HallSensor class working and three led blinking while rotating the (slave) wheel.
/include/config.h :
// LAYOUT_2_X is used in defines.h
//#define LAYOUT_2_0 // https://github.com/flo199213/Hoverboard-Firmware-Hack-Gen2
//#define LAYOUT_2_1 // https://github.com/krisstakos/Hoverboard-Firmware-Hack-Gen2.1
//#define LAYOUT_2_2 // 2023/05/11 only MASTER and TEST_SPEED: motor is spinning but needs a push to startup :-/
//#define LAYOUT_2_4 // NOT READY !!! https://github.com/RoboDurden/Hoverboard-Firmware-Hack-Gen2.x/issues/3
#define LAYOUT_2_5 // NOT READY !!! https://github.com/RoboDurden/Hoverboard-Firmware-Hack-Gen2.x/issues/11