  It requires processing multiple streams
of binary serial data from attached devices.  The serial control in
gambas 3 does not seem up to the job, in so far as the available
properties lack the elements I use under VB MScomm.  ...(snip)
Carl
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Post by Randall Morgan
Post by Carl Nilsson
Rapidly troubleshoot problems before they affect your business.
Most IT
Post by Randall Morgan
Post by Randall Morgan
Post by Carl Nilsson
organizations don't have a clear picture of how application
performance
Post by Randall Morgan
Post by Randall Morgan
Post by Carl Nilsson
affects their revenue. With AppDynamics, you get 100% visibility
into
Post by Randall Morgan
your
Post by Randall Morgan
Post by Carl Nilsson
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
AppDynamics
Post by Randall Morgan
Post by Carl Nilsson
Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
Post by Randall Morgan
Post by Randall Morgan
Post by Carl Nilsson
_______________________________________________
Gambas-user mailing list
https://lists.sourceforge.net/lists/listinfo/gambas-user
--
If you ask me if it can be done. The answer is YES, it can always be
done.
Post by Randall Morgan
Post by Randall Morgan
The correct questions however are... What will it cost, and how long
will
Post by Randall Morgan
Post by Randall Morgan
it take?
-----------------------------------------------------------------
-------------
Post by Randall Morgan
Rapidly troubleshoot problems before they affect your business. Most
IT
Post by Randall Morgan
Post by Randall Morgan
organizations don't have a clear picture of how application
performance
Post by Randall Morgan
Post by Randall Morgan
affects their revenue. With AppDynamics, you get 100% visibility into
your
Post by Randall Morgan
Post by Randall Morgan
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
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Post by Randall Morgan
Pro!
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_______________________________________________
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Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
Post by Randall Morgan
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into
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_______________________________________________
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--
If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
------------------------------------------------------------------------------
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Lindisfarne, Tas.
Australia 7015
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------- End of Original Message -------
Carl Nilsson
2013-12-23 18:38:55 UTC
Permalink
G'day Guys (Nando, Randall and Mike):
Thanks for your helpful replies. It's 5 am here and I woke up an
hour ago with this matter running through my head, so your replies
are welcome! All good advice. I realized that, first of all, I
needed to get a handle on using the stream functions, which are quite
new to me. Secondly, as usual, there are many ways to skin a
cat. You are right, I need not be dependent on an RThreshold
property. I have been using this for years most successfully with
MScomm in VB6. It does exert efficient control, but sometimes my
incoming packets vary in byte count.. So, early in the piece, I
wrote code that would look for any remainder bytes or shortfall on
the end of the designated input stream and put them onto the start of
the next byte block to get back into synch. The Windows kernel has a
very efficient function called "MoveMemory" that can be called from
VB6. (I presume Linux has something similar). It's very much faster
than shifting bytes in Do loops.

Anyway, not being dependent on an totally accurate byte count prior
to triggering an event suggested an alternate approach: My principal
data device is a decade-old Microstrain Inertial Management Unit
(IMU).that sends remorselessly at around 2356 bytes (sometimes plus a
packet or two) per sec. At the moment I'm doing all my processing on
an old Advantech 9576F single board computer running Win 2K. With
about 8 serial ports in action and heaps of other processing to do, I
wanted to ease things with some preprocessing of some data streams on
one of these little new ARM boards like the Raspberry Pi or
Beaglebone Black - the latter with at least 4 UARTS and running at 1
GHz seems very attractive. They can run fully embedded under Linux
with gambas for initial data processing. I have an RPi now with
gambas3 and wiring Pi installed to experiment with. Sometimes the IMU
traffic is duplex when I change parameters in flight and additional
data packets come back in addition to the normal data flow. So I
adjust the RThreshold value dynamically, but that's not vital. All
this adds up to the fact that another approach might be to trigger
processing events simply with a timer - read the full stream each
time and get the byte count approximately right. With a "MoveMemory"
function I can easily handle some unevenness in byte count. As I
said, I'm looking for the least drain on CPU load. I don't really
need the system tied up waiting and testing for an exact count.

