RE: testAsynPortDriver questions

[Mark Rivers <rivers@cars.uchicago.edu>]

> I found in testAsynPortDriver.cpp file, there is a function like this:
> void simTask(void *drvPvt) ,but I can’t find where is called?  what's the usage of this function?

That function is the background thread that runs the simulation.  It is called from the constructor in this call:

    /* Create the thread that computes the waveforms in the background */
    status = (asynStatus)(epicsThreadCreate("testAsynPortDriverTask",
                          epicsThreadPriorityMedium,
                          epicsThreadGetStackSize(epicsThreadStackMedium),
                          (EPICSTHREADFUNC)::simTask,
                          this) == NULL);

> Another question, there is a parameter named as “Vert gain”, seems it’s used to convert volt’s unit to mv, am I right?
> thanks a lot for your help.

It is used to set the gain of the vertical signal, like setting what type of scope probe (1X, 10X, 100X) is used on a real scope.  However, I just noticed that changing this value does not change the display until you then process the VoltsPerDivSelect PV.  You can select the same VoltsPerDivSelect menu choice, then the display will change to reflect the current VertGainSelect.

Mark



________________________________
From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Silver [marco_hair@163.com]
Sent: Monday, May 16, 2016 10:16 PM
To: tech-talk
Subject: testAsynPortDriver questions

hi,

I found in testAsynPortDriver.cpp file, there is a function like this:
void simTask(void *drvPvt) ,but I can’t find where is called?  what's the usage of this function?
Another question, there is a parameter named as “Vert gain”, seems it’s used to convert volt’s unit to mv, am I right?
thanks a lot for your help.




________________________________
Best wishes
Geyang 2016-05-17