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1、,*,單擊此處編輯母版標題樣式,單擊此處編輯母版文本樣式,第二級,第三級,第四級,第五級,第六章,S3C2410,的串口,UART,及編程,6.1 S3C2410,的串口,UART,概述,6.1.1 S3C2410,異步串行通信（,UART,）單元,S3C2410 UART,單元提供,3,個獨立的異步串行通信接口，皆可工作于查詢、中斷和,DMA,模式。使用系統(tǒng)時鐘最高波特率達,230. 4 kb/s,，如果使用外部設備提供的時鐘，可以達到更高的速率。每一個,UART,單元包含一個,16,字節(jié)的,FIFO,（,First Input First Output,，先進先出移位寄存器），用于數(shù)據(jù)的接

2、收和發(fā)送。,S3C2410 UART,支持可編程波特率、紅外發(fā)送,/,接收,( UART2 ),、,1,個或,2,個停止位、,5,位,/6,位,/7,位,/8,位數(shù)據(jù)寬度和奇偶校驗。,6.1.2,波特率的產生,波特率由一個專用的,UART,波特率分頻寄存器,(,UBRDIVn,),控制，,UBRDIVn,值計算公,如下：,UBRDIVn=,(,int,)ULK/(,波特率, 16),1,或者,UBRDIVn=,(,int,) PLK/(,波特率, 16),1,式中：時鐘選用,ULK,還是,PLK,由,UART,控制寄存器,UCONn10,的狀態(tài)決定。如果,UCONn10=0,，則用,PLK,作

3、為波特率發(fā)生器的時鐘源頻率；否則選用,ULK,作為波特率發(fā)生器的時鐘源頻率。,UBRDIVn,的值必須在,1(216,1),之間。,例如,:,若,ULK,或者,PLK,等于,40 MHz,，當波特率為,115200 b/s,時，則,UBRDIVn=,(int)40 000 000/(115 200 16),一,1=int(21. 7),1= 21,1=20,6.1.3 UART,通信操作,下面簡略介紹,UART,操作，關于數(shù)據(jù)發(fā)送、數(shù)據(jù)接收、中斷產生、波特率產生、查詢檢測模式、紅外模式的詳細介紹，參見下面,6.3,節(jié)。,發(fā)送數(shù)據(jù)幀是可編程的。一個數(shù)據(jù)幀包含,1,個起始位、,58,個數(shù)據(jù)位、,1

4、,個可選的奇偶校驗位和,12,位停止位，停止位通過行控制寄存器,ULCONn,配置。,與發(fā)送數(shù)據(jù)幀類似，接收數(shù)據(jù)幀也是可編程的。接收幀由,1,個起始位、,58,個數(shù)據(jù)位、,l,個可選的奇偶校驗位以及,12,位行控制寄存器,ULCONn,中設定的停止位組成。接收器還可以檢測溢出錯、奇偶校驗錯、幀錯誤和傳輸中斷，每一個錯誤均可以設置一個錯誤標志。,溢出錯誤,(overrun error),：指已接收到的數(shù)據(jù)在讀取之前被新接收的數(shù)據(jù)覆蓋；,奇偶校驗錯：指接收器檢測到的校驗和與設置的不符；,幀錯誤：指沒有接收到有效的停止位；,傳輸中斷：表示接收數(shù)據(jù),RxDn,保持邏輯,0,超過一幀的傳輸時間。,在,F

5、IFO,模式下，如果,RxFIFO,非空，而在,3,個字的傳輸時間內沒有接受到數(shù)據(jù)，則產生超時。,6.2 UART,的控制寄存器,6.2.1 UART,行控制寄存器,ULCONn,該寄存器的位,6,決定是否使用紅外模式，位,5,、位,4,和位,3,決定校驗方式，位,2,決定停止位長度，位,1,和位,0,決定每幀的數(shù)據(jù)位數(shù)。具體如下：,ULCONn7,保留；,ULCONn6,紅外線模式，,0,：正常模式；,1,：紅外線模式；,ULCONn5,：,3,校驗模式，,0xx,：無校驗；,100,：奇校驗；,101,：偶校驗；,ULCONn2,停止位，,0,：一個停止位；,1,：二個停止位；,ULCON

