There is a manual called manual.tex in Chinese.
The SClib is only tested for ATmega16, it cannot support the others.
The Files, LCD.c and LCD.h, are based on a book, "QingSong WanZhuan AVR Danpanji". I just write a macro to let it easy when chenge the PIN used to drive LCD 1602.
The Files, USART.c and I2C.c, are based on the Datasheet of ATmega16.
His home page https://github.com/KrisYWL
For some reason I decide changing platform from ATmega16 to ATmega328, so some library will being changed stap by stap.