RTL2832U on Raspberry Pi

András Retzler retzlerandras at gmail.com
Mon Dec 23 12:46:44 UTC 2013


Hi Fabio,

I think you should run the following before running any rtl_* commands:
sudo rmmod dvb_usb_rtl28xxu

You may also blacklist the dvb_usb_rtl28xxu kernel module, so it won't load
when you plug in the RTL device.

73!

Andras, HA7ILM



2013/12/23 IZ8MBW Fabio <iz8mbw at yahoo.it>

> Hi.
> I'm trying to install OSMOSdr on a Raspberry Pi.
> I'm following this guide:
> http://www.hamradioscience.com/raspberry-pi-as-remote-server-for-rtl2832u-sdr/
>
> After installing I try to test the RTL2832 USB SDR but I have this error:
>
> root at raspberrypi:~/rtl2832/rtl-sdr/build# rtl_test
> Found 1 device(s):
>   0:  Generic RTL2832U OEM
>
> Using device 0: Generic RTL2832U OEM
>
> Kernel driver is active, or device is claimed by second instance of
> librtlsdr.
> In the first case, please either detach or blacklist the kernel module
> (dvb_usb_rtl28xxu), or enable automatic detaching at compile time.
>
> usb_claim_interface error -6
> Failed to open rtlsdr device #0.
>
>
> This is my lsmod:
>
> root at raspberrypi:~# lsmod
> Module                  Size  Used by
> tun                    18459  2
> i2c_dev                 5557  0
> w1_therm                2921  0
> w1_gpio                 2363  0
> wire                   24832  2 w1_gpio,w1_therm
> cn                      4783  1 wire
> snd_bcm2835            16165  0
> evdev                   9419  1
> r820t                  16279  1
> rtl2832                 8020  1
> snd_soc_bcm2708_i2s     5474  0
> regmap_mmio             2806  1 snd_soc_bcm2708_i2s
> dvb_usb_rtl28xxu       14333  0
> dvb_usb_v2             14860  1 dvb_usb_rtl28xxu
> rc_core                16313  3 dvb_usb_rtl28xxu,dvb_usb_v2
> rtl2830                 7378  1 dvb_usb_rtl28xxu
> snd_soc_core          131268  1 snd_soc_bcm2708_i2s
> dvb_core               92797  3 rtl2830,rtl2832,dvb_usb_v2
> regmap_spi              1897  1 snd_soc_core
> snd_pcm                81593  2 snd_bcm2835,snd_soc_core
> snd_page_alloc          5156  1 snd_pcm
> regmap_i2c              1645  1 snd_soc_core
> snd_compress            8076  1 snd_soc_core
> snd_seq                53769  0
> snd_timer              20133  2 snd_pcm,snd_seq
> snd_seq_device          6473  1 snd_seq
> leds_gpio               2059  0
> led_class               3688  1 leds_gpio
> snd                    61291  7
> snd_bcm2835,snd_soc_core,snd_timer,snd_pcm,snd_seq,snd_seq_device,snd_compress
> i2c_bcm2708             3949  0
>
>
> This is a portion of /var/log/messages
>
> .
> .
> .
> Dec 23 13:15:06 raspberrypi kernel: [    2.369348] usb 1-1: new high-speed
> USB device number 2 using dwc_otg
> Dec 23 13:15:06 raspberrypi kernel: [    2.377867] Indeed it is in host
> mode hprt0 = 00001101
> Dec 23 13:15:06 raspberrypi kernel: [    2.387121] devtmpfs: mounted
> Dec 23 13:15:06 raspberrypi kernel: [    2.399736] Freeing unused kernel
> memory: 144K (c0572000 - c0596000)
> Dec 23 13:15:06 raspberrypi kernel: [    2.590087] usb 1-1: New USB device
> found, idVendor=0424, idProduct=9512
> Dec 23 13:15:06 raspberrypi kernel: [    2.599431] usb 1-1: New USB device
> strings: Mfr=0, Product=0, SerialNumber=0
> Dec 23 13:15:06 raspberrypi kernel: [    2.609377] hub 1-1:1.0: USB hub
> found
> Dec 23 13:15:06 raspberrypi kernel: [    2.615786] hub 1-1:1.0: 3 ports
> detected
> Dec 23 13:15:06 raspberrypi kernel: [    2.899604] usb 1-1.1: new
> high-speed USB device number 3 using dwc_otg
> Dec 23 13:15:06 raspberrypi kernel: [    3.009979] usb 1-1.1: New USB
> device found, idVendor=0424, idProduct=ec00
