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K3 programming problem

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Neoklis Kyriazis

K3 programming problem

Hi

I have started adding support for the K3 in my ham radio applications for Linux.
I am currently working with my xdemorse app which decodes Morse code via
the sound card and can also control the transceiver (tune in a signal on the

waterfall exactly by changing the frequency of the receiver).

Doing this involves reading the current VFO frequency, correcting it according
to the offset from the center of the waterfall and then sending it to the K3 VFO.
I have gotten all this to work well (I can tune in a CW signal to the nearest 1-2 Hz
just by clicking near the trace!), but in order to read data from the K3 it was

necessary to invoke the posix read() command to pull data from the K3 one byte
at a time, e.g. read( serial_fd, buffer, 1 ) enough times to read all the data (14
times to read the frequency with the FA; command!).

Normally it should have been read( serial_fd, buffer, 14 ) to read all bytes, as it
is done for the FT847/FT857 CAT. I would like to know if the above is the normal
way to read the serial port of the K3 (e.g. one byte at a time), or if I am doing
something wrong here.

My thanks in advance.

Regards Neoklis - Ham Radio Call 5B4AZ
QTH Locator KM64KR
Website: http://www.qsl.net/5b4az/
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N5GE

Re: K3 programming problem

I don't have a Unix system, so can't speak Unix to you but in my personal
application written in C# I do this:

do
{
byteRead = (byte)serialPort.ReadByte();
byteBuffer[bufferedByteCount++] = byteRead;
s = Encoding.ASCII.GetString(byteBuffer, bufferedByteCount - 1, 1);
} while (s != ";");

73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member

"Only the white eyes would believe they could cut the top
off a blanket, sew it to the bottom and have a longer
blanket."

-- American Indian comment about Daylight Saving Time --

On Sun, 29 Jan 2012 12:34:30 -0800 (PST), Neoklis Kyriazis <[hidden email]>
wrote:

>Hi
>
>I have started adding support for the K3 in my ham radio applications for Linux.
>I am currently working with my xdemorse app which decodes Morse code via
>the sound card and can also control the transceiver (tune in a signal on the
>
>waterfall exactly by changing the frequency of the receiver).
>
>Doing this involves reading the current VFO frequency, correcting it according
>to the offset from the center of the waterfall and then sending it to the K3 VFO.
>I have gotten all this to work well (I can tune in a CW signal to the nearest 1-2 Hz
>just by clicking near the trace!), but in order to read data from the K3 it was
>
>necessary to invoke the posix read() command to pull data from the K3 one byte
>at a time, e.g. read( serial_fd, buffer, 1 ) enough times to read all the data (14
>times to read the frequency with the FA; command!).
>
>Normally it should have been read( serial_fd, buffer, 14 ) to read all bytes, as it
>is done for the FT847/FT857 CAT. I would like to know if the above is the normal
>way to read the serial port of the K3 (e.g. one byte at a time), or if I am doing
>something wrong here.
>
>My thanks in advance.
>
>
>
>Regards Neoklis - Ham Radio Call 5B4AZ
>QTH Locator KM64KR
>Website: http://www.qsl.net/5b4az/
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
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Amateur Radio Operator N5GE

Andrew Siegel

Re: K3 programming problem

In reply to this post by Neoklis Kyriazis

Neoklis,

I can't speak definitively on the differences between the Yaesu and the
K3 serial behavior, but I can speak with knowledge on serial I/O in Linux.

The read() system call "attempts to read" the number of bytes you asked
for. This means that when you call it, it will immediately return
whatever is already in the input buffer, up to "count" characters. If
there is nothing in the input buffer, it will either wait for a
character or return immediately, depending on thresholds set with the
tcsetattr() call. The number of characters that it read is returned as
the function value.

So if you call read(serial_fd, buffer, 14), you are not guaranteed to
read 14 characters. The only guarantee is that you won't read *more
than* 14 characters.

So there is some difference in the behavior of the Yaesu and the K3, but
both behaviors are normal. You just need to keep reading until you have
all the bytes you want. I wrote a function to do this:

/* read n characters from fd, guaranteed */
readn(fd,buf,n)
int fd;
char *buf;
int n;

{
int nchars, ret;

for (nchars = 0; nchars < n; nchars += ret) {
ret = read(fd,buf,n-nchars);
if (ret == -1 || ret == 0)
return(ret);
buf += ret;
}
return(n);
}

You may also want to look at the ioctl(fd,FIONREAD,&n) call. This tells
you how many bytes are pending to be read on the specified file descriptor.

Good luck!