Anyway, I thank you for all your comments. I now know that what I
need can be done and the next step is for me to
experiment. Yesterday I was having some doubts about choosing
gambas. Nice to talk with you guys. I'll get back to you when I
have something more useful to say or ask.
Merry Christmas, Carl
Post by nando
My suggestion to reading 124 bytes from a serial stream....
I use this technique mostly because I want to empty the buffer
provided by the control
as much as possible.
I would have one function which is the _read of the serial port.
The only thing it does is accumulate bytes in an array.
I have another function which will ask for 124 bytes from the
accumlating array.
If there are not enough, it can block, or return an array of zero long
which would mean not enough came in.
In this case you could also do a small time delay (ie. WAIT 0.1)
just to prevent the CPU from running 100% testing for 124 bytes.
Both of these can be a Gambas Class and the second function is the public function.
You can use _new to instantiate the serial port control.
You don't need to create it at design time.
I used techniques like this and it works like a charm.
-Nando
---------- Original Message -----------
Sent: Sun, 22 Dec 2013 23:35:33 -0800
Subject: Re: [Gambas-user] Serial port control
Post by Randall Morgan
I think the RTheshold of VB simply sets the byte count that must accumulate
in the receive buffer before a comm event is triggered. It doesn't do
anything else. In the background VB is still polling the buffer and looking
at the byte count. You can do this in GB but you will have to write it
yourself. You would need to simply use the read event on the comm object to
test the byte count. I believe it triggers at 1 byte. Then use that to
trigger your own custom event when your 124 bytes have arrived.
You might also be able to talk Benoit into adding an RThreshold property.
Seems like it might be handy.... At the very least 4Hz is very very slow
for most computers. And setting up a 4Hz polling of the port wouldn't be
hard at all.
Post by Carl Nilsson
Thanks Randall. I guess it's time to try it and play around a
little, which I can't do for a few days. At the moment I'm trying to
look ahead and see where problems might lie.
(snip)


Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
Mike Crean
2013-12-24 00:22:00 UTC
Permalink
Hi Carl,

I
have a BeagleBone Black up and running with wheezy, LXDE desktop and
Gambas 3.5.9
I am able to use all most all of the available GPIO
and read the AD's using Gambas, I have not had any uarts up. I see no
problem in getting the the uarts to run using standard USB to serial
converters (Jaycar) work well with the Rpi.

I also have Rpi
series B running with the same OS & desktop as the BBB and using
Gambas 3. This is connected to an
Arduino Uno via a usb uart on
the Rpi used to control 6 signals and 7 point motors on a miniature
railway all running at 56000
baud. Using an input from the
terminal the Gambas software sends an ASCII message via the uart to
the Uno and it
will execute the request (change points or
signals) and send back an ASCII message the request was executed.
This is not a very
high speed system as changes may be seconds or
minutes.

I have also used Gambas to communicate with PLC's
using Modbus RTU and crc16 at 9600 baud with high volume short
interval requests over
RS485 networks and up to 20 nodes. The
secret was to use a PC, PLC or RTU as the master and use a timer to
set the pole rate from the master.

I have also as you used VB6
to implement an extensive SCADA system for small power house control.
This was a very high volume data through put and I did not find the
need to use any special data handling to free up the PC. The PC was
off doing a lot of other stuff while the
SCADA was running. I have
implemented a small test SCADA module in Gambas and see no problems
with speed compared to commercial
SCADA packages even when using
the DNP3 protocol. The through put with VB6 or Gambas seemed to be
about double compared to commercial solutions.
I would say I have had best results using an interrupt driven serial
routine to empty the uart buffers and handle the data. VB6 using
OnComm() function and Gambas using Sport_Read() function. Variable
buffer sizes can be dealt with by checking the length of the input
string using CR as the end of line indicator (chr13) as used in most
protocols (modbus ASCII & RTU).

Try something like, Try Print #Sport, Tx; Chr$(13) in a timer
function or from terminal input to send data through the uart.

If needed I have the Gambas modbus test
program and a Koyo Click PLC (under $100 au PLC software is free) to test and see if the
code is still OK, the modbus protocol uses binary data over the comms
link.

Hope this is of some help.

Best
Regards
Mike
Merry Christmas to all.

 





On Tuesday, 24 December 2013 2:38 AM, Carl Nilsson <***@iinet.net.au> wrote:

G'day Guys (Nando, Randall and Mike):
Thanks for your helpful replies.  It's 5 am here and I woke up an
hour ago with this matter running through my head, so your replies
are welcome!  All good advice.  I realized that, first of all, I
needed to get a handle on using the stream functions, which are quite
new to me.  Secondly, as usual, there are many ways to skin a
cat.  You are right, I need not be dependent on an RThreshold
property.  I have been using this for years most successfully with
MScomm in VB6.  It does exert efficient control, but sometimes my
incoming packets vary in byte count..  So, early in the piece, I
wrote code that would look for any remainder bytes or shortfall on
the end of the designated input stream and put them onto the start of
the next byte block to get back into synch.  The Windows kernel has a
very efficient function called "MoveMemory" that can be called from
VB6.  (I presume Linux has something similar).  It's very much faster
than shifting bytes in Do loops.

