c语言串口通信范例

1、一个 c 语言的串口通信程序范例标签： 分类： 技术笔记c 语言串口通信通信程序it最近接触一个项目，用 HL-C1C激光位移传感器+易控组态软件完成生产线高度跳变检测，好久没有接触c c# ，一些资料，找来做个记录，也许大家用的着#include <stdio.h>#include <dos.h>#include <conio.h>#include <string.h>#define COM2320x2f8#define COMINT0x0b#define MaxBufLen500#define Port82590x20#define EofI

2、nt0x20static int comportaddr;static char intvectnum;static unsigned char maskb;static unsigned char BufferMaxBufLen;static int CharsInBuf,CircIn,CircOut;static void (interrupt far *OldAsyncInt)();static void interrupt far AsyncInt(void);void Init_COM(int ComPortAddr, unsigned char IntVectNum, int Ba

3、ud,unsigned char Data, unsigned char Stop, unsigned char Parity)unsigned char High,Low;int f;comportaddr=ComPortAddr;intvectnum=IntVectNum;CharsInBuf=0;CircIn=0;CircOut=0;f=(Baud/100);f=1152/f; High=f/256;Low=f-High*256;outp(ComPortAddr+3,0x80);outp(ComPortAddr,Low);outp(ComPortAddr+1,High);Data=(Da

4、ta-5)|(Stop-1)*4);if(Parity=2) Data=Data|0x18;else if(Parity=1) Data=Data|0x8;outp(ComPortAddr+3,Data);outp(ComPortAddr+4,0x0a);outp(ComPortAddr+1,0x01);disable();OldAsyncInt=getvect( IntVectNum );setvect( IntVectNum, AsyncInt );enable();maskb=inp(Port8259+1);if(IntVectNum=0x0c)outp(Port8259+1,maskb

5、&0xef);else outp(Port8259+1,maskb&0xf7);static void interrupt far AsyncInt(void)disable();if(CharsInBuf<MaxBufLen)BufferCircIn=inp(comportaddr);if(CircIn<MaxBufLen-1) CircIn+;else CircIn=0;if(CircIn=CircOut) CircOut+;else CharsInBuf+;enable();outp(Port8259,EofInt);void Restore(void) se

6、tvect(intvectnum,OldAsyncInt);outp(Port8259+1,maskb);int GetCharInBuf(unsigned char *Char)int Flag;Flag=-1;if(CharsInBuf>0)(*Char)=BufferCircOut;if(CircOut<MaxBufLen-1)CircOut+;else CircOut=0;CharsInBuf-;Flag=0;return Flag;int SendChar(unsigned char Char)if(inp(comportaddr+5)&0x20)=0) retu

7、rn -1;outp(comportaddr,Char);return 0;main()int i,c;unsigned char InChar;Init_COM(COM232,COMINT,1200,8,1,0);while(1)if(kbhit()if(InChar=getch()=27)break;else while(SendChar(InChar);if(GetCharInBuf(&InChar)=0)printf("%c",InChar);Restore();接收程序：#include <dos.h>#include <fstream.

8、h>#include <conio.h>#include <stdio.h>#include <stdlib.h>#include <math.h># define RXD 0 / 接收# define TXD 0 / 发送# define LSB 0 / 波特率调节低8 位# define MSB 1 / 波特率调节高8位# define IER 1 / 中断起用寄存器# define IIR 2 / 中断标识寄存器# define LCR 3 / 线路控制寄存器# define MCR 4 / 调制解调器控制寄存器# define LS

9、R 5 /线路状态寄存器#define MSR 6 / 调制解调器状态寄存器#define IERV 1#define OUT2 0x08#define ERTS 2#define EDTR 1#define EMPTY 0X20#define READY 0X30#define ICREG 0X20#define IMASKREG 0X21#define EOI 0X20#define WAITCOUNT 5000#define BUFFLEN 2048 / 用于存储字符的数组的界#define ALTE 0X12#define ALTQ 0X10#define SER_BAUD_1200

10、96#define SER_BAUD_2400 48#define SER_BAUD_9600 0x0C#define SER_BAUD_19200 6#define SER_STOP_1 0 /*/ 1 stop bit per character*/#define SER_STOP_2 4 /*/ 2 stop bits per character*/# define SER_BITS_5 0 /*/ send 5 bit characters*/# define SER_BITS_6 1 /*/ send 6 bit characters*/# define SER_BITS_7 2 /

11、*/ send 7 bit characters*/# define SER_BITS_8 3 /*/ send 8 bit characters*/# define SER_PARITY_NONE 0 /*/ no parity*/# define SER_PARITY_ODD 8 /*/ odd parity*/# define SER_PARITY_EVEN 24 /*/ even parity*/int port;int ComNum;unsigned portaddr;unsigned portf;unsigned int baudtable=0x180,0xc0,0x60,0x30

