Splitting a string in a protocol file

["Wang, Andrew via Tech-talk" <tech-talk at aps.anl.gov>]

Hi,

 

I’m relatively new to EPICS and I have been tasked with writing drivers for a Keysight oscilloscope. One of the commands that I need to set up is the following:

 

:CHANnel<N>:SCALe

 

This command requires a channel number and a value. So if I wanted to set the vertical scale of Channel 2 to 50 V, I would do

 

:CHANnel2:SCALe 50

 

I would like to work on both my protocol file and database file, but I am not sure how to go about it. This is what I currently have.

 

record(aao, "set_vert_scale")

{

              field(DESC, "Set vertical scale for a channel")

              field(DTYP, "stream")

              field(FTVL, "STRING")

              field(OUT, "@keysightOsc.proto setVertScale $(PORT)")

}

 

setVertScale

{

              separator = “,”

              out "%s:SCALe ";

}

 

My goal is for the user to enter a command such as caput set_vert_scale CHAN1,5 so that the string can be split in a manner such that CHAN1 and 5 can be concatenated to the beginning and end of :SCALe.

 

Any thoughts on how to do so?

 

Thanks,

Andy