On 05/14 01:07, Jack wrote: > On 5/14/19 12:26 PM, [email protected] wrote: > > On 05/13 11:24, Jack wrote: > > > On 2019.05.13 23:10, [email protected] wrote: > > > > Hi, > > > > > > > > is it somehow possible to play USB-Audio on a PC without one of these > > > > USB-dongle-"soundcards" (DACs)? > > > > > > > > I searched the web and only got links to those dongles... > > > > > > > > On the other hand: On the forum of the developers board one post > > > > spokes of a "dummy" USB-Audio device... > > > > > > > > How can I acchieve this? > > > > > > > > Thanks for any help in advance! > > > > Cheers! > > > > Meino > > > It's not clear what you really want. Why would you want USB audio without > > > an actual USB audio device? Without a USB audio dongle/device/whatever, > > > what would you have to actually produce sound? I can imagine a "dummy" > > > USB audio device - but I can imagine it for testing the software, but not > > > actually producing any sound, so why would you want it? > > > > > > Jack > > Hi Jack, > > > > I don't wanted to pollute my posting with non-Linux details...but here > > they are: > > > > I habe a Teensy 3.6 by PJRC (=>https://www.pjrc.com/), which has an > > USB-port. This port can be switched between a lot of USB-devices... > > ...one of them is an USB-audio device (output). > > The MK66FX1M0VMD18 uC has beside an FPU a DSP block. > > With a certain (open source) firmware this chip can be used as an > > synthesizer. > > > > To cut costs I wanted no USB dongle to play the sound ... I wanted > > to use my Linux PC as "Mega DAC"...so to say. > > > > Question is: > > How can I create such an "receiver" for USB Audio signals to play > > them live with my PC? > > > > Cheers! > > Meino > > That's very different from what I (and I suspect others) thought about your > first posting. You want to do USB audio input, not output. In this case, I > don't think a usual USB audio device/dongle would even help. My first > suggestion is to just plug the USB from the Teensy into the PC, and see what > dmesg shows, and what lsusb shows. Searching on the manufacturer and device > IDs shown by lsusb might lead to solutions, or at least to further lines of > investigation. Also, the Teeny docs might give more information about what > kind of USB output their audio produces, and I wonder if you might find some > good info on their forum? > > Jack > >
Hi Jack, I already posted a question on the forum. The forum is about the Teensy and not Linux. Answer was: "On a Win PC (I do not use Linux) you have to select the Teensy Audio device (Open Sound Settings) to listen to teensy " I attached a screenshot of the devices I could choose via bootloader trickery. lsusb (the relevant portion) reported this when switch to USB Audio: [ 7722.526825] usb 6-2: new full-speed USB device number 18 using ohci-pci [ 7722.691955] usb 6-2: New USB device found, idVendor=16c0, idProduct=04d2, bcdDevice= 2.77 [ 7722.691962] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 7722.691966] usb 6-2: Product: Teensy Audio [ 7722.691970] usb 6-2: Manufacturer: Teensyduino [ 7722.691973] usb 6-2: SerialNumber: 4991790 [ 7722.700415] hid-generic 0003:16C0:04D2.0009: hidraw3: USB HID v1.11 Device [Teensyduino Teensy Audio] on usb-0000:00:12.0-2/input0 [ 7727.761957] usb 6-2: Warning! Unlikely big volume range (=4095), cval->res is probably wrong. [ 7727.761965] usb 6-2: [49] FU [PCM Playback Volume] ch = 2, val = 0/4095/1 (hidraw is always present and is used to communicate with the bootloader) 'udevadm monitor' shows this when plugging in the Teensy: monitor will print the received events for: UDEV - the event which udev sends out after rule processing KERNEL - the kernel uevent KERNEL[7867.891799] add /devices/pci0000:00/0000:00:12.0/usb6/6-2 (usb) KERNEL[7867.893472] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0 (usb) KERNEL[7867.899759] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A (hid) KERNEL[7867.900306] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A/hidraw/hidraw3 (hidraw) KERNEL[7867.900398] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A (hid) KERNEL[7867.900669] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0 (usb) KERNEL[7867.900869] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1 (usb) KERNEL[7873.197477] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3 (sound) KERNEL[7873.197660] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3/pcmC3D0p (sound) KERNEL[7873.197670] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3/pcmC3D0c (sound) KERNEL[7873.197725] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3/controlC3 (sound) KERNEL[7873.197793] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1 (usb) KERNEL[7873.197862] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.2 (usb) KERNEL[7873.197886] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.2 (usb) KERNEL[7873.197941] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.3 (usb) KERNEL[7873.197964] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.3 (usb) KERNEL[7873.197994] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2 (usb) UDEV [7873.215663] add /devices/pci0000:00/0000:00:12.0/usb6/6-2 (usb) UDEV [7873.217290] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.2 (usb) UDEV [7873.217350] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1 (usb) UDEV [7873.217390] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0 (usb) UDEV [7873.217675] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.2 (usb) UDEV [7873.220101] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.3 (usb) UDEV [7873.220125] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3 (sound) KERNEL[7873.220138] change /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3 (sound) UDEV [7873.220152] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A (hid) UDEV [7873.220167] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3/pcmC3D0c (sound) UDEV [7873.220178] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3/pcmC3D0p (sound) UDEV [7873.220813] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A/hidraw/hidraw3 (hidraw) UDEV [7873.220840] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A (hid) UDEV [7873.221086] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.3 (usb) UDEV [7873.222519] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.0 (usb) UDEV [7873.283760] add /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3/controlC3 (sound) UDEV [7873.284718] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1 (usb) UDEV [7873.304625] bind /devices/pci0000:00/0000:00:12.0/usb6/6-2 (usb) UDEV [7873.306373] change /devices/pci0000:00/0000:00:12.0/usb6/6-2/6-2:1.1/sound/card3 (sound) Anu ideas? Cheers! Meino
