第六章 ARM9串口UART及編程

第六章S3C2410的串口UART及編程

6.1S3C2410的串口UART概述6.1.1S3C2410異步串行通訊〔UART〕單元S3C2410UART單元提供3個(gè)獨(dú)立的異步串行通訊接口，皆可任務(wù)于查詢、中斷和DMA方式。運(yùn)用系統(tǒng)時(shí)鐘最高波特率達(dá)230.4kb/s，假設(shè)運(yùn)用外部設(shè)備提供的時(shí)鐘，可以到達(dá)更高的速率。每一個(gè)UART單元包含一個(gè)16字節(jié)的FIFO〔FirstInputFirstOutput，先進(jìn)先出移位存放器〕，用于數(shù)據(jù)的接納和發(fā)送。S3C2410UART支持可編程波特率、紅外發(fā)送/接納(UART2)、1個(gè)或2個(gè)停頓位、5位/6位/7位/8位數(shù)據(jù)寬度和奇偶校驗(yàn)。6.1.2波特率的產(chǎn)生波特率由一個(gè)公用的UART波特率分頻存放器(UBRDIVn)控制，UBRDIVn值計(jì)算公如下：UBRDIVn=(int)[ULK/(波特率×16)]－1或者UBRDIVn=(int)[PLK/(波特率×16)]－1式中：時(shí)鐘選用ULK還是PLK由UART控制存放器UCONn[10]的形狀決議。假設(shè)UCONn[10]=0，那么用PLK作為波特率發(fā)生器的時(shí)鐘源頻率；否那么選用ULK作為波特率發(fā)生器的時(shí)鐘源頻率。UBRDIVn的值必需在1~(216－1)之間。例如:假設(shè)ULK或者PLK等于40MHz，當(dāng)波特率為115200b/s時(shí)，那么UBRDIVn=(int)[40000000/(115200×16)]一1=int(21.7)－1=21－1=206.1.3UART通訊操作下面簡(jiǎn)單引見UART操作，關(guān)于數(shù)據(jù)發(fā)送、數(shù)據(jù)接納、中斷產(chǎn)生、波特率產(chǎn)生、查詢檢測(cè)方式、紅外方式的詳細(xì)引見，參見下面6.3節(jié)。發(fā)送數(shù)據(jù)幀是可編程的。一個(gè)數(shù)據(jù)幀包含1個(gè)起始位、5~8個(gè)數(shù)據(jù)位、1個(gè)可選的奇偶校驗(yàn)位和1~2位停頓位，停頓位經(jīng)過(guò)行控制存放器ULCONn配置。與發(fā)送數(shù)據(jù)幀類似，接納數(shù)據(jù)幀也是可編程的。接納幀由1個(gè)起始位、5~8個(gè)數(shù)據(jù)位、l個(gè)可選的奇偶校驗(yàn)位以及1~2位行控制存放器ULCONn中設(shè)定的停頓位組成。接納器還可以檢測(cè)溢出錯(cuò)、奇偶校驗(yàn)錯(cuò)、幀錯(cuò)誤和傳輸中斷，每一個(gè)錯(cuò)誤均可以設(shè)置一個(gè)錯(cuò)誤標(biāo)志。?溢出錯(cuò)誤(overrunerror)：指已接納到的數(shù)據(jù)在讀取之前被新接納的數(shù)據(jù)覆蓋；?奇偶校驗(yàn)錯(cuò)：指接納器檢測(cè)到的校驗(yàn)和與設(shè)置的不符；?幀錯(cuò)誤：指沒(méi)有接納到有效的停頓位；?傳輸中斷：表示接納數(shù)據(jù)RxDn堅(jiān)持邏輯0超越一幀的傳輸時(shí)間。在FIFO方式下，假設(shè)RxFIFO非空，而在3個(gè)字的傳輸時(shí)間內(nèi)沒(méi)有接遭到數(shù)據(jù)，那么產(chǎn)生超時(shí)。6.2UART的控制存放器6.2.1UART行控制存放器ULCONn該存放器的位6決議能否運(yùn)用紅外方式，位5、位4和位3決議校驗(yàn)方式，位2決議停頓位長(zhǎng)度，位1和位0決議每幀的數(shù)據(jù)位數(shù)。詳細(xì)如下：ULCONn[7]保管；ULCONn[6]紅外線方式，0：正常方式；1：紅外線方式；ULCONn[5：3]校驗(yàn)方式，0xx：無(wú)校驗(yàn)；100：奇校驗(yàn)；101：偶校驗(yàn)；ULCONn[2]停頓位，0：一個(gè)停頓位；1：二個(gè)停頓位；ULCONn[1：0]數(shù)據(jù)位，00：5位；01：6位；10：7位；11：8位。6.2.2UART控制存放器UCONn該存放器決議UART的各種方式。UCONn[10]1：ULK做波特率發(fā)生器；0：PLK做波特率發(fā)生器。UCONn[9]1：Tx中斷電平觸發(fā)；0：Tx中斷脈沖觸發(fā)。UCONn[8]1：Rx中斷電平觸發(fā)；0：Rx中斷脈沖觸發(fā)。UCONn[7]1：接納超時(shí)中斷允許；0：接納超時(shí)中斷制止。UCONn[6}1：產(chǎn)生接納錯(cuò)誤中斷；0：不產(chǎn)生接納錯(cuò)誤中斷。UCONn[5]l：發(fā)送直接傳給接納方式(loopback)；0：正常方式。UCONn[4]1：發(fā)送延續(xù)信號(hào)；0：正常方式發(fā)送。UCONn[3:2]發(fā)送方式選擇：00：制止發(fā)送；01：中斷或查詢方式；10：DMA0懇求(UART0)，DMA3懇求(UART2)；11：DMAl懇求(UART1)。UCONn[1：0]接納方式選擇。