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程序如下:
ORG 0000H;單片機(jī)與PC的串口通信實(shí)驗(yàn)2010,9,21
LJMP START
ORG 0023H
LJMP UARTInterrupt
START:
MOV SP,#60H
LCALL InitUART
MOV DPTR,#TAB
LOOP:MOV R0,#8
MOV R3,#00H
L: MOV A,R3
MOVC A,@A+DPTR
LCALL SendOneByte ;add your code here!
INC R3
DJNZ R0,L
LJMP LOOP
InitUART:;初始化串口;波特率9600;定時(shí)器1;方式2;
MOV TMOD,#20H
MOV SCON,#50H
MOV TH1,#0FDH
MOV TL1,TH1
MOV PCON,#00H
SETB EA
SETB ES
SETB TR1
RET
UARTInterrupt:
JB RI,IsUART_Receive;查接收標(biāo)志是接收?發(fā)送?為1表示是接收中斷相應(yīng)的,反之為發(fā)送,因?yàn)闊o(wú)論發(fā)收都會(huì)觸發(fā)中斷
CLR TI ;為0,表示不是接收中斷,兒時(shí)發(fā)完了
RETI
IsUART_Receive: ;接收數(shù)據(jù)
CLR RI
PUSH ACC
MOV A,SBUF
;========================
MOV P0,A
;========================
POP ACC
RETI
SendOneByte: ;發(fā)送數(shù)據(jù)
CLR ES
CLR TI
MOV SBUF,A
WaitSendFinish:
JNB TI,WaitSendFinish
CLR TI
SETB ES
RET
TAB:DB 30H,31H,32H,33H,34H,35H,36H,37H,38H
END
上位機(jī):Private Sub Command1_Click()
Dim aa$
MSComm1.Output = Text2.Text
aa = MSComm1.Input
Text1.Text = aa
End Sub
Private Sub Command2_Click()
Text1.Text = ""
Text2.Text = ""
End Sub
Private Sub Command3_Click()
End
End Sub
Private Sub Form_Load()
MSComm1.CommPort = 7
MSComm1.PortOpen = True
End Sub
硬件方面:RS-232數(shù)據(jù)通信線一根;MCU×8×LED;FOSC=11.0592M;
軟件方面:vb-MSCOOM控件界面做上位機(jī);
亮點(diǎn):第一次真實(shí)體驗(yàn)到原來(lái)電腦數(shù)據(jù)近在咫尺,原來(lái)鍵盤(pán)的數(shù)據(jù)是用ASCII嗎啊
結(jié)論:下一步向協(xié)議發(fā)展
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