利用PIC单片机IO口模拟IIC协议小程序.doc

#INCLUDE_CONFIG _OSC_IntRC&_WDT_OFF&_MCLRE_OFF&_CP_ON #DEFINELED2 GPIO,2#DEFINELED4GPIO,4#DEFINEKEYGPIO,5#DEFINESCLGPIO,1#DEFINESDAGPIO,0KTMEQU08HKMEQU0AHMODEEQU0BHKOEQU0CHKEYDQEQU0DHIIC_TEMPEQU0EHIIC_CEQU0FHTEQU10HORG000HGOTOMAIN;=MAINCLRFGPIOMOVLW20HTRISGPIOMOVLW05HOPTION;TIMER064分频，内部弱上拉CLRFGPIOCLRFSTATUSCLRFKTMCLRFKMCLRFKEYDQCLRFKOCALLINIT_IIC;-READONEBIT;读一个字节MOVLW20HTRISGPIOCALLSTARTMOVLW0A0HCALLWRITE_IICMOVLW00HCALLWRITE_IICCALLSTARTMOVLW0A1HCALLWRITE_IICCALLREAD_IICMOVLW04HSUBWFMODE,0BTFSCSTATUS,CCLRFMODEGOTOMLOOP;-MLOOPCLRFTMR0INCFKTM,1TABLE_MODEMOVFMODE,0ADDWFPCL,1GOTOMODE0GOTOMODE1GOTOMODE2GOTOMODE3MODE0BCFLED2BCFLED4GOTOMLDSMODE1BSFLED2BCFLED4GOTOMLDSMODE2BCFLED2BSFLED4GOTOMLDSMODE3BSFLED2BSFLED4GOTOMLDS;-/以下按键检测MLDSBTFSCKEYGOTOTAIQIGOTOANXIATAIQIINCFKM,1CLRFKOMOVLW04HSUBWFKM,0BTFSSSTATUS,CGOTOMLDTSBSFKEYDQ,1CLRFKMGOTOMODE_TESTANXIAINCFKO,1CLRFKMMODE_TESTBTFSSKEYDQ,1GOTOMLDTSMOVLW0AHSUBWFKO,0;kO是否大于10，按下消抖时间是否达到50MSBTFSSSTATUS,CGOTOMLDTSINCFMODE,1CLRFKTMMOVLW04HSUBWFMODE,0BTFSCSTATUS,CCLRFMODEWT ;写一个字节CALLSTARTMOVLW0A0HCALLWRITE_IICMOVLW00HCALLWRITE_IICMOVFMODE,0CALLWRITE_IICCALLSTOPCLRFKOBCFKEYDQ,1;防止一直按下，键值发生变化。按键一次清一次键值。GOTOMLDTSMLDTSMOVLW4EH;一周时间为 5MSSUBWFTMR0,0BTFSSSTATUS,CGOTO$-3BCFSTATUS,5GOTOMLOOP;=;-IIc子程序-DELAYMOVLW06HMOVWFTDECFSZT,1GOTO$-1RETURN;-INIT_IICBSFSCLCALLDELAYBSFSDACALLDELAYRETURN;-STARTBSFSDACALLDELAYBSFSCLCALLDELAYBCFSDACALLDELAYBCFSCLCALLDELAYRETURN;-STOPBCFSDACALLDELAYBSFSCLCALLDELAYBSFSDARETURN;-WRITE_IICMOVWFIIC_TEMPMOVLW08HMOVWFIIC_CTEMPBCFSDARLFIIC_TEMP,1BTFSCSTATUS,CBSFSDACALLDELAYBSFSCLCALLDELAYBCFSCLCALLDELAYDECFSZIIC_C,1GOTOTEMPGETACKBCFSDAMOVLW21HTRISGPIOBTFSCSDAGOTO$-1CALLDELAYBSFSCLCALLDELAYBCFSCLMOVLW20HTRISGPIOCALLDELAYRETURN;-READ_IICMOVLW08HMOVWFIIC_CMOVLW21HTRISGPIORDTEMPBCFSTATUS,CBTFSCSDABSFSTATUS,CRLFIIC_TEMP,1CALLDELAYBSFSCLCALLDELAYBCFSCLCALLDELAYDECFSZIIC_C,1GOTORDTEMP