4418上的LCD驱动，可实现点亮LCD，已经在开发板通过实验(4418 on the LCD driver, can achieve light LCD, has been in the development board through the experiment)

4418的cpu外设驱动源码，包括串口、液晶等，在开发板上试验成功(4418 CPU peripheral driver source code, including serial port, LCD, etc., in the development board test success)