Many edits to record reference docs
Add documentation for aSub from wiki. Fix incorrect document structures. Remove inclusion of menu.dbd files. Fix links to common doc's, remove some links to nowhere. Adjust podToHtml.pl and the rule that calls it.
This commit is contained in:
Andrew Johnson
@@ -4,37 +4,53 @@
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# Copyright (c) 2002 The Regents of the University of California, as
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# Operator of Los Alamos National Laboratory.
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# EPICS BASE is distributed subject to a Software License Agreement found
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# in file LICENSE that is included with this distribution.
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# in file LICENSE that is included with this distribution.
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#*************************************************************************
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=title Array Subroutine Record (aSub)
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...
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The aSub record is an advanced variant of the 'sub' (subroutine) record which
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has a number of additional features:
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=over
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=item *
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It provides 20 different input and output fields which can hold array or
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scalar values.
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The types and array capacities of these are user configurable, and they all
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have an associated input or output link.
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=item *
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The name of the C or C++ subroutine to be called when the record processes
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can be changed dynamically while the IOC is running.
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The name can either be fetched from another record using an input link, or
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written directly into the SNAM field.
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=item *
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The user can choose whether monitor events should be posted for the output
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fields.
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=item *
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The VAL field is set to the return value from the user subroutine, which is
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treated as a status value and controls whether the output links will be used
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or not. The record can also raise an alarm with a chosen severity if the status
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value is non-zero.
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=back
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=head2 Record-specific Menus
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=head3 Menu aSubLFLG
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The LFLG field uses this menu to ...
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The LFLG menu field controls whether the SUBL link will be read to update
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the name of the subroutine to be called when the record processes.
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=menu aSubLFLG
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=head3 Menu aSubEFLG
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The EFLG field uses this menu to ...
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=menu aSubEFLG
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...
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=head2 Parameter Fields
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The record-specific fields are described below.
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=recordtype aSub
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...
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=cut
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menu(aSubLFLG) {
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@@ -42,14 +58,69 @@ menu(aSubLFLG) {
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choice(aSubLFLG_READ,"READ")
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}
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=head3 Menu aSubEFLG
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The EFLG menu field indicates whether monitor events should be posted for the
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VALA..VALU output value fields.
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=menu aSubEFLG
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=cut
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menu(aSubEFLG) {
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choice(aSubEFLG_NEVER,"NEVER")
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choice(aSubEFLG_ON_CHANGE,"ON CHANGE")
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choice(aSubEFLG_ALWAYS,"ALWAYS")
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}
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=head2 Parameter Fields
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The record-specific fields are described below.
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=recordtype aSub
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=cut
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recordtype(aSub) {
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include "dbCommon.dbd"
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=head3 Subroutine Fields
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The VAL field is set to the value returned by the user subroutine.
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The value is treated as an error status value where zero mean success.
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The output links OUTA ... OUTU will only be used to forward the associated
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output value fields when the subroutine has returned a zero status.
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If the return status was non-zero, the record will be put into C<SOFT_ALARM>
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state with severity given by the BRSV field.
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The INAM field may be used to name a subroutine that will be called once at
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IOC initialization time.
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LFLG tells the record whether to read or ignore the SUBL link.
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If the value is C<READ>, then the name of the subroutine to be called at
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process time is read from SUBL.
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If the value is C<IGNORE>, the name of the subroutine is that currently held
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in SNAM.
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A string is read from the SUBL link to fetch the name of the subroutine to
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be run during record processing.
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SNAM holds the name of the subroutine to be called when the record processes.
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The value in this field can be overwritten by the SUBL link if LFLG is set
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to C<READ>.
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The SADR field is only accessible from C code; it points to the subroutine
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to be called.
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The CADR field may be set by the user subroutine to point to another function
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that will be called immediately before setting the SADR field to some other
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routine. This allows the main user subroutine to allocate resources when it is
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first called and be able to release them again when they are no longer needed.
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=fields VAL, OVAL, INAM, LFLG, SUBL, SNAM, ONAM, SADR, CADR, BRSV
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=cut
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field(VAL,DBF_LONG) {
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prompt("Subr. return value")
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asl(ASL0)
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@@ -112,12 +183,34 @@ recordtype(aSub) {
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interest(1)
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menu(menuAlarmSevr)
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}
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=head3 Operator Display Parameters
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The PREC field specifies the number of decimal places with which to display
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the values of the value fields A ... U and VALA ... VALU.
