Messages in this thread |  | | From | Sven Van Asbroeck <> | Date | Fri, 3 Apr 2020 19:50:07 -0400 | Subject | Re: (EXT) Re: [PATCH 1/4] pwm: pca9685: remove unused duty_cycle struct element |
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On Mon, Mar 30, 2020 at 11:12 AM Clemens Gruber <clemens.gruber@pqgruber.com> wrote: > > On Wed, Feb 26, 2020 at 06:03:02PM +0100, Matthias Schiffer wrote: > > As it turns out, this driver is broken in yet another way I didn't find > > before: For changing the global prescaler the chip needs to be put into > > sleep mode, but the driver doesn't follow the restart sequence > > described in the datasheet when waking it back up. In consequence, > > changing the period of one PWM does not only modify the period of all > > PWMs (which is bad enough, but can't be avoided with this hardware), > > but it also leaves all PWMs disabled... > > I am unable to reproduce this: If I set a specific duty cycle on a > channel and then change the period, the channel stays active. > I can see the brightness of an LED decrease if I increase the period.
What happens when pwm channels 0 and 1 are both enabled, and you change the pwm period of channel 0. Does channel 1 remain on?
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