说明：  以STC单片机和1602液晶为基础，设计出的一套输入输出源驱动程序，输出位置为0~31间的整数,为-1时表示先清屏 2) 函数返回值为一整形数,表示当前光标所在位置 3) 此两个函数支持以下转义字符: \n 换行 \b 退格 \\ 输出 \
(With STC microcontroller and LCD-based 1602 to design a set of input-output source driver, the output position is an integer between 0 to 31 for-1 that the first clear screen 2) function returns the value of an integer number, that the current the cursor location 3) This two function supports the following escape characters: \ n newline \ b backspace \ \ output \)