C8051f410串口通信接口設(shè)計(jì)實(shí)驗(yàn)

1、實(shí)驗(yàn)二UART通信接口設(shè)計(jì)實(shí)驗(yàn)一、實(shí)驗(yàn)?zāi)康?、理解用異步串行通信進(jìn)行RS232通信的原理并能掌握其方法及編程；2、學(xué)習(xí)使用定時(shí)器T2做波特率發(fā)生器，掌握計(jì)算波特率的方法。二、實(shí)驗(yàn)儀器1、自制的C8051f410實(shí)驗(yàn)開(kāi)發(fā)板1塊2、直流穩(wěn)壓電源、示波器各1臺(tái)3、仿真器（U-EC6）1只4、PC機(jī)1臺(tái)三、實(shí)驗(yàn)內(nèi)容實(shí)驗(yàn)任務(wù)：編寫(xiě)程序?qū)纹瑱C(jī)的P0.4、P0.5II配置為串1丨0通信II,將PC機(jī)發(fā)送給c8051f410的數(shù)據(jù)原樣發(fā)回PC機(jī)，程序中用“OxOd”作為幀尾標(biāo)志。PC端發(fā)送、接收可采用串II接收軟件“串II調(diào)試助手V21”。在程序中通過(guò)交叉開(kāi)關(guān)配置TXO,RX0分別到P0.4、P0.5引腳，

2、由于I/OII是TTL電平信號(hào)，需要通過(guò)MAX232轉(zhuǎn)換為RS-232電平后才能與PC機(jī)連接，連接電路如上圖所示。vcc|-P109P1110P1211vcc|-P109P1110P1211P1312P1413P1314P1615P1716123X4X3?6_78P1.0/XTAL1P0.0IDAC0P1.1/XTAL2P0.1/IDAC1P12VREFP0.217POO18P0119P0220P03r1FU.SD1AunA2151TXDPl.5P0.5/RXPl.6P06CNVSTRPl.7P0.7VioP2.0RST/C2CKP2.1Vrtc-backupP2.2XTAL4P2.3XTAL

3、3P2.4GNDP2.52251RXD23P0624P0725P2026P2127P2228P2329P2430P2531P26VUUF厶O(píng)VreginP2.7/C2D32C8051F410/2U4C8051F410/2實(shí)驗(yàn)參考代碼:include/SFRdeclarations#defineSYSCLK24500000#defineBAUDRATE9600/SYSCLKfrequencyinHz/BaudrateofUARTinbpsunsignedcharUART_Buffer64;unsignedcharUART_Data=0;staticcharByte;/P0.4digitalpus

4、h-pullUARTTX/P0.5digitalopen-drainUARTRXvoidPORT_Init(void)POMDOUT1=0 x10;XBR0=0 x01;/EnableUTXaspush-pulloutput/EnableUARTonP0.4(TX)andP0.5(RX)XBR1=0 x40;/Enablecrossbarandweakpull-upsvoidSYSCLKJnit(void)OSCICN=0 x87;RSTSRC=0 x04;/configureinternaloscillatorfor24.5MHz/enablemissingclockdetector/Con

5、figuretheUARTOusingTimerLforand8-N-l.voidUARTOJnit(void)SCON0=0 xI0:/SCONO:8-bitvariablebitrate/levelofSTOPbitisignored/RXenabled/ninthbitsarezeros/clearRIOandTI0bitsTHI=0 x96;CKCON&=OxOB:TLl=TH1;TMOD&=OxfO:TMOD1=0 x20;TRI=1:/initTimer1/TMOD:timer1in8-bitautoreload/STARTTimer1IP1=0 x10:/MakeUARThigh

6、priorityES0=1;/EnableUARTOinterruptsvoidUARTO_Internipt(void)internipt4if(RIO=1)/Clearinterruptflag/ReadacharacterfromUART/Storeinarray/Clearinterruptflag/ReadacharacterfromUART/Storeinarray/WDTE=0(clearwatchdogtimerenable)/InitializePortI/O/InitializeOscillatorByte=SBUFO;UART_BufferUART_Data=Byte;U

7、ART_Data+;)voidmain(void)unsignedchari;PCAOMD&=0 x40;PORTJnit();SYSCLK.Init();UARTOJnitO：EA=I;while(l)if(UART_Data!=0)&(Byte=13)for(i=0;iUART_Data;i+)SBUFO=UART_Bufferi:while(JTIO);TIO=0:UART_Data=0;)四、實(shí)驗(yàn)現(xiàn)象和結(jié)果1、把串II線和PC機(jī)連接起來(lái)，運(yùn)行程序后，通過(guò)串II調(diào)試軟件發(fā)送ASCII碼字符(需要以回車(chē)鍵結(jié)尾)到單片機(jī)實(shí)驗(yàn)板，單片機(jī)實(shí)驗(yàn)板接收到從串II調(diào)試軟件發(fā)送過(guò)來(lái)的ASCII碼字符后，又將同樣的字符回送給串II調(diào)試軟件，這樣串丨I調(diào)試軟件可以看到返回同樣的字符，如果收發(fā)的字符相同，則說(shuō)明PC機(jī)與單片機(jī)實(shí)驗(yàn)板之間的通信成功，如下圖所示。注：串口通信波特率、位數(shù)據(jù)位、停止位、校驗(yàn)等參數(shù)設(shè)置值參考上圖。五、預(yù)習(xí)要求1、讀懂程序;2