00：制止接納；01：中斷或查詢方式；10：DMA0懇求UART0，DMA2懇求UART2；11：DMAl懇求UART1。6.2.3UARTFIFO控制存放器UFCONnUFCONn[7:6]00：TxFIFO存放器中有0字節(jié)就觸發(fā)中斷；01：TxFIFO存放器中有4字節(jié)就觸發(fā)中斷；10：TxFIFO存放器中有8字節(jié)就觸發(fā)中斷；11：TxFIFO存放器中有12字節(jié)就觸發(fā)中斷。UFCONn[5:4]00：RxFIFO存放器中有4字節(jié)就觸發(fā)中斷；01：RxFIFO存放器中有8字節(jié)就觸發(fā)中斷；10：RxFIFO存放器中有12字節(jié)就觸發(fā)中斷；11：RxFIFO存放器中有16字節(jié)就觸發(fā)中斷。UFCONn[3]保管。UFCONn[2]1：FIFO復(fù)位清零TxFIFO；0：FIFO復(fù)位不清零TxFIFO。UFCONn[1]1:FIFO復(fù)位清零RxFIFO；0：F1FO復(fù)位不清零RxFIFO。UFCONn[0]1：允許FIFO功能；0：制止FIFO功能。6.2.4UARTMODEM控制存放器UMCONnUMCONn[7：5]保管，必需全為0。UMCONn[4]1：允許運(yùn)用AFC方式；0：制止運(yùn)用AFC方式。UMCONn[3]保管，必需全為0。UMCONn[0]1：激活rRTS；0：不激活rRTS。6.2.5發(fā)送存放器UTXH和接納存放器URXH這兩個(gè)存放器存放發(fā)送和接納的數(shù)據(jù)，當(dāng)然只需1字節(jié)(8位數(shù)據(jù))。需求留意的是，在發(fā)生溢出錯(cuò)誤時(shí)，接納的數(shù)據(jù)必需被讀出來(lái)，否那么會(huì)引發(fā)下次溢出錯(cuò)誤。6.2.6發(fā)送和接納形狀存放器UTRSTATnUTRSTATn發(fā)送和接納形狀存放器包括UTRSTAT0,UTRSTAT1andUTRSTAT2UTRSTATn存放器各位定義：UTRSTATn[1]發(fā)送緩沖器空標(biāo)志0=不空；1=空。UTRSTATn[0]接納緩沖器有接納數(shù)據(jù)標(biāo)志0=空；1=接納緩沖器有數(shù)據(jù)。6.2.7波特率分頻存放器UBRDIV波特率分頻存放器UBRDIV的定義和運(yùn)用在6.1.2中已表達(dá)，不再反復(fù)。6.2.8UART單元各存放器的定義在隨書提供的軟件包2410test中，在2410addr.h文件中有關(guān)于UART單元各存放器的定義。//UART#definerULCON0(*(volatileunsigned*)0x50000000)//UART0Linecontrol#definerUCON0(*(volatileunsigned*)0x50000004)//UART0control#definerUFCON0(*(volatileunsigned*)0x50000008)//UART0FIFOcontrol#definerUMCON0(*(volatileunsigned*)0x5000000c)//UART0Modemcontrol#definerUTRSTAT0(*(volatileunsigned*)0x50000010)//UART0Tx/Rxstatus#definerUERSTAT0(*(volatileunsigned*)0x50000014)//UART0Rxerrorstatus#definerUFSTAT0(*(volatileunsigned*)0x50000018)//UART0FIFOstatus#definerUMSTAT0(*(volatileunsigned*)0x5000001c)//UART0Modemstatus#definerUBRDIV0(*(volatileunsigned*)0x50000028)//UART0Baudratediviaor#definerULCON1(*(volatileunsigned*)0x50004000)//UART1Linecontrol#definerUCON1(*(volatileunsigned*)0x50004004)//UART1Control#definerUFCON1(*(volatileunsigned*)0x50004008)//UART1FIFOcontrol#definerUMCON1(*(volatileunsigned*)0x5000400c)//UART1Modemcontrol#definerUTRSTAT1(*(volatileunsigned*)0x50004010)//UART1Tx/Rxstatus#definerUERSTAT1(*(volatileunsigned*)0x50004014)//UART1Rxerrorstatus#definerUFSTAT1(*(volatileunsigned*)0x50004018)//UART1FIFOstatus#definerUMSTAT1(*(volatileunsigned*)0x5000401c)//UART1Modemstatus#definerUBRDIV1(*(volatileunsigned*)0x50004028)//UART1Baudratedivisor#definerULCON2(*(volatileunsigned*)0x50008000)//UART2Linecontrol#definerUCON2(*(volatileunsigned*)0x50008004)//UART2Control#definerUFCON2(*(volatileunsigned*)0x50008008)//UART2FIFOcontrol#definerUMCON2(*(volatileunsigned*)0x5000800c)//UART2Modemcontrol#definerUTRSTAT2(*(volatileunsigned*)0x50008010)//UART2Tx/Rxstatus#definerUERSTAT2(*(volatileunsigned*)0x50008014)//UART2Rxerrorstatus#definerUFSTAT2(*(volatileunsigned*)0x50008018)//UART2FIFOstatus#definerUMSTAT2(*(volatileunsigned*)0x5000801c)//UART2Modemstatus#definerUBRDIV2(*(volatileunsigned*)0x50008028)//UART2Baudratedivisor#ifdef_BIG_ENDIAN#definerUTXH0(*(volatileunsignedchar*)0x50000023)//UART0TransmissionHold#definerURXH0(*(volatileunsignedchar*)0x50000027)//UART0Receivebuffer#definerUTXH1(*(volatileunsignedchar*)0x50004023)//UART1TransmissionHold#definerURXH1(*(volatileunsignedchar*)0x50004027)//UART1Receivebuffer#definerUTXH2(*(volatileunsignedchar*)0x50008023)//UART2TransmissionHold#definerURXH2(*(volatileunsignedchar*)0x50008027)//UART2Receivebuffer#defineWrUTXH0(ch)(*(volatileunsignedchar*)0x50000023)=(unsignedchar)(ch)#defineRdURXH0()(*(volatileunsignedchar*)0x50000027)#defineWrUTXH1(ch)(*(volatileunsignedchar*)0x50004023)=(unsignedchar)(ch)#defineRdURXH1()(*(volatileunsignedchar*)0x50004027)#defineWrUTXH20(ch)(*(volatileunsignedchar*)0x50008023)=(unsignedchar)(ch)#defineRdURXH2()(*(volatileunsignedchar*)0x50008027)#difineUTXH0(0x50000020+3)//Byte_accessaddressbyDMA#defineURXH0(0x50000024+3)#difineUTXH1(0x50004020+3)#defineURXH1(0x50004024+3)#difineUTXH2(0x50008020+3)#defineURXH2(0x50008024+3)#else//LittleEndian#definerUTXH0(*(volatileunsignedchar*)0x50000020)//UART0TransmissionHold#definerURXH0(*(volatileunsignedchar*)0x50000024)//UART0Receivebuffer#definerUTXH1(*(volatileunsignedchar*)0x50004020)//UART1TransmissionHold#definerURXH1(*(volatileunsignedchar*)0x50004024)//UART1Receivebuffer#definerUTXH2(*(volatileunsignedchar*)0x50000820)//UART2TransmissionHold#definerURXH2(*(volatileunsignedchar*)0x50008024)//UART2Receivebuffer#defineWrUTXH0(ch)(*(volatileunsignedchar*)0x50000020)=(unsignedchar)(ch)#defineRdURXH0()(*(volatileunsignedchar*)0x50000024)#defineWrUTXH1(ch)(*(volatileunsignedchar*)0x50004020)=(unsignedchar)(ch)#defineRdURXH1()(*(volatileunsignedchar*)0x50004024)#defineWrUTXH2(ch)(*(volatileunsignedchar*)0x50008020)=(unsignedchar)(ch)#defineRdURXH2()(*(volatileunsignedchar*)0x50008024)#difineUTXH0(0x50000020+3)//Byte_accessaddressbyDMA#defineURXH0(0x50000024+3)#difineUTXH1(0x50004020+3)#defineURXH1(0x50004024+3)#difineUTXH2(0x50008020+3)#defineURXH2(0x50008024+3)#endif6.3UART通訊程序編寫6.3.1通訊程序編寫步驟UART通訊程序可以采用查詢、中斷和DMA方式。