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 Testing Program: Blink #include "stm32f10x.h" #include "stm32f10x_gpio.h" #include "stm32f10x_rcc.h" int main(void) { int i; GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); while (1) { GPIO_SetBits(GPIOA, GPIO_Pin_8); /* delay */ for (i = 0; i < 0x1000000; i++) ; GPIO_ResetBits(GPIOA, GPIO_Pin_8); /* delay */ for (i = 0; i < 0x1000000; i++) ; } }