Yes Andy, I also checked the documentation of pwmgen is wrong.pwm-freq is a hal
pin
I did these steps as suggested by you but the output on CRO is not as it should
be according to frequency of 150 Hz and duty cycle of 29.9% (pulses of T-on =
2ms and T-off = 4.7 ms)
Are below steps correct?
I checked the values of tristate-float.0.in, tristate-float.0.out and
pyvcp.signal-frequency-value .THey are all 150 Hz
net PWM-Freq tristate-float.0.in <= pyvcp.signal-frequency-value
setp tristate-float.0.enable TRUE // Sets the tristate OUT as IN
net PWM-OUT tristate-float.0.out => pwmgen.0.pwm-freq
BRAdit
From: andy pugh <[email protected]>
To: Enhanced Machine Controller (EMC) <[email protected]>
Sent: Tuesday, May 3, 2016 3:26 PM
Subject: Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle,
frequency, etc, ) from GUI ?
On 3 May 2016 at 13:56, Nicklas Karlsson <[email protected]> wrote:
> Yes you are correct.
No, actually, I am wrong.
I just checked the source and the manual page is incorrect.
https://github.com/LinuxCNC/linuxcnc/blob/master/src/hal/components/pwmgen.c#L503
adit: The pwm frequency _is_ settable as a HAL pin, you _can_ just net
the PyVCP pin to the frequency.
The only wierdness is that the change that swapped a lot of HAL
parameters to HAL pins defined the pins as the HAL_IO type, ie
bidirectional pins. (I think this was a mistake)
This means that you need to use an extra HAL component between the
PyVCP pin and the pwmgen pin:
http://linuxcnc.org/docs/2.7/html/man/man9/tristate_float.9.html
The tristate component is probably not actually intended for this
application, but it works.
--
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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