Hi there,

 

That's odd - do you have WiringPi installed?

 

https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/

 

The script makes use of this excellent program to control the GPIO and also to report on the pin status. Originally I was using the native method of controlling the GPIO using export and echoing a value to the files on the pi. I stumbled onto WiringPi, which makes controlling the pins far simpler and does not require root privs to set them up.

 

Simon

----- Original Message -----
From: "Favati" <smile_k@libero.it>
To: osmocom-sdr@lists.osmocom.org
Sent: Thursday, 9 May, 2013 18:30:51 GMT +00:00 GMT Britain, Ireland, Portugal
Subject: Re: Raspberry Pi based remote SDR head

Il 03/05/2013 01:57, Simon PurplePlaNET ha scritto:
> Hi folks,
>
> I've been messing around with rtl_tcp and an RTL2832 device on a Raspberry Pi and want to add a bank of front end filters and a LNA that can be controlled by the GPIO.
>
> I want to allow manual control of the signal path via a web page hosted on the Pi, but also want to be able to have the filters selected automatically based on the frequency that the RTL device is tuned to.
>
> I noticed that rtl_tcp helpfully echos the frequency changes to the console, so I wrote a simple shell script to gather this data and control the GPIO.
>
> Somebody may have already done this and there is probably a better way to achieve it but, if this would be of any use to you, please feel free to copy and use as you wish.
>
> http://www.purpleplanet.org/?q=rtl-robot
>
> Cheers,
>
> Simon
>
>
>

Just tryed this command:

stdbuf --output=0 rtl_tcp -a 192.168.2.15 -p 1234 > rtl.data

I don't have anything connected to the gpio pins...but i cannot see any
output from your script while changing freqs...(yes, i've gone below
100mhz and above 500mhz).
It's quite strange....the rtl.data is created in the same folder of your
script...
Taking a look at rtl.data, it contains the correct output of the
standard output of rtl_tcp.

Any idea?