Date: Wed, 30 Apr 2014 11:21:43 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Scott Aitken <scott@thismonkey.com>, ticso@cicely.de Cc: freebsd-arm@freebsd.org, Scott Aitken <freebsd-lists-3@thismonkey.com> Subject: Re: USB audio device on Raspberry Pi - link_elf: symbol isa_dmastatus undefined Message-ID: <5360C0A7.9010407@selasky.org> In-Reply-To: <20140430091411.GA45015@utility-01.thismonkey.com> References: <20140425154430.GA76168@utility-01.thismonkey.com> <535A8AEA.1000100@selasky.org> <20140425204134.GA458@cicely7.cicely.de> <20140430091411.GA45015@utility-01.thismonkey.com>
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On 04/30/14 11:14, Scott Aitken wrote: > Hi again, > > good call on the kernel recompile. I added sound and uaudio to the kernel > and low and behold things improved: > > > root@raspberry-pi:/mnt # dmesg > ... > ugen0.4: <danyigao audio equipment> at usbus0 > uaudio0: <danyigao audio equipment DARED AUDIO, class 0/0, rev 2.00/1.00, addr 4> on usbus0 > uaudio0: Play: 96000 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: Play: 48000 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: Play: 44100 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: No recording. > uaudio0: No MIDI sequencer. > pcm0: <USB audio> on uaudio0 > > However, when I play a file to /dev/dsp, I get an error in dmesg: > > root@raspberry-pi:/mnt # cat /bin/ls > /dev/dsp > cat: stdout: Invalid argument > root@raspberry-pi:/mnt # dmesg > ... > pcm0: chn_write(): pcm0:virtual:dsp0.vp0: play interrupt timeout, channel dead > Hi, In the "sys/dev/usb/controller/dwc_otg.c" driver the isochronous method which your audio device is using, is not implemented, because it causes excessive interrupts. So the USB transfer simply times out. --HPS
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