Experimental Physics and Industrial Control System
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Hi Alan
It is the "flush". Before each out command, I flush the input in order
not to get any old unprocessed input in the queue. However, I found that
when I call flush(), "I/O Intr" records that might be interested in that
input don't get it. Thus I emulated the flush() by reading until the
input queue is empty (and feeding the input to any registered "I/O Intr"
record). I did not think about device that must not be read. I will
check that.
Which asyn port drive do you use? Something from asyn or something
self-written? In the second case, please send me your code.
Dirk
On 08.04.2013 18:40, Alan Greer wrote:
Thank you for the suggestion, I will give it a try.
Kind regards, Alan
On 04/08/2013 04:59 PM, Eric Norum wrote:
Perhaps this could be related to the patch:
StreamDevice-2-6-patch20121113
<http://epics.web.psi.ch/software/streamdevice/StreamDevice-2-6-patch20121113>
Try applying that to the 2-6 code and see if it fixes things.
On Apr 8, 2013, at 8:51 AM, Alan Greer <[email protected]
<mailto:[email protected]>> wrote:
Hi, I have been carrying out some additional tests.
I checked the flush operation in my driver and it does print "flush".
I then started looking at versions. I have discovered that it works
as expected if I use stream device version 2-5 instead of 2-6. In
this situation I see a flush followed by a write.
Kind regards, Alan
On 04/08/2013 04:35 PM, Mark Rivers wrote:
I can't think of any reason why it would be doing a read. asyn
device support does attempt a read at iocInit on many output
records, but not on stringout records.
Could this be from a "flush" operation? Your driver is printing the
message "device read"?
Mark
--
Eric Norum
[email protected] <mailto:[email protected]>
- References:
- Stream Device and Asyn Alan Greer
- RE: Stream Device and Asyn Mark Rivers
- Re: Stream Device and Asyn Alan Greer
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ANJ, 20 Apr 2015 |
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