Or
The python script can just write to EPICs channels contained in the IOC.
Al
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Rod Nussbaumer
Sent: Thursday, February 05, 2015 8:08 AM
To: [email protected]
Subject: Re: Fetching return value from external program call in StreamDevice
Or you could make your python script into a daemon (or something akin to that if not on a Unix-like host), and modify it to be a TCP server that responds to StreamDevice queries via TCP.
--- rod.
On 02/05/2015 09:05 AM, Kasemir, Kay wrote:
> Since you already have the data in python, you could add the python CA
> server to your python code, so your python program is like an IOC,
> directly serving the data via channel access. See
> https://pcaspy.readthedocs.org -Kay
>
>
> On Feb 5, 2015, at 11:58 AM, Christian Pauly<[email protected]>
> wrote:
>
>> Hi
>>
>> I want to read out a little pressure sensor, for which i have already a small python script which reads the sensor (via i2c bus) and prints the sensor value to the terminal. Alternatively, i could also give the sensor value as return value upon program exit.
>>
>>
>> Now i want to read this sensor inside an EPICS IOC.
>> Is it possible, to use StreamDevice for this, by calling the external script / program and evaluating the return value ?
>> Maybe using the "exec" statement in the protocol file ?
>>
>> Reading the sensor takes some time (500ms), so it would be good to do it asynchronously, without blocking the IOC.
>>
>> Or is there any other easy way, without reimplementing all the i2c sensor readout eg inside an ASYN driver in C++ code ?
>>
>>
>> Thanks for any hints or help
>>
>> Best regards,
>> Christian
>>
>>
>>
>> --
>> Dr. Christian Pauly
>> Bergische Universität Wuppertal
>> Fachbereich C - Physik
>> Gaußstraße 20, D-42119 Wuppertal
>> Tel: +49 (0)202 439-2632,
>> Fax: +49 (0)202 439-2662
>>
>>
>
>
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