STM32 WS2812 Open Drain Configuration (#9414)

* update docs stm32 only and applies  to all 3 driver
* cformat

1 files changed, 11 insertions, 0 deletions

diff --git a/docs/ws2812_driver.md b/docs/ws2812_driver.md
index 51b053b9b..fe5f88585 100644
--- a/docs/ws2812_driver.md
+++ b/docs/ws2812_driver.md
@@ -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 
+```