问 比如：
     pc与USB系统（mcu+USB芯片）之间的通信叫驱动？在USB系统内部之间的mcu与USB芯片的通信也叫驱动？？？？一个驱动在windows上编？一个在RTOS上编？
     我是想知道：在系统内部MCU与（UART，FLASH，LCD）之间的通信叫什么？而系统与PC之间的通信叫什么？是不是都叫驱动程序？有什么区别！
答 1: 摘自Linux Device Driver 2rd EditionDevice drivers take on a special role in the Linux kernel. They are distinct "black boxes" that make a particular piece of hardware repond to a well-defined internal programming interface; they hide completely the details of how the device works.