PIC單片機紅外遙控編碼與解碼的問(wèn)題分享
一般常用的紅外遙控器編碼規則都差不多,基本上都同6221原理一樣
本文引用地址:http://dyxdggzs.com/article/172729.htm如果用54,57這類(lèi)片子做的話(huà)有一定的難度(假如要做成實(shí)時(shí)控制的;比如說(shuō)你還要驅動(dòng)顯示,驅動(dòng)步進(jìn)電機,在加上幾個(gè)按鍵)原因就是這類(lèi)片子沒(méi)有中斷
例程如下(用來(lái)解6221;分頻比為256)
RF:
BTFSC PORTB,2;;B2口用做接收口
GOTO RF1
BTFSS DOWNBIT;;檢測下降沿標制
CLRF RTCCOUNT
BSF DOWNBIT;制下降沿標制
BTFSS UPBIT;;檢測上升沿標制
RETLW 0
BTFSC IDBIT;;檢測碼頭標制
GOTO RF3
MOVLW 2AH
SUBWF RTCCOUNT,0
BTFSS STATUS,0
GOTO RF2
MOVLW 36H
SUBWF RTCCOUNT,0
BTFSC STATUS,0
GOTO RF2
BTFSC IDBIT
GOTO RF3
MOVLW .8
MOVWF LOOP
MOVLW .3
MOVWF LOOPCOUNT
CLRF DATACOUNT
BSF IDBIT
BSF DOWNBIT
BCF UPBIT
CLRF RTCCOUNT
RETLW 0
RF1:
BTFSS DOWNBIT
RETLW 0
BSF UPBIT
RETLW 0
RF2:
BCF DOWNBIT
BCF UPBIT
BCF IDBIT
CLRF RTCCOUNT
RETLW 0 ;遙控接收
RF3:
MOVLW 02H
SUBWF RTCCOUNT,0
BTFSS STATUS,0
GOTO RF4
MOVLW 0CH
SUBWF RTCCOUNT,0
BTFSS STATUS,0
GOTO RF4
GOTO RF2
RF4:
MOVLW 08H
SUBWF RTCCOUNT,0
BTFSC STATUS,0
BSF 3H,0
MOVLW 07H
SUBWF RTCCOUNT,0
BTFSS STATUS,0
BCF 3H,0
RLF DATACOUNT,1
BSF DOWNBIT
BCF UPBIT
CLRF RTCCOUNT
DECFSZ LOOP,1
RETLW 0
MOVLW .8
MOVWF LOOP
DECFSZ LOOPCOUNT
RETLW 0
BSF RFBIT;;制接收完標制
BCF DOWNBIT
BCF UPBIT
BCF IDBIT
CLRF RTCCOUNT
RETLW 0
//////////////////////////////////////////////////////////
TIME:
BTFSC TIMEPD1
GOTO TIME1
MOVF RTCC,0;;(
MOVWF TIMEONE
BSF TIMEPD1
RETLW 0 ;定時(shí)查尋
TIME1:
MOVF RTCC,0
SUBWF TIMEONE,0
BTFSC STATUS,2
RETLW 0
BCF TIMEPD1
INCF RTCCOUNT,1
RETLW 0
////////////////////////////////////////////////
在這里我是用查詢(xún)的方式來(lái)定時(shí)的(RTCCOUNT)只是在解碼時(shí)不需要去追求時(shí)間精度;我是去查RTCC有沒(méi)有發(fā)生跳變如有則表示時(shí)間過(guò)了 256US---RTCCOUNT加一;這樣做有一個(gè)好處---你不必去管RTCC具體的值是多少,(RTCC去做精確的時(shí)鐘定時(shí);在這個(gè)查詢(xún)的子程序中你可以去判斷鍵掃,顯示刷新,驅動(dòng)步進(jìn)電機等等)
相應的C代碼如下:
unsigned char rfcount,
loop,
rftime,//查詢(xún)定時(shí)器
k;
bit rfbit, //接收完標制
lowbit1,
lowbit2,
downbit,
rfgobit;
unsigned char dispcount[5];//結果
#define rfin RC6
////////////////////////////////////////////////////////////////////////////////
rf( )//遙控接收
{
if(rfbit==0)
{
if((lowbit1==0)(rfin==0))
{
downbit=1;
rftime=0;
lowbit1=1;
return;
}
if((lowbit1==1)(rfin==1))
{
lowbit2=1;
return;
}
if((lowbit1==1)(lowbit2==1)(RC6==0))
{
lowbit1=0;
lowbit2=0;
if((rftime>=40)(downbit==1))//遙控接收;
{
rfgobit=1;
loop=0;
rfcount=0;
k=1;
rftime=0;
return;
}
rfcount=rfcount+1;
loop=loop+1;
if(rfcount>=31)
{
rfgobit=0;
downbit=0;
rfcount=0;
rfbit=1;
loop=0;
return;
}
if((rftime>=7)(rfgobit==1))
{
dispcount[k]=dispcount[k]|0x80;
rftime=0;
if(loop==8)
{
k=k+1;
loop=0;
return;
}
dispcount[k]=dispcount[k]>>1;
return;
}
if((rftime5)(rfgobit==1))
{
dispcount[k]=dispcount[k]0x7f;
rftime=0;
if(loop==8)
{
k=k+1;
loop=0;
return;
}
dispcount[k]=dispcount[k]>>1;
return;
}
}
}
}
(查詢(xún)子程序同匯編)
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