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keychron_qmk_firmware/docs/ws2812_driver.md
Joel Challis 64b7cfe735 Refactor ps2avrgb i2c ws2812 to core (#7183) 
* Refactor ps2avrgb i2c ws2812 to core

* Refactor jj40 to use ws2812 i2c driver

* Refactor ps2avrgb template to use ws2812 i2c driver

* Add ws2812 stub files

* clang-format and driver config

* Add ws2812 driver docs

* Fix default config values

* Update tmk_core/protocol/vusb/main.c

Co-Authored-By: Drashna Jaelre <drashna@live.com>
2019-10-29 15:53:11 -07:00

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WS2812 Driver

This driver powers the RGB Lighting and RGB Matrix features.

Currently QMK supports the following addressable LEDs on AVR microcontrollers (however, the white LED in RGBW variants is not supported):

WS2811, WS2812, WS2812B, WS2812C, etc.
SK6812, SK6812MINI, SK6805

These LEDs are called "addressable" because instead of using a wire per color, each LED contains a small microchip that understands a special protocol sent over a single wire. The chip passes on the remaining data to the next LED, allowing them to be chained together. In this way, you can easily control the color of the individual LEDs.

Driver configuration

Bitbang

Default driver, the absence of configuration assumes this driver. To configure it, add this to your rules.mk:

WS2812_DRIVER = bitbang

!> ARM does not yet support WS2182. Progress is being made, but we are not quite there, yet.

I2C

Targeting boards where WS2812 support is offloaded to a 2nd MCU. Currently the driver is limited to AVR given the known consumers are ps2avrGB/BMC. To configure it, add this to your rules.mk:

WS2812_DRIVER = i2c

Configure the hardware via your config.h:

#define WS2812_ADDRESS 0xb0 // default: 0xb0
#define WS2812_TIMEOUT 100 // default: 100