Re: PTT with soundmodem

From: Mike Markowski (terhi.victor@logonet.com)
Date: Mon Feb 02 2004 - 17:38:24 EET

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    Thanks, guys, for the replies to my note.

    On Sun 01-Feb-04 at 1709 EST, Hamish Moffatt wrote:
    >
    > Is AX.25 working properly in 2.4.24? I was under the impression that it
    > was never reliable in 2.4, and fixes are going straight to 2.6.

    I don't really know. Though I'm certainly willing to a new kernel -
    and especially if any new soundcard drivers are included! (See
    below.)

    On Mon 02-Feb-04 at 109 EST, Mike Fenske wrote:
    >
    > Which version of soundmodem are you using and which interface for PTT??

    I currently use the serial port for PTT (but will soon switch to
    parallel so I can have rig control on the serial). And I compiled
    soundmodem-0.7 from source.

    On Mon 02-Feb-04 at 719 EST, Tomi Manninen wrote:
    > On Sun, Feb 01, 2004 at 04:55:30PM -0500, Mike Markowski wrote:
    >
    > > sm[15891]: ioctl: SNDCTL_DSP_SYNC: Device or resource busy (16)

    > For some reason this now fails and then PTT is released immediately.
    > Unfortunately the only cause for the failure I can think of, is a
    > poorly written sound card driver (I could be wrong though -- what
    > is your card btw?).

    That might be the problem. I'm using a several-year-old HP Omnibook
    XE3 laptop from work. It has an ESS Maestro3 soundcard, which is
    labeled as Experimental in the kernel config sound menu.

    > You could try forcing the driver to half duplex (in the IO tab in
    > soundmodemconfig) and see if that fixes it.

    I gave it a try, and it keeps the PTT asserted long enough to
    trigger the rig now, but still just briefly and I get the same error.

    > Another remedy might be trying the ALSA driver.

    Ok, I'll go to the ALSA website and read up on it, since I've
    never played with that. I'm hoping I can stick with the laptop,
    but we'll see how it goes... Thanks for the help!

             Mike AB3AP
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