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本篇文章为大家展示了C++中怎么实现串口通信，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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#include#include #include #include #include #include #include #include #include int set_serial(int fd,int nSpeed,int nBits,char nEvent,int nStop) { struct termios newttys1,oldttys1; /*保存原有串口配置*/ if(tcgetattr(fd,&oldttys1)!=0) { perror("Setupserial 1"); return -1; } bzero(&newttys1,sizeof(newttys1)); newttys1.c_cflag|=(CLOCAL|CREAD ); /*CREAD 开启串行数据接收，CLOCAL并打开本地连接模式*/ newttys1.c_cflag &=~CSIZE;/*设置数据位*/ /*数据位选择*/ switch(nBits) { case 7: newttys1.c_cflag |=CS7; break; case 8: newttys1.c_cflag |=CS8; break; } /*设置奇偶校验位*/ switch( nEvent ) { case '0': /*奇校验*/ newttys1.c_cflag |= PARENB;/*开启奇偶校验*/ newttys1.c_iflag |= (INPCK | ISTRIP);/*INPCK打开输入奇偶校验；ISTRIP去除字符的第八个比特 */ newttys1.c_cflag |= PARODD;/*启用奇校验(默认为偶校验)*/ break; case 'E':/*偶校验*/ newttys1.c_cflag |= PARENB; /*开启奇偶校验 */ newttys1.c_iflag |= ( INPCK | ISTRIP);/*打开输入奇偶校验并去除字符第八个比特*/ newttys1.c_cflag &= ~PARODD;/*启用偶校验*/ break; case 'N': /*无奇偶校验*/ newttys1.c_cflag &= ~PARENB; break; } /*设置波特率*/ switch( nSpeed ) { case 2400: cfsetispeed(&newttys1, B2400); cfsetospeed(&newttys1, B2400); break; case 4800: cfsetispeed(&newttys1, B4800); cfsetospeed(&newttys1, B4800); break; case 9600: cfsetispeed(&newttys1, B9600); cfsetospeed(&newttys1, B9600); break; case 115200: cfsetispeed(&newttys1, B115200); cfsetospeed(&newttys1, B115200); break; default: cfsetispeed(&newttys1, B9600); cfsetospeed(&newttys1, B9600); break; } /*设置停止位*/ if( nStop == 1)/*设置停止位；若停止位为1，则清除CSTOPB，若停止位为2，则激活CSTOPB*/ { newttys1.c_cflag &= ~CSTOPB;/*默认为一位停止位； */ } else if( nStop == 2) { newttys1.c_cflag |= CSTOPB;/*CSTOPB表示送两位停止位*/ } /*设置最少字符和等待时间，对于接收字符和等待时间没有特别的要求时*/ newttys1.c_cc[VTIME] = 0;/*非规范模式读取时的超时时间；*/ newttys1.c_cc[VMIN] = 0; /*非规范模式读取时的最小字符数*/ tcflush(fd ,TCIFLUSH);/*tcflush清空终端未完成的输入/输出请求及数据；TCIFLUSH表示清空正收到的数据，且不读取出来 */ /*激活配置使其生效*/ if((tcsetattr( fd, TCSANOW,&newttys1))!=0) { perror("com set error"); return -1; } return 0; }
SINGAL信号形式
#include#include #include #include #include #include #include #include #include #include #define FALSE -1 #define TRUE 0 #define flag 1 #define noflag 0 int wait_flag = noflag; int STOP = 0; int res; int speed_arr[] = {B38400, B19200, B9600, B4800, B2400, B1200, B300, B38400, B19200, B9600, B4800, B2400, B1200, B300,}; int name_arr[] = {38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400, 1200, 300,}; void set_speed(int fd, int speed) { int i; int status; struct termios Opt; tcgetattr(fd, &Opt); for (i = 0; i < sizeof(speed_arr) / sizeof(int); i++) { if (speed == name_arr[i]) { tcflush(fd, TCIOFLUSH); cfsetispeed(&Opt, speed_arr[i]); cfsetospeed(&Opt, speed_arr[i]); status = tcsetattr(fd, TCSANOW, &Opt); if (status != 0) { perror("tcsetattr fd1"); return; } tcflush(fd, TCIOFLUSH); } } } int set_Parity(int fd, int databits, int stopbits, int parity) { struct termios options; if (tcgetattr(fd, &options) != 0) { perror("SetupSerial 1"); return (FALSE); } options.c_cflag &= ~CSIZE; switch (databits) { case 7: options.c_cflag |= CS7; break; case 8: options.c_cflag |= CS8; break; default: fprintf(stderr, "Unsupported data size\n"); return (FALSE); } switch (parity) { case 'n': case 'N': options.c_cflag &= ~PARENB; /* Clear parity enable */ options.c_iflag &= ~INPCK; /* Enable parity checking */ break; case 'o': case 'O': options.c_cflag |= (PARODD | PARENB); options.c_iflag |= INPCK; /* Disnable parity checking */ break; case 'e': case 'E': options.c_cflag |= PARENB; /* Enable parity */ options.c_cflag &= ~PARODD; options.c_iflag |= INPCK; /* Disnable parity checking */ break; case 'S': case 's': /*as no parity */ options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB; break; default: fprintf(stderr, "Unsupported parity\n"); return (FALSE); } switch (stopbits) { case 1: options.c_cflag &= ~CSTOPB; break; case 2: options.c_cflag |= CSTOPB; break; default: fprintf(stderr, "Unsupported stop bits\n"); return (FALSE); } /* Set input parity option */ if (parity != 'n') options.c_iflag |= INPCK; tcflush(fd, TCIFLUSH); options.c_cc[VTIME] = 150; options.c_cc[VMIN] = 0; /* Update the options and do it NOW */ if (tcsetattr(fd, TCSANOW, &options) != 0) { perror("SetupSerial 3"); return (FALSE); } return (TRUE); } void signal_handler_IO(int status) { printf("received SIGIO signale.\n"); wait_flag = noflag; } int main() { printf("This program updates last time at %s %s\n", __TIME__, __DATE__); printf("STDIO COM1\n"); int fd; struct sigaction saio; fd = open("/dev/ttyUSB0", O_RDWR); if (fd == -1) { perror("serialport error\n"); } else { printf("open "); printf("%s", ttyname(fd)); printf(" succesfully\n"); } saio.sa_handler = signal_handler_IO; sigemptyset(&saio.sa_mask); saio.sa_flags = 0; saio.sa_restorer = NULL; sigaction(SIGIO, &saio, NULL); //allow the process to receive SIGIO fcntl(fd, F_SETOWN, getpid()); //make the file descriptor asynchronous fcntl(fd, F_SETFL, FASYNC); set_speed(fd, 9600); if (set_Parity(fd, 8, 1, 'N') == FALSE) { printf("Set Parity Error\n"); exit(0); } char buf[254]={0}; while (STOP == 0) { usleep(100000); /* after receving SIGIO ,wait_flag = FALSE,input is availabe and can be read */ if (wait_flag == 0) { memset(buf, 0, sizeof(buf)); res = read(fd, buf, 254); if ((int) buf[0] == 85) { for (int i = 0; i < 254; i++) { std::cout << std::hex << (int) buf[i] << " "; } std::cout << std::endl; } // printf("nread=%d,%s\n", res,buf); // if (res ==1) // STOP = 1; /*stop loop if only a CR was input */ wait_flag = flag; /*wait for new input */ } } close(fd); return 0; }
select阻塞形式
