这个是用MDK编译的GPIO程序，在韦东山的书是LINUX汇编，我给修改成了ARM汇编，可以直接在MDK下编译。学习ARM汇编的朋友对你有很大帮助-This is a GPIO with MDK compiled procedures, Wei Dongshan LINUX book is a compilation of me to change into ARM assembly can be directly compiled in the MDK. Learning ARM compil