GCC Toolchain for CoreSTM32

Why GCC toolchain 100% opensource and free Controll everything of CoreSTM32 High performance Setting up GCC toolchain You have two choices: GCC for ARM. https://launchpad.net/gcc-arm-embedded OR Sourcery CodeBench Lite(formerly Code Soucery). http://www.mentor.com/embedded-software/sourcery-tools/sourcery-codebench/editions/lite-edition/ Using IDE(Integrated Development Environment) I prefer Eclipse, but you have multiple choices, like Eclipse: http://www.eclipse.org/downloads CooCox IDE(Eclipse based): http://www.coocox.org/index.html EmIDE: http://emide.org/ Code::Blocks: http://www.codeproject.com/Tips/601093/Creating-STM-Microcontroller-Project-in-Code-Blo