Skip to content

F
FMC TDC 1ns 5cha

How to use the epics device support of fmc tdc

Last edited by Erik van der Bij
Page history
This is an old version of this page. You can view the most recent version or browse the history.

Here we introduce how to use the SPEC and FMC-TDC with the EPICS device support.

  1. Edit configure/RELEASE
    # the CONFIG_SITE file.
    # Variables and paths to dependent modules:
    MODULES=/opt/epics/R3-15-8/modules
    DEVWRTDC=$(MODULES)/devWrtdc     <- add
  1. Edit Makefile
    $ vi xxxApp/src/Makefile
    Add PROD_DEPLIB_DIRS and PROD_LIBS
    #----------------------------------------
    # ADD RULES AFTER THIS LINE
    PROD_DEPLIB_DIRS += /home/kekbcont/wr/fmc-tdc-sw/lib     <- Add with your condition
    PROD_LIBS += fmctdc <- Add
  1. Check the PCI ID
    $ lspci | grep CERN
    01:00.0 Non-VGA unclassified device: CERN/ECP/EDU Device 018d (rev 03)
    In this case, ID becomes 0100.
  1. Create EPICS DB file
    There are two types of records.
    The PCI ID is put on the INP field with channel number.
    record(longin, "ET_WR8:TDC:CH0:LI") {
    field(DTYP, "WR TDC STAMP")
    field(SCAN, "I/O Intr")
    field(INP, "@IF=0100,CH=0")
    field(TSE, "-2")
    }
    record(waveform, "ET_WR8:TDC:CH0:WF") {
    field(DTYP, "WR TDC STAMP")
    field(SCAN, "I/O Intr")
    field(INP, "@IF=0100,CH=0")
    field(NELM, "3")
    field(FTVL, "ULONG")
    field(TSE, "-2")
    field(MPST, "Always")
    }
  1. Build IOC with the make command at the TOP directory.
  1. Edit the start-up script
    $ vi iocBoot/iocxxx/st.cmd
    Add wrtdcOpen() before dbLoadRecords()
    dbLoadDatabase "dbd/testWrtdc.dbd"
    testWrtdc_registerRecordDeviceDriver pdbbase
    wrtdcOpen(0100)     <- add
  1. Execute
    $ cd iocBoot/iocxxx
    $ sudo -E ./st.cmd

More information about the device type

  • timestamp
    • device type: "WR TDC STAMP"
    • record type: "longin" or "waveform"

example,
record(longin, "ET_WR8:TDC:CH0:LI") {
field(DTYP, "WR TDC STAMP")
field(SCAN, "I/O Intr")
field(INP, "@IF=0100,CH=0")
field(TSE, "-2")
field(MDEL, "-1")
}
record(waveform, "ET_WR8:TDC:CH0:WF") {
field(DTYP, "WR TDC STAMP")
field(SCAN, "I/O Intr")
field(INP, "@IF=0100,CH=0")
field(NELM, "3")
field(FTVL, "ULONG")
field(TSE, "-2")
field(MPST, "Always")
}
In the case of the "login" type, the timestamp of the input timing is stored in the TIME field with the accuracy of a nano-second. More precise timing in pico-second is stored in the VAL field.

All timestamp information is stored in the array in the case of the "waveform" type. The first element indicates the timing in a second. The precise timing information is stored in the second element with the unit of a nano-second. Then, the further precise timing in the unit of a pico-second is stored in the third element.