Fatal error: core_cm4.h: No such file or directory Posted by nichtgedacht on 2017-01-20 15:57 Hi The obvious thing to do, find core_cm4.h ( ./Drivers/CMSIS/Include/core_cm4.h ?) If found, is the directory where it lies included? ( ./Drivers/CMSIS/Include/ ?) If not, why not ? Dieter