73,
Andy, N2CN

Neoklis Kyriazis wrote:

> Hi
>
> I have started adding support for the K3 in my ham radio applications for Linux.
> I am currently working with my xdemorse app which decodes Morse code via
> the sound card and can also control the transceiver (tune in a signal on the
>
> waterfall exactly by changing the frequency of the receiver).
>
> Doing this involves reading the current VFO frequency, correcting it according
> to the offset from the center of the waterfall and then sending it to the K3 VFO.
> I have gotten all this to work well (I can tune in a CW signal to the nearest 1-2 Hz
> just by clicking near the trace!), but in order to read data from the K3 it was
>
> necessary to invoke the posix read() command to pull data from the K3 one byte
> at a time, e.g. read( serial_fd, buffer, 1 ) enough times to read all the data (14
> times to read the frequency with the FA; command!).
>
> Normally it should have been read( serial_fd, buffer, 14 ) to read all bytes, as it
> is done for the FT847/FT857 CAT. I would like to know if the above is the normal
> way to read the serial port of the K3 (e.g. one byte at a time), or if I am doing
> something wrong here.
>
> My thanks in advance.
>
>
>
> Regards Neoklis - Ham Radio Call 5B4AZ
> QTH Locator KM64KR
> Website: http://www.qsl.net/5b4az/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Nate Bargmann

Re: K3 programming problem

In reply to this post by Neoklis Kyriazis

* On 2012 29 Jan 14:36 -0600, Neoklis Kyriazis wrote:

> Hi
>
> I have started adding support for the K3 in my ham radio applications for Linux.
> I am currently working with my xdemorse app which decodes Morse code via
> the sound card and can also control the transceiver (tune in a signal on the
>
> waterfall exactly by changing the frequency of the receiver).
>
> Doing this involves reading the current VFO frequency, correcting it according
> to the offset from the center of the waterfall and then sending it to the K3 VFO.
> I have gotten all this to work well (I can tune in a CW signal to the nearest 1-2 Hz
> just by clicking near the trace!), but in order to read data from the K3 it was
>
> necessary to invoke the posix read() command to pull data from the K3 one byte
> at a time, e.g. read( serial_fd, buffer, 1 ) enough times to read all the data (14
> times to read the frequency with the FA; command!).
>
> Normally it should have been read( serial_fd, buffer, 14 ) to read all bytes, as it
> is done for the FT847/FT857 CAT. I would like to know if the above is the normal
> way to read the serial port of the K3 (e.g. one byte at a time), or if I am doing
> something wrong here.

As Hamlib is available for POSIX and Win32 systems, have you considered
it? If the K3 support is not up to part, let me know. I'd like to
improve it. The upshot for you is that you can write to a single API to
control all manner of rigs. c.f. Fldigi, CQRlog, gpredict, etc.

73, de Nate, N0NB >>

--

"The optimist proclaims that we live in the best of all
possible worlds. The pessimist fears this is true."

Ham radio, Linux, bikes, and more: http://www.n0nb.us
______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Andrew Siegel

Re: K3 programming problem

Yes, I was going to suggest hamlib, too. Once you've programmed for one
rig, you've programmed for all. It's quite a package.

Nate Bargmann wrote:
> As Hamlib is available for POSIX and Win32 systems, have you considered
> it? If the K3 support is not up to part, let me know. I'd like to
> improve it. The upshot for you is that you can write to a single API to
> control all manner of rigs. c.f. Fldigi, CQRlog, gpredict, etc.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

aj4tf

Re: K3 programming problem

In reply to this post by Neoklis Kyriazis

Some links that may be helpful for you:

http://tldp.org/HOWTO/Serial-HOWTO.html

http://tldp.org/HOWTO/Serial-Programming-HOWTO/

73,
David AJ4TF

> ------------------------------
>
> Message: 12
> Date: Sun, 29 Jan 2012 12:34:30 -0800 (PST)
> From: Neoklis Kyriazis <[hidden email]>
> Subject: [Elecraft] K3 programming problem
> To: "[hidden email]" <[hidden email]>
> Message-ID:
> <[hidden email]>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hi
>
> I have started adding support for the K3 in my ham radio applications for Linux.
> I am currently working with my xdemorse app which decodes Morse code via
> the sound card and can also control the transceiver (tune in a signal on the
>
> waterfall exactly by changing the frequency of the receiver).
>
> Doing this involves reading the current VFO frequency, correcting it according
> to the offset from the center of the waterfall and then sending it to the K3 VFO.
> I have gotten all this to work well (I can tune in a CW signal to the nearest 1-2 Hz
> just by clicking near the trace!), but in order to read data from the K3 it was
>
> necessary to invoke the posix? read() command to pull data from the K3 one byte
> at a time, e.g. read( serial_fd, buffer, 1 ) enough times to read all the data (14
> times to read the frequency with the FA; command!).
>
> Normally it should have been read( serial_fd, buffer, 14 ) to read all bytes, as it
> is done for the FT847/FT857 CAT. I would like to know if the above is the normal
> way to read the serial port of the K3 (e.g. one byte at a time), or if I am doing
> something wrong here.
>
> My thanks in advance.
>
>
> ?
> Regards Neoklis - Ham Radio Call 5B4AZ
> QTH Locator KM64KR
> Website: http://www.qsl.net/5b4az/
>
>
> ------------------------------
>
> Message: 13
> Date: Sun, 29 Jan 2012 15:51:13 -0600
> From: [hidden email]