//serialport.h
/************************************************************* FileName : serialport.h FileFunc : 定义头文件 Version : V0.1 Author : Sunrier Date : 2012-06-13 Descp : Linux下实现串口库 *************************************************************/#ifndef _SERIALPORT_H_ #define _SERIALPORT_H_ #ifdef __cplusplusextern "C" {#endifint open_port(int iPortNumber);int set_port(int fd,int iBaudRate,int iDataSize,char cParity,int iStopBit);int read_port(int fd,void *buf,int iByte);int write_port(int fd,void *buf,int iByte);int close_port(int fd);#ifdef __cplusplus}#endif#endif
//serialport.c
/************************************************************* FileName : serialport.c FileFunc : 定义实现文件 Version : V0.1 Author : Sunrier Date : 2012-06-13 Descp : Linux下实现串口库 *************************************************************/ /*#include "serialport.h"*/#include <stdio.h>#include <strings.h>#include <unistd.h>#include <fcntl.h>#include <termios.h>int open_port(int iPortNumber){int fd = -1;char *pDev[]={"/dev/ttyS0","/dev/ttyS1","/dev/ttyS2","/dev/ttyS3","/dev/ttyS4","/dev/ttyS5","/dev/ttyS6","/dev/ttyS7","/dev/ttyS8","/dev/ttyS9","/dev/ttyS10","/dev/ttyS11"};switch( iPortNumber ){case1:case2:case3:case4:case5:case 6:case 7:case 8:case 9:case 10:case 11:case 12:fd = open(pDev[iPortNumber-1],O_RDWR|O_NOCTTY|O_NDELAY);if( fd<0 ){perror("Can't Open Serial Port !");return (-1);}else{printf("Open ttyS%d ......\n",iPortNumber-1);}break;default:/*perror("Don't exist iPortNumber !");*/printf("Don't exist iPortNumber%d under /dev/? !\n",iPortNumber);return (-1);}if( fcntl(fd,F_SETFL,0)<0 )/*恢复串口的状态为阻塞状态，用于等待串口数据的读入*/{printf("fcntl failed !\n");return (-1);}else{printf("fcntl = %d !\n",fcntl(fd,F_SETFL,0));}/*测试打开的文件描述符是否应用一个终端设备，以进一步确认串口是否正确打开*/if( !isatty(STDIN_FILENO) ){printf("Standard input isn't a terminal device !\n");return (-1);}else{printf("It's a serial terminal device!\n");}printf("open_port file ID= %d !\n",fd);return fd;}int set_port(int fd,int iBaudRate,int iDataSize,char cParity,int iStopBit){int iResult = 0;struct termios oldtio,newtio;iResult = tcgetattr(fd,&oldtio);/*保存原先串口配置*/if( iResult ){perror("Can't get old terminal description !");return (-1);}bzero(&newtio,sizeof(newtio));newtio.c_cflag |= CLOCAL | CREAD;/*设置本地连接和接收使用*//*设置输入输出波特率*/switch( iBaudRate ){case 2400:cfsetispeed(&newtio,B2400);cfsetospeed(&newtio,B2400);break;case 4800:cfsetispeed(&newtio,B4800);cfsetospeed(&newtio,B4800);break;case 9600:cfsetispeed(&newtio,B9600);cfsetospeed(&newtio,B9600);break;case 19200:cfsetispeed(&newtio,B19200);cfsetospeed(&newtio,B19200);break;case 38400:cfsetispeed(&newtio,B38400);cfsetospeed(&newtio,B38400);break;case 57600:cfsetispeed(&newtio,B57600);cfsetospeed(&newtio,B57600);break;case 115200:cfsetispeed(&newtio,B115200);cfsetospeed(&newtio,B115200);break;case 460800:cfsetispeed(&newtio,B460800);cfsetospeed(&newtio,B460800);break;default:/*perror("Don't exist iBaudRate !");*/printf("Don't exist iBaudRate %d !\n",iBaudRate);return (-1);}/*设置数据位*/newtio.c_cflag &= (~CSIZE);switch( iDataSize ){case7:newtio.c_cflag |= CS7;break;case8:newtio.c_cflag |= CS8;break;default:/*perror("Don't exist iDataSize !");*/printf("Don't exist iDataSize %d !\n",iDataSize);return (-1);}/*设置校验位*/switch( cParity ){case'N':/*无校验*/newtio.c_cflag &= (~PARENB);break;case'O':/*奇校验*/newtio.c_cflag |= PARENB;newtio.c_cflag |= PARODD;newtio.c_iflag |= (INPCK | ISTRIP);break;case'E':/*偶校验*/newtio.c_cflag |= PARENB;newtio.c_cflag &= (~PARODD);newtio.c_iflag |= (INPCK | ISTRIP);break;default:/*perror("Don't exist cParity !");*/printf("Don't exist cParity %c !\n",cParity);return (-1);}/*设置停止位*/switch( iStopBit ){case1:newtio.c_cflag &= (~CSTOPB);break;case2:newtio.c_cflag |= CSTOPB;break;default:/*perror("Don't exist iStopBit !");*/printf("Don't exist iStopBit %d !\n",iStopBit);return (-1);}newtio.c_cc[VTIME] = 0;/*设置等待时间*/newtio.c_cc[VMIN] = 0;/*设置最小字符*/tcflush(fd,TCIFLUSH);/*刷新输入队列(TCIOFLUSH为刷新输入输出队列)*/iResult = tcsetattr(fd,TCSANOW,&newtio);/*激活新的设置使之生效,参数TCSANOW表示更改立即发生*/if( iResult ){perror("Set new terminal description error !");return (-1);}printf("set_port success !\n");return 0;}int read_port(int fd,void *buf,int iByte){int iLen = 0;if( !iByte ){printf("Read byte number error !\n");return iLen;}iLen = read(fd,buf,iByte);return iLen;}int write_port(int fd,void *buf,int iByte){int iLen = 0;if( !iByte ){printf("Write byte number error !\n");return iLen;}iLen = write(fd,buf,iByte);return iLen;}int close_port(int fd){int iResult = -1;iResult = close(fd);return iResult;}
//demo.c
/************************************************************* FileName : demo.c FileFunc : 测试串口应用 Version : V0.1 Author : Sunrier Date : 2012-06-13 Descp : Linux下实现串口库 *************************************************************/#include <stdio.h>#include <string.h>#include "serialport.h"int main(int argc,char *argv[]){int iResult = -1;int fd = -1,iCommPort,iBaudRate,iDataSize,iStopBit;char cParity;int iLen;char szBuffer[30];iCommPort = 1;fd = open_port(iCommPort);if( fd<0 ){perror("open_port error !");return 1;}iBaudRate = 115200;iDataSize = 8;cParity = 'N';iStopBit = 1;iResult = set_port(fd,iBaudRate,iDataSize,cParity,iStopBit);if( iResult<0 ){perror("set_port error !");return 1;}printf("fd = %d \n",fd);//memset(szBuffer,0,sizeof(szBuffer));//iLen = read_port(fd,szBuffer,5);iLen = write_port(fd,"Hello",5);memset(szBuffer,0,sizeof(szBuffer));iLen = read_port(fd,szBuffer,5);if( iLen>0 )//printf("Write byte success !\n");//szBuffer[iLen+1] = '\0';printf("iLen = %d ,szBuffer = %s \n",iLen,szBuffer);return 0;}
每年的情人节圣诞节除夕，也和他共度。甚至连吵架也是重复的，