6、n1,：,0,數(shù)據(jù)位，,00,：,5,位；,01,：,6,位；,10,：,7,位；,11,：,8,位。,6.2.2 UART,控制寄存器,UCONn,該寄存器決定,UART,的各種模式。,UCONn10 1,：,ULK,做波特率發(fā)生器；,0,：,PLK,做波特率發(fā)生器。,UCONn9 1,：,Tx,中斷電平觸發(fā)；,0,：,Tx,中斷脈沖觸發(fā)。,UCONn8 1,：,Rx,中斷電平觸發(fā)；,0,：,Rx,中斷脈沖觸發(fā)。,UCONn7 1,：接收超時中斷允許；,0,：接收超時中斷禁止。,UCONn6 1,：產生接收錯誤中斷；,0,：不產生接收錯誤中斷。,UCONn5 l,：發(fā)送直接傳給接收方式,(l

7、oopback),；,0,：正常模式。,UCONn4 1,：發(fā)送間斷信號；,0,：正常模式發(fā)送。,UCONn,3:2,發(fā)送模式選擇：,00,：禁止發(fā)送；,01,：中斷或查詢模式；,10,：,DMA0,請求,(UART0 ),，,DMA3,請求,(UART2),；,11,：,DMAl,請求,(UART1),。,UCONn,1,：,0,接收模式選擇。,00,：禁止接收；,01,：中斷或查詢模式；,10,：,DMA0,請求,UART0,，,DMA2,請求,UART2,；,11,：,DMAl,請求,UART1,。,6.2.3 UART FIFO,控制寄存器,UFCONn,UFCONn7:6,00,：,

8、Tx,FIFO,寄存器中有,0,字節(jié)就觸發(fā)中斷；,01,：,Tx,FIFO,寄存器中有,4,字節(jié)就觸發(fā)中斷；,10,：,Tx,FIFO,寄存器中有,8,字節(jié)就觸發(fā)中斷；,11,：,Tx,FIFO,寄存器中有,12,字節(jié)就觸發(fā)中斷。,UFCONn5:4,00,：,Rx FIFO,寄存器中有,4,字節(jié)就觸發(fā)中斷；,01,：,Rx FIFO,寄存器中有,8,字節(jié)就觸發(fā)中斷；,10,：,Rx FIFO,寄存器中有,12,字節(jié)就觸發(fā)中斷；,11,：,Rx FIFO,寄存器中有,16,字節(jié)就觸發(fā)中斷。,UFCONn,3,保留。,UFCONn,2 1,：,FIFO,復位清零,Tx,FIFO,；,0,：,FI

9、FO,復位不清零,TxFIFO,。,UFCONn,1 1: FIFO,復位清零,Rx FIFO,；,0,：,F1FO,復位不清零,RxFIFO,。,UFCONn,0 1,：允許,FIFO,功能；,0,：禁止,FIFO,功能。,6.2.4 UART MODEM,控制寄存器,UMCONn,UMCONn,7,：,5,保留，必須全為,0,。,UMCONn,4 1,：允許使用,AFC,模式；,0,：禁止使用,AFC,模式。,UMCONn,3,保留，必須全為,0,。,UMCONn0 1,：激活,rRTS,；,0,：不激活,rRTS,。,6.2.5,發(fā)送寄存器,UTXH,和接收寄存器,URXH,這兩個寄存器

10、存放發(fā)送和接收的數(shù)據(jù)，當然只有,1,字節(jié),(8,位數(shù)據(jù),),。需要注意的是，在發(fā)生溢出錯誤時，接收的數(shù)據(jù)必須被讀出來，否則會引發(fā)下次溢出錯誤。,6.2.6,發(fā)送和接收狀態(tài)寄存器,UTRSTATn,UTRSTATn,發(fā)送和接收狀態(tài)寄存器包括,UTRSTAT0, UTRSTAT1 and UTRSTAT2,UTRSTATn,寄存器各位定義：,UTRSTATn,1,發(fā)送緩沖器空標志,0 =,不空；,1 =,空。,UTRSTATn,0,接收緩沖器有接收數(shù)據(jù)標志,0 =,空；,1 =,接收緩沖器有數(shù)據(jù)。,6.2.7,波特率分頻寄存器,UBRDIV,波特率分頻寄存器,UBRDIV,的定義和使用在,6.1.

