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Subject: Re: [AsynPortDriver] "Multiple interrupt callbacks between processing" warning with multiple arrays
From: Paweł Plewiński <pplewinski@dmcs.pl>
To: Mark Rivers <rivers@cars.uchicago.edu>
Cc: tech-talk@aps.anl.gov
Date: Tue, 11 Apr 2017 20:55:26 +0200
Hi Mark,

thanks for quick answer. Actually I forgot to post the record, but it had SCAN set to I/O INTR, similarly to the example project. Here's the record definition:

record(waveform, "PIEZO:OSC-CH$(CHANNEL)-WAVEFORM")
{
    field(DTYP, "asynFloat64ArrayIn")
    field(INP,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))OSC_WAVEFORM")
    field(FTVL, "DOUBLE")
    field(NELM, "$(NPOINTS)")
    field(LOPR, "0")
    field(HOPR, "10")
    field(SCAN, "I/O Intr")
}

As for the commands you asked for, the results are, respectively:

ACKS: NO_ALARM      ACKT: YES           APST: Always        ASG:
ASP: (nil)          BKPT: 00            BPTR: 0xbcb3e0      BUSY: 0
DESC: DISA: 0 DISP: 0 DISS: NO_ALARM
DISV: 1             DPVT: 0xc05690      DSET: 0x7f2dbdcea9a0
DTYP: asynFloat64ArrayIn                EGU:                EVNT: 0
FLNK:CONSTANT 0     FTVL: DOUBLE        HASH: 0             HOPR: 10
INP:INST_IO @asyn(testAPD,0,1)OSC_WAVEFORM                  LCNT: 0
LOPR: 0             LSET: 0xc07f40
MLIS: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
MLOK: b0 b3 bc 00 00 00 00 00           MPST: Always
NAME: PIEZO:OSC-CH0-WAVEFORM            NELM: 1000          NORD: 1000
NSEV: NO_ALARM      NSTA: NO_ALARM      PACT: 0             PHAS: 0
PINI: NO            PPN: (nil)          PPNR: (nil)         PREC: 0
PRIO: LOW           PROC: 0             PUTF: 0             RARM: 0
RDES: 0xb86470      RPRO: 0             RSET: 0x7f2dbda73340
SCAN: I/O Intr SDIS:CONSTANT SEVR: NO_ALARM SIML:CONSTANT SIMM: NO SIMS: NO_ALARM SIOL:CONSTANT SPVT: 0xc135e0
STAT: NO_ALARM      TIME: 2017-04-11 20:53:12.153366126     TPRO: 0
TSE: 0              TSEL:CONSTANT       UDF: 0              VAL: (nil)


ACKS: NO_ALARM      ACKT: YES           APST: Always        ASG:
ASP: (nil)          BKPT: 00            BPTR: 0xbcd3a0      BUSY: 0
DESC: DISA: 0 DISP: 0 DISS: NO_ALARM
DISV: 1             DPVT: 0xc05be0      DSET: 0x7f2dbdcea9a0
DTYP: asynFloat64ArrayIn                EGU:                EVNT: 0
FLNK:CONSTANT 0     FTVL: DOUBLE        HASH: 0             HOPR: 10
INP:INST_IO @asyn(testAPD,1,1)OSC_WAVEFORM                  LCNT: 0
LOPR: 0             LSET: 0xc07f60
MLIS: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
MLOK: 70 d3 bc 00 00 00 00 00           MPST: Always
NAME: PIEZO:OSC-CH1-WAVEFORM            NELM: 1000          NORD: 1000
NSEV: NO_ALARM      NSTA: NO_ALARM      PACT: 0             PHAS: 0
PINI: NO            PPN: (nil)          PPNR: (nil)         PREC: 0
PRIO: LOW           PROC: 0             PUTF: 0             RARM: 0
RDES: 0xb86470      RPRO: 0             RSET: 0x7f2dbda73340
SCAN: I/O Intr SDIS:CONSTANT SEVR: NO_ALARM SIML:CONSTANT SIMM: NO SIMS: NO_ALARM SIOL:CONSTANT SPVT: 0xc138f0
STAT: NO_ALARM      TIME: 2017-04-11 20:53:29.910249080     TPRO: 0
TSE: 0              TSEL:CONSTANT       UDF: 0              VAL: (nil)


ACKS: NO_ALARM      ACKT: YES           APST: Always        ASG:
ASP: (nil)          BKPT: 00            BPTR: 0xbcf360      BUSY: 0
DESC: DISA: 0 DISP: 0 DISS: NO_ALARM
DISV: 1             DPVT: 0xc060e0      DSET: 0x7f2dbdcea9a0
DTYP: asynFloat64ArrayIn                EGU:                EVNT: 0
FLNK:CONSTANT 0     FTVL: DOUBLE        HASH: 0             HOPR: 10
INP:INST_IO @asyn(testAPD,2,1)OSC_WAVEFORM                  LCNT: 0
LOPR: 0             LSET: 0xc07f80
MLIS: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
MLOK: 30 f3 bc 00 00 00 00 00           MPST: Always
NAME: PIEZO:OSC-CH2-WAVEFORM            NELM: 1000          NORD: 1000
NSEV: NO_ALARM      NSTA: NO_ALARM      PACT: 0             PHAS: 0
PINI: NO            PPN: (nil)          PPNR: (nil)         PREC: 0
PRIO: LOW           PROC: 0             PUTF: 0             RARM: 0
RDES: 0xb86470      RPRO: 0             RSET: 0x7f2dbda73340
SCAN: I/O Intr SDIS:CONSTANT SEVR: NO_ALARM SIML:CONSTANT SIMM: NO SIMS: NO_ALARM SIOL:CONSTANT SPVT: 0xc13c00
STAT: NO_ALARM      TIME: 2017-04-11 20:54:17.907769453     TPRO: 0
TSE: 0              TSEL:CONSTANT       UDF: 0              VAL: (nil)


