Experimental Physics and
Industrial Control System

________________________________________________________________________

Mauro Giacchini

Controls System Specialist
Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali di Legnaro
V.le dell'Universita', 2
35020 LEGNARO (PD) - ITALY
Phone: +39.049.8068558


EPICS _at_ LNL http://www.lnl.infn.it/~epics/

...the first EPICS installation to the project SPES realized from the
scratch in ITALY is in production since begin 2010!!
________________________________________________________________________

Hi,

I'm trying to use EPICs with a digitizer (www.redpitaya.com) which has a web interface - I can get the information using curl to download the website information:

curl http://10.95.101.75/bazaar?start=spectrum

curl http://10.95.101.75/data

but I'm a little confused about how to integrate these commands in an ioc. I've set up a StreamDevice template, and I thought I might be able to just send the curl commands by putting them in a record:

record(bo, "$(P)$(R)Start")

{

    field(DESC, "Start App")

    field(DTYP, "stream")

    field(OUT, "@devREDPITAYASTREAM.proto startApp $(PORT) $(A)")

    field(ZNAM, "spectrum")

    #field(PINI, "YES")

    #field(VAL, "1")

}

record(waveform, "$(P)$(R)Data")

{

    field(DESC, "Data string")

    field(DTYP, "stream")

    field(INP,  "@devREDPITAYASTREAM.proto getData(20000) $(PORT) $(A)")

    field(PINI, "YES")

    field(FTVL, "CHAR")

    field(NELM, "32000")

}

with the corresponding entries in the .proto file being:

startApp {

    out "curl http://10.95.101.75/bazaar?start=%{spectrum}";

}

getData {

    out "curl http://10.95.101.75/data";

    in "%\$1[^\r\n]";

    ExtraInput = Ignore;

}

When I run st.cmd, the host is configured to be the IP address of the red pitaya itself, using the HTTP port of 80:

drvAsynIPPortConfigure("L0","10.95.101.75:80",0,0,0)

I'm not sure if this is the right thing to do? In any case, when running st.cmd with asynTraceMask enabled I get a continuous stream of "reads"

2015/02/09 11:48:23.530 10.95.101.75:80 read.

but it doesn't seem to respond to the commands I've made.

Does anyone have any feeling for using Epics with HTTP commands? 

Thanks!

Ana Malagon

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