RaspberryPi && SDR

1. prepare
    #prepare os (there was an old raspbian)
    sudo apt-get update
    sudo apt-get upgrade
    sudo rpi-update
    sudo raspi-config
    #overclock to medium
    #don't load DM on start
    #minimize video memory
    #without this step there were gaps in sound for a half a second every second

    #prepare soft
    sudo apt-get install git libusb-dev libusb-1.0 libtool cmake pkg-config
    git clone git://git.osmocom.org/rtl-sdr.git

2. compile rtl-sdr
    cd rtl-sdr/
    mkdir build
    cd build
    cmake ../ -DINSTALL_UDEV_RULES=ON
    make
    sudo make install
    sudo ldconfig
    sudo make install-udev-rules
3. run
    rtl_tcp -a 192.168.1.3
4. listen to music
    #i've used sdr# (http://sdrsharp.com/) from my laptop
    #but it is possible to use rtl_fm and aplay directly from raspi
    rtl_fm -f 103700000 -s 48000 -g 9 -l 10 - | aplay -t raw -r 48000 -c 1 -f S16_LE

work with usb hid device in slackware

- use libusb to find the device with "lsusb" command

- use libhid to find path to the device report with "lshid"

or detach device with "libhid-detach-device vendorid:productid"

and then call "lsusb -vvv".

- get or set data with

hid_get_input_report

hid_set_output_report