Sep 19 – 23, 2022
Europe/Ljubljana timezone
EPICS collaboration meeting is a hybrid event; an in-person and a virtual event

Autoparam, a generic asyn port driver with dynamic parameters

Sep 22, 2022, 10:25 AM
Kolokvij lecture room (J. Stefan Institute)

Kolokvij lecture room

J. Stefan Institute

J. Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
Talk IOC Developments Thursday morning session


Jure Varlec (Cosylab)


Implementing EPICS device support for a specific device can be tricky; implementing generic device support that can integrate different kinds of devices sharing a common interface is trickier still. Yet such a driver can save a lot of time down the road. A well-known example is the Modbus EPICS module: the same support module can be used to integrate any device that speaks the Modbus protocol. It is up to the EPICS database to map device registers to EPICS records. Because no changes to the driver code are needed to integrate a device, a lot of effort is saved. At Cosylab, we often encounter device controllers that speak bespoke protocols. To facilitate development of generic drivers, we wrote the Autoparam EPICS module. It is a base class derived from asynPortDriver that handles low-level details that are common to all generic drivers: it creates handles for device data based on information provided in EPICS records and provides facilities for handling hardware interrupts. Moreover, it strives to provide a more ergonomic API for handling device functions than vanilla asynPortDriver.

Primary author

Jure Varlec (Cosylab)

Presentation materials