12、,0x18,0x0c,0x06;unsigned char paritytable=0x08,0x18,0x00,0x28,0x38;unsigned char bufferBUFFLEN;/recv bufint buffin=0;int buffout=0;int incount=0;int outcount=0;void interrupt(*vect_com)(.);void putb(unsigned char ch)/write a char to the recvbuf 将中断得到的数据写到缓冲区 int temp;temp=buffin;if(+buffin=BUFFLEN)b

13、uffin=0;if(buffin!=buffout)bufferbuffin=ch;/ printf("bufferin%d=%c",bufferbuffin);/ getch();elsebuffin=temp;unsigned char getb()/read a char from the recvbufif(buffout!=buffin)if(+buffout=BUFFLEN)buffout=0;/printf("bufferout%d=%c",buffout,bufferbuffout);return(bufferbuffout);else

14、return(0xff);/*unsigned char sender( unsigned char ch)outportb(portaddr2+TXD,ch);printf("nsender outportdata=%cn",ch);outcount+;return(1);*/void interrupt receiver(.)unsigned char ch;ch=inportb(portaddr+RXD);putb(ch);incount+; / 记录接收了多少个数据。outportb(ICREG,EOI);void SerInit(int baud,int conf

15、iguration)disable();outportb(portaddr+LCR,0x80);outportb(portaddr+LSB,baud);outportb(portaddr+MSB,0x00);outportb(portaddr+LCR,configuration);enable();void SerOpen(void)vect_com=getvect(portf+8);disable();inportb(portaddr+RXD);inportb(portaddr+MSR);inportb(portaddr+LSR);inportb(portaddr+IIR);outportb

16、(portaddr+IER,IERV);outportb(portaddr+MCR,OUT2|ERTS|EDTR);outportb(IMASKREG,inportb(IMASKREG)&(1<<portf);setvect(portf+8,receiver);enable();void SerClose(void)disable();outportb(portaddr+IER,0);outportb(portaddr+MCR,0);outportb(IMASKREG,inportb(IMASKREG)|(1<<portf);enable();setvect(p

17、ortf+8,vect_com);void Getportaddr(int port)switch (port)case 0: portaddr=0x3F8; break;case 1: portaddr=0x2F8; break;case 2: portaddr=0x3E8; break;case 3: portaddr=0x2E8; break;portf=(port=0)?4:3;void Int()unsigned char key,key2;port=ComNum-1;if(peek(0x40,port*2)=0)printf("have no special com .n

18、");exit(1);elseprintf("The used port is :COM%dn",ComNum);Getportaddr(port); / 得到串口地址SerInit(SER_BAUD_9600,SER_PARITY_EVEN| SER_BITS_8 | SER_STOP_1); /初始化SerOpen();doif(kbhit()key2=getch();if(key2=27) break;key=getb();if(key!=0xff)printf("%xt",key);FILE *fp;fp=fopen("C:R

19、eceivedata.dat","ab"); / 可选择接收数据的存放文件路径和文件名if(fp=NULL) printf("File open error!");/ fputc(key,fp);fwrite(&key,sizeof(unsigned char),1,fp);fclose(fp);while (key2!=27);SerClose();/ printf("%d char has been receivedn",incount);/ printf("%d char has been sende

20、dn",outcount);/ printf("nsum=%d n",sum);void main()/com1 receiveprintf("Please input the receive COMnum:(14)n");cin>>ComNum;printf("the current com set is:9600,even, data bits 8, stop 1,");Int();printf("nnOVERn");exit(0);发送文件程序#include <dos.h>

21、#include <bios.h>#include <stdio.h>#include <math.h>#include <conio.h>#include <graphics.h>#ifdef _cplusplus#define _CPPARGS .#else#define _CPPARGS#endif# define SER_RBF 0# define SER_THR 0# define SER_IER 1# define SER_IIR 2# define SER_LCR 3# define SER_MCR 4# define

22、SER_LSR 5# define SER_MSR 6# define SER_DLL 0#define SER_DLH 1#define SER_BAUD_1200 96#define SER_BAUD_2400 48#define SER_BAUD_9600 12#define SER_BAUD_19200 6#define SER_GP02 8#define COM_1 0x3F8# define COM_2 0x2F8 /*/ base port address of port 1*/# define COM_3 0x3E8# define COM_4 0x2E8# define SE

