Re: Command problem

From: Jonathan T Wang <jtwang_at_MIT.EDU> · Date: Sat, 17 Jul 2004 04:25:45 -0400 (EDT)

Sorry, I meant to say that the read() call hangs.

Jonathan

On Sat, 17 Jul 2004, Jonathan T Wang wrote:

> On Fedora Core 1 with a NI PCI-6033E, running a command with stop_arg = 1
> and stop_src = TRIG_COUNT results in a broken pipe error on read.
> Furthermore, the next command executed will hang after the
> comedi_command(comedi_t*, comedi_cmd*) call and return no data.
>
> This behavior is easily seen by running the demo provided with comedilib:
>
> $ ./cmd -N 1
> command before testing:
> start:      now      0
> scan_begin: timer    1000000
> convert:    timer    1000000
> scan_end:   count    4
> stop:       count    1
> first test returned 4 (argument conflict)
> start:      now      0
> scan_begin: timer    4000000
> convert:    timer    1000000
> scan_end:   count    4
> stop:       count    1
> second test returned 0 (success)
> start time: 1090052329.978906
> read: Broken pipe
> end time: 1090052330.010138
> time: 0.031232
>
> $ ./cmd -N 5
> command before testing:
> start:      now      0
> scan_begin: timer    1000000
> convert:    timer    1000000
> scan_end:   count    4
> stop:       count    5
> first test returned 4 (argument conflict)
> start:      now      0
> scan_begin: timer    4000000
> convert:    timer    1000000
> scan_end:   count    4
> stop:       count    5
> second test returned 0 (success)
> start time: 1090052364.920903
>
> <ctrl-C>
>
> $ ./cmd -N 5
> command before testing:
> start:      now      0
> scan_begin: timer    1000000
> convert:    timer    1000000
> scan_end:   count    4
> stop:       count    5
> first test returned 4 (argument conflict)
> start:      now      0
> scan_begin: timer    4000000
> convert:    timer    1000000
> scan_end:   count    4
> stop:       count    5
> second test returned 0 (success)
> start time: 1090052398.601719
> 33807 32964 31646 32221
> 33807 32964 31650 32215
> 33809 32962 31646 32222
> 33809 32963 31650 32219
> 33810 32962 31648 32218
> end time: 1090052398.625012
> time: 0.023293
>
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