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STM32 WS2812 Open Drain Configuration (#9414)

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* update docs stm32 only and applies  to all 3 driver
* cformat
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Xelus22 2020-06-19 22:35:32 +00:00 • committed by GitHub
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docs/ws2812_driver.md
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@ -99,3 +99,14 @@ While not an exhaustive list, the following table provides the scenarios that ha
| f401/f411 | :heavy_check_mark: |
*Other supported ChibiOS boards and/or pins may function, it will be highly chip and configuration dependent.*
### Push Pull and Open Drain Configuration
The default configuration is a push pull on the defined pin.
This can be configured for bitbang, PWM and SPI.
Note: This only applies to STM32 boards.
To configure the `RGB_DI_PIN` to open drain configuration add this to your config.h file:
```c
#define WS2812_EXTERNAL_PULLUP
```