> Dec 23 13:15:06 raspberrypi kernel: [    3.018605] usb 1-1.1: New USB
> device strings: Mfr=0, Product=0, SerialNumber=0
> Dec 23 13:15:06 raspberrypi kernel: [    3.047105] smsc95xx v1.0.4
> Dec 23 13:15:06 raspberrypi kernel: [    3.124437] smsc95xx 1-1.1:1.0
> eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0
> Ethernet, b8:27:eb:30:43:fd
> Dec 23 13:15:06 raspberrypi kernel: [    3.229549] usb 1-1.3: new
> high-speed USB device number 4 using dwc_otg
> Dec 23 13:15:06 raspberrypi kernel: [    3.352535] usb 1-1.3: New USB
> device found, idVendor=0bda, idProduct=2838
> Dec 23 13:15:06 raspberrypi kernel: [    3.365766] usb 1-1.3: New USB
> device strings: Mfr=1, Product=2, SerialNumber=3
> Dec 23 13:15:06 raspberrypi kernel: [    3.375070] usb 1-1.3: Product:
> RTL2838UHIDIR
> Dec 23 13:15:06 raspberrypi kernel: [    3.381218] usb 1-1.3:
> Manufacturer: Realtek
> Dec 23 13:15:06 raspberrypi kernel: [    3.391654] usb 1-1.3:
> SerialNumber: 00000001
> Dec 23 13:15:06 raspberrypi kernel: [    5.123693]
> bcm2708_i2c_init_pinmode(0,0)
> Dec 23 13:15:06 raspberrypi kernel: [    5.249498]
> bcm2708_i2c_init_pinmode(0,1)
> Dec 23 13:15:06 raspberrypi kernel: [    5.255625] bcm2708_i2c
> bcm2708_i2c.0: BSC0 Controller at 0x20205000 (irq 79) (baudrate 100k)
> Dec 23 13:15:06 raspberrypi kernel: [    5.468627]
> bcm2708_i2c_init_pinmode(1,2)
> Dec 23 13:15:06 raspberrypi kernel: [    5.545257]
> bcm2708_i2c_init_pinmode(1,3)
> Dec 23 13:15:06 raspberrypi kernel: [    5.614064] bcm2708_i2c
> bcm2708_i2c.1: BSC1 Controller at 0x20804000 (irq 79) (baudrate 100k)
> Dec 23 13:15:06 raspberrypi kernel: [    6.451707] usb 1-1.3: dvb_usb_v2:
> found a 'Realtek RTL2832U reference design' in warm state
> Dec 23 13:15:06 raspberrypi kernel: [    6.510309] usbcore: registered new
> interface driver dvb_usb_rtl28xxu
> Dec 23 13:15:06 raspberrypi kernel: [    6.552127] usb 1-1.3: dvb_usb_v2:
> will pass the complete MPEG2 transport stream to the software demuxer
> Dec 23 13:15:06 raspberrypi kernel: [    6.575184] DVB: registering new
> adapter (Realtek RTL2832U reference design)
> Dec 23 13:15:06 raspberrypi kernel: [    6.614879] bcm2708-i2s
> bcm2708-i2s.0: Failed to create debugfs directory
> Dec 23 13:15:06 raspberrypi kernel: [    6.639092] usb 1-1.3: DVB:
> registering adapter 0 frontend 0 (Realtek RTL2832 (DVB-T))...
> Dec 23 13:15:06 raspberrypi kernel: [    6.693199] r820t 2-001a: creating
> new instance
> Dec 23 13:15:06 raspberrypi kernel: [    6.721703] r820t 2-001a: Rafael
> Micro r820t successfully identified
> Dec 23 13:15:06 raspberrypi kernel: [    6.744416] Registered IR keymap
> rc-empty
> Dec 23 13:15:06 raspberrypi kernel: [    6.755520] input: Realtek RTL2832U
> reference design as
> /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/rc/rc0/input0
> Dec 23 13:15:06 raspberrypi kernel: [    6.785036] rc0: Realtek RTL2832U
> reference design as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/rc/rc0
> Dec 23 13:15:06 raspberrypi kernel: [    6.808934] usb 1-1.3: dvb_usb_v2:
> schedule remote query interval to 400 msecs
> Dec 23 13:15:06 raspberrypi kernel: [    6.840041] usb 1-1.3: dvb_usb_v2:
> 'Realtek RTL2832U reference design' successfully initialized and connected
> Dec 23 13:15:06 raspberrypi kernel: [   10.489768] EXT4-fs (mmcblk0p2):
> re-mounted. Opts: (null)
> Dec 23 13:15:06 raspberrypi kernel: [   10.929880] EXT4-fs (mmcblk0p2):
> re-mounted. Opts: (null)
> .
> .
> .
>
> Any idea to how to solve?
> Many thanks!!
>
>
> 73
> Fabio, IZ8MBW
> www.iz8mbw.net
>
>
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