我們經(jīng)過(guò)運(yùn)用較多的中斷方式來(lái)介UART通訊程序的編寫。簡(jiǎn)單做法是，UART通訊程序的編寫參照例子程序。?選通道，經(jīng)過(guò)函數(shù)Uart_Select()；選UART0~UART2；?選波特率和波特率發(fā)生器時(shí)鐘，選波特率經(jīng)過(guò)函數(shù)Uart_Pclk_En(intch,intbaud)或Uart_Pclk_En(intch,intbaud)來(lái)進(jìn)展。時(shí)鐘選UCLK，rUCON0|=0x400；時(shí)鐘選PCLK，rUCON0&=0x3ff。?通訊協(xié)議〔rULCON0〕設(shè)定，假設(shè)正常通訊，一位停頓位，8位數(shù)據(jù)位，無(wú)奇偶效驗(yàn)：rULCON0=(0<<6)|(0<<3)|(0<<2)|(3); ?通訊控制字〔rUCON0〕設(shè)定，如時(shí)鐘選ULK做波特率發(fā)生器；Tx中斷脈沖觸發(fā)，Rx中斷脈沖觸發(fā)；接納超時(shí)中斷允許；產(chǎn)生接納錯(cuò)誤中斷；正常方式發(fā)送：rUCON0|=(TX_INTTYPE<<9)|(RX_INTTYPE<<8)|(0<<7)|(0<<6)|(0<<5)|(0<<4)|(1<<2)|(1)；? I/O口初始化，由于UART通訊運(yùn)用H口的第二功能，所以H口要上拉制止：rGPHUP|=0x1ff。H口控制存放器nRTS1,nCTS1功能使能，rGPHCON&=0x3c0000，rGPHCON|=0x2faaa；? 設(shè)中斷效力函數(shù)入口地址，把中斷效力函數(shù)入口地址賦函數(shù)指針PISR_UARTn,留意，接納中斷效力函數(shù)入口地址和發(fā)送中斷效力函數(shù)入口地址是一個(gè)，在中斷效力函數(shù)中根據(jù)UTRSTATn[1]和UTRSTATn[0]形狀決議是發(fā)送中斷還是接納中斷。? 翻開總中斷屏蔽和子中斷屏蔽等待中斷：rINTMSK=~(BIT_UART0);rINTSUBMSK=~(BIT_SUB_TXD0);? 進(jìn)入中斷后，先屏蔽發(fā)送和接納中斷，防止新來(lái)中斷干擾我們的正常發(fā)送和接納，正常發(fā)送和接納終了后，清中斷掛起和中斷源掛起存放器：ClearPending(BIT_UART0)，rSUBSRCPND=(BIT_SUB_TXD0〔發(fā)送〕，rSUBSRCPND=(BIT_SUB_RXD0|BIT_SUB_ERR0)〔接納〕;? 取消中斷屏蔽，等下一次中斷。6.3.2通訊程序編寫例如下面給出的幾個(gè)函數(shù)，是查詢方式URAT通訊常用到的主要函數(shù)，包括URAT初始化，字符的發(fā)送、接納函數(shù)，希望大家仔細(xì)閱讀,了解每一行的含義。1,UART通訊，采用查詢方式：//援用頭文件#include"2410addr.h"#include"2410lib.h"#include"option.h"#include"def.h"#include<stdarg.h>#include<string.h>#include<stdlib.h>#include<stdio.h>#include<ctype.h>//函數(shù)聲明voidUart_Init(intpclk,intbaud);charUart_Getch(void);charUart_GetKey(void);voidUart_GetString(char*string);voidUart_SendByte(intdata);voidUart_SendString(char*pt);voidUart_Select(intch);//-----------------------------------------------------------------//串口初始化，輸入PCLK,輸入波特率//-----------------------------------------------------------------staticintwhichUart=0;voidUart_Init(intpclk,intbaud){inti;if(pclk==0)pclk=PCLK;rUFCON0=0x0;//UARTchannel0FIFOcontrolregister,FIFOdisablerUFCON1=0x0;//UARTchannel1FIFOcontrolregister,FIFOdisablerUFCON2=0x0;//UARTchannel2FIFOcontrolregister,FIFOdisablerUMCON0=0x0;//UARTchaneel0MODEMcontrolregister,AFCdisablerUMCON1=0x0;//UARTchaneel1MODEMcontrolregister,AFCdisable//UART0rULCON0=0x3;//Linecontrolregister:Normal,Noparity,1stop,8bits.