Use PCF8574 P port expansion chip to achieve 4* 4 keypad scanning

PCF8574按键for MSP430f1611\1.dep
..........................\1.ewd
..........................\1.ewp
..........................\1.eww
..........................\1CustomSfr.sfr
..........................\Debug\Exe\1.d43
..........................\.....\Obj\1.pbd
..........................\.....\...\1.pbd.browse
..........................\.....\...\I2C.pbi
..........................\.....\...\I2C.pbi.cout
..........................\.....\...\I2C.r43
..........................\.....\...\main.pbi
..........................\.....\...\main.pbi.cout
..........................\.....\...\main.r43
..........................\.....\...\PCF8574.pbi
..........................\.....\...\PCF8574.pbi.cout
..........................\.....\...\PCF8574.r43
..........................\I2C.c
..........................\I2C.h
..........................\main.c
..........................\path.txt
..........................\PCF8574.c
..........................\PCF8574.h
..........................\settings\1.cspy.bat
..........................\........\1.dbgdt
..........................\........\1.dni
..........................\........\1.wsdt
..........................\资料\PCF8574a.pdf
..........................\....\PCF8574周立功.pdf
..........................\Debug\Exe
..........................\.....\List
..........................\.....\Obj
..........................\Debug
..........................\settings
..........................\资料
PCF8574按键for MSP430f1611

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