stm32驱动三轴加速/重力感应/MMA7455,选用SPI 通信模式-stm32-driven three-axis acceleration/gravity sensor/MMA7455, SPI communication mode selection

基于STM32的MMA7455三轴加速度传感器驱动程序，测试通过，并对程序进行注释和风格等优化，方便用户的使用-Annotate and style optimization based on the STM32 MMA7455 the triaxial acceleration sensor driver, tested, and procedures to facilitate the user' s