Serial Port Debug

This is a temporary page for fault finding with changes from https://github.com/ISISComputingGroup/IBEX/issues/4435

symptoms: com port stuck, no reads work, dbior hangs.

Until this PR is deployed you will first need to update asyn.dll for the IOC concerned

• stop IOC concerned
• copy asyn.dll from Ticket4435 build (asyn_ovio jenkins job) to same directory as .exe for IOC (so it will load in preference to existing asyn.dll)
• start IOC
• when done, remove new asyn.dll from the IOC bin/windows-x64 directory

After restarting with new asyn you should be able to type

dbior drvAsyn 5

without it hanging. The new ASIO may even fix the issue, but should at least give you more output. If the IOC is not fixed, can you try adding:

epicsEnvSet("WAITFORBYTES",1)

to the st.cmd, this will enable another sort of read mode to test.

It would also be worth adding

asynSetOption("L0", -1, "eventmask", "0x11b")	

to startup, this will print all com events except writes – to see writes too use:

asynSetOption("L0", -1, "eventmask", "0x11f")

You can also stop IOC and try using the testSerialPort command