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wjasper / Linux_Drivers

Open source Linux device drivers
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analog input scan not working in test-usb1208LS #3

Closed Dan-Lightsource closed 7 years ago

Dan-Lightsource commented 7 years ago

Hi

When I run test-usb1208LS, selecting menu option 'n' to test analog input scan appears to hang forever waiting for some results from the hardware device. I haven't dug too deep yet, except to say that I've confirmed that its stuck in the do-while loop here: https://github.com/wjasper/Linux_Drivers/blob/master/USB/mcc-libusb/usb-1208LS.c#L343

It looks like hid_get_feature_report() in pmd.c is returning -1, but I haven't figured out why yet. Calling hid_error() afterwards returns a NULL string.

Has anyone else encountered this issue?

Thanks, -Dan

P.S. menu option 'i' to test analog input is working fine, so it seems that the USB connection to the 1208LS is ok.

wjasper commented 7 years ago

Dan, I think feature reports are broken in hidapi. That affects the 1208LS and the minilab. devices only. The read use interrupt and bulk transfers.

Dan-Lightsource commented 7 years ago

@wjasper Thanks for your response. MCC confirmed the same, and advised me to use the 1208FS+ product instead to have the continuous sampling option available under Linux.

Perhaps this information could be added in the code, or perhaps the option could be removed?