Anyway, not being dependent on an totally accurate byte count prior
to triggering an event suggested an alternate approach:  My principal
data device is a decade-old  Microstrain Inertial Management Unit
(IMU).that sends remorselessly at around 2356 bytes (sometimes plus a
packet or two) per sec.  At the moment I'm doing all my processing on
an old Advantech 9576F single board computer running Win 2K.  With
about 8 serial ports in action and heaps of other processing to do, I
wanted to ease things with some preprocessing of some data streams on
one of these little new ARM boards like the Raspberry Pi or
Beaglebone Black - the latter with at least 4 UARTS and running at 1
GHz seems very attractive. They can run fully embedded under Linux
with gambas for initial data processing.  I have an RPi now with
gambas3 and wiring Pi installed to experiment with. Sometimes the IMU
traffic is duplex when I change parameters in flight and additional
data packets come back in addition to the normal data flow.  So I
adjust the RThreshold value dynamically, but that's not vital.  All
this adds up to the fact that another approach might be to trigger
processing events simply with a timer - read the full stream each
time and get the byte count approximately right.  With a "MoveMemory"
function I can easily handle some unevenness in byte count.  As I
said, I'm looking for the least drain on CPU load.  I don't really
need the system tied up waiting and testing for an exact count.

Anyway, I thank you for all your comments.  I now know that what I
need can be done and the next step is for me to
experiment.  Yesterday I was having some doubts about choosing
gambas.  Nice to talk with you guys.  I'll get back to you when I
have something more useful to say or ask.
Merry Christmas, Carl
Post by nando
My suggestion to reading 124 bytes from a serial stream....
I use this technique mostly because I want to empty the buffer
provided by the control
as much as possible.
I would have one function which is the _read of the serial port.
The only thing it does is accumulate bytes in an array.
I have another function which will ask for 124 bytes from the
accumlating array.
If there are not enough, it can block, or return an array of zero long
which would mean not enough came in.
In this case you could also do a small time delay (ie. WAIT 0.1)
just to prevent the CPU from running 100% testing for 124 bytes.
Both of these can be a Gambas Class and the second function is the public function.
You can use _new to instantiate the serial port control.
You don't need to create it at design time.
I used techniques like this and it works like a charm.
-Nando
---------- Original Message -----------
Sent: Sun, 22 Dec 2013 23:35:33 -0800
Subject: Re: [Gambas-user] Serial port control
Post by Randall Morgan
I think the RTheshold of VB simply sets the byte count that must accumulate
in the receive buffer before a comm event is triggered. It doesn't do
anything else. In the background VB is still polling the buffer and looking
at the byte count. You can do this in GB but you will have to write it
yourself. You would need to simply use the read event on the comm object to
test the byte count. I believe it triggers at 1 byte. Then use that to
trigger your own custom event when your 124 bytes have arrived.
You might also be able to talk Benoit into adding an RThreshold property.
Seems like it might be handy.... At the very least 4Hz is very very slow
for most computers. And setting up a 4Hz polling of the port wouldn't be
hard at all.
Thanks Randall.  I guess it's time to try it and play around a
little, which I can't do for a few days.  At the moment I'm trying to
look ahead and see where problems might lie.
(snip)


Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
Carl Nilsson
2013-12-24 04:25:42 UTC
Permalink
G'day Mike:
hey, that's great. I have an old fashioned model railway - H0 scale
- which baseboard plus track stands lonely in my hall. Last used in
the 1980's. My young son liked to see things crash a little too much
for my wanting to trust my precious stock, so I bought him a
Scalectrix set instead. Once I got myself an ultralight aircraft in
1997, I have never found time to get back to the railway. Bigger
toys for older boys! I built this Advantech-based computer running
Win 2K for the a/c in about 2006 and have been programming ever
since. I started using an iPAQ PDA h2115 which I still run as a
backup control and display on the dash. VB6 and Appforge MobileVB
came my way at a good price and have done the job well enough. I
have an 8 inch touch screen on the dash for the Win 2K display, which
can display a whole range of pages associated with flight planning,
navigation and attitude (an electronic artificial horizon). I use
OziExplorer to run a moving map display in parallel. (My old eyes
can't see very small maps and labels on the PDA too well). The touch
screen cost me $250 - now I have an 8" Android tablet (cost $160)
with which I plan to replace the screen one day. Now, the tablet has
a 1.5 Ghz dual processor and that can also handle a lot of the
computing I need done. Hence the long term plan of replacing the
Advantech with something like a Beaglebone, in which the latter can
handle all the serial inputs and pre-processing and should make a
better embedded system. (However, as I get more acquainted with
Linux, I get increased respect for how easily I could get stuff done
in Windows!). I also want to implement a wing-leveller - a one-axis
auto pilot. The electronic servo work is largely done - I need to
build the mechanical stuff in the aircraft, which has to be done very
thoughtfully!

On my RaPi series B I used a download of 2012-07-15
wheezy-gambas3-zip from
http://dl.dropbox.com/u/97096067/2012-07-17-wheezy-gambas3.zip which
gave me a gambas 3.2.1. I had the well -documented difficulties with
gambas 3.5 when I installed it on the wheezy which I installed from
the RPi site. Recently I discovered the FTDI mini-module which will
give me four UARTS off one USB port, which will be all I need extra
on the RPi. (I also have the SPI and I2C ports available). I'll
start by augmenting some of the serial data processing on the Pi
which I presently do on the Advantech. When I try to increase the
whole cycle update and display rate beyond about 3 Hz on the present
system, I seem to get into trouble. Not sure what it is, but it just
doesn't seem to have enough time to do the required processing,
display update and attending to all the serial inputs. Palming off
much of the late-stage processing and display to a tablet seems a
good idea for the future, although I'm stumped at the moment at
getting my Pipo S2 tablet to accept a USB to serial converter. I am
confident I will eventually be able to do that, though. At least I
have got the tablet rooted and able to backup the Android ROM, as of yesterday!