11、2,中已敘述，不再重復。,6.2.8 UART,單元各寄存器的定義,在隨書提供的軟件包,2410test,中，在,2410addr.h,文件中有關于,UART,單元各寄存器的定義。,/UART,#define rULCON0 ( * (volatile unsigned * )0x50000000)/UART 0 Line control,#define rUCON0 ( * (volatile unsigned * )0x50000004)/UART 0 control,#define rUFCON0 ( * (volatile unsigned * )0x50000008)/UART 0

12、FIFO control,#define rUMCON0 ( * (volatile unsigned * )0x5000000c)/UART 0 Modem control,#define rUTRSTAT0 ( * (volatile unsigned * )0x50000010)/UART 0,Tx,/Rx status,#define rUERSTAT0 ( * (volatile unsigned * )0x50000014)/UART 0 Rx error status,#define rUFSTAT0 ( * (volatile unsigned * )0x50000018)/U

13、ART 0 FIFO status,#define,rUMSTAT0 ( * (volatile unsigned * )0x5000001c)/UART 0 Modem status,#define,rUBRDIV0 ( * (volatile unsigned * )0x50000028)/UART 0 Baud rate,diviaor,#define,rULCON1 ( * (volatile unsigned * )0x50004000)/UART 1 Line control,#define,rUCON1 ( * (volatile unsigned * )0x50004004)/

14、UART 1 Control,#define,rUFCON1 ( * (volatile unsigned * )0x50004008)/UART 1 FIFO control,#define,rUMCON1 ( * (volatile unsigned * )0x5000400c)/UART 1 Modem control,#define,rUTRSTAT1 ( * (volatile unsigned * )0x50004010)/UART 1,Tx,/Rx status,#define,rUERSTAT1 ( * (volatile unsigned * )0x50004014)/UAR

15、T 1 Rx error status,#define rUFSTAT1 ( * (volatile unsigned * )0x50004018)/UART 1 FIFO status,#define rUMSTAT1 ( * (volatile unsigned * )0x5000401c)/UART 1 Modem status,#define rUBRDIV1 ( * (volatile unsigned * )0x50004028)/UART 1 Baud rate divisor,#define rULCON2 ( * (volatile unsigned * )0x5000800

16、0)/UART 2 Line control,#define rUCON2 ( * (volatile unsigned * )0x50008004)/UART 2 Control,#define rUFCON2( * (volatile unsigned * )0x50008008)/UART 2 FIFO control,#define rUMCON2 ( * (volatile unsigned * )0x5000800c)/UART 2 Modem control,#define rUTRSTAT2 ( * (volatile unsigned * )0x50008010)/UART

17、2,Tx,/Rx status,#define rUERSTAT2 ( * (volatile unsigned * )0x50008014)/UART 2 Rx error status,#define rUFSTAT2 ( * (volatile unsigned * )0x50008018)/UART 2 FIFO status,#define rUMSTAT2 ( * (volatile unsigned * )0x5000801c)/UART 2 Modem status,#define rUBRDIV2 ( * (volatile unsigned * )0x50008028)/U

18、ART 2 Baud rate divisor,#ifdef_BIG_ENDIAN,#define,rUTXH0 ( * (volatile unsigned char * )0x50000023)/UART 0 Transmission Hold,#define,rURXH0 ( * (volatile unsigned char * )0x50000027)/UART 0 Receive buffer,#define,rUTXH1 ( * (volatile unsigned char * )0x50004023)/UART 1 Transmission Hold,#define,rURX

