Hello Andy,
I implemented your suggested code and I am getting correct values of Duty cycle
on Halscope.
However, I am NOT getting the correct values on CRO.On CRO, I get correct
values for frequencies of 100 Hz and 150 Hz
But, when I try 110 Hz , 120 Hz etc. it takes wrong period always as 10 ms
(corresponding to 100 Hz only) and the T-on is also not 2 ms which I set in the
scale.0.gain parameter (it's slightly more than 2 ms),
However, on Halscope these parameters are correct.
Below is the code I did:
loadrt pwmgen output_type=0
loadrt tristate_float
setp pwmgen.0.enable TRUE
addf hm2_5i25.0.write_gpio base-thread
addf pwmgen.make-pulses base-thread
addf pwmgen.update base-thread
addf tristate-float.0 servo-thread
net PWM-Freq tristate-float.0.in <= pyvcp.CO-frequency-value //frequency value
from Axis Gui
setp tristate-float.0.enable TRUE
net PWM-OUT tristate-float.0.out => pwmgen.0.pwm-freq
loadrt scale
net PWM-Freq scale.0.in // from above
setp scale.0.gain 0.002
net duty-cycle scale.0.out pwmgen.0.value // Setting the Duty cycle
addf scale.0 base-thread //Added to base-thread
setp hm2_5i25.0.gpio.023.is_output TRUE
setp hm2_5i25.0.gpio.023.invert_output FALSE
net pwm-generate <= pwmgen.0.pwm
net pwm-generate => hm2_5i25.0.gpio.023.out
BRAdit
From: andy pugh <bodge...@gmail.com>
To: adit bhargava <adit_bh...@yahoo.com>
Cc: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net>
Sent: Tuesday, May 3, 2016 7:00 PM
Subject: Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle,
frequency, etc, ) from GUI ?
On 3 May 2016 at 16:12, adit bhargava <adit_bh...@yahoo.com> wrote:
> Thank you very much Andy. I forgot to add tristate_float to thread. Now, I
> addeed to my base-thread and the output comes now on CRO.
You should add it to the servo-thread really, there is no need to
update the value at base-thread speed.
> Duty-Cycle = ( 2 ms / Period )( where Period = 1/ Signal freq)
>
> How should I implement this formula in .HAL file?
That simplifies to DutyCycle = 2mS * frequency (which passes a units
check, but doesn't seem right)
You would use the HAL "scale" component:
http://linuxcnc.org/docs/2.7/html/man/man9/scale.9.html
(It is probably worth a skim through all the real-time components
listed in the section near the bottom of
http://linuxcnc.org/docs/2.7/html/ )
net PWM_freq scale.0.in
setp scale.0.gain 0.002
net dc scale.0.out pwmgen.0.value
Or similar.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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