——單片機(jī)串行接口技術(shù)-資料下載頁(yè)
2025-06-07 08:23本頁(yè)面
【正文】 。*******************************START: NOP NOP NOP MOV SP,60H MOV R0,30h 。串口接收緩沖區(qū)30H37H MOV R5,07H 。串口接收字符數(shù) MOV SCON,50H 。SPORT ENABLE MODE1,REN1 MOV TMOD,00100001B 。T0MODE1T,T1BAUD MOV TL0,00H 。50MS MOV TH0,4CH MOV TL1,0FDH 。9600BAUD MOV TH1,0FDH 。MOV IP,10H 。SPRIORITY SETB EA 。INTERUPT ENABLE SETB ES 。SINTENABLE SETB ET0 。T0INTENABLE 。SETB ET1 。T1INTENABLE SETB TR0 。START T0 SETB TR1 MOV R2,20 。20*50MS=1000MS MOV 50H,00H MOV 51H,00H MOV 40H,40H MOV 41H,40H MOV 52H,00H MOV 53H,00H MOV 42H,40H MOV 43H,40H CLR 。*******************************DISP0: jb ,seldisp lcall disp1 ajmp disp0seldisp:lcall disp2 LJMP DISP0 disp1: MOV P0,40H SETB LCALL DELAY CLR MOV P0,41H SETB LCALL DELAY CLR MOV P0,42H SETB LCALL DELAY CLR MOV P0,43H SETB LCALL DELAY CLR ret disp2: MOV P0,44H SETB LCALL DELAY CLR MOV P0,45H SETB LCALL DELAY CLR MOV P0,46H SETB LCALL DELAY CLR MOV P0,47H SETB LCALL DELAY CLR ret。*******************************DELAY: MOV R7,08HDY1: MOV R6,0F8H DJNZ R6,$ DJNZ R7,DY1 RET。*******************************CNT0: PUSH ACC PUSH PSW lcall key DJNZ R2,OUTT1 SETB INC 50H MOV A,50H ANL A,0FH MOV 50H,A CJNE A,0AH,AAA MOV 50H,00H INC 51H MOV A,51H CJNE A,06H,BBB MOV 51H,00H INC 52H MOV A,52H CJNE A,0AH,CCC CLR 。BEEP MOV 52H,00H INC 53H MOV A,53H CJNE A,0AH,DDD MOV 53H,00HDDD: MOV A,53H ANL A,0FH MOV DPTR,TAB1 MOVC A,@A+DPTR MOV 43H,A CCC: MOV A,52H ANL A,0FH MOV DPTR,TAB1 MOVC A,@A+DPTR MOV 42H,A BBB: MOV A,51H ANL A,0FH ADD A,0AH MOV DPTR,TAB1 MOVC A,@A+DPTR MOV 41H,A AAA: MOV A,50H ANL A,0FH ADD A,0AH MOV DPTR,TAB1 MOVC A,@A+DPTR MOV 40H,A CPL MOV R2,20OUTT1: MOV TL0,00H MOV TH0,4CH POP PSW POP ACC RETI。*******************************SCINT: PUSH ACC PUSH PSW CLR ET0 。串口接收數(shù)據(jù)程序，數(shù)送30H37H CLR RI MOV A,SBUF CJNE A,0DDH,NEX1 。收到數(shù)據(jù)頭標(biāo)志DDH后接收,置位20H為1 SETB 20H 。NEX1: JNB 20H,OUT1 MOV @R0,A INC R0 DJNZ R5,OUT1 CLR 20H MOV R0,30H 。save in 30h37h MOV R5,07H MOV A,34H 。把接收到的數(shù)據(jù)轉(zhuǎn)換成顯示代碼 ANL A,0FH MOV DPTR,TAB1 MOVC A,@A+DPTR MOV 47H,A MOV A,33H ANL A,0FH MOV DPTR,TAB1 MOVC A,@A+DPTR MOV 46H,A MOV A,32H ANL A,0FH ADD A,0AH MOV DPTR,TAB1 MOVC A,@A+DPTR MOV 45H,A MOV A,31H ANL A,0FH ADD A,0AH MOV DPTR,TAB1 MOVC A,@A+DPTR MOV 44H,A lcall trans 。串口發(fā)送數(shù)據(jù)到PC OUT1: SETB ET0 POP PSW POP ACC RETI。*******************************trans: PUSH ACC PUSH PSW CLR EA 。RS485 發(fā)送控制 MOV A,0DDH 。 MOV SBUF,A 。發(fā)送數(shù)據(jù)，第一個(gè)數(shù)據(jù)為DDH,共8個(gè)字節(jié) JNB TI,$ CLR TI MOV SBUF,50H 。第二個(gè)字節(jié)為 JNB TI,$ CLR TI MOV SBUF,51H 。第三個(gè)字節(jié)為 JNB TI,$ CLR TI MOV SBUF,52H 。待用3個(gè)字節(jié)52H，53H，54H JNB TI,$ CLR TI MOV SBUF,53H JNB TI,$ CLR TI MOV SBUF,54H JNB TI,$ CLR TI MOV A,0DDH XRL A,50H XRL A,51H XRL A,52H XRL A,53H XRL A,54H MOV SBUF,A 。BCC校驗(yàn)數(shù)據(jù) JNB TI,$ CLR TI MOV SBUF,0FFH 。數(shù)據(jù)結(jié)束標(biāo)志 JNB TI,$ CLR TI POP PSW POP ACC SETB EA RET。********************************KEY: setb setb setb setb 。按鍵處理子程序 MOV A,P1 CPL A ANL A,00001111B JZ GORET LCALL DELAY JB ,KEY0 JB ,KEY1 JB ,KEY2 JB ,KEY3GORET: RETKEY0: clr RETKEY1: clr RETKEY2: setb RETKEY3: setb RETTAB1: DB 60H,7BH,0A2H,2AH,39H,2CH,24H,7AH,20H,28H 。NO POINTER 09 DB 40H,5BH,82H,0AH,19H,0CH,04H,5AH,00H,08H 。HAVE POINTER . END
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