[Feature Request] Support for SSD1306 OLED fade register (23h)

[Barabas5532]

Feature Request Type

• Core functionality
• Add-on hardware support (eg. audio, RGB, OLED screen, etc.)
• Alteration (enhancement/optimization) of existing feature(s)
• New behavior

Description

According to this datasheet, the SSD1306 OLED has a register that can be used for fade out. This is missing from earlier revisions of the datasheet, but it did work on the OLEDs I have (only a single pair from the same source). It would be nice if this could be used instead of the DISPLAY_OFF when the OLED times out.

I have created a branch with a prototype implementation. I've just replaced the DISPLAY_OFF and DISPLAY_ON commands with the equivalent using the fade register.

This register also supports a blink mode, but that is not so relevant for me.

[drashna]

Looks nice, actually.

Though, OLED_DRIVER_DISPLAY_FADE for enabling it, and OLED_DRIVER_DISPLAY_FADE_INTERVAL would probably be better names.

Feel free to open up a PR, though.

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