IRDecode:
USING 2
PUSH PSW
MOV PSW,#010H
MOV R1,#200;
MOV R2,#90;
MOV R3,#00;
MOV R4,#24;
MOV R5,#00;
MOV R6,#00;
MOV R7,#00;
CLR IRFcodeEN; ;解码正确标志
Playhead:
JB iIRF,Playdata ;为1跳
NOP ;0.5
DJNZ R1,Playhead ;1.5 0.5+200*0.5+1.5=102us
MOV R1,#200;
DJNZ R2,Playhead
JMP IRDecodeEnd ;超时退出
Playdata: ;说明10MS之内有高电平出现
JB IRreleaseEN,IRDecodeEnd1
MOV R1,#80
PlaydataLOOP:
JNB iIRF,nextdata1
CALL delay100us
DJNZ R1,PlaydataLOOP
JMP IRDecodeEnd ;为0,高电平大于600US,退出
nextdata1: ;if(300<hihg<600) c=1
MOV A,#56
SUBB A,R1
JNC datahigh ;是高电平出现,跳到高电平的低出现
;======================================================当<300时,看是否在90<>200之间
MOV A,#76
SUBB A,R1
JNC datalow
JMP IRDecodeEnd ;R<90,错误退出
datalow:
; MOV A,#50
; SUBB A,R1
; JNC IRDecodeEnd ;R>20,错误退出
;====================================================低电平的高检测
MOV R1,#80
datalowLOOP:
JB iIRF,datalow1 ;1.5
CALL delay100us ;11.5
DJNZ R1,datalowLOOP ;12.5
JMP IRDecodeEnd ;>600退出
datalow1:
MOV A,#56
SUBB A,R1
JC IRDecodeEnd ;300>退出
CLR C
JMP STARTBIT
;====================================================高电平的低检测
datahigh:
MOV R1,#30
datahighlooop:
JB iIRF,datahigh1
CALL delay100us
DJNZ R1,datahighlooop
JMP IRDecodeEnd ;说明低电平时间大于200,退出
datahigh1:
MOV A,#23 ;90<low<200
SUBB A,R1
JNC _1BIYOVER
JMP IRDecodeEnd ;LOW>80,数据错误退出
_1BIYOVER:
SETB C
STARTBIT:
MOV A,R5
RRC A
MOV R5,A
MOV A,R6
RRC A
MOV R6,A
MOV A,R7
RRC A
MOV R7,A
DJNZ R4,Playdata
SETB IRFcodeEN ;解码正确标志位为1
MOV IRcode3,R5
MOV IRcode2,R6
MOV IRcode1,R7
SETB IRreleaseEN
JMP IRDecodeEnd1
IRDecodeEnd:
CLR IRreleaseEN
IRDecodeEnd1:
POP PSW
RET
;=====================================
RSEG ?PR?delay100us?2262
delay100us: ;10us
MOV R2,#10
delay100loop:
DJNZ R2,delay100loop
RET
END |
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