19、H1 ( * (volatile unsigned char * )0x50004027)/UART 1 Receive buffer,#define,rUTXH2 ( * (volatile unsigned char * )0x50008023)/UART 2 Transmission Hold,#define rURXH2 ( * (volatile unsigned char * )0x50008027)/UART 2 Receive buffer,#define WrUTXH0(ch) ( * (volatile unsigned char * )0x50000023)=(unsig

20、ned char)(,ch,),#define RdURXH0() ( * (volatile unsigned char * )0x50000027),#define WrUTXH1(ch) ( * (volatile unsigned char * )0x50004023)=(unsigned char)(,ch,),#define RdURXH1() ( * (volatile unsigned char * )0x50004027),#define WrUTXH20(ch) ( * (volatile unsigned char * )0x50008023)=(unsigned cha

21、r)(,ch,),#define RdURXH2() ( * (volatile unsigned char * )0x50008027),#difine,UTXH0 (0x50000020+3) /,Byte_access,address by DMA,#define URXH0 (0x50000024+3),#difine,UTXH1 (0x50004020+3),#define URXH1 (0x50004024+3),#difine,UTXH2 (0x50008020+3 ),#define URXH2 (0x50008024+3),#else/Little,Endian,#defin

22、e rUTXH0 ( * (volatile unsigned char * )0x50000020)/UART 0 Transmission Hold,#define rURXH0 ( * (volatile unsigned char * )0x50000024)/UART 0 Receive buffer,#define rUTXH1 ( * (volatile unsigned char * )0x50004020)/UART 1 Transmission Hold,#define rURXH1 ( * (volatile unsigned char * )0x50004024)/UA

23、RT 1 Receive buffer,#define rUTXH2 ( * (volatile unsigned char * )0x50000820)/UART 2 Transmission Hold,#define,rURXH2 ( * (volatile unsigned char * )0x50008024)/UART 2 Receive buffer,#define,WrUTXH0(,ch,) ( * (volatile unsigned char * )0x50000020)=(unsigned char)(,ch,),#define,RdURXH0() ( * (volatil

24、e unsigned char * )0x50000024),#define,WrUTXH1(ch) ( * (volatile unsigned char * )0x50004020)=(unsigned char)(,ch,),#define RdURXH1() ( * (volatile unsigned char * )0x50004024),#define WrUTXH2(ch) ( * (volatile unsigned char * )0x50008020)=(unsigned char)(,ch,),#define RdURXH2() ( * (volatile unsign

25、ed char * )0x50008024),#difine,UTXH0 (0x50000020+3) /,Byte_access,address by DMA,#define,URXH0 (0x50000024+3),#difine,UTXH1 (0x50004020+3),#define,URXH1 (0x50004024+3),#difine,UTXH2 (0x50008020+3 ),#define,URXH2 (0x50008024+3),#endif,6.3 UART,通信程序編寫,6.3.1,通信程序編寫步驟,UART,通信程序可以采用查詢、中斷和,DMA,模式。我們通過使用較多

26、的中斷方式來介,UART,通信程序的編寫。簡單做法是，,UART,通信程序的編寫參照例子程序。,選通道，通過函數(shù),Uart_Select,(),；選,UART0UART2,；,選波特率和波特率發(fā)生器時鐘，選波特率通過函數(shù),Uart_Pclk_En,(,int,ch,int,baud),或,Uart_Pclk_En,(,int,ch,int,baud),來進行。時鐘選,UCLK,，,rUCON0|=0x400,；時鐘選,PCLK,，,rUCON0&=0x3ff,。,通信協(xié)議（,rULCON0,）設定，如果正常通信，一位停止位，,8,位數(shù)據(jù)位，無奇偶效驗：,rULCON0=(06)|(03)|(0

