Experimental Physics and
Industrial Control System

Hey Jan,

if you are using a Raspi 3, it might be a configuration problem of the Pi itself.

I found several bug reports for "pyserial" (Python lib for serial communication) describing the same problem. The solution here was as follows;

/dev/ttyS0 of Raspberry Pi 3 Model B does not support EVEN and ODD.
So, you need to use /dev/ttyAMA0.
However /dev/ttyAMA0 of Raspberry Pi 3 Model B is bound to Bluetooth module.
In order to use /dev/ttyAMA0, you need to add the followings line into /boot/config.txt.

dtoverlay=pi3-miniuart-bt

After reboot, you can use /dev/ttyAMA0 as physical serial port.

HTH! Florian

​Hey everyone,

I have some trouble running an Raspberry Pi IOC with serial communication in parity-mode "even".

I adapted an online example and got it running without problems as long as the asynsetOption parity in st.cmd is "none"
asynSetOption("SERIALPORT",-1,"parity","none"). I checked the communication with an oszilloscope and it is fine.
As soon as I change the parity to "even" (thats what I read from the ASYN4.38 manual) it fails.

Base is R7.0.3.1
I tried ASYN 4-36 and 4-38
I tried "even" "EVEN" and "Even"

st.cmd and log after ioc-start see below

Do I have to change the parity somewhwer else? Or are other settings colliding?

Thanks in advance, best regards, Jan


st.cmd: (parity "none" is fine, "odd" is also failing)

#################################
#!/home/pi/Apps/epics/helloWorldIOC/bin/linux-arm/helloWorldIOC

#- You may have to change helloWorldIOC to something else
#- everywhere it appears in this file

< envPaths
epicsEnvSet(STREAM_PROTOCOL_PATH,"/home/pi/Apps/epics/helloWorldIOC/helloWorldIOCApp/Db")
cd "${TOP}"

## Register all support components
dbLoadDatabase "/home/pi/Apps/epics/helloWorldIOC/dbd/helloWorldIOC.dbd"
helloWorldIOC_registerRecordDeviceDriver pdbbase
drvAsynSerialPortConfigure("SERIALPORT","/dev/ttyS0",0,0,0)
asynSetOption("SERIALPORT",-1,"baud","19200")
asynSetOption("SERIALPORT",-1,"bits","8")
asynSetOption("SERIALPORT",-1,"parity","even")
asynSetOption("SERIALPORT",-1,"stop","1")
asynSetOption("SERIALPORT",-1,"clocal","Y")
asynSetOption("SERIALPORT",-1,"crtscts","N")
dbLoadRecords("/home/pi/Apps/epics/helloWorldIOC/db/arduino.db","PORT='SERIALPORT'")

## Load record instances
#dbLoadRecords("db/xxx.db","user=pi")

cd "${TOP}/iocBoot/${IOC}"
iocInit

## Start any sequence programs
#seq sncxxx,"user=pi"
###############################

Log after starting the IOC - Failure in Line 14.:

###############################
#!/home/pi/Apps/epics/helloWorldIOC/bin/linux-arm/helloWorldIOC
< envPaths
Can't open envPaths: No such file or directory
epicsEnvSet(STREAM_PROTOCOL_PATH,"/home/pi/Apps/epics/helloWorldIOC/helloWorldIOCApp/Db")
macLib: macro TOP is undefined (expanding string cd "${TOP}")
## Register all support components
dbLoadDatabase "/home/pi/Apps/epics/helloWorldIOC/dbd/helloWorldIOC.dbd"
helloWorldIOC_registerRecordDeviceDriver pdbbase
drvAsynSerialPortConfigure("SERIALPORT","/dev/ttyS0",0,0,0)
asynSetOption("SERIALPORT",-1,"baud","19200")
asynSetOption("SERIALPORT",-1,"bits","8")
asynSetOption("SERIALPORT",-1,"parity","even")
setOption failed tcsetattr failed: Invalid argument
asynSetOption("SERIALPORT",-1,"stop","1")
asynSetOption("SERIALPORT",-1,"clocal","Y")
asynSetOption("SERIALPORT",-1,"crtscts","N")
dbLoadRecords("/home/pi/Apps/epics/helloWorldIOC/db/arduino.db","PORT='SERIALPORT'")
## Load record instances
#dbLoadRecords("db/xxx.db","user=pi")
macLib: macro TOP is undefined (expanding string cd "${TOP}/iocBoot/${IOC}")
macLib: macro IOC is undefined (expanding string cd "${TOP}/iocBoot/${IOC}")
iocInit
Starting iocInit
############################################################################
## EPICS R7.0.3.1
## EPICS Base built May 13 2020
############################################################################
iocRun: All initialization complete
## Start any sequence programs
#seq sncxxx,"user=pi"
epics>
###############################

-- 
Ruhr-Universität Bochum
AG der Experimentalphysik I
Dr. Florian Feldbauer
NB 2/131 / Fach 125
Universitätsstr. 150
D-44801 Bochum

Office: NB 2/134
Phone:  (+49)234 / 32-23563
Fax:    (+49)234 / 32-14170
https://paluma.ruhr-uni-bochum.de

References:

Asyn4-38 SetOption Parity "Even" fails - "Invalid argument" Jan Hoppius via Tech-talk

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