通过STM32F103单片机控制VL6180测距传感器测量距离，并通过串口将距离发送给上位机。本程序使用STM32片上外设IIC来通信，可以通过编程实现IO模拟IIC。(Control VL6180 to measure distance by using STM32F103, and send distance to host computer by USART. This Program using STM32's peripher