27、2)|(3);,通信控制字（,rUCON0,）設定，如時鐘選,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)；接收超時中斷允許；產生接收錯誤中斷；正常模式發(fā)送：,rUCON0|= (TX_INTTYPE9)|(RX_INTTYPE8)|(07)|(06)|(05)|(04)|(12)|(1),；, I/O,口初始化，因為,UART,通信使用,H,口的第二功能，所以,H,口要上拉禁止：,rGPHUP|=0x1ff,。,H,口控制寄存器,nRTS1,nCTS1,功能使能，,rGPHCON&=0x3c0000,，,rGPHCON|=0x2faaa,；,設中斷服務函數(shù)入口地址，把中

28、斷服務函數(shù)入口地址賦函數(shù)指針,PISR_UARTn,注意，接收中斷服務函數(shù)入口地址和發(fā)送中斷服務函數(shù)入口地址是一個，在中斷服務函數(shù)中根據(jù),UTRSTATn,1,和,UTRSTATn,0,狀態(tài)決定是發(fā)送中斷還是接收中斷。,打開總中斷屏蔽和子中斷屏蔽等待中斷：,rINTMSK=,(BIT_UART0);,rINTSUBMSK=,(BIT_SUB_TXD0);,進入中斷后，先屏蔽發(fā)送和接收中斷，防止新來中斷干擾我們的正常發(fā)送和接收，正常發(fā)送和接收結束后，清中斷掛起和中斷源掛起寄存器：,ClearPending(BIT_UART0),，,rSUBSRCPND=,(BIT_SUB_TXD0,（發(fā)送），,

29、rSUBSRCPND=,(BIT_SUB_RXD0|BIT_SUB_ERR0),（接收）,;,取消中斷屏蔽，等下一次中斷。,6.3.2,通信程序編寫示例,下面給出的幾個函數(shù)，是查詢方式,URAT,通信常用到的主要函數(shù)，包括,URAT,初始化，字符的發(fā)送、接收函數(shù)，希望大家仔細閱讀,理解每一行的含義。,1, UART,通信，采用查詢方式：,/,引用頭文件,#include 2410addr.h,#include 2410lib.h,#include ,option.h,#include ,def.h,#include ,#include ,#include ,#include ,#include

30、 ,/,函數(shù)聲明,void,Uart_Init,(,int,pclk,int,baud);,char,Uart_Getch,(void);,char,Uart_GetKey,(void);,void,Uart_GetString,(char *string);,void,Uart_SendByte,(,int,data);,void,Uart_SendString,(char *pt);,void,Uart_Select,(,int,ch,);,/-,/,串口初始化，輸入,PCLK,輸入波特率,/-,static,int,whichUart=0;,void,Uart_Init,(,int,pc

31、lk,int,baud),int,i;,if(,pclk,= 0),pclk,= PCLK;,rUFCON0 = 0x0; /UART channel 0 FIFO control register, FIFO disable,rUFCON1 = 0x0; /UART channel 1 FIFO control register, FIFO disable,rUFCON2 = 0x0; /UART channel 2 FIFO control register, FIFO disable,rUMCON0 = 0x0; /UART,chaneel,0 MODEM control registe

32、r, AFC disable,rUMCON1 = 0x0; /UART,chaneel,1 MODEM control register, AFC disable,/UART0,rULCON0 = 0x3;,/Line control register :,Normal,No,parity,1 stop,8 bits.,/ 0 0 0 0 0 0 1 1,rUCON0 = 0x245; / Control register,/ 10 9 8 7 6 5 4 3:2 1:0,/ Clock,Sel,Tx,Int, Rx,Int, Rx Time Out, Rx err, Loop-back, S

33、end break, Transmit Mode, Receive Mode,0 1 0 0 1 0 0 0 1 0 1,/ PCLK ,Level Pulse Disable Generate Normal,Normal,Interrupt or Polling,/ rUBRDIV0=( (int)(pclk/16./baud) -1 ); /Baud rate,divisior,register 0,rUBRDIV0=( (int)(pclk/16./baud+0.5) -1 ); /Baud rate,divisior,register 0,/UART1,rULCON1 = 0x3;,r

