Field DAQ 101¶
This document is intended to provide a rough overview of the software components used in the fiel daq and where to find the corresponding code.
In general, all frontends (fe1, fe2, fe3) and the backend have the daq code in:
~/Gm2FieldOnline/gm2fielddaq. This is the part we mainly modify. This builds on top of midas which we have in@ ~/Packages/gm2midas@. Once that's installed and the environment is set up right (through
.midasrc) we hopefully never need to touch that.
The frontend code is in
~Gm2FieldOnline/gm2fielddaq/frontends. They all use the libraries in
~Gm2FieldOnline/gm2fielddaq/hardware-interfaces which only needs to be rebuilt (and INSTALLED) if we make hardware changes what's much less common. The frontends are built inside the corresponding folder. No
install is required.
Special case: Fixed-Probes¶
The fixed probes are kind of special because they need essentially the offline code including the gm2fieldsignal-library for the online freq extraction that is then used in the feedback. This code is in
Our "midas-server" runs on
The custom code is located in
Gm2FieldOnline/gm2fielddaq/online/custom and the scripts used to start, kill, restart parts including frontends and dqm are in
To look at the ODB and edit just a few single keys the simplest way is the web interface (
mhttpd) -> ODB menu point. To edit larger blocks, restore the ODB, move or copy parts the program
g2field-be can be used.
The art jobs of the dqm run on
g2field-be. The working directory for that is
Gm2FieldOnline/DQMWorkplace. The used art modules are in
Gm2FieldOnline/srcs/gm2field/dqm while the nodes servers for displaying the dqm are in
Gm2FieldOnline/srcs/gm2dqm/node. We run the nodes either on
The dqm fcl-files are located at
~/Gm2FieldOnline/fcl, they are copied from the gm2field repository: