Messages in this thread | | | Date | Tue, 25 May 2010 19:34:09 +0200 | From | Johannes Bauer <> | Subject | usbtmc makes Rigol DS1052E oscilloscope crash |
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Hi folks,
I'm experiencing trouble connecting to a Rigol DS1052E oscilloscope via the usbtmc USB class driver. When requesting small amounts of data it works quite nicely, but when requesting a large chunk (i.e. when requesting the whole memory to be transferred), the read aborts, the connection times out and ultimately this leads to the oscilloscope crashing.
The commands I'm executing in the example I have provided are:
Cmd: *IDN? Rigol.Technologies,DS1052E,DS1ED120100155,00.02.04.00.00 Cmd: :WAVEFORM:POINTS:MODE? MAXIMUM Cmd: :RUN Cmd: :FORC Cmd: :CHAN1:MEMD? 1048576 Cmd: :WAV:DATA?
After the ":WAV:DATA?" command, the oscilloscope crashes, here's how it looks before for those who are interested: http://s1.directupload.net/file/d/2169/r3m4l97m_jpg.htm
And after: http://s10.directupload.net/file/d/2169/egvgv7hq_jpg.htm
I've captured the USB traffic which is going on using usbmon, debugfs and wireshark, it's a 5kB pcap file: http://www.file-upload.net/download-2544840/usb_rigol.pcap.html
To further trace the problem, I've patched usbtmc.c to emit some more debug output. Here's the patch: http://pastebin.com/fMkA5xSJ
Here's what the extended dmesg output looks after I applied my patch against 2.6.34 (I annotated it so that it is clear which output is emitted after which read): http://pastebin.com/CXRwxxe8
I really hope this can be resolved, Kind regards, Johannes
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