34、UCON1 = 0x245;,rUBRDIV1=( (,int,)(pclk/16./baud) -1 );,/UART2,rULCON2 = 0x3;,rUCON2 = 0x245;,rUBRDIV2=( (,int,)(pclk/16./baud) -1 );,for(i=0;i100;i+);,/-,/,選擇串口通道,/-,void,Uart_Select,(,int,ch,),whichUart,=,ch,;,/-,/,等待發(fā)送移位寄存器空,/-,void,Uart_TxEmpty,(,int,ch,),if(ch=0),while(!(rUTRSTAT0 /Wait until,tx

35、,shifter is empty.,else if(ch=1),while(!(rUTRSTAT1 /Wait until,tx,shifter is empty.,else if(ch=2),while(!(rUTRSTAT2 /Wait until,tx,shifter is empty.,/-,/,接收串口一字節(jié)數(shù)據(jù)，注意,RdURXH0(),，,RdURXH1(),，,RdURXH2(),的使用,/-,char,Uart_Getch,(void),if(whichUart=0),while(!(rUTRSTAT0 /Receive data ready,return RdURXH0(

36、);,else if(whichUart=1), while(!(rUTRSTAT1 /Receive data ready,return RdURXH1();,else if(whichUart=2), while(!(rUTRSTAT2 /Receive data ready,return RdURXH2();,else,return 0;,/-/,得到串口的鍵值,/-,char,Uart_GetKey,(void),if(whichUart=0),if(rUTRSTAT0 & 0x1) /Receive data ready,return RdURXH0();,else,return 0

37、;,else if(whichUart=1),if(rUTRSTAT1 & 0x1) /Receive data ready,return RdURXH1();,else,return 0;,else if(whichUart=2),if(rUTRSTAT2 & 0x1) /Receive data ready,return RdURXH2();,else,return 0;,else,return 0;,/-,/,串口得到字符串,/-,void,Uart_GetString,(char *string),char *string2 = string;,char c;,while(c =,Ua

38、rt_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,/-,int,Uart_GetIntNum,(void),char str30;,char *string =,str,;,int,base = 10;,int,minus = 0;,int,result = 0;,int,lastIndex,;,int,i;,U

39、art_GetString,(string);,if(string0=-),minus = 1;,string+,;,if(string0=0 & (string1=x | string1=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 =,at

40、oi,(string);,result = minus ? (-1*result):result;,else,for(i=0;i,=lastIndex;i+,),if(,isalpha,(stringi),if(,isupper,(stringi),result = (result4) + stringi - A + 10;,else,result = (result4) + stringi - a + 10;,else,result = (resultUART0,Tx,interrupt test is,good!rn,;,Uart_Printf,(,Uart,channel 0,Tx,In

41、terrupt Testn);,pISR_UART0=(unsigned)Uart0_TxInt;,rULCON0=(06)|(03)|(02)|(3);/,Normal,No,parity,One,stop bit, 8bit,rUCON0 / For the PCLK UCLK,fuction,rUCON0|= (TX_INTTYPE9)|(RX_INTTYPE8)|(07)|(06)|(05)|(04)|(12)|(1);,/,Clock,Tx:Def,Rx:Def,Rx,timeout:x,Rxerror,int:x,Loop-back:x,Send,break:x,Tx:int,Rx

42、:int,Uart_TxEmpty(0); /wait until,tx,buffer is empty.,rINTMSK=,(BIT_UART0);,rINTSUBMSK=,(BIT_SUB_TXD0);,while(,isTxInt,);,/* UART0 Rx test with interrupt */,isRxInt=1;,uart0RxStr=(char *)UARTBUFFER;,Uart_Printf,(n,Uart,channel 0 Rx Interrupt Test:n);,Uart_Printf,(After typing ENTER key, you will see

43、 the characters which was typed by you.);,Uart_Printf,(,nTo,quit, press ENTER key.!n);,Uart_TxEmpty(0); /wait until,tx,buffer is empty.,pISR_UART0 =(unsigned)Uart0_RxIntOrErr;,rULCON0=(06)|(03)|(02)|(3);/,Normal,No,parity,One,stop bit, 8bit,rUCON0 / For the PCLK UCLK,fuction,rUCON0|= (TX_INTTYPE9)|(

