PIC單片機(jī)滾動(dòng)碼解碼C程序

1、/PIC單片機(jī)滾動(dòng)碼解碼C程序/Iiitemiptbasedreceiveroutine/CompiledusingHiTechPICCcompilerv.7.93defineCLOCK4/MHz#defineTE400/us#defineOVERSAMPLING3/definePERIOD/TE/OVERSAMPLING*4/CLOCK#defineNBIT65/numberofbittoreceive-l(HCS30066-1=65)unsignedcharB9;/receivebufferstaticbyteRFstate;/receiverstatestaticsbyteRFcount

2、;/tunercounterstaticbyteBptr;/receivebufferpointerstaticbyteBitCount;/receivedbitscounterwordXTMR;/16bitextendedtimervolatilebitRFFull;/bufferfiillvolatilebitRFBit;/sampledRFsignaldefineTRFreset0defineTRFSYNC1defineTRFUNO2defineTRFZERO3defineHIGH_TO-10/longestliighTe#defineLOW_TO10/longestlowTedefin

3、eSHORT_HEAD20/shortestTheadaccepted2JmsdefineLONG_HEAD45/longestTheadaccepted6,2ms#piagniaint_rtcc/installasmtemipthandler(coimuentforHiTech!)voidinten-upti-xi(void)/tliisloutinegetscalledeverytuneTMR0overflowsRFBit=RFhi:/samplingRFpinverify!TMR0-=PERIOD;/reload;T0IF=0;XTMR+;/extended16longtunerupda

4、te;if(RFFull)/avoidovernin;return;switch(RFstate)/statemacliiiieniaiiiswitchcaseTRFUNO:if(RFBit)/whilehighRFcount-;if(RFcount=0)BBptr+=0 x80;RFcount=0;if(-H-BitCount&7)=0)Bptr+;if(BitCount=NBIT)RFstate=TRFreset;RFFull=TRUE;else/stilllowRFcount+；if(RFcount=LOW_TO)RFstate=TRFSYNC;Bptr=0;BitCount=0;/re

5、setiftoolong/rotate/sliiftinbit/resetlengtlicounter/advanceonebyte/finishedreceiving/toolonglow/fallbackmtoRFSYNCstate/resetpomters,whilekeepcountingonbreak;caseTRFSYNC:if(RFBit)/risingedgedetected/if(RFcount=LONG_HEAD)RFstate=TRFreset;break;elseRFcount=0;RFstate=TRFUNO;else/stilllowRFcount+；break;caseTRFreset:初始狀態(tài)default:RFstate=TRFSYNC;RFcount=0;Bptr=0;BitCount=0;/tooshort/long,noheader/restartcounter合適的長(zhǎng)低電平信號(hào)出現(xiàn)/resetstatemacluiiemallothercasesbreak;/switch/rxivoidInitReceiver()TOIF=0;T0IE=1;GIE=1;RFstate=TRFreset;RFFuU=0;XTMR=0;/TMR0overflow