//00000011rUCON0=0x245;//Controlregister//[10][9][8][7][6][5][4][3:2][1:0]//ClockSel,TxInt,RxInt,RxTimeOut,Rxerr,Loop-back,Sendbreak,TransmitMode,ReceiveMode01001000101//PCLK,LevelPulseDisableGenerateNormalNormalInterruptorPolling//rUBRDIV0=((int)(pclk/16./baud)-1);//Baudratedivisiorregister0rUBRDIV0=((int)(pclk/16./baud+0.5)-1);//Baudratedivisiorregister0

//UART1rULCON1=0x3;rUCON1=0x245;rUBRDIV1=((int)(pclk/16./baud)-1);//UART2rULCON2=0x3;rUCON2=0x245;rUBRDIV2=((int)(pclk/16./baud)-1);for(i=0;i<100;i++);}//-------------------------------------------------------------------------------//選擇串口通道//-------------------------------------------------------------------------------voidUart_Select(intch){whichUart=ch;}//------------------------------------------------------------------------//等待發(fā)送移位存放器空//------------------------------------------------------------------------voidUart_TxEmpty(intch){if(ch==0)while(!(rUTRSTAT0&0x4));//Waituntiltxshifterisempty.elseif(ch==1)while(!(rUTRSTAT1&0x4));//Waituntiltxshifterisempty.elseif(ch==2)while(!(rUTRSTAT2&0x4));//Waituntiltxshifterisempty.}//-----------------------------------------------------------------------------//接納串口一字節(jié)數(shù)據(jù)，留意RdURXH0()，RdURXH1()，RdURXH2()的運(yùn)用//-----------------------------------------------------------------------------charUart_Getch(void){if(whichUart==0){while(!(rUTRSTAT0&0x1));//ReceivedatareadyreturnRdURXH0();}elseif(whichUart==1){while(!(rUTRSTAT1&0x1));//ReceivedatareadyreturnRdURXH1();}elseif(whichUart==2){while(!(rUTRSTAT2&0x1));//ReceivedatareadyreturnRdURXH2();}elsereturn0;}//-------------------------------------------------------------------------------//得到串口的鍵值//-------------------------------------------------------------------------------charUart_GetKey(void){if(whichUart==0){if(rUTRSTAT0&0x1)//ReceivedatareadyreturnRdURXH0();elsereturn0;}elseif(whichUart==1){if(rUTRSTAT1&0x1)//ReceivedatareadyreturnRdURXH1();elsereturn0;}

