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<set_>
Fri. funday pasted and I missed the mark. Sorry guys/gals.
<set_>
pasted = passed
<set_>
Blah.
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<effem>
Hi
<effem>
Sorry for the immediate question, but I just can't find an answer anywhere on the web.
<effem>
Rasberry supports two PWM modes: balanced and Mark / Space.
<effem>
Do you know if the same modes also exist in Beagle Bone Black?
<effem>
Otherwise, do you know which of the two modes is used in BBB?
<effem>
Thank you very much!
<set_>
PWM!
<set_>
I like PWM for specifics.
<set_>
Um, I think it handles specifics like polarity, duty_cycle, and so on.
<set_>
if you check /dev/, there may be some files you can view (depending on your image and kernel).
<zmatt>
effem: I've never heard the term "mark/space" used in the context of pwm, but it's definitely not balanced pwm. the eHRPWM peripherals do actually support balanced pwm, but the kernel driver doesn't have support for that implemented
<zmatt>
set_: you're not being helpful
<set_>
Oh!
<set_>
I know now.
<set_>
Sorry @zmatt, I will not try to help now.
<zmatt>
effem: I don't think it would be hard to implement support for balanced mode in the kernel driver, but I guess noone so far has cared enough to do so
<effem>
zmatt, I need mark / space :-)
<zmatt>
effem: you mean normal pwm, where the rising edge (or falling edge, depending on configured polarity) stays in the same place each period?
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<effem>
Balanced vs. Mark/Space refers to the method used to determine how the PWM output signals are to be generated. There are 2 algorithms, balanced and mark/space. Balanced indicates that the duty cycle will be evenly spread across the range. That is to say, the pulse width will be split into a set of shorter pulses that are distributed across the
<effem>
range. In contrast, in mark/space, the pulse is generated as a single signal called a “mark”. The time remaining in the range, range-pulseWidth , is called the “space”. No signal is present in the space duration. Mark/Space is often good enough, but as periods get longer so does the absolute time difference between the mark and space
<effem>
durations.
<zmatt>
please don't copy paste stuff into chat
<effem>
sorry
<zmatt>
okay they seem to use the term "balanced" to mean something completely different from what I assumed
<zmatt>
I think both of these terms may have been invented on the spot :P
<zmatt>
but yeah, normal pwm is what they call "mark/space"
<zmatt>
it's the only type of pwm supported on the bbb
<zmatt>
what they call "balanced pwm" doesn't look like pwm at all, it looks more like pdm or sigma-delta encoding
<zmatt>
that article seems to use a ton of non-standard terminology
<zmatt>
like calling the pwm period the "range"
<zmatt>
hmm it seems that the broadcom documentation is the source of that terminology...
<zmatt>
effem: anyway, you need not worry, this "balanced" pwm mode of the rpi is not normally how pwm outputs work
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<effem>
zmatt, you were very kind and you removed so many doubts I had!
<effem>
thanks
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<hays>
Any inside word on whether the inability to procure beaglebones is permanent or temporary?
<hays>
Also any word on an updated SOC in similar price range?
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<zmatt>
hays: the new AM62x is basically the successor to the AM335x
<zmatt>
and what beaglebones? the beaglebone black is available just fine
<hays>
really where
<hays>
hey you're right.. hmm i wonder why i couldn't find them last week.
<hays>
maybe it was the AI i was looking for
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<Guest31>
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<Guest31>
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