Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Fri, 28 Mar 2014 16:25:16 +0100

Hi Christian

Best you write an asynOctet driver.

Dirk

On 26.03.2014 14:11, Christian Pauly wrote:

Dear folks
I am trying to provide EPICS support for a magnetic field Hall sensor
which is connected to a RaspberryPi via SPI bus.
I want to run an EPICS-IOC on this same Raspberry, which provides the
data from the Hall-Sensor on request, such that some CSS-Gui, running on
another pc, can access the sensor-data via Channel Access.

I have a running EPICS base on the Raspberry, and i know how to readout
the sensor in a small c++ program (using the wiringPiSPI library).

What is the best way now, to get the sensor-data into the EPICS IOC ?

My first idea is, to modify the c++-program such, that it prints the
return-value as a formatted text string.
Then there might be an EPICS record-type, which can call this programm
(via SHELL-command), capture the text output, evaluate the outputstring,
and copy this into the record data field.

However, that does not sound like an elegant solution. So what is the
suggested solution, and does anyone maybe have an example of a similar
implementation ?

I have a basic EPICS knowledge, i know what a record is, and i can
configure a database with different records.
But i have no idea how to program eg a new record type by using some
EPICS libraries.

Can anyone help ?????
Or give me a hint where i can find appropriate documentation ?

Best regards,
Christian

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System