Enable PWM #254
Enable PWM #254
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@clupprich Sorry for the delays!!! I figured that I'd work through some major updates to all Nerves systems first and then get to this. It's taking longer than expected. Suffice it to say, I think your changes are fine, but I'm not sure about enabling unconditionally. Anyone using the PWM pin as a normal GPIO will see their code break. However, maybe we just comment out enabling the pwm dtoverlay in the Anyway, just wanted to let you know that I hadn't forgotten about this. Once I get the big changes (Erlang, Buildroot, GCC, etc. updates in), I'll get to pushing this PR across the finish line and getting a release out. Thanks for submitting it! |
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@fhunleth No worries at all!
Oh, yeah, I didn't think about that (I'm very new to the embedded world). I can update my PR with your suggested changes. Thanks for maintaining this ecosystem - it's great fun to explore it! |
I copied the config flags for defconfig from https://github.com/raspberrypi/linux/blob/50a6e5cf28a24e7f4192ad6f70f472eca2097cc6/arch/arm64/configs/bcm2711_defconfig#L1508-L1513, and included the PWM overlays from https://github.com/raspberrypi/linux/tree/50a6e5cf28a24e7f4192ad6f70f472eca2097cc6/arch/arm/boot/dts/overlays.
I'm working on a little home automation project and wanted to use RPi4's PWM pins to control a led driver.
With the current system the
/sys/class/pwmdirectory wasn't present, so I googled a bit and found https://elixirforum.com/t/rpi4-hardware-pwm-dtoverlay-need-kernel-module/33264. I think I made the right modifications, it's working for me right now.