Experimental Physics and
Industrial Control System

 Hi Evan,

Probably. It may be expensive in terms of execution time though. And it is limited to the size of your waveform record of course.

My idea is to strip off the addresses first with a regsub and then read the words. You cannot use InTerminator because we need the whole command output in our input „line“. Thus you need to use ReadTimout with the latency penalty involved. (If you have no other channel to signal „finished“ like for example GPIB has with its EOI line.)

Something like this (totally untested):

ReadMem {

    InTerminator=;

    ReadTimeout=100; # whatever works

    out “r %(\$1:start)x 2“; # start taken fron another record, not sure what the 2 is, lines?

    in “%#/\n[0–9A-Fx]+://“  # remove newline and addresses

        “%x“;

)

Use with a waveform or aai with FTVL=LONG and NELM big enough.

Using LONG gives you signed values but avoids conversion to double in CA. NELM limits the number of words you can read. The actual number of words read will be in NORD.

The alternative would be to preprocess input with an asynInterpose layer you would have to write.

Dirk

Am 31.01.2024 um 20:44 schrieb Daykin, Evan via Tech-talk <tech-talk at aps.anl.gov>:



Hi Tech-Talk,

 

I would like to read out the contents of the device memory in a waveform. For example, reading two words from memory, starting at address 0x0:

 

>r 0x0 2

 

0x00000000: 0xEA000049 3925868617

0x00000004: 0xEA000025 3925868581

 

So, the response has one new line, and then any number of “<address>: <value in hex> <value in dec>”. Does StreamDevice support mapping a variable number of lines to a waveform/aai record?

 

Thanks,
Evan