【正文】 ,如果不進(jìn)行電平轉(zhuǎn)換,單片機(jī)跟電腦串口就不能進(jìn)行直接通信,RS232是UART的一種就意味著通信協(xié)議的格式是一樣的,只要電平統(tǒng)一了,兩者之間就可以直接通信,此處應(yīng)用了MAX232這一芯片，MAX232對兩者之間通信的數(shù)據(jù)沒有任何作用,僅僅是中介而已,而其只是負(fù)責(zé)將兩者之間的電平進(jìn)行統(tǒng)一,使兩者之間沒有通信障礙。與單電源應(yīng)用場合的標(biāo)準(zhǔn)運(yùn)算放大器相比，它們有一些顯著優(yōu)點(diǎn)。我們將上面的一路放大器的輸入調(diào)至零，然后再經(jīng)過后一級放大器，將兩者之差放大5倍。定義變量千百十個(gè)QIAN EQU 60HBAI EQU 61HSHI EQU 62HGEWEI EQU 63HTEMPMH EQU 64H TEMPML EQU 65H COUNT EQU 66H TEMPMMH EQU 67HTEMPMML EQU 68HORG 0000HLJMP MAINORG 0023HLJMP TONGXINORG 002BHLJMP ADC_ISR ORG 0080HMAIN: LCALL MAIN_INIT LCALL UART1_INIT LCALL ADC_INITAAA: LCALL SCANFKEYV LCALL DISPLAY SJMP AAAMAIN_INIT: MOV SP,70H MOV QIAN,00H MOV BAI,00H MOV SHI,00H MOV GEWEI,00H MOV COUNT,00H MOV KEYVALUE,00H MOV TEMPMH,00H MOV TEMPML,00H MOV TEMPMMH,00H MOV TEMPMML,00H RETUART1_INIT: MOV AUXR,11H MOV BRT,0FDH MOV SCON,50H MOV PCON,00H SETB EA SETB ES RETSCANFKEYV: MOV P1,0FFH MOV A,P1 CJNE A,0FDH,KEYS2 LCALL DELAY10MS MOV A,P1 CJNE A,0FDH,KEYS2 SETB EADC SJMP NOKEYKEYS2: CJNE A,0EFH,KEYS3 LCALL DELAY10MS MOV A,P1 CJNE A,0EFH,KEYS3 CLR EADC SJMP NOKEYKEYS3: CJNE A,0DFH,KEYS4 LCALL DELAY10MS MOV A,P1 CJNE A,0DFH,KEYS4 CLR CLR EA MOV R7,04HA21: MOV A,01H MOV SBUF,A JNB TI,$ CLR TI DJNZ R7,A21 SETB EA SJMP NOKEYKEYS4: CJNE A,0BFH,NOKEY LCALL DELAY10MS MOV A,P1 CJNE A,0BFH,NOKEY SETB CLR EA MOV R7,04HA22: MOV A,02H MOV SBUF,A JNB TI,$ CLR TI DJNZ R7,A22 SETB EA SJMP NOKEYNOKEY: RETADC_INIT: MOV P1ASF,01H MOV ADC_RES,00H MOV ADC_RESL,00H MOV AUXR1,04H MOV ADC_CONTR,088H LCALL DELAY10MS 。此三個(gè)模塊都疏通之后，下位機(jī)的軟件設(shè)計(jì)工作也就基本完成，接下來要做的就是簡化、優(yōu)化程序代碼。添加七個(gè)CommandButton控件作為控制按鈕，其名稱分別為“啟動測量”、“停止測量”、“啟動1號電機(jī)”、“停止1號電機(jī)”、“啟動2號電機(jī)”、“停止2號電機(jī)”、“結(jié)束系統(tǒng)”。要求變量聲明Dim label4_speedPrivate Sub Command1_Click()Dim TT(1 To 1) As ByteTT(1) = 0 = TTEnd SubPrivate Sub Command2_Click()Dim TT(1 To 1) As ByteTT(1) = 9 = TTEnd SubPrivate Sub Command3_Click() = FalseEndEnd SubPrivate Sub Command4_Click()Dim TT(1 To 1) As ByteTT(1) = 1 = TT = vbGreenEnd SubPrivate Sub Command5_Click()Dim TT(1 To 1) As ByteTT(1) = 2 = TT = vbRedEnd SubPrivate Sub Command6_Click()Dim TT(1 To 1) As ByteTT(1) = 3 = TTEnd SubPrivate Sub Command7_Click()Dim TT(1 To 1) As ByteTT(1) = 4 = TTEnd SubPrivate Sub Form_Load() = 3 = 9600,n,8,1 = InputModeBinary = 4 = True = = = = vbWhite = vbWhite = vbRed = vbRedlabel4_speed = 50 = 20 = 中國石油大學(xué)勝利學(xué)院 2009級 信息與計(jì)算科學(xué)系 自動化專業(yè)綜合設(shè)計(jì) = 0End SubPrivate Sub Timer1_Timer()Dim value%If = 0 Then = Exit SubEnd IfDim RR() As ByteDim k%, buf$buf = RR = k = Len()For k = LBound(RR) To UBound(RR)If k = 0 ThenIf Str(RR(k)) = 10 Thenbuf1 = +ElseIf Str(RR(k)) = 11 Thenbuf1 = Else: buf1 = Str(RR(k))End IfElseIf k = 3 Thenbuf1 = . + Str(RR(k))Else: buf1 = Str(RR(k))End Ifbuf = buf + buf1Next = 0If Val(buf) = Then = vbGreenExit SubElseIf Val(buf) = Then = vbRedExit SubEnd IfIf Val(buf) Val() Then = vbRed = vbWhite = Str(Val(buf)) amp。 圖42 系統(tǒng)上位機(jī)軟件設(shè)計(jì)運(yùn)行圖5. 系統(tǒng)調(diào)試與改善 系統(tǒng)調(diào)試本課程設(shè)計(jì)中系統(tǒng)調(diào)試部分就是把上位機(jī)和下位機(jī)的設(shè)計(jì)綜合起來進(jìn)行測試運(yùn)行狀態(tài)，是否與預(yù)期的效果一樣。運(yùn)行效果如圖52。出現(xiàn)調(diào)試下位機(jī)A/D轉(zhuǎn)換程序時(shí)數(shù)碼管顯示的數(shù)據(jù)始終是零點(diǎn)幾的現(xiàn)象是由模擬量處理模塊部分，上路電壓跟隨輸入端電壓不為零造成的，解決辦法就是調(diào)整電位器是的上路電壓跟隨器的輸入端電壓為零。如果沒有安裝MSDN系統(tǒng)，我們也可以從有關(guān)VB程序設(shè)計(jì)的教材中獲取解決問題的方法，這里尤其要特別提出的時(shí)，遇到問題時(shí)，不防到網(wǎng)上查找下相關(guān)資料。在理論知識的基礎(chǔ)上把自己的實(shí)踐能力提高，做到