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Except when it doesn't.
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=cut
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field(PREC,DBF_SHORT) {
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prompt("Display Precision")
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promptgroup("80 - Display")
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interest(1)
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prop(YES)
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}
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=head3 Output Event Flag
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This field tells the record when to post change events on the output fields
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VALA ... VALU. If the value is C<NEVER>, events are never posted. If the value
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is C<ALWAYS>, events are posted every time the record processes. If the value
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is C<ON CHANGE>, events are posted when any element of an array changes value.
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This flag controls value, log (archive) and alarm change events.
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=fields EFLG
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=cut
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field(EFLG,DBF_MENU) {
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prompt("Output Event Flag")
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promptgroup("50 - Output")
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@@ -125,6 +218,16 @@ recordtype(aSub) {
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menu(aSubEFLG)
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initial("1")
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}
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=head3 Input Link Fields
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The input links from where the values of A,...,U are fetched
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during record processing.
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=fields INPA, INPB, INPC, INPD, INPE, INPF, INPG, INPH, INPI, INPJ, INPK, INPL, INPM, INPN, INPO, INPP, INPQ, INPR, INPS, INPT, INPU
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=cut
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field(INPA,DBF_INLINK) {
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prompt("Input Link A")
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promptgroup("41 - Input A-G")
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@@ -231,9 +334,10 @@ recordtype(aSub) {
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interest(1)
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}
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=head3 Input Fields
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=head3 Input Value Fields
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...
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Thse fields hold the scalar or array values fetched through the input links
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INPA,...,INPU.
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=fields A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U
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@@ -449,6 +553,16 @@ recordtype(aSub) {
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#=write Yes
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#=type Set by FTU
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}
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=head3 Input Value Data Types
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Field types of the input value fields.
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The choices can be found by following the link to the menuFtype definition.
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=fields FTA, FTB, FTC, FTD, FTE, FTF, FTG, FTH, FTI, FTJ, FTK, FTL, FTM, FTN, FTO, FTP, FTQ, FTR, FTS, FTT, FTU
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=cut
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field(FTA,DBF_MENU) {
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prompt("Type of A")
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promptgroup("41 - Input A-G")
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@@ -617,6 +731,15 @@ recordtype(aSub) {
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initial("DOUBLE")
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menu(menuFtype)
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}
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=head3 Input Value Array Capacity
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These fields specify how many array elements the input value fields may hold.
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=fields NOA, NOB, NOC, NOD, NOE, NOF, NOG, NOH, NOI, NOJ, NOK, NOL, NOM, NON, NOO, NOP, NOQ, NOR, NOS, NOT, NOU
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=cut
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field(NOA,DBF_ULONG) {
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prompt("Max. elements in A")
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promptgroup("41 - Input A-G")
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@@ -764,6 +887,16 @@ recordtype(aSub) {
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interest(1)
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initial("1")
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}
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=head3 Input Value Array Size
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These fields specify how many array elements the input value fields currently
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contain.
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=fields NEA, NEB, NEC, NED, NEE, NEF, NEG, NEH, NEI, NEJ, NEK, NEL, NEM, NEN, NEO, NEP, NEQ, NER, NES, NET, NEU
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=cut
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field(NEA,DBF_ULONG) {
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prompt("Num. elements in A")
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special(SPC_NOMOD)
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@@ -890,6 +1023,15 @@ recordtype(aSub) {
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interest(3)
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initial("1")
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}
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=head3 Output Link Fields
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The output links through which the VALA ... VALU field values are sent
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during record processing, provided the subroutine returned 0.
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=fields OUTA, OUTB, OUTC, OUTD, OUTE, OUTF, OUTG, OUTH, OUTI, OUTJ, OUTK, OUTL, OUTM, OUTN, OUTO, OUTP, OUTQ, OUTR, OUTS, OUTT, OUTU
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=cut
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field(OUTA,DBF_OUTLINK) {
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prompt("Output Link A")
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promptgroup("51 - Output A-G")
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@@ -996,9 +1138,10 @@ recordtype(aSub) {
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interest(1)
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}
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=head3 Value Fields
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=head3 Output Value Fields
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...
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These fields hold scalar or array data generated by the subroutine which will
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be sent through the OUTA ... OUTU links during record processing.