elseif(whichUart==2){if(rUTRSTAT2&0x1)//ReceivedatareadyreturnRdURXH2();elsereturn0;}elsereturn0;}//-----------------------------------------------------------------------------//串口得到字符串//-----------------------------------------------------------------------------voidUart_GetString(char*string){char*string2=string;charc;while((c=Uart_Getch())!='\r'){if(c=='\b'){if((int)string2<(int)string){Uart_Printf("\b\b");string--;}}else{*string++=c;Uart_SendByte(c);}}*string='\0';Uart_SendByte('\n');}//---------------------------------------------------------------------//得到串口初始號(hào)//---------------------------------------------------------------------intUart_GetIntNum(void){charstr[30];char*string=str;intbase=10;intminus=0;intresult=0;intlastIndex;inti;Uart_GetString(string);if(string[0]=='-'){minus=1;string++;}

if(string[0]=='0'&&(string[1]=='x'||string[1]=='X')){base=16;string+=2;}

lastIndex=strlen(string)-1;

if(lastIndex<0)return-1;if(string[lastIndex]=='h'||string[lastIndex]=='H'){base=16;string[lastIndex]=0;lastIndex--;}if(base==10){result=atoi(string);result=minus?(-1*result):result;}else{for(i=0;i<=lastIndex;i++){if(isalpha(string[i])){if(isupper(string[i]))result=(result<<4)+string[i]-'A'+10;elseresult=(result<<4)+string[i]-'a'+10;}elseresult=(result<<4)+string[i]-'0';}result=minus?(-1*result):result;}returnresult;}//-----------------------------------------------------------------------------//串口發(fā)送字節(jié)//-----------------------------------------------------------------------------voidUart_SendByte(intdata){if(whichUart==0)

{if(data=='\n'){while(!(rUTRSTAT0&0x2));Delay(10);//becausetheslowresponseofhyper_terminalWrUTXH0('\r');}while(!(rUTRSTAT0&0x2));//WaituntilTHRisempty.Delay(10);WrUTXH0(data);}elseif(whichUart==1){if(data=='\n')

{while(!(rUTRSTAT1&0x2));Delay(10);//becausetheslowresponseofhyper_terminalrUTXH1='\r';}while(!(rUTRSTAT1&0x2));//WaituntilTHRisempty.Delay(10);rUTXH1=data;}elseif(whichUart==2){if(data=='\n')

{while(!(rUTRSTAT2&0x2));Delay(10);//becausetheslowresponseofhyper_terminalrUTXH2='\r';}while(!(rUTRSTAT2&0x2));//WaituntilTHRisempty.Delay(10);rUTXH2=data;}}//-----------------------------------------------------------------------------//串口發(fā)送字符串//-----------------------------------------------------------------------------voidUart_SendString(char*pt){while(*pt)Uart_SendByte(*pt++);}2，UART0中斷方式發(fā)送和接納//-----------------------------------------------------------------------------//UART0中斷方式發(fā)送和接納//-----------------------------------------------------------------------------voidTest_Uart0_Int(void){Uart_Port_Set();Uart_Select(0);/*UART0Txtestwithinterrupt*/isTxInt=1;uart0TxStr="ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890->UART0Txinterrupttestisgood!!!!