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代码:<br />#include /*标准输入输出定义*/#include /*标准函数库定义*/#include /*Unix标准函数定义*/#include /**/#include /**/#include /*文件控制定义*/#include /*PPSIX终端控制定义*/#include /*错误号定义*//***@brief 设置串口通信速率*@param fd 类型 int 打开串口的文件句柄*@param speed 类型 int 串口速度*@return void*/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) { tcflush(fd, TCIOFLUSH); cfsetispeed(&Opt, speed_arr); cfsetospeed(&Opt, speed_arr); status = tcsetattr(fd, TCSANOW, &Opt); if (status != 0) perror('tcsetattr fd1'); return; } tcflush(fd,TCIOFLUSH); }}/***@brief 设置串口数据位，停止位和效验位*@param fd 类型 int 打开的串口文件句柄**@param databits 类型 int 数据位 取值 为 7 或者8**@param stopbits 类型 int 停止位 取值为 1 或者2**@param parity 类型 int 效验类型 取值为N,E,O,,S*/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) /*设置数据位数*/ { 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); /* 设置为奇效验*/ options.c_iflag |= INPCK; /* Disnable parity checking */ break; case 'e': case 'E': options.c_cflag |= PARENB; /* Enable parity */ options.c_cflag &= ~PARODD; /* 转换为偶效验*/ 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); } /* 设置停止位*/ 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; options.c_cc[VTIME] = 150; // 15 seconds options.c_cc[VMIN] = 0; tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */ if (tcsetattr(fd,TCSANOW,&options) != 0) { perror('SetupSerial 3'); return (FALSE); } return (TRUE); }/***@breif 打开串口*/int OpenDev(char *Dev){int fd = open( Dev, O_RDWR ); //| O_NOCTTY | O_NDELAY if (-1 == fd) { /*设置数据位数*/ perror('Can't Open Serial Port'); return -1; } else return fd;}/***@breif main()*/int main(int argc, char **argv){ int fd; int nread; char buff[512];/* 打开串口 * 在 Linux 下串口文件是位于 /dev 下的 * 串口一为/dev/ttyS0,串口二为/dev/ttyS1 */ char *dev ='/dev/ttyS1';/* 打开串口是通过使用标准的文件打开函数操作： */ fd = OpenDev(dev); if (fd>0) set_speed(fd,19200); else { printf('Can't Open Serial Port!\n'); exit(0); } if (set_Parity(fd,8,1,'N')== FALSE) { printf('Set Parity Error\n'); exit(1); } while(1) { while((nread = read(fd,buff,512))>0) { printf('\nLen %d\n',nread); buff[nread+1]='\ 0'; printf('\n%s',buff); } } //close(fd); //exit(0);}<br /> <br /> <br /> |
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