Hello Andy,
Yes, I am using the software PWM component output to MESA fpga card. Still, I
can't understand why I can't get the correct output on FPGA, although I am
getting on HALSCOPE ?
Why hardware PWM and new firmware is needed and how can I get it ?
Also, is there any tutorial to " how to disable one of the step/dir channels"
on 5i25 ?
Best Regards,Adit
From: andy pugh <[email protected]>
To: adit bhargava <[email protected]>
Cc: Enhanced Machine Controller (EMC) <[email protected]>
Sent: Monday, April 18, 2016 8:48 PM
Subject: Re: [Emc-users] Need to add a faster thread base-thread with 100
microseconds, Compilation changes required !!!
On 18 April 2016 at 19:34, adit bhargava <[email protected]> wrote:
> Oscilloscope connect to 7176 daughtercard
>
> Plus: TB6 PIN24 => OUT7
> Gnd: TB3 PIN15 => GND
>
> PWM Signal Routed to OUT 7
So, you are using software PWM with a Mesa FPGA card?
It would be better to use hardware PWM in the FPGA, but that might
need a different firmware.
The GPIO on the 7i76 is only updated once per mS, at the servo-thread rate.
There is an option to control _5i25_ GPIO at a faster rate by running
the hm2_5i25.0.write_gpio function in the faster thread.
This is not the same as the 7i76 GPIO.
By default all of the 5i25 GPIO is allocated. What you could do is
disable one of the step/dir channels and use that as GPIO (the
step/dir channels are wired direct to the 5i25, the 7i76 channels are
addressed by a serial interface and handled on the 7i76). Once you
have disabled the step generator and worked out which 5i25 IO pin that
corresponds to (the dmesg output will tell you) then you can run
software PWM to that pin.
However, I think that this would also disable all the step/dir
channels on the 7i78. So it would be better to disable only one
step/dir channel for this purpose.
Better still would be a custom firmware with a PWM generator connected
to one of the step-dir pins.
Alternatively, another user recently connected the 7i76
spindle-control potentiometer output in place of the potentiometer of
one of these devices to run an RC ESC:
http://www.ebay.co.uk/itm/Mini-3CH-Servo-Tester-Servo-Consistency-Master-Tester-for-RC-Helicopter-UK-/291289742212?hash=item43d238bb84:g:kMgAAOSwrx5UXGe~
and apparently it worked well.
--
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
------------------------------------------------------------------------------
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
