问题：

stm32 免费开发工具

解决：

 

http://www.openstm32.org/Downloading+the+System+Workbench+for+STM32+installer

http://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools.html?querycriteria=productId=SC2106