\r\n";Uart_Printf("[Uartchannel0TxInterruptTest]\n");pISR_UART0=(unsigned)Uart0_TxInt;rULCON0=(0<<6)|(0<<3)|(0<<2)|(3); //Normal,Noparity,Onestopbit,8bitrUCON0&=0x400; //ForthePCLK<->UCLKfuctionrUCON0|=(TX_INTTYPE<<9)|(RX_INTTYPE<<8)|(0<<7)|(0<<6)|(0<<5)|(0<<4)|(1<<2)|(1);//Clock,Tx:Def,Rx:Def,Rxtimeout:x,Rxerrorint:x,Loop-back:x,Sendbreak:x,Tx:int,Rx:intUart_TxEmpty(0);//waituntiltxbufferisempty.rINTMSK=~(BIT_UART0);rINTSUBMSK=~(BIT_SUB_TXD0);while(isTxInt);/*UART0Rxtestwithinterrupt*/isRxInt=1;uart0RxStr=(char*)UARTBUFFER;Uart_Printf("\n[Uartchannel0RxInterruptTest]:\n");Uart_Printf("AftertypingENTERkey,youwillseethecharacterswhichwastypedbyyou.");Uart_Printf("\nToquit,pressENTERkey.!!!\n");Uart_TxEmpty(0);//waituntiltxbufferisempty.pISR_UART0=(unsigned)Uart0_RxIntOrErr;rULCON0=(0<<6)|(0<<3)|(0<<2)|(3); //Normal,Noparity,Onestopbit,8bitrUCON0&=0x400; //ForthePCLK<->UCLKfuctionrUCON0|=(TX_INTTYPE<<9)|(RX_INTTYPE<<8)|(0<<7)|(1<<6)|(0<<5)|(0<<4)|(1<<2)|(1);//Clock,Tx:pulse,Rx:pulse,Rx:timeout:x,Rx,errorint:o,Loop-back:x,Sendbreak:x,Tx:int,Rx:int//ClearIntPendingandUnmaskClearPending(BIT_UART0);rINTMSK=~(BIT_UART0);rSUBSRCPND=(BIT_SUB_TXD0|BIT_SUB_RXD0|BIT_SUB_ERR0);rINTSUBMSK=~(BIT_SUB_RXD0|BIT_SUB_ERR0);

while(isRxInt);

rINTSUBMSK|=(BIT_SUB_RXD0|BIT_SUB_ERR0);rINTMSK|=(BIT_UART0);

Uart_Printf("%s\n",(char*)UARTBUFFER);Uart_Port_Return();}//--------------------------------------------------------------------------//UART發(fā)送和接納用到的I/O口保管和初始化//--------------------------------------------------------------------------voidUart_Port_Set(void){//PushUARTGPIOportconfigurationsave_rGPHCON=rGPHCON;save_rGPHDAT=rGPHDAT;save_rGPHUP=rGPHUP;//ConfigureUARTportrGPHCON&=0x3c0000;rGPHCON|=0x2faaa; //nRTS1,nCTS1rGPHUP|=0x1ff; //Uartportpull-updisable//rINTSUBMSK=0x7ff;//SUBINTALLMASK//PushUartcontrolregisterssave_ULCON0=rULCON0; save_UCON0=rUCON0; save_UFCON0=rUFCON0; save_UMCON0=rUMCON0; save_ULCON1=rULCON1; save_UCON1=rUCON1; save_UFCON1=rUFCON1; save_UMCON1=rUMCON1; save_ULCON2=rULCON2; save_UCON2=rUCON2; save_UFCON2=rUFCON2; save_UMCON2=rUMCON2; //InitializeUART1,2port}//-----------------------------------------------------------------------------//UART發(fā)送和接納終了，用到的I/O口恢復(fù)原來(lái)形狀//-----------------