That's enough for now - I have to pack. We have quite a lot of
interests in common, it seems, so good to have met you and I hope to
keep in touch!
regards Carl
Post by Mike Crean
Hi Carl,
I
have a BeagleBone Black up and running with wheezy, LXDE desktop and
Gambas 3.5.9
I am able to use all most all of the available GPIO
and read the AD's using Gambas, I have not had any uarts up. I see no
problem in getting the the uarts to run using standard USB to serial
converters (Jaycar) work well with the Rpi.
I also have Rpi
series B running with the same OS & desktop as the BBB and using
Gambas 3. This is connected to an
Arduino Uno via a usb uart on
the Rpi used to control 6 signals and 7 point motors on a miniature
railway all running at 56000
baud. Using an input from the
terminal the Gambas software sends an ASCII message via the uart to
the Uno and it
will execute the request (change points or
signals) and send back an ASCII message the request was executed.
This is not a very
high speed system as changes may be seconds or
minutes.
I have also used Gambas to communicate with PLC's
using Modbus RTU and crc16 at 9600 baud with high volume short
interval requests over
RS485 networks and up to 20 nodes. The
secret was to use a PC, PLC or RTU as the master and use a timer to
set the pole rate from the master.
I have also as you used VB6
to implement an extensive SCADA system for small power house control.
This was a very high volume data through put and I did not find the
need to use any special data handling to free up the PC. The PC was
off doing a lot of other stuff while the
SCADA was running. I have
implemented a small test SCADA module in Gambas and see no problems
with speed compared to commercial
SCADA packages even when using
the DNP3 protocol. The through put with VB6 or Gambas seemed to be
about double compared to commercial solutions.
I would say I have had best results using an interrupt driven serial
routine to empty the uart buffers and handle the data. VB6 using
OnComm() function and Gambas using Sport_Read() function. Variable
buffer sizes can be dealt with by checking the length of the input
string using CR as the end of line indicator (chr13) as used in most
protocols (modbus ASCII & RTU).
Try something like, Try Print #Sport, Tx; Chr$(13) in a timer
function or from terminal input to send data through the uart.
If needed I have the Gambas modbus test
program and a Koyo Click PLC (under $100 au PLC software is free) to test and see if the
code is still OK, the modbus protocol uses binary data over the comms
link.
Hope this is of some help.
Best
Regards
Mike
Merry Christmas to all.
On Tuesday, 24 December 2013 2:38 AM, Carl Nilsson
Thanks for your helpful replies. It's 5 am here and I woke up an
hour ago with this matter running through my head, so your replies
are welcome! All good advice. I realized that, first of all, I
needed to get a handle on using the stream functions, which are quite
new to me. Secondly, as usual, there are many ways to skin a
cat. You are right, I need not be dependent on an RThreshold
property. I have been using this for years most successfully with
MScomm in VB6. It does exert efficient control, but sometimes my
incoming packets vary in byte count.. So, early in the piece, I
wrote code that would look for any remainder bytes or shortfall on
the end of the designated input stream and put them onto the start of
the next byte block to get back into synch. The Windows kernel has a
very efficient function called "MoveMemory" that can be called from
VB6. (I presume Linux has something similar). It's very much faster
than shifting bytes in Do loops.
Anyway, not being dependent on an totally accurate byte count prior
to triggering an event suggested an alternate approach: My principal
data device is a decade-old Microstrain Inertial Management Unit
(IMU).that sends remorselessly at around 2356 bytes (sometimes plus a
packet or two) per sec. At the moment I'm doing all my processing on
an old Advantech 9576F single board computer running Win 2K. With
about 8 serial ports in action and heaps of other processing to do, I
wanted to ease things with some preprocessing of some data streams on
one of these little new ARM boards like the Raspberry Pi or
Beaglebone Black - the latter with at least 4 UARTS and running at 1
GHz seems very attractive. They can run fully embedded under Linux
with gambas for initial data processing. I have an RPi now with
gambas3 and wiring Pi installed to experiment with. Sometimes the IMU
traffic is duplex when I change parameters in flight and additional
data packets come back in addition to the normal data flow. So I
adjust the RThreshold value dynamically, but that's not vital. All
this adds up to the fact that another approach might be to trigger
processing events simply with a timer - read the full stream each
time and get the byte count approximately right. With a "MoveMemory"
function I can easily handle some unevenness in byte count. As I
said, I'm looking for the least drain on CPU load. I don't really
need the system tied up waiting and testing for an exact count.
Anyway, I thank you for all your comments. I now know that what I
need can be done and the next step is for me to
experiment. Yesterday I was having some doubts about choosing
gambas. Nice to talk with you guys. I'll get back to you when I
have something more useful to say or ask.
Merry Christmas, Carl
Post by nando
My suggestion to reading 124 bytes from a serial stream....
I use this technique mostly because I want to empty the buffer provided by the control
as much as possible.
I would have one function which is the _read of the serial port.
The only thing it does is accumulate bytes in an array.
I have another function which will ask for 124 bytes from the
accumlating array.
If there are not enough, it can block, or return an array of zero long
which would mean not enough came in.
In this case you could also do a small time delay (ie. WAIT 0.1)
just to prevent the CPU from running 100% testing for 124 bytes.
Both of these can be a Gambas Class and the second function is the public function.
You can use _new to instantiate the serial port control.
You don't need to create it at design time.
I used techniques like this and it works like a charm.
-Nando
---------- Original Message -----------
Sent: Sun, 22 Dec 2013 23:35:33 -0800
Subject: Re: [Gambas-user] Serial port control
Post by Randall Morgan
I think the RTheshold of VB simply sets the byte count that
must accumulate
Post by nando
Post by Randall Morgan
in the receive buffer before a comm event is triggered. It doesn't do
anything else. In the background VB is still polling the buffer
and looking
Post by nando
Post by Randall Morgan
at the byte count. You can do this in GB but you will have to write it
yourself. You would need to simply use the read event on the
comm object to
Post by nando
Post by Randall Morgan
test the byte count. I believe it triggers at 1 byte. Then use that to
trigger your own custom event when your 124 bytes have arrived.
You might also be able to talk Benoit into adding an RThreshold property.
Seems like it might be handy.... At the very least 4Hz is very very slow
for most computers. And setting up a 4Hz polling of the port wouldn't be
hard at all.
On Sun, Dec 22, 2013 at 8:10 PM, Carl Nilsson
Post by Carl Nilsson
Thanks Randall. I guess it's time to try it and play around a
little, which I can't do for a few days. At the moment I'm trying to
look ahead and see where problems might lie.
(snip)
Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015
------------------------------------------------------------------------------
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------------------------------------------------------------------------------
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
_______________________________________________
Gambas-user mailing list
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Carl S Nilsson
137 Gordons Hill Road
Lindisfarne, Tas.
Australia 7015

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