基于單片機(jī)的步進(jìn)電機(jī)控制系統(tǒng)-資料下載頁(yè)
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【正文】 ,R3 DA A 。十進(jìn)制調(diào)整 MOV R3,A MOV A,R2 ADDC A,R2 DA A MOV R2,A MOV A,R1 ADDC A,R1 MOV R1,A 。雙字節(jié)十六進(jìn)制數(shù)的萬(wàn)位數(shù)不超過(guò)６，不用調(diào)整 DJNZ R0,HB20 。處理完１６ｂｉｔ RET。********************************************************************。發(fā)脈沖中斷服務(wù)子程序PULSE_GENERATOR: PUSH ACC PUSH PSW。計(jì)脈沖采集周期 DJNZ TIMCOUNTER1,DD1 MOV TIMCOUNTER1,253 DJNZ TIMCOUNTER2,DD1 MOV TIMCOUNTER2,44 MOV COUNTERL,TL1 MOV COUNTERH,TH1 MOV TL1,00H MOV TH1,00H SETB SPEEDSHOWFLAG。計(jì)發(fā)脈沖周期DD1: JNB STATUS,DD DJNZ TIMNOW1,DD CPL PULSE DJNZ STAYCOUNTER,DD6 MOV STAYCOUNTER,40 MOV A,TIMNOW CJNE A,TIMTARGET,DD4 LJMP DD6DD4: JC DD5 DEC A MOV TIMNOW,A LJMP DD6DD5: INC A MOV TIMNOW,ADD6: MOV TIMNOW1,TIMNOWDD: POP PSW POP ACC RETI。********************************************************************。鍵盤中斷服務(wù)子程序KEYBOARD: PUSH DPL PUSH DPH PUSH ACC LCALL DELAY MOV KEY1,0EFH 。列掃描始值 MOV KEY2,04H 。列數(shù)4 MOV KEY3,00H 。列值計(jì)數(shù)器清零KEYSM1: MOV A,KEY1 MOV P1,A 。列掃描 RL A MOV KEY1,A 。列掃描左移一位 ORL P1,0FH 。準(zhǔn)備讀行 MOV A,P1 。讀P1口 ANL A,0FH 。屏蔽高四位，得到行值 CJNE A,0FH,JSADD 。若被按鍵在本列，則JSADD INC KEY3 。若被按鍵不在本列,KEY3加1 DJNZ KEY2,KEYSM1 。若未掃完一遍，則循環(huán) LJMP EXIT 。掃完一遍則退出JSADD: JB ,JSADD1 。被按鍵不在0行，則JSADD1 MOV A,00H 。被按鍵在0行，則行首鍵號(hào)00H送A LJMP JSADD4JSADD1: JB ,JSADD2 。被按鍵不在1行，則JSADD2 MOV A,04H 。被按鍵在1行，則行首鍵號(hào)04H送A LJMP JSADD4JSADD2: JB ,JSADD3 。被按鍵不在2行，則JSADD3 MOV A,08H 。被按鍵在2行，則行首鍵號(hào)08H送A LJMP JSADD4JSADD3: JB ,EXIT 。被按鍵不在3行，則JSADD4 MOV A,0CH 。被按鍵在3行，則行首鍵號(hào)0CH送AJSADD4: ADD A,KEY3 。A=行首鍵號(hào)+列值 MOV DPTR,KEYTAB 。DPTR指向鍵值表 MOVC A,@A+DPTR 。查表得鍵值 MOV R5,A 。鍵值保存在R5EXIT: MOV P1,0FH 。鍵盤列掃描線置零 POP ACC POP DPH POP DPL RETI。**********************************************************************。限位開關(guān)中斷LIMIT: LCALL DELAY MOV R5,0BH RETI。*********************************************************************。鍵值表KEYTAB: DB 03H,02H,01H,00H DB 07H,06H,05H,04H DB 0BH,0AH,09H,08H DB 0FH,0EH,0DH,0CH。*********************************************************************。速度顯示表SPEEDLEVELTAB: DB 00H,1,2,3,4,5,6,7,00H。*********************************************************************。脈沖定時(shí)器初值表TIMTAB: DB 0EH,08H,06H,05H,04H,03H,02H 。轉(zhuǎn)速89,156,208,250,312,417,625。*********************************************************************。延時(shí)20ms，鍵盤消抖用DELAY: MOV DR0,40D1: MOV DR1,248 DJNZ DR1,$ DJNZ DR0,D1 RET E
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