segunda-feira, 18 de Maio de 2015 às 14:48:58 UTC+1, Przemek Klosowski escreveu: > > On Mon, May 18, 2015 at 9:08 AM, Daniel Barbosa <[email protected] > <javascript:>> wrote: > > Hello. > > > > I'm trying to record audio from 3 USB microphones, using ALSA. > > When I connect 1 USB mic directly to the BBB, everything works fine. It > gets > > recognized and it records without any issue. > > However, when I connect the 3 USB mics to a USB hub (that connects to > the > > BBB), the microphones aren't detected by ALSA. The microphones are > connected > > and powered, they are listed by 'lsusb', but ALSA does not recognize > them as > > sound cards and so, the mics can't be used to record sound. > > It could be simply a power problem---how are you powering your system? > If you're drawing extra power for your USB devices the usual advice is > to use a) powered hub b) use the BBB power jack and c) use externally > powered USB devices (like hard drives). >
I am using an external power source on the BBB power jack, with enough power to power everything. It's not a power problem (it doesn't seem to be). I tried using a powered hub, but the usb devices connected to it weren't even detected by the BBB. The microphones I'm using (they are the Playstation Eye, a video camera with a mic) have a light that turns on when they are powered up, and they have the light on. They get listed as USB devices (using the 'lsusb' command), so they are indeed connected. However, when I list the recording devices (not the USB devices) connected to the BBB, nothing gets listed (if I connect just 1 mic directly to the BBB, it gets listed as a recording device). I haven't tried another hub, but it seems odd to detect the mic as a USB device and not as a recording device when it's connected to the hub. To be honest, it seems to be a software issue, some configuration of ALSA but I'm not sure. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