------------------------------------------------------------voidUart_Port_Return(void){//PopUARTGPIOportconfigurationrGPHCON=save_rGPHCON;rGPHDAT=save_rGPHDAT;rGPHUP=save_rGPHUP;//PopUartcontrolregistersrULCON0=save_ULCON0; rUCON0=save_UCON0; rUFCON0=save_UFCON0; rUMCON0=save_UMCON0; rULCON1=save_ULCON1; rUCON1=save_UCON1; rUFCON1=save_UFCON1; rUMCON1=save_UMCON1;rULCON2=save_ULCON2; rUCON2=save_UCON2; rUFCON2=save_UFCON2; rUMCON2=save_UMCON2; }//-------------------------------------------------------------------//UART發(fā)送和接納運(yùn)用UCLK，并計(jì)算rUBRDIV0和設(shè)定波特率//-------------------------------------------------------------------voidUart_Uclk_En(intch,intbaud){/*intch,baud;Uart_Printf("\nSelectUARTchannel[0:UART0/1:UART1/2:UART2]:\n");ch=Uart_GetIntNum();Uart_Printf("\nSelectbaudrate:\n");baud=Uart_GetIntNum();*/if(ch==0){ Uart_Select(0); rUCON0|=0x400; //SelectUCLK rUBRDIV0=((int)(UCLK/16./baud)-1); //Baudratedivisiorregister Uart_Printf("UCLKisenabledbyUART0.\n"); }elseif(ch==1){ Uart_Select(1); rUCON1|=0x400; //SelectUCLKrUBRDIV1=((int)(UCLK/16./baud)-1); //BaudratedivisiorregisterUart_Select(0);Uart_Printf("UCLKisenabledbyUART1.\n"); }else{ Uart_Select(2); rUCON2|=0x400; //SelectUCLKrUBRDIV2=((int)(UCLK/16./baud)-1); //BaudratedivisiorregisterUart_Select(0);Uart_Printf("UCLKisenabledbyUART2.\n"); }//for(i=0;i<100;i++); //Forthesatbleoperation}//----------------------------------------------------------------------------//UART發(fā)送和接納運(yùn)用PCLK，并計(jì)算rUBRDIV0和設(shè)定波特率//----------------------------------------------------------------------------voidUart_Pclk_En(intch,intbaud){/*intch,baud;Uart_Printf("\nSelectUARTchannel[0:UART0/1:UART1/2:UART2]:\n");ch=Uart_GetIntNum();Uart_Printf("\nSelectbaudrate:\n");baud=Uart_GetIntNum();*/if(ch==0){ Uart_Select(0); rUCON0&=0x3ff; //SelectPCLK rUBRDIV0=((int)(PCLK/16./baud)-1); //Baudratedivisiorregister Uart_Printf("PCLKisenabledbyUART0.\n"); }elseif(ch==1){ Uart_Select(1); rUCON1|=0x3ff; //SelectPCLK rUBRDIV1=((int)(PCLK/16./baud)-1); //Baudratedivisiorregister Uart_Select(0); Uart_Printf("PCLKisenabledbyUART1.\n"); }else{ Uart_Select(2); rUCON2|=0x3ff; //SelectPCLK rUBRDIV2=((int)(PCLK/16./baud)-1); //Baudratedivisiorregister Uart_Select(0); Uart_Printf("PCLKisenabledbyUART2.\n"); }//for(i=0;i<100;i++); //Forthesatbleoperation}//-----------------------------------