# Setting hw number **URL:** \ **Category:** GNU Radio\ **Created:** [February 16, 2013, 3:33pm UTC](https://www.ruby-forum.com/t/setting-hw-number/226644 "2013-02-16T15:33:30Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Frankie\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/a5b964/32.png) [@Frankie\_R](https://www.ruby-forum.com/u/Frankie_R)\ **Post date:** [February 16, 2013, 3:33pm UTC](https://www.ruby-forum.com/t/setting-hw-number/226644/1 "2013-02-16T15:33:30Z")
Hi All, I’m unable to get simple\_ra to recognize the USRP1. I have carried out the check below but do not know how to set the ‘hw number’ in ‘simple\_ra’ Hope someone is able to help. Many thanks, ## Frank alpha@alpha:~$ cat /proc/asound/cards 0 [Intel]: HDA-Intel - HDA Intel HDA Intel at 0xfdff8000 irq 44 alpha@alpha:~$ * * * alpha@alpha:~$ aplay --list-devices \*\*\*\* List of PLAYBACK Hardware Devices \*\*\*\* card 0: Intel [HDA Intel], device 0: VT2020 Analog [VT2020 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Intel [HDA Intel], device 2: VT2020 HP [VT2020 HP] Subdevices: 1/1 Subdevice #0: subdevice #0 ---
**Author:** ![Frankie\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/a5b964/32.png) [@Frankie\_R](https://www.ruby-forum.com/u/Frankie_R)\ **Post date:** [February 16, 2013, 3:58pm UTC](https://www.ruby-forum.com/t/setting-hw-number/226644/2 "2013-02-16T15:58:03Z")
> Many thanks, > alpha@alpha:~$ aplay --list-devices > \*\*\*\* List of PLAYBACK Hardware Devices \*\*\*\* > card 0: Intel [HDA Intel], device 0: VT2020 Analog [VT2020 Analog] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 0: Intel [HDA Intel], device 2: VT2020 HP [VT2020 HP] > Subdevices: 1/1 > Subdevice #0: subdevice #0 Hi Frank, you are checking for Audio devices, the USRP is a regular USB device, not an audio device. You can see information about your USRP hardware with uhd\_find\_devices, given you use the UHD to interface your USRP. Try to find out if simple\_ra also works with other devices than sound cards. Martin ---
**Author:** ![Frankie\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/a5b964/32.png) [@Frankie\_R](https://www.ruby-forum.com/u/Frankie_R)\ **Post date:** [February 16, 2013, 4:29pm UTC](https://www.ruby-forum.com/t/setting-hw-number/226644/3 "2013-02-16T16:29:37Z")
Hi Martin, OK thanks. I have actually attached a piece of wire to a socket on the USRP and found that it is working. I sent my previous E mail too soon without checking properly! Thanks for the information though. Frank ---
**Author:** ![Frankie\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/a5b964/32.png) [@Frankie\_R](https://www.ruby-forum.com/u/Frankie_R)\ **Post date:** [February 16, 2013, 5:09pm UTC](https://www.ruby-forum.com/t/setting-hw-number/226644/4 "2013-02-16T17:09:55Z")
> Frank > USRP doesn’t “manifest” as a sound device. simple\_ra takes a “–devid” argument that is in the style of the gr-osmosdr device specifier. For USRP1, you’d use: –devid “uhd=a,type=usrp1”