From: David Ranch <linux-hams@trinnet.net>
To: Linux Hams <linux-hams@vger.kernel.org>
Subject: Re: RaspberryPI and soundmodem PTT
Date: Wed, 25 Sep 2013 19:48:42 -0700 [thread overview]
Message-ID: <5243A08A.9020607@trinnet.net> (raw)
In-Reply-To: <52428f657519e5.11288990@wp.pl>
Hello Waldek,
The RPi has one built-in serial port but in it's default mode, it only
supports TX / RX and GND pins. That won't help you for PTT. Now, what
you can do is invoke one of the RPi's alternative I/O mappings and at
that point, you have full access to the flow control pins (specifically
RTS) that most people use for PTT. Please note, the RPi is a 3.3v
device with limited current so you'll probably need a level shifter to
drive the PTT line on your radio.
http://lavalink.com/2012/04/more-on-raspberry-pi-serial-ports/
Ps. In addition to considering Soundmodem, have you heard of
Direwolf? http://home.comcast.net/~wb2osz/ This soundcard TNC supports
is being actively developed, supports multiple parallel decoders for off
frequency signals, supports multi-bit correction, etc. None of those
times is true of Soundmodem. Oh yeah.. and it has RPi binaries!
--David
On 09/25/2013 12:23 AM, Waldek wrote:
> Hi
>
> I have looking solution on RaspberryPI with soundmodem how to do PTT if I don't have in my radio VOX. When I have use soundmodem on my laptop with linux kernel 2.x ten years ago but driver soundmodem support PTT via RS-232 which working very well with my IC-W2A. But I don't know how to do this on RPI ?
> It is need modify soundmodem driver to possible setting the gpio pin for PTT ?? Maybe exist patch for this ?
>
> 73 Waldek sp2ong
>
>
>
> --
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next prev parent reply other threads:[~2013-09-26 2:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-25 7:23 RaspberryPI and soundmodem PTT Waldek
2013-09-25 7:27 ` marius
2013-09-26 2:48 ` David Ranch [this message]
2013-09-26 5:22 ` Marius Petrescu
2013-09-26 5:34 ` Ray Wells
2013-09-26 6:15 ` Andrew Errington
2014-12-05 14:44 ` Ugo Poddine
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