Experimental Physics and
Industrial Control System

Your response is greatly appreciated and has been very helpful. Thank you.

However, I still want to know how to simulate interrupt reads through software in the official int32Driver example.

Hello,

I’m not familliar with your driver example (and not so much with asyn), but for the mechanism of the i/o intr to work, some functions have to be declared in the driver himself.

I have a device support example here (without asyn):

https://gitlab.com/formation-epics/anf-2022/4_1-device-support/-/blob/main/top_correction/exerciceDevSupApp/src/MyDeviceExampleIOIntr.c

 

My example is really pointless in real situation because the iocIntr is triggered  by an iocShell function for the example:

https://gitlab.com/formation-epics/anf-2022/4_1-device-support/-/blob/main/top_correction/exerciceDevSupApp/src/commandIocShell.c

 

But in real situation it has to be triggered somehow by the device.

 

 

De : Tech-talk <tech-talk-bounces at aps.anl.gov> De la part de timesir via Tech-talk
Envoyé : vendredi 7 juillet 2023 08:18
À : tech-talk at aps.anl.gov
Objet : interrupt read data in int32Driver example

 

Dear community,

I would like to learn about the usage of epics interrupt. I found an example routine called `int32Driver` (asyn/iocBoot/ioctestEpics/st.cmd and asyn/testEpicsApp/src). In the `st.cmd` script, there is a record instance that I want to use to run an interrupt because it has `SCAN=I/O Intr`. Here is the example record instance:

record(ai,"asyndevAiInt32A0") {
    field(SCAN,"I/O Intr")
    field(DTYP,"asynInt32")
    field(INP,"@asyn( int32 , 0 , 1.0) ")
    field(LINR,"LINEAR")
    field(EGUF,"100.0")
    field(EGUL,"-100.0")
    field(PREC,"3")
}

After running `epics` using the above command, I tried to read the data generated by the interrupt using `caget asyndevAiInt32A0`. However, the return value of `caget` did not change. How can I make `asyndevAiInt32A0` generate a read data interrupt to software simulate a hardware interrupt that produces new data?