23、R_STOP_1 0 /*/ 1 stop bit per character*/# define SER_STOP_2 4 /*/ 2 stop bits per character*/# define SER_BITS_5 0 /*/ send 5 bit characters*/# define SER_BITS_6 1 /*/ send 6 bit characters*/# define SER_BITS_7 2 /*/ send 7 bit characters*/# define SER_BITS_8 3 /*/ send 8 bit characters*/# define S

24、ER_PARITY_NONE 0 /*/ no parity*/#define SER_PARITY_ODD 8 /*/ odd parity*/#define SER_PARITY_EVEN 24 /*/ even parity*/#define SER_DIV_LATCH_ON 128 /*/ used to turn reg 0,1 into divisor latch*/#define PIC_IMR 0x21 /*/ pic's interrupt mask reg.*/#define PIC_ICR 0x20 /*/ pic's interupt control r

25、eg.*/#define INT_SER_PORT_0 0x0C /*/ port 0 interrupt com 1 & 3*/#define INT_SER_PORT_1 0x0B /*/ port 0 interrupt com 2 & 4*/#define SERIAL_BUFF_SIZE 128 /*/ current size of circulating receive buffer*/void interrupt far (*Old_Isr)(_CPPARGS); /*/ holds old com port interrupt handler*/ char s

26、er_bufferSERIAL_BUFF_SIZE; /*/ the receive buffer*/ int ser_end = -1,ser_start=-1; /*/ indexes into receive buffer*/ int ser_ch, char_ready=0; /*/ current character and ready flag*/ int old_int_mask; /*/ the old interrupt mask on the PIC*/ int open_port; /*/ the currently open port*/int serial_lock

27、= 0; /*/ serial ISR semaphore so the buffer*/*/ isn't altered will it is being written*/*/ to by the ISR*/* 写串口 */void interrupt far Serial_Isr(_CPPARGS)serial_lock = 1;ser_ch = inp(open_port + SER_RBF);if (+ser_end > SERIAL_BUFF_SIZE-1)ser_end = 0;ser_bufferser_end = ser_ch;+char_ready;outp(

28、PIC_ICR,0x20);serial_lock = 0;int Ready_Serial()return(char_ready);/* 读串口 */int Serial_Read()int ch;while(serial_lock)if (ser_end != ser_start)if (+ser_start > SERIAL_BUFF_SIZE-1)ser_start = 0;ch = ser_bufferser_start;printf("%x",ch);if (char_ready > 0)-char_ready;return(ch);elseretu

29、rn(0);/* 写串口 */Serial_Write(char ch)while(!(inp(open_port + SER_LSR) & 0x20) asm clioutp(open_port + SER_THR, ch);asm sti/* 初始化串口*/Open_Serial(int port_base, int baud, int configuration)open_port = port_base;disable();outp(port_base + SER_LCR, SER_DIV_LATCH_ON);outp(port_base + SER_DLL, baud);ou

30、tp(port_base + SER_DLH, 0);outp(port_base + SER_LCR, configuration);outp(port_base + SER_MCR, SER_GP02);outp(port_base + SER_IER, 1);if (port_base = COM_1 | port_base=COM_3)Old_Isr = _dos_getvect(INT_SER_PORT_0);_dos_setvect(INT_SER_PORT_0, Serial_Isr);printf("nOpening Communications Channel Co

31、m Port #1/3.n");elseOld_Isr = _dos_getvect(INT_SER_PORT_1);_dos_setvect(INT_SER_PORT_1, Serial_Isr);printf("nOpening Communications Channel Com Port #2/4.n");old_int_mask = inp(PIC_IMR);outp(PIC_IMR, (port_base=COM_1) ? (old_int_mask & 0xEF) : (old_int_mask & 0xF7 ); enable();

32、/* 关闭串口*/Close_Serial(int port_base)outp(port_base + SER_MCR, 0);outp(port_base + SER_IER, 0);outp(PIC_IMR, old_int_mask );if (port_base = COM_1)_dos_setvect(INT_SER_PORT_0, Old_Isr);printf("nClosing Communications Channel Com Port #1.n");else_dos_setvect(INT_SER_PORT_1, Old_Isr);printf(&q

33、uot;nClosing Communications Channel Com Port #2.n");/* 发送应用*/void main(int argc,char *argv)char ch,press;int done=0;FILE *fp;argc=2;/argv1="c:comfile.c"if(argc<2)printf("nUsage:display filename.wav!");/ exit(1);if(fp=fopen(argv1,"r+b")=NULL)printf("cannot open the filen");/ exit(0);fseek(fp, 0, SEEK_SET);Open_Serial(COM_1,SER_BAUD_9600,SER_PARITY_EVEN| SER_BITS_8SER_STOP_1);print