LEDC - Allow custom channel selection

[P-R-O-C-H-Y]

Description of Change

This PR adds a new API ledcAttachChannel to LEDC peripheral, so the LEDC channel can be specified and won't be automatically selected, like is done by the ledcAttach function.

bool ledcAttachChannel(uint8_t pin, uint32_t freq, uint8_t resolution, uint8_t channel);

Also added info log message what channel is used when LEDC is attached to pin.

Tests scenarios

Tested on ESP32-C6 with edited LEDC Software fade example.

Related links

Closes #8967

[github-actions]

	Warnings
⚠️	Please consider squashing your 6 commits (simplifying branch history).

👋 Hello P-R-O-C-H-Y, we appreciate your contribution to this project!

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[lucasssvaz]

LGTM

[me-no-dev]

what happens on ESP32 where we have 2x8 channels?

[P-R-O-C-H-Y]

what happens on ESP32 where we have 2x8 channels?

You can select channel 0-15.

[Hs-Cheng]

Excuse me, I just want to ask if the above modification to the ledc library has been added to the 3.0.0-Alpha3 version? Can I download the newest code if I download 3.0.0-Alpha3 from the Arduino IDE?

Thank you.

[P-R-O-C-H-Y]

Excuse me, I just want to ask if the above modification to the ledc library has been added to the 3.0.0-Alpha3 version? Can I download the newest code if I download 3.0.0-Alpha3 from the Arduino IDE?

Thank you.

Hello @Hs-Cheng, this change was not merged yet. If you want to test/use this modification you need to manually update the source code with changes from this PR or if you use manual installation instead of board manager in Arduino IDE, you can simply checkout this PR.