c语言串口通信范例

1、一个c语言的串口通信程序范例L3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 #i nclude #in clude #in clude vconi o.h #include #defi ne COM232 0x2f8#defi ne COMINT 0x0b#defi ne MaxBufLen500#defi ne Port82590x200x20#defi ne EofI nt static int comportaddr;static cha

2、r in tvect num;static un sig ned char maskb;static un sig ned char BufferMaxBufLe n;static intCharsI nBuf,Circl n, CircOut;static void (in terrupt far *OldAs yncln t)();static void in terrupt far Asyn cI nt(void);void In it_COM(i nt ComPortAddr, un sig ned char In tVectNum, i nt Baud,unsigned char D

3、ata, unsigned char Stop, unsigned char Parity) un sig ned char High,Low;int f;comportaddr=ComPortAddr;in tvect num=1 ntVectNum;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=(Data-5)|(S

4、top-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&0x

5、ef); else outp(Port8259+1,maskb&0xf7);static void interrupt far AsyncInt(void) disable();if(CharsInBufMaxBufLen)BufferCircIn=inp(comportaddr); if(CircIn0)(*Char)=BufferCircOut; if(CircOutMaxBufLen-1)CircOut+;else CircOut=0;CharsInBuf-;Flag=0;return Flag;int SendChar(unsigned char Char)if(inp(comport

6、addr+5)&0x20)=0) return -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 #include #include #include

7、 #include #include #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 LSR 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#de

8、fine 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 96#define SER_BAUD_2400 48#define SER_BAUD_9600 0x0C#define SER_BAUD_19200 6#define S

9、ER_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 SER

10、_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=0x180,0xc0,0x60,0x30,0x18,0x0c,0x06;unsigned char paritytable=0x08,0x18,0x00,0x28,0x38;unsigned char bufferBU

11、FFLEN;/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)buffin=0;if(buffin!=buffout)bufferbuffin=ch;/ printf(bufferin%d=%c,bufferbuffin);/ getch()

12、;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);elsereturn(0xff);/*unsigned char sender( unsigned char ch) outportb(portaddr2+TXD,ch); printf(nsender outportdata=%cn

13、,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 configuration) disable();outportb(portaddr+LCR,0x80); outportb(portaddr+LSB,baud); outportb(portaddr+MSB,0x00); outportb(por

14、taddr+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(portaddr+IER,IERV); outportb(portaddr+MCR,OUT2|ERTS|EDTR); outportb(IMASKREG,inportb(IMASKREG)&(1portf); setve

15、ct(portf+8,receiver);enable();void SerClose(void) disable();outportb(portaddr+IER,0); outportb(portaddr+MCR,0); outportb(IMASKREG,inportb(IMASKREG)|(1ComNum;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 #include #include #include #includ

16、e #include #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 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 S

17、ER_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 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

18、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 SER_PARITY_NONE 0 /*/ no parity*/#define SER_PARITY_ODD 8 /*/ odd parity*/#define SER_PARITY_EVEN 24 /*/ even parity*/#define SER_

19、DIV_LATCH_ON 128 /*/ used to turn reg 0,1 into divisor latch*/ #define PIC_IMR 0x21 /*/ pics interrupt mask reg.*/#define PIC_ICR 0x20 /*/ pics interupt control reg.*/#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 SERIA

20、L_BUFF_SIZE 128 /*/ current size of circulating receive buffer*/ void interrupt far (*Old_Isr)(_CPPARGS); /*/ holds old com port interrupt handler*/ char ser_bufferSERIAL_BUFF_SIZE; /*/ the receive buffer*/ int ser_end = -1,ser_start=-1; /*/ indexes into receive buffer*/ int ser_ch, char_ready=0; /*

21、/ 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 = 0; /*/ serial ISR semaphore so the buffer*/*/ isnt altered will it is being written*/*/ to by the ISR*/* 写串口 */void interrupt far Serial_Isr(_C

22、PPARGS) 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(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

23、_start SERIAL_BUFF_SIZE-1) ser_start = 0;ch = ser_bufferser_start; printf(%x,ch);if (char_ready 0)-char_ready; return(ch);elsereturn(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,

24、int configuration) open_port = port_base;disable();outp(port_base + SER_LCR, SER_DIV_LATCH_ON); outp(port_base + SER_DLL, baud);outp(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=C

25、OM_3) Old_Isr = _dos_getvect(INT_SER_PORT_0);_dos_setvect(INT_SER_PORT_0, Serial_Isr); printf(nOpening Communications Channel Com 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 =

26、inp(PIC_IMR);outp(PIC_IMR, (port_base=COM_1) ? (old_int_mask & 0xEF) : (old_int_mask & 0xF7 ); enable();/* 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(nC

27、losing Communications Channel Com Port #1.n);else_dos_setvect(INT_SER_PORT_1, Old_Isr); printf(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(argc2) printf(nUsage:display filename.wav!);/ exit(1); if(fp=fopen(argv1,r+b)=NULL)prin tf(ca nnot ope n the filen);/ exit(0);fseek(fp, 0, SEEK_SET);Open_Serial(COM_1,SER_BAUD_9600,SER_PARITY_EVEN|SER_BITS_8 |SER_STOP_1);printf(com:1;bps:9600;parity:even;bits:8;stop bit:1);prin tf(press any key to beg in sendin g);getch();Serial_Write(”); /该语句可用于发送单个