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=fields VALA, VALB, VALC, VALD, VALE, VALF, VALG, VALH, VALI, VALJ, VALK, VALL, VALM, VALN, VALO, VALP, VALQ, VALR, VALS, VALT, VALU
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@@ -1214,6 +1357,16 @@ recordtype(aSub) {
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#=write Yes
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#=type Set by FTVU
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}
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=head3 Old Value Fields
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The previous values of the output fields.
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These are used to determine when to post events if EFLG is set to C<ON CHANGE>.
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=fields VALA, VALB, VALC, VALD, VALE, VALF, VALG, VALH, VALI, VALJ, VALK, VALL, VALM, VALN, VALO, VALP, VALQ, VALR, VALS, VALT, VALU
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=cut
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field(OVLA,DBF_NOACCESS) {
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prompt("Old Output A")
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asl(ASL0)
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@@ -1361,6 +1514,16 @@ recordtype(aSub) {
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interest(4)
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extra("void *ovlu")
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}
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=head3 Output Value Data Types
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Field types of the output value fields.
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The choices can be found by following a link to the menuFtype definition.
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=fields FTVA, FTVB, FTVC, FTVD, FTVE, FTVF, FTVG, FTVH, FTVI, FTVJ, FTVK, FTVL, FTVM, FTVN, FTVO, FTVP, FTVQ, FTVR, FTVS, FTVT, FTVU
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=cut
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field(FTVA,DBF_MENU) {
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prompt("Type of VALA")
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promptgroup("51 - Output A-G")
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@@ -1529,6 +1692,15 @@ recordtype(aSub) {
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initial("DOUBLE")
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menu(menuFtype)
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}
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=head3 Output Value Array Capacity
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These fields specify how many array elements the output value fields may hold.
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=fields NOVA, NOVB, NOVC, NOVD, NOVE, NOVF, NOVG, NOVH, NOVI, NOVJ, NOVK, NOVL, NOVM, NOVN, NOVO, NOVP, NOVQ, NOVR, NOVS, NOVT, NOVU
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=cut
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field(NOVA,DBF_ULONG) {
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prompt("Max. elements in VALA")
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promptgroup("51 - Output A-G")
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@@ -1676,6 +1848,16 @@ recordtype(aSub) {
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interest(1)
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initial("1")
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}
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=head3 Output Value Array Size
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These fields specify how many array elements the output value fields currently
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contain.
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=fields NEVA, NEVB, NEVC, NEVD, NEVE, NEVF, NEVG, NEVH, NEVI, NEVJ, NEVK, NEVL, NEVM, NEVN, NEVO, NEVP, NEVQ, NEVR, NEVS, NEVT, NEVU
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=cut
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field(NEVA,DBF_ULONG) {
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prompt("Num. elements in VALA")
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special(SPC_NOMOD)
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@@ -1802,6 +1984,16 @@ recordtype(aSub) {
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interest(3)
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initial("1")
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}
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=head3 Old Value Array Size
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These fields specify how many array elements the old value fields currently
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contain.
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=fields ONVA, ONVB, ONVC, ONVD, ONVE, ONVF, ONVG, ONVH, ONVI, ONVJ, ONVK, ONVL, ONVM, ONVN, ONVO, ONVP, ONVQ, ONVR, ONVS, ONVT, ONVU
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=cut
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field(ONVA,DBF_ULONG) {
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prompt("Num. elements in OVLA")
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special(SPC_NOMOD)
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@@ -1928,4 +2120,305 @@ recordtype(aSub) {
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interest(4)
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initial("1")
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}
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=begin html
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<br>
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<hr>
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<br>
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=end html
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=head2 Record Support Routines
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=head3 init_record
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long (*init_record)(struct dbCommon *precord, int pass)
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This routine is called twice at iocInit. On the first call it does the
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following:
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=over
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=item *
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Calloc sufficient space to hold the number of input scalars and/or arrays
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defined by the settings of the fields FTA-FTU and NOA-NOU. Initialize fields
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NE* to the values of the associated NO* field values.
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=item *
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Calloc sufficient space to hold the number of output scalars and/or arrays
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defined by the settings of the fields FTVA-FTVU and NOVA-NOVU. For the output
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fields, also calloc space to hold the previous value of a field. This is
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required when the decision is made on whether or not to post events.
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=back
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On the second call, it does the following:
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=over
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=item *
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Initializes SUBL if it is a constant link.
|
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=item *
|
||||
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||||
Initializes each constant input link.
