Hi Vishnu,
Are the outputs that you are driving just individual outputs of a
parallel output port? If you want to write them at the same time you
can't expect to use a binary output (bo) record for each bit, instead
you should use a multi-bit binary output (mbbo or mbboDirect) which can
write multiple signals at the same time as long as they are on the same
output port.
- Andrew
On 02/17/2014 04:40 AM, Vishnu Patel wrote:
> Hi Mark,
>
> I have used Oscilloscope to measure change of signal level at output
> port terminal in both case
> (1) use linux driver API (linux drive for the IO port board using in the
> system) for changing signal level of output port and measure signal
> level change and finally delay between 2 terminal.
> (Linux driver library is specific to board and same API is called in
> EPICS device support when use EPICS)
> (2) I used EPICS PV to change level of output port and measure signal
> level change on the output port terminal.
>
>
> I think this is answering your question. If still have some question
> please let me know.
>
> Thank you
>
>
>
>
> From: Mark Rivers <[email protected]>
> Sent: Mon, 17 Feb 2014 04:09:39
> To: Vishnu Patel <[email protected]>
> Cc: "techtalk " <[email protected]>
> Subject: Re: record processing time
> You did not answer my questions:
>
> - How have you measured the 50 microseconds between steps 5 and 9?
>
>> With linux driver API there is no delay.
>
> Please be specific. What software are you using with the Linux API and
> how have you measured the delays?
>
> Mark
>
> ________________________________
> From: [email protected] [[email protected]]
> Sent: Sunday, February 16, 2014 4:31 PM
> To: Mark Rivers
> Cc: techtalk
> Subject: Re: record processing time
>
> Dear Mark,
>
> - How have you measured the 50 microseconds between steps 5 and 9?
>
> - What evidence do you have that the delay has anything to do with EPICS
> record processing, and is not just the time required for the Linux
> driver to do the hardware I/O?
>
> With linux driver API there is no delay. That means the delay is cause
> by EPICS record processing. and the delay is almost same between
> consecutive dfanout links (A-B, B-C , C-D ).
>
> Thank you for your explanation.
>
> With Regards
> Vishnu
>
>
>
> From: Mark Rivers <[email protected]>
> Sent: Sat, 15 Feb 2014 00:59:22
> To: "'[email protected]'" <[email protected]>
> Cc: techtalk <[email protected]>
> Subject: Re: record processing time
> Hi Vishnu,
>
> You said:
>
>> The recored TEST:OUT0-O is connected to hardware all output records
> are not synchronous.
>
> That is not true, they are synchronous. That is because when you
> created your driver
>
> pasynManager->registerPort(pDrvPvt->portName,
> ASYN_MULTIDEVICE ,
> 1, /* autoconnect */
> 0, /* medium priority */
> 0); /* default stacksize */
>
> You only set the flag ASYN_MULTIDEVICE, not ASYN_MULTIDEVICE |
> ASYN_CANBLOCK.
>
> Since you did not ASYN_CANBLOCK you have created a synchronous driver,
> not an asynchronous driver.
>
> In a synchronous driver the following steps will all happen in the same
> thread that processes the dfanout record:
>
> 1) Start processing dfanout record
> 2) Process dfanout record OUTA, i.e. process record TEST:OUT0-O
> 3) Call device support for TEST:OUT0-O
> 4) Call driver for TEST:OUT0-O
> 5) Do the I/O to your hardware for TEST:OUT0-O
> 6) Process dfanout record OUTB, i.e. process record TEST:OUT1-O
> 7) Call device support for TEST:OUT1-O
> 8) Call driver for TEST:OUT1-O
> 9) Do the I/O to your hardware for TEST:OUT1-O
> …
>
> I believe that you are saying that the time between steps 5 and 9 above
> is 50 microseconds. This is definitely possible, since this includes
> the time to call the driver and do the actual hardware I/O on your Linux
> system.
>
> Here are my questions.
>
> - How have you measured the 50 microseconds between steps 5 and 9?
>
> - What evidence do you have that the delay has anything to do with EPICS
> record processing, and is not just the time required for the Linux
> driver to do the hardware I/O?
>
> Mark
>
>
> From: [email protected] [mailto:[email protected]]
> Sent: Friday, February 14, 2014 12:19 PM
> To: Mark Rivers
> Cc: techtalk
> Subject: Re: record processing time
>
> Dear Mark,
>
> Thank you.
>
> pasynManager->registerPort? Are you using asynPortDriver base class?
>
> pasynManager->registerPort(pDrvPvt->portName,
> ASYN_MULTIDEVICE ,
> 1, /* autoconnect */
> 0, /* medium priority */
> 0); /* default stacksize */
>
>
> I am not using asynPortDriver but using asynDriver.
