Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True)

["Marco A. Barra Montevechi Filho via Tech-talk" <tech-talk at aps.anl.gov>]

Good evening all.

Im working with the same IOC i was using here: https://epics.anl.gov/tech-talk/2023/msg00020.php. Now i loaded some motor records in it and am trying to control the IOC via pyepics. Something weird is happening.

i made the following python script:

import epics

a = epics.Motor("MGN:B:E873A:DIAG:X:m1")

a.put("CNEN", 1,wait=True)

assert a.get("CNEN")==1

And i frequently get assertion errors. What is happening? Shouldn't wait=True prevent this? How do i debug this?
Even more weird: i tried debugging this with callbacks:

import epics, time

a = epics.Motor(

        "MGN:B:E873A:DIAG:X:m1")

def printvalue(**kwargs):

    print(kwargs["value"])

b = epics.PV("MGN:B:E873A:DIAG:X:m1.CNEN")

b.add_callback(printvalue)

c = 1

while True:

    c=1-c

    print("#####")

    a.put("CNEN",c)

    time.sleep(0.1)

And i get prints like:

#####

1

#####

0

#####

1

0

#####

Why do i sometimes get two callbacks and sometimes get only one? Thanks in advance for any help.

I append the IOC initialization log and the substitutions file it loads:

INIT LOG:

#!/usr/local/epics/apps/pigcs2IOC/bin/linux-x86_64/pigcs2

< /usr/local/epics/apps/pigcs2IOC/iocBoot/iocPIGCS2/envPaths

epicsEnvSet("IOC","iocPIGCS2")

epicsEnvSet("TOP","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/modules/motorPIGCS2-R1-1/iocs/pigcs2IOC")

epicsEnvSet("SUPPORT","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support")

epicsEnvSet("ASYN","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/asyn-R4-36")

epicsEnvSet("STREAM","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/StreamDevice-2-8-9")

epicsEnvSet("CALC","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/calc-R3-7-3")

epicsEnvSet("RECCASTER","/usr/local/epics-nfs/apps/recsync/1.4_epics_3.15/client")

epicsEnvSet("SNCSEQ","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/seq-2-2-6")

epicsEnvSet("BUSY","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/busy-R1-7-2")

epicsEnvSet("IPAC","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/ipac-2-15")

epicsEnvSet("MOTOR","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1")

epicsEnvSet("EPICS_BASE","/usr/local/epics-nfs/base/R3.15.6")

cd "/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/modules/motorPIGCS2-R1-1/iocs/pigcs2IOC"

## Set up environment

epicsEnvSet("DEV","MGN:B:E873A:DIAG:X:")

epicsEnvSet("BL", "MGN:B:E873A:DIAG:X")

epicsEnvSet("IOCNAME", "MGN-B-E873A-DIAG-X")

epicsEnvSet("EPICS_CA_MAX_ARRAY_BYTES",15728645)

# protocol file paths

epicsEnvSet ("STREAM_PROTOCOL_PATH", ".:/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/db")

## Register all support components

dbLoadDatabase "dbd/pigcs2.dbd"

pigcs2_registerRecordDeviceDriver pdbbase

cd "/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/modules/motorPIGCS2-R1-1/iocs/pigcs2IOC/iocBoot/iocPIGCS2"

## motorUtil (allstop & alldone)

dbLoadRecords("/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/db/motorUtil.db", "P=MGN:B:E873A:DIAG:X:")

##

# < PI_GCS2.cmd

# PI GCS2 support

dbLoadTemplate("/usr/local/epics/apps/config/PIGCS2/e873aX.substitutions")

drvAsynIPPortConfigure("E873_ETH","CDE5B3D.abtlus.org.br:50000",0,0,0)

# Turn on asyn trace

# asynSetTraceMask("E873_ETH",0,3)

# asynSetTraceIOMask("E873_ETH",0,1)

# PI_GCS2_CreateController(portName, asynPort, numAxes, priority, stackSize, movingPollingRate, idlePollingRate)

# # this is the final setup

# PI_GCS2_CreateController("E873", "E873_ETH", 1, 0, 0, 100, 1000)

# speedup debug

PI_GCS2_CreateController("E873", "E873_ETH", 1, 0, 0, 50, 1000)

2023/01/16 18:23:03.949 read from E873_ETH: (c)2016-2020 Physik Instrumente (PI) GmbH & Co. KG, E-873.1AT, 120040762, 03.033

PIasynAxis::PIasynAxis() 0: 1

----------------- axis num: 0 createCLParams() m_szAxisName: 1-------------------

# Turn off asyn trace

# asynSetTraceMask("E873_ETH",0,1)

# asynSetTraceIOMask("E873_ETH",0,0)

# Set end-of-string terminators (port, addr, terminator)

asynOctetSetInputEos("E873_ETH", 0, "\n")

asynOctetSetOutputEos("E873_ETH", 0, "\n")

dbLoadRecords("/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/modules/motorPIGCS2-R1-1/iocs/pigcs2IOC/db/PI_Support.db","P=MGN:B:E873A:DIAG:X:,R=m1:,PORT=E873,ADDR=0,TIMEOUT=1")

# asyn record for troubleshooting

dbLoadRecords("/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/asyn-R4-36/db/asynRecord.db","P=MGN:B:E873A:DIAG:X:,R=asynEth,PORT=E873_ETH,ADDR=0,OMAX=256,IMAX=524288")

# RECSYNC

dbLoadRecords("/usr/local/epics-nfs/apps/recsync/1.4_epics_3.15/client/db/reccaster.db", "P=MGN:B:E873A:DIAG:X:REC:")

# protocol

#dbLoadRecords("$(MOTOR)/db/e873.db", "P=$(DEV),PORT=E873_ETH")

iocInit

Starting iocInit

############################################################################

## EPICS R3.15.6

## EPICS Base built Sep 27 2021

############################################################################


e873aX.substitutions FILE:

file "$(MOTOR)/motorApp/Db/asyn_motor.db"

{

pattern

{P,              M,     DTYP,       PORT, ADDR,      DESC,  EGU,  DIR,  VELO,  VBAS,  ACCL,  BDST,  BVEL,  BACC,  MRES,  PREC,  DHLM,  DLLM,  INIT}

{MGN:B:E873A:DIAG:X:,  "m1",  "asynMotor",  "E873",    0,  "Motor 1", mm,  Pos,    1,    0,    .1,    0,      0,    0,   0.000001,  7,     5.0,   -5.0,  ""}

}

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