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||||
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=item *
|
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|
||||
If the field INAM is set, look-up the address of the routine and call it.
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=item *
|
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|
||||
If the field LFLG is set to IGNORE and SNAM is defined, look up the address of
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the process routine.
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=back
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=head3 process
|
||||
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long (*process)(struct dbCommon *precord)
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This routine implements the following algorithm:
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||||
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||||
=over
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||||
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||||
=item *
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||||
|
||||
If PACT is FALSE, perform normal processing
|
||||
|
||||
=item *
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||||
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||||
If PACT is TRUE, perform asynchronous-completion processing
|
||||
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||||
=back
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||||
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||||
Normal processing:
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||||
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||||
=over
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||||
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||||
=item *
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||||
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Set PACT to TRUE.
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||||
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||||
=item *
|
||||
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||||
If the field LFLG is set to READ, get the subroutine name from the SUBL link.
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||||
If the name is not NULL and it is not the same as the previous subroutine name,
|
||||
look up the subroutine address. Set the old subroutine name, ONAM, equal to the
|
||||
current name, SNAM.
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||||
|
||||
=item *
|
||||
|
||||
Fetch the values from the input links.
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||||
|
||||
=item *
|
||||
|
||||
Set PACT to FALSE
|
||||
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||||
=item *
|
||||
|
||||
If all input-link fetches succeeded, call the routine specified by SNAM.
|
||||
|
||||
=item *
|
||||
|
||||
Set VAL equal to the return value from the routine specified by SNAM.
|
||||
|
||||
=item *
|
||||
|
||||
If the SNAM routine set PACT to TRUE, then return. In this case, we presume
|
||||
the routine has arranged that process will be called at some later time for
|
||||
asynchronous completion.
|
||||
|
||||
=item *
|
||||
|
||||
Set PACT to TRUE.
|
||||
|
||||
=item *
|
||||
|
||||
If VAL is zero, write the output values using the output links.
|
||||
|
||||
=item *
|
||||
|
||||
Get the time of processing and put it into the timestamp field.
|
||||
|
||||
=item *
|
||||
|
||||
If VAL has changed, post a change-of value and log event for this field.
|
||||
If EFLG is set to ALWAYS, post change-of-value and log events for every output
|
||||
field. If EFLG is set to ON CHANGE, post change-of-value and log events for
|
||||
every output field which has changed. In the case of an array, an event will be
|
||||
posted if any single element of the array has changed. If EFLG is set to NEVER,
|
||||
no change-of-value or log events are posted for the output fields.
|
||||
|
||||
=item *
|
||||
|
||||
Process the record on the end of the forward link, if one exists.
|
||||
|
||||
=item *
|
||||
|
||||
Set PACT to FALSE.
|
||||
|
||||
=back
|
||||
|
||||
Asynchronous-completion processing:
|
||||
|
||||
=over
|
||||
|
||||
=item *
|
||||
|
||||
Call the routine specified by SNAM (again).
|
||||
|
||||
=item *
|
||||
|
||||
Set VAL equal to the return value from the routine specified by SNAM.
|
||||
|
||||
=item *
|
||||
|
||||
Set PACT to TRUE.
|
||||
|
||||
=item *
|
||||
|
||||
If VAL is zero, write the output values using the output links.
|
||||
|
||||
=item *
|
||||
|
||||
Get the time of processing and put it into the timestamp field.
|
||||
|
||||
=item *
|
||||
|
||||
If VAL has changed, post a change-of value and log event for this field. If
|
||||
EFLG is set to ALWAYS, post change-of-value and log events for every output
|
||||
field. If EFLG is set to ON CHANGE, post change-of-value and log events for
|
||||
every output field which has changed. In the case of an array, an event will
|
||||
be posted if any single element of the array has changed. If EFLG is set to
|
||||
NEVER, no change-of-value or log events are posted for the output fields.
|
||||
|
||||
=item *
|
||||
|
||||
Process the record on the end of the forward link, if one exists.
|
||||
|
||||
=item *
|
||||
|
||||
Set PACT to FALSE.
