Add support for ESP32 3.0 API

[IsmaCortGtz]

I added support for the new ESP32 API. There were some breaking changes with the LEDC API.

I implemented the @The39thBit suggestion in #16 and replaced ledcWrite (that now only works with a PIN number) for ledcWriteChannel.

Additionally, it would be nice to add a note informing people about this breaking change.

[dzalf]

I just want to confirm that these changes will bring the library back to life (gracias @IsmaCortGtz! Salud, chingao 🍺)

@wilmouths, are you still maintaining this repo?

Cheers
🍻

[wilmouths]

I have to test the changes, I'm not very present on this repository at the moment.

I'll take care of it soon

[fr-fhe]

Hi all,

Tested this commit on ESP32-S2, and it doesn't work (no action at all on an rgb led).
But removing ESP32 code and using analogWrite() works...

S2 specific ?

Please note some things about your commit :
1/ cosmetic bug ? => ledcAttachChanel on blue is parametred at a 50Khz freq when R+G are at 5Khz freq. Please harmonize.
2/ according to espressif (https://docs.espressif.com/projects/arduino-esp32/en/latest/api/ledc.html), you must initialize LEDC system with ledcSetClockSource

I note that LEDC pins are hard coded (0,1,2), making unable to use another RGB Led object.
But after deeper analyse, problem is core library based... no pin allocator, in fact...
(in my case, i want to use 3 RGB Led on my S2, so ... boom)

analogWrite() solution (cf. brendanm250) seems to be the best option for now...

Just my penny :)

Take care.

H.F.

[wilmouths]

I got myself an ESP32. I'm going to test this PR this weekend and see what needs to be done to make it compatible with an ESP32.