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<== Date ==> <== Thread ==>

Subject: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True)
From: "Marco A. Barra Montevechi Filho via Tech-talk" <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Cc: SWC <swc at lnls.br>
Date: Mon, 16 Jan 2023 21:26:56 +0000
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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Replies:
Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Torsten Bögershausen via Tech-talk
Re: Weird behaviour in wait=True when using epics.Motor.get(something, something, wait=True) Matt Newville via Tech-talk

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