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<== Date ==> <== Thread ==>
Subject: Re: Problem with streamDevice and I/O Intr
From: Dirk Zimoch <[email protected]>
To: Florian Feldbauer <[email protected]>
Cc: [email protected]
Date: Tue, 10 Aug 2010 11:58:54 +0200
Hi Florian,

Looks like a race condition. I have to look in the driver. I fear there is nothing you can do about it.

How does the communication work? You say you get 64 messages in series. What do they look like? All like "t68043F34AAA1\r" (only difference in $(no))? That is the timing of these messages? Do they all come in one burst? Do you have a link to the device documentation?

Dirk

Florian Feldbauer wrote:
Hello all,

I ran into a problem when reading from a serial device using I/O Intr
processing with streamDevice. I receive 64 messages in series and have
one record for each message.
Now and then  I get the error message from epics:

timerQueue INTERNAL ERROR (PANDA:FEMC:PROTO192:THMP:680:CHK:00): timerExpired() unexpected ioAction None

Any idea how to fix this problem?

This is the db:
record (scalcout, "THMP:$(ID):CHK:$(no)")
{
  field (DTYP, "stream")
  field (SCAN, "I/O Intr")
  field (CALC, "((K XOR L) XOR C)==E?(K<<8)+L:LL")
  field (OUT,  "@THMP.proto getMsg($(no)) USBCAN1")
  field (INPC, "$(no)")
  field (INLL, "INV CHK")
}

This is the protocol:
Terminator = CR;
getMsg{
  in "t6804\${2}%(K)2X%(L)2X%(E)2X";
}

This is an example string, which is sent from the device:
t68043F34AAA1\r

Best regards
Florian


Replies:
Re: Problem with streamDevice and I/O Intr Florian Feldbauer
References:
Problem with streamDevice and I/O Intr Florian Feldbauer
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