Hi Tomaž! On Jue 16 Aug 2012 03:53:14 Tomaž Šolc escribió: > On 08/13/2012 09:05 PM, Lisandro Damián Nicanor Pérez Meyer wrote: [snip] > > So, if anyone has a usbtmc device, feel free to check the code. > > Hi Lisandro > > I tried your code with a Rohde & Schwarz signal generator. I get the > following error: > > usbtmc version: > Major: 0 > Minor: 0 > Patch: 4 > Release candidate suffix: > GIT describe: 0.0.4 > Product: SMBV, Manufacturer: Rohde & Schwarz GmbH & Co. KG, Serial > number: 257799, Interface number: 0, Vendor ID: 0xaad, Product ID 0x5f, > Path: 0001:0002:00 > Bulk message failed. > Answer to *IDN?: > > There's also a lot of messages like this in the kernel log: > > [ 1079.599627] xhci_hcd 0000:26:00.0: WARN: short transfer on control ep > [ 1079.601630] xhci_hcd 0000:26:00.0: WARN: short transfer on control ep > [ 1079.603628] xhci_hcd 0000:26:00.0: WARN: short transfer on control ep
OK, that's seems strange :-/ > Serial number, interface, vendor, product all look identical to what is > set up on the instrument. > > Also, I had to chown the USB device and manually remove the "usbtmc" > kernel module that was automatically loaded when I plugged in the USB > cable. Correct, I forgot to mention that. > By the way, after I run your test, the device also stops working with > the "usbtmc" kernel driver. This happens when I try to read and write > /dev/usbtmc3: By modprobing usbtmc after running the test? > [ 1967.869816] usbtmc 1-2:1.0: usb_bulk_msg returned -110 > [ 1997.751512] usbtmc 1-2:1.0: Unable to send data, error -110 > > It only started working again after I power cycled the instrument. That seems OK, If I interpret the specs right, the device should halt their bulk endpoints in any error case and wait for a specific control message on the control endpoint to unblock it. Thanks for your testing! -- 127.0.0.1 sweet 127.0.0.1 Lisandro Damián Nicanor Pérez Meyer http://perezmeyer.com.ar/ http://perezmeyer.blogspot.com/
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