ACKS: NO_ALARM      ACKT: YES           APST: Always        ASG:
ASP: (nil)          BKPT: 00            BPTR: 0xa7b540      BUSY: 0
DESC: DISA: 0 DISP: 0 DISS: NO_ALARM
DISV: 1             DPVT: 0xab0810      DSET: 0x7efec944b9a0
DTYP: asynFloat64ArrayIn                EGU:                EVNT: 0
FLNK:CONSTANT 0     FTVL: DOUBLE        HASH: 0             HOPR: 10
INP:INST_IO @asyn(testAPD,3,1)OSC_WAVEFORM                  LCNT: 0
LOPR: 0             LSET: 0xab21d0
MLIS: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
MLOK: 10 b5 a7 00 00 00 00 00           MPST: Always
NAME: PIEZO:OSC-CH3-WAVEFORM            NELM: 1000          NORD: 1000
NSEV: NO_ALARM      NSTA: NO_ALARM      PACT: 0             PHAS: 0
PINI: NO            PPN: (nil)          PPNR: (nil)         PREC: 0
PRIO: LOW           PROC: 0             PUTF: 0             RARM: 0
RDES: 0xa30650      RPRO: 0             RSET: 0x7efec91d4340
SCAN: I/O Intr SDIS:CONSTANT SEVR: NO_ALARM SIML:CONSTANT SIMM: NO SIMS: NO_ALARM SIOL:CONSTANT SPVT: 0xabe140
STAT: NO_ALARM      TIME: 2017-04-11 20:52:33.970326348     TPRO: 0
TSE: 0              TSEL:CONSTANT       UDF: 0              VAL: (nil)


Best regards,
Paweł



W dniu 2017-04-11 18:24, Mark Rivers napisał(a):
Hi Pawel,

What is the SCAN field of your waveform record?  I suspect it is
probably periodic ("1 second", etc.).  For this application you should
set it to SCAN="I/O Intr".  Then the waveform record will process each
time your driver does a callback to device support.  If the record is
periodically processing at 1 second and your driver is doing callbacks
faster than 1 Hz then you will see the error you report.

Mark


-----Original Message-----
From: tech-talk-bounces@aps.anl.gov
[mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Pawel Plewinski
Sent: Tuesday, April 11, 2017 8:49 AM
To: tech-talk@aps.anl.gov
Subject: [AsynPortDriver] "Multiple interrupt callbacks between
processing" warning with multiple arrays

Hi,

I've recently written asyn-based device support for a custom device
communicating over PCIe. One of its functions is to periodically
retrieve 4 waveforms from 4 channels, which is done in a separate
thread, from which the callback function is called to notify asyn about
change. I heavily based the code on the AsynPortDriver example.
The driver works, however if the update rate is lower than 1 second,
strange warning appears in the console at the time of every refresh (and
that's only for one of 4 channels), namely:

2017/04/11 15:42:08.682 PIEZO:OSC-CH0-WAVEFORM
devAsynFloat64Array::interruptCallbackInput
\000\000\000\000\000@\205?\000\000\000\000\000\300\202?\000\000\000\000\000\000\204?\000\000\000\000\000\000\204?\000\000\000\000\000\300\202?\000\000\000\000\000\000\204?\000\000\000\000\000@\205?\000\000\000\000\000\000\204?\000\000\000\000\000\300\202?\000\000\000\000\000\000\204?
2017/04/11 15:42:08.682 PIEZO:OSC-CH0-WAVEFORM
devAsynFloat64Array::processCommon, warning, multiple interrupt
callbacks between processing

The parameters passed to the top level constructor are
    : asynPortDriver(portName,
                     4, /* maxAddr */
                     (int)NUM_SCOPE_PARAMS,
                     asynInt32Mask | asynFloat64Mask |
asynFloat64ArrayMask | asynEnumMask | asynDrvUserMask, /* Interface mask
*/
                     asynInt32Mask | asynFloat64Mask |
asynFloat64ArrayMask | asynEnumMask,  /* Interrupt mask */
                     ASYN_MULTIDEVICE, /* asynFlags.  This driver does
not block and it is not multi-device, so flag is 0 */
                     1, /* Autoconnect */
                     0, /* Default priority */
                     0) /* Default stack size*/

The readback thread code:

void piezoPortDriver::readbackTask(void)
{
    while (1) {
            bool stopped = false;

            lock();
            auto new_data = osc->fetch_data(vtim, vdat);
            unlock();

            if (!stopped)
            {
                lock();
                this->osc_update_trigger();
                unlock();
            }
         callParamCallbacks();

         for (int i = 0; i < 4; i++){
           doCallbacksFloat64Array(vdat[i].data(), vdat[i].size(),
P_OscWaveform, i);
         }
         usleep(100000);
     }
}

The fetch_data method reads four 1000-element double vectors from PCIe.

Could you give me some suggestions what may be wrong?

Regards,
Paweł Plewiński
Department of Microelectronics and Computer Science
Lodz University of Technology

Replies:
RE: [AsynPortDriver] "Multiple interrupt callbacks between processing" warning with multiple arrays Mark Rivers
References:
[AsynPortDriver] "Multiple interrupt callbacks between processing" warning with multiple arrays Paweł Plewiński
RE: [AsynPortDriver] "Multiple interrupt callbacks between processing" warning with multiple arrays Mark Rivers

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