>
>
> What do you mean by that? How have you measured it?
> With using API of linux driver no delay.
>
>
>>>>
> field(OUTA, "TEST:OUT0-O PP")
> field(OUTB, "TEST:OUT1-O PP")
> field(OUTC, "TEST:OUT2-O PP")
>
>
> in the above dfanout record, what would be the time difference between
> processing OUTA, "TEST:OUT0-O PP" and OUTB, "TEST:OUT1-O PP".
>
>
> Thanks & regards
>
>
>
> From: Mark Rivers <[email protected]>
> Sent: Fri, 14 Feb 2014 22:22:53
> To: "'[email protected]'" <[email protected]>
> Cc: "techtalk " <[email protected]>
> Subject: Re: record processing time
>> The recored TEST:OUT0-O is connected to hardware all output records
> are not synchronous.
>
> Are you sure they are not synchronous? What flags did you use in your
> asyn driver when calling pasynManager->registerPort? Are you using
> asynPortDriver base class?
>
>> Hardware also having no delay.
>
> What do you mean by that? How have you measured it?
>
>> is dfanout record execute each link one by one or all simultaneously?
>
> It processes one link at a time. How could it do them simultaneously?
>
> Mark
>
>
>
> From: [email protected] [mailto:[email protected]]
> Sent: Friday, February 14, 2014 10:31 AM
> To: Mark Rivers
> Cc: techtalk
> Subject: Re: record processing time
>
>
> The recored TEST:OUT0-O is connected to hardware all output records are
> not synchronous.
> I am using asynDriver. and all these records have same asyn intereface
> as they are similar.
> Hardware also having no delay.
>
> is dfanout record execute each link one by one or all simultaneously?
>
> Thank you
>
> Vishnu
>
>
>
> From: Mark Rivers <[email protected]>
> Sent: Fri, 14 Feb 2014 20:44:44
> To: "'[email protected]'" <[email protected]>
> Cc: techtalk <[email protected]>
> Subject: Re: record processing time
> Hi Vishnu,
>
> Please tell us about your output records, TEST:OUT0-O, etc. Are they
> connected to hardware? If so, is the device support synchronous or
> asynchronous, and what driver are you using? If they are connected to
> hardware and the device support is synchronous, then 50 microseconds may
> just be the time it takes the driver to do the I/O. If the records are
> not connected to hardware then how did you measure the 50 microseconds?
>
> Mark
>
>
> From: [email protected] [mailto:[email protected]]
> Sent: Friday, February 14, 2014 8:37 AM
> To: Mark Rivers
> Cc: techtalk
> Subject: Re: record processing time
>
> Hi,
> In my application i am putting value on 4 output port lines
> simultaneously with dfanout record.
> record (dfanout,"TEST:EVENT1-FOUT")
> {
> field(DESC, "stop all event simaltanously")
> field(DOL, "TEST:WAIT-EVENT")
> field(HOPR, "1")
> field(LOPR, "0")
> field(OMSL, "closed_loop")
> field(OUTA, "TEST:OUT0-O PP")
> field(OUTB, "TEST:OUT1-O PP")
> field(OUTC, "TEST:OUT2-O PP")
> field(OUTD, "TEST:OUT3-O PP")
> }
>
>
>
> "TEST:OUT0-O, TEST:OUT1-O, TEST:OUT2-O, and TEST:OUT3-O are 4
> output record putting the values on output port lines.
>
> The TEST:WAIT-EVENT is the taking value from User interface. 0 or 1.
>
>
> I observed the delay between each output is approximately 50 micro
> second. so total delay from first to last PV is ~200 micro second.
> The OS running the IOC is RHEL.
>
>
> I would like to know this delay time is normal in EPICS or i can even
> get better with some mechanism.
>
>
> Thank you
>
>
> From: Mark Rivers <[email protected]>
> Sent: Wed, 12 Feb 2014 20:39:16
> To: Vishnu Patel <[email protected]>, "techtalk "
> <[email protected]>
> Subject: Re: record processing time
> The processing time depends of course on the record type and the CPU you
> are using. But it is typically on the order of a few microseconds.
> ________________________________
> From: [email protected] [[email protected]] on
> behalf of Vishnu Patel [[email protected]]
> Sent: Wednesday, February 12, 2014 8:16 AM
> To: techtalk
> Subject: record processing time
>
> Hi,
> I would like to know about time required for record processing.
> In my application
> When PV1 becomes 1 (scan I/O Intr.), process waveform record with FLNK
> and then first element value of waveform record is placed in PVx and
> second element value of waveform record is put in PVy with subArray record.
>
> I would like to know, what is the process time of EPICS record processing?
>
> Thank you
>
> Vishnu
>
>
>
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