Thans a lot for the contribution of my classmate Yuqiu Huang（黄宇秋） from the school of Mechanical Engineering in Shanghai Jiao Tong University
This program is a project for MCU stm32f103zet6 to achieve I2C communication. We should be aware that this is software I2C. In reality, this program could drive many I2C buses and this is the biggest benefit
please pay attention to the start-up file, we should use "startup_stm32f10x_hd.s" rather than the default one, or there will be some problems.
We should put all these file in the dir of [prjname]/user/