qmk-dactyl-manuform-a/users/drashna/pimoroni_trackball.h

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#pragma once
#include "quantum.h"
#include "pointing_device.h"
#ifndef TRACKBALL_ADDRESS
# define TRACKBALL_ADDRESS 0x0A
#endif
#define TRACKBALL_WRITE ((TRACKBALL_ADDRESS << 1) | I2C_WRITE)
#define TRACKBALL_READ ((TRACKBALL_ADDRESS << 1) | I2C_READ)
void trackball_set_rgbw(uint8_t red, uint8_t green, uint8_t blue, uint8_t white);
void trackball_check_click(bool pressed, report_mouse_t *mouse);
float trackball_get_precision(void);
void trackball_set_precision(float precision);
bool trackball_is_scrolling(void);
void trackball_set_scrolling(bool scroll);