Short update: The LIBUSB error is due to trying to set coupling on the 6022 BE, this is only supported on the Sainsmart DDS120. sr: [00:00.334000] hantek-6xxx: update coupling 0x11 sr: [00:00.338000] hantek-6xxx: hantek_6xxx_write_control: 0xe5 0x11 sr: [00:00.348000] hantek-6xxx: Failed to control transfer: 0xe5: LIBUSB_ERROR_PIPE.
I think hantek-6xxx should be updated to correctly report: - Hantek 6022BE only supports DC coupling - Sainsmart DDS120 supports both AC and DC coupling - Ignore requests to set coupling for the Hantek I'd be happy to supply a patch for this. /Erik 2016-07-31 5:21 GMT-07:00 Erik Montnemery <[email protected]>: > With latest daily build (I tested July 29th 2016) Hantek 6022BE is not > useable in Windows. > > Symptoms: > pulseview: > - Does not capture any data > > sigrok-cli: > - Reports error "sr: hantek-6xxx: Failed to control transfer: 0xe5: > LIBUSB_ERROR_PIPE." > - Only captures date when capturing an amount of samples that is a power of 2 > > With the patch below, both pulseview and sigrok-cli can capture data > although the LIBUSB error remains. > Any idea what is causing the LIBUSB error? > > Note1: I'm not the original author of the patch, it's from reply #359 > here: > http://www.eevblog.com/forum/testgear/sainsmart-dds120-usb-oscilloscope-(buudai-bm102)/350/ > Note2: The patch has only been tested by me in Windows 10 64 bit. > > Suggested patch: > diff --git a/src/hardware/hantek-6xxx/api.c b/src/hardware/hantek-6xxx/api.c > index 8848c91..e81ee04 100644 > --- a/src/hardware/hantek-6xxx/api.c > +++ b/src/hardware/hantek-6xxx/api.c > @@ -531,7 +531,11 @@ static uint32_t data_amount(const struct sr_dev_inst > *sdi) > data_left = devc->samplerate * NUM_CHANNELS; > } > > - data_left += MIN_PACKET_SIZE; /* Driver does not handle small > buffers. */ > + uint32_t i; > + /* Round up to nearest power of two */ > + for (i = MIN_PACKET_SIZE; i < data_left; i *= 2) > + ; > + data_left = i; > > sr_spew("data_amount %u", data_left); ------------------------------------------------------------------------------ _______________________________________________ sigrok-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sigrok-devel