44、RX_INTTYPE8)|(07)|(16)|(05)|(04)|(12)|(1);,/,Clock,Tx:pulse,Rx:pulse,Rx:timeout:x,Rx,errorint:o,Loop-back:x,Sendbreak:x,Tx:int,Rx:int,/ Clear,Int,Pending and Unmask,ClearPending(BIT_UART0);,rINTMSK=,(BIT_UART0);,rSUBSRCPND=,(BIT_SUB_TXD0|BIT_SUB_RXD0|BIT_SUB_ERR0);,rINTSUBMSK=,(BIT_SUB_RXD0|BIT_SUB_

45、ERR0);,while(,isRxInt,);,rINTSUBMSK|=,(BIT_SUB_RXD0|BIT_SUB_ERR0);,rINTMSK|=,(BIT_UART0);,Uart_Printf,(,%sn,(char *)UARTBUFFER);,Uart_Port_Return,();,/-,/UART,發(fā)送和接收用到的,I/O,口保存和初始化,/-,void,Uart_Port_Set,(void),/Push UART GPIO port configuration,save_rGPHCON=rGPHCON,;,save_rGPHDAT=rGPHDAT,;,save_rGPHU

46、P=rGPHUP,;,/Configure UART port,rGPHCON,rGPHCON|=0x2faaa;/ nRTS1,nCTS1,rGPHUP|=0x1ff;/,Uart,port pull-up disable,/rINTSUBMSK=0x7ff; /SUBINT ALL MASK,/Push,Uart,control registers,save_ULCON0=rULCON0;,save_UCON0=rUCON0;,save_UFCON0=rUFCON0;,save_UMCON0=rUMCON0;,save_ULCON1=rULCON1;,save_UCON1 =rUCON1;

47、,save_UFCON1=rUFCON1;,save_UMCON1=rUMCON1;,save_ULCON2=rULCON2;,save_UCON2 =rUCON2;,save_UFCON2=rUFCON2;,save_UMCON2=rUMCON2;,/Initialize UART1,2 port,/-,/ UART,發(fā)送和接收結束，用到的,I/O,口恢復原來狀態(tài),/-,void Uart_Port_Return(void),/Pop UART GPIO port configuration,rGPHCON=save_rGPHCON;,rGPHDAT=save_rGPHDAT;,rGPHUP

48、=save_rGPHUP;,/Pop,Uart,control registers,rULCON0=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

49、,發(fā)送和接收使用,UCLK,，并計算,rUBRDIV0,和設定波特率,/-,void,Uart_Uclk_En,(,int,ch,int,baud),/*,int,ch, baud;,Uart_Printf,(,nSelect,UART channel0:UART0/1:UART1/2:UART2:n);,ch=Uart_GetIntNum,();,Uart_Printf,(,nSelect,baud rate :n);,baud=Uart_GetIntNum,();,*/,if(,ch,= 0) ,Uart_Select(0);,rUCON0|=0x400;/ Select UCLK,rUB

50、RDIV0=( (int)(UCLK/16./baud) -1 );/Baud rate,divisior,register,Uart_Printf,(UCLK is enabled by UART0.n);,else if(ch=1),Uart_Select(1);,rUCON1|=0x400;/ Select UCLK,rUBRDIV1=( (int)(UCLK/16./baud) -1 );/Baud rate,divisior,register,Uart_Select(0);,Uart_Printf,(UCLK is enabled by UART1.n);,else ,Uart_Select(2);,rUCON2|=0x400;/ Select UCLK,rUBRDIV2=( (int)(UCLK/16./baud) -1 );/Baud rate,divisior,register,Uart_Select(0);,Uart_Printf,(UCLK is enabled by UART2.n);,/for(i=0;i100;i+);/ For the,satble,operation,/-,/ UART,發(fā)送和接收使用,PCLK,