|
||||
|
||||
=back
|
||||
|
||||
|
||||
=begin html
|
||||
|
||||
<br>
|
||||
<hr>
|
||||
<br>
|
||||
|
||||
=end html
|
||||
|
||||
=head2 Use of the aSub Record
|
||||
|
||||
The aSub record has input-value fields (A-U) and output-value fields
|
||||
(VALA-VALU), which are completely independent. The input-value fields have
|
||||
associated input links (INPA-INPU), and the output-value fields have associated
|
||||
output links (OUTA-OUTU). Both inputs and outputs have type fields (FTA-FTU,
|
||||
FTVA-FTVU, which default to 'DOUBLE') and number-of-element fields (NOA-NOU,
|
||||
NOVA-NOVU, which default to '1'). The output links OUTA-OUTU will only be
|
||||
processed if the subroutine returns a zero (OK) status value.
|
||||
|
||||
=head3 Example database fragment
|
||||
|
||||
To use the A field to read an array from some other record, then, you would
|
||||
need a database fragment that might look something like this:
|
||||
|
||||
record(aSub,"my_asub_record") {
|
||||
field(SNAM,"my_asub_routine")
|
||||
...
|
||||
field(FTA, "LONG")
|
||||
field(NOA, "100")
|
||||
field(INPA, "myWaveform_1 NPP NMS")
|
||||
...
|
||||
}
|
||||
|
||||
If you wanted some other record to be able to write to the A field, then you
|
||||
would delete the input link above. If you wanted the A field to hold a scalar
|
||||
value, you would either delete the NOA specification, or specify it as "1".
|
||||
|
||||
=head3 Example subroutine fragment
|
||||
|
||||
The associated subroutine code that uses the A field might look like this:
|
||||
|
||||
static long my_asub_routine(aSubRecord *prec) {
|
||||
long i, *a;
|
||||
double sum=0;
|
||||
...
|
||||
a = (long *)prec->a;
|
||||
for (i=0; i<prec->noa; i++) {
|
||||
sum += a[i];
|
||||
}
|
||||
...
|
||||
return 0; /* process output links */
|
||||
}
|
||||
|
||||
Note that the subroutine code must always handle the value fields (A-U,
|
||||
VALA-VALU) as arrays, even if they contain only a single element.
|
||||
|
||||
=head3 Required export code
|
||||
|
||||
Aside from your own code, you must export and register your subroutines so the
|
||||
record can locate them. The simplest way is as follows:
|
||||
|
||||
#include <registryFunction.h>
|
||||
#include <epicsExport.h>
|
||||
|
||||
static long my_asub_routine(aSubRecord *prec) {
|
||||
...
|
||||
}
|
||||
epicsRegisterFunction(my_asub_routine);
|
||||
|
||||
=head3 Required database-definition code
|
||||
|
||||
The .dbd file loaded by the ioc must then contain the following line, which
|
||||
tells the linker to include your object file in the IOC binary:
|
||||
|
||||
function(my_asub_routine)
|
||||
|
||||
=head3 Device support, writing to hardware
|
||||
|
||||
The aSub record does not call any device support routines. If you want to write
|
||||
to hardware, you might use your output fields and links to write to some other
|
||||
record that can write to hardware.
|
||||
|
||||
=head3 Dynamically Changing the User Routine called during Record Processing
|
||||
|
||||
The aSub record allows the user to dynamically change which routine is called
|
||||
when the record processes. This can be done in two ways:
|
||||
|
||||
=over
|
||||
|
||||
=item *
|
||||
|
||||
The LFLG field can be set to READ so that the name of the routine is read from
|
||||
the SUBL link. Thus, whatever is feeding this link can change the name of the
|
||||
routine before the aSub record is processed. In this case, the record looks in
|
||||
the symbol table for the symbol name whenever the name of routine fetched from
|
||||
the link changes.
|
||||
|
||||
=item *
|
||||
|
||||
The LFLG field can be set to IGNORE. In this case, the routine called during
|
||||
record processing is that specified in the SNAM field. Under these conditions,
|
||||
the SNAM field can be changed by a Channel Access write to that field. During
|
||||
development when trying several versions of the routine, it is not necessary
|
||||
to reboot the IOC and reload the database. A new routine can be loaded with
|
||||
the vxWorks ld command, and Channel Access or the dbpf command used to put the
|
||||
name of the routine into the record's SNAM field. The record will look up the
|
||||
symbol name in the symbol table whenever the SNAM field gets modified. The
|
||||
same routine name can even be used as the vxWorks symbol lookup returns the
|
||||
latest version of the code to have been loaded.
|
||||
|
||||
=back
|
||||
|
||||
=cut
|
||||
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user