To include any of these functions/drivers in your project... 1/ Place this halext directory into the $(CHIBIOS)/os directory 2/ In your project Makefile (amongst similiar lines but after the hal line) add the line... include $(CHIBIOS)/os/halext/halext.mk 3/ In your project Makefile add the makefiles for any specific drivers you want e.g include $(CHIBIOS)/os/halext/drivers/gdispNokia6610/gdisp.mk 4/ In your project halconf.h turn on the support you want eg. /** * @brief Enables the GDISP subsystem. */ #if !defined(HAL_USE_GDISP) || defined(__DOXYGEN__) #define HAL_USE_GDISP TRUE /* Any driver specific defines required go here */ #define GDISP_NEED_MULTITHREAD TRUE #endif 5/ Do a make clean.