I mean the pulses the coming on Hardware CROscilloscope but not with same
period (6.7 ms)
From: adit bhargava <adit_bh...@yahoo.com>
To: andy pugh <bodge...@gmail.com>; Enhanced Machine Controller (EMC)
<emc-users@lists.sourceforge.net>
Sent: Monday, April 18, 2016 8:34 PM
Subject: Re: [Emc-users] Need to add a faster thread base-thread with 100
microseconds, Compilation changes required !!!
Hello Andy,
Thanks you for suggestions. I am able to add a new faster thread ( 100
microseconds ) now.But, now the problem is I am not getting the output as
desired on hardware although I am getting correct output on HALSCOPE.
RECAP:
I wanted a square pulse of T-On = 2 ms and T-Off = 4.7 ms
I used pwmgen as suggested by you with Freq = 150 Hz and Duty cycle = 29.9%I am
getting the pulses correctly with 6.7 ms period on HALSCOPE but not on hardware
FPGA which is connected to CROscilloscope.
Following are details of my hardware:
MESA 5I25 I/O FPGA Card with two breakout cards MESA 7I76 STEP/IO Step&dir
plus I/O daughtercard and MESA 7I78 Step&dir daughtercard Oscilloscope
connect to 7176 daughtercard Plus: TB6 PIN24 => OUT7 Gnd: TB3
PIN15 => GND PWM Signal Routed to OUT 7
BRAdit
From: andy pugh <bodge...@gmail.com>
To: adit bhargava <adit_bh...@yahoo.com>; Enhanced Machine Controller (EMC)
<emc-users@lists.sourceforge.net>
Sent: Monday, April 18, 2016 5:07 PM
Subject: Re: [Emc-users] Need to add a faster thread base-thread with 100
microseconds, Compilation changes required !!!
On 18 April 2016 at 15:36, adit bhargava <adit_bh...@yahoo.com> wrote:
> 1. TFP_Steurung.ini - In this file, I have under [EMCMOT] section,
> SERVO_PERIOD = 1000000(1 ms)
> Should I put my BASE_PERIOD = 100000 (100 microsec) ?
The actual thread is created by the "loadrt motmod ...." line in the HAL file.
Values may be substituted into that line from the INI, but adding
values to the INI that are not referenced in the HAL will not have any
effect.
Your HAL file might well have "loadrt [EMCMOT]EMCMOT ..." though there
is no defined standard here, just custom and habit.
Basically the INI file can contain almost anything, it is up to the
HAL file (and HAL components) how that data is used.
So, there are a couple of things you can do, either edit the "loadrt
[EMCMOT]EMCMOT... line to create two threads according to the format
in the manual page, or just write it all out explicitly.
I prefer the second option in my own configs.
loadrt motmod base_period_ns=100000 servo_period_ns=1000000 (and the
rest to match the existing config).
To add a thread _slower_ than existing threads you can use the
"threads" HAL call:
http://linuxcnc.org/docs/2.7/html/man/man9/threads.9.html
And that lets you choose the name of the threads too. However I doubt
that would work well with motmod, which likes to create threads with
defined names, and as threads need to be created fastest to slowest I
suspect this way would be more trouble
> I tried to change base period, but seems my file dosen't compile. I don't
> have any idea how to compile this file. Can you please suggest something how
> to compile ?
You _really_ don't need to recompile motion to achieve what you want
to achieve. You just need to pass the corrct parameters to the motion
component.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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