STM32F103 control PCF8574 procedures, add code to modify IO can be used directly.

Filename	Size	Update
PCF8574代码\PCF8574H.h	704	2017-01-17
PCF8574代码\PCF8574_F.c	5126	2017-08-30
PCF8574代码\PCF8574_Function.c	4752	2017-08-29
PCF8574代码\PCF8574_S.c	5127	2017-08-30
PCF8574代码	0	2018-08-02

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