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<== Date ==> <== Thread ==>
Subject: Read and Write errors with VME-EVR-300
From: "Hong, Ran via Tech-talk" <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Tue, 4 Oct 2022 00:29:46 +0000
Hello All,

I am testing a VME IOC with 1 VME-EVM-300 and 6 VME-EVR-300 boards. The CPU board is mvme-3100, and the driver is derived from mrfioc2:
I experienced many errors like missing time stamp, incorrect GTX waveform, and so on. They all stem from issues when reading from or writing to VME registries using READ32 or WRITE32 in the driver. For example, in evrMrmApp/src/drvem.cpp line 803 to 806 for latching the timestamp, 
epicsUInt32 ctrl=READ32(base, Control);

// Latch timestamp
WRITE32(base, Control, ctrl|Control_tsltch);

It reads the control registry, modify the bit for timestamp latch, and write it back to the control registry. Occasionally, I saw the READ32 returns 0xffffffff, which is an invalid value for the control registry, and the subsequent WRITE32 results in a mess in the EVR.

Has anyone experienced similar issues? Any suggestions to prevent or mitigate the VME I/O errors?

Thanks!

Ran Hong
Replies:
Re: Read and Write errors with VME-EVR-300 Heinz Junkes via Tech-talk
Re: Read and Write errors with VME-EVR-300 Wang, Lin via Tech-talk
Re: Read and Write errors with VME-EVR-300 Michael Davidsaver via Tech-talk
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