GEX port to STM32F072. This is currently the main port.
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gex-f072/GexUnits/neopixel/ws2812.h

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#ifndef WS2812_H
#define WS2812_H
#include "platform.h"
/**
* Load RGBs from a packed byte stream
*
* @param port
* @param ll_pin
* @param rgbs - packed R,G,B, R,G,B, ... array
* @param count - number of pixels (triplets)
*/
void ws2812_load_raw(GPIO_TypeDef *port, uint32_t ll_pin, const uint8_t *rgbs, uint32_t count);
/**
* Load all pixels with BLACK (0,0,0)
*
* @param port
* @param ll_pin
* @param count - number of pixels
*/
void ws2812_clear(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t count);
/**
* Load from a stream of 32-bit numbers (4th or 1st byte skipped)
* @param port
* @param ll_pin
* @param rgbs - payload
* @param count - number of pixels
* @param order_bgr - B,G,R colors, false - R,G,B
* @param zero_before - insert padding byte before colors, false - after
*/
void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, const uint8_t *rgbs, uint32_t count,
bool order_bgr, bool zero_before);
#endif //WS2812_H