From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ranch Subject: Re: RaspberryPI and soundmodem PTT Date: Wed, 25 Sep 2013 19:48:42 -0700 Message-ID: <5243A08A.9020607@trinnet.net> References: <52428f657519e5.11288990@wp.pl> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <52428f657519e5.11288990@wp.pl> Sender: linux-hams-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Linux Hams 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 > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-hams" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html