serial_port_test_program.rar_Serial Port test_linux 串口_linux 串口工

#include <stdio.h> //printf #include <fcntl.h> //open #include <string.h> //bzero #include <stdlib.h> //exit #include <sys/times.h> //times #include <sys/types.h> //pid_t #include <termios.h> //termios,tcgetattr(),tcsetattr() #include <unistd.h> #include <sys/ioctl.h> //ioctl #include <errno.h> #include "mycom.h" /*************************************************** * 波特率转换函数 ****************************************************/ int convbaud(unsigned long int baudrate) { switch(baudrate) { case 0: { printf("Your baudrate is zero!\n"); printf("example:./serial_recv /dev/ttyS0 38400 8 0 0 2 1\n"); exit (-1); } case 50: return B50; case 75: return B75; case 110: return B110; case 134: return B134; case 150: return B150; case 200: return B200; case 300: return B300; case 600: return B600; case 1200: return B1200; case 1800: return B1800; case 2400: return B2400; case 4800: return B4800; case 9600: return B9600; case 19200: return B19200; case 38400: return B38400; case 57600: return B57600; case 115200: return B115200; case 230400: return B230400; default: return B9600; } } /******************************************************* * Setup comm attr * com:串口文件描述符,pportinfo:待设置的端口信息 * ********************************************************/ int PortSet(int com,const pportinfo_t pportinfo) { struct termios termios_old,termios_new; int baudrate,tmp; char databit,stopbit,parity,flowcontrol; bzero(&termios_old,sizeof(termios_old)); bzero(&termios_new,sizeof(termios_new)); cfmakeraw(&termios_new); tcgetattr(com,&termios_old); //get the serial port attributions /*********设置端口属性*********/ //baudrates baudrate = convbaud(pportinfo -> baudrate); cfsetispeed(&termios_new,baudrate); //填入串口输入端口波特率 cfsetospeed(&termios_new,baudrate); //填入串口输出端的波特率 termios_new.c_cflag |= CLOCAL; //控制模式,保证程序不会成为端口的占有者 termios_new.c_cflag |= CREAD; //控制模式,flow control flowcontrol = pportinfo -> flowcontrol; switch(flowcontrol) { case '0': { termios_new.c_cflag &= ~CRTSCTS; //no flow control }break; case '1': { termios_new.c_cflag |=CRTSCTS; //hardware flow control }break; case '2': { termios_new.c_cflag |=IXON|IXOFF|IXANY; //software flow control }break; } //控制模式,data bits termios_new.c_cflag &= ~CSIZE; //控制模式,屏蔽字符宽度大小位 databit = pportinfo -> databit; switch(databit) { case '5': termios_new.c_cflag |= CS5; case '6': termios_new.c_cflag |= CS6; case '7': termios_new.c_cflag |= CS7; default: termios_new.c_cflag |= CS8; } //控制模式 parity check parity = pportinfo->parity; switch(parity) { case '0': { termios_new.c_cflag &= ~PARENB; //no parity check }break; case '1': { termios_new.c_cflag |= PARENB; //odd check termios_new.c_cflag &= ~PARODD; }break; case '2': { termios_new.c_cflag |= PARENB; //even check termios_new.c_cflag |= PARODD; }break; /*default: { termios_new.c_cflag &= ~PARENB; //no parity check }break;*/ } //控制模式,stop bits stopbit = pportinfo -> stopbit; if(stopbit == '2') { termios_new.c_cflag |= CSTOPB; //2 top bits } else{ termios_new.c_cflag &= ~CSTOPB; //1 top bits } //other attributions default termios_new.c_oflag &= ~OPOST; //输出模式 termios_new.c_cc[VMIN] = 1; //控制字符,所要读取的字符的最小数量 termios_new.c_cc[VTIME] = 1; //控制字符,读取第一个字符的等待时间unit:(1/10)second tcflush(com,TCIFLUSH); //溢出的数据可以接收,但不读 tmp = tcsetattr(com,TCSANOW,&termios_new); //设置新属性,TCSANOW:所有改变立即生效 tcgetattr(com,&termios_old); return(tmp); } /********************************************** * Open serial port * tty:端口号 ttyS0,ttyS1,... * 返回值为串口文件描述符 ***********************************************/ int PortOpen(pportinfo_t pportinfo) { int com; //串口文件描述符 com = open(pportinfo->tty,O_WRONLY); return (com); } /************************************************ * Close serial port *************************************************/ void PortClose(int com) { close(com); } /************************************************* * send data * com:串口描述符,data: 待发送数据,datalen:数据长度 * 返回实际长度 **************************************************/ int PortSend(int com,const void *data,int datalen) { int len=0; len = write(com,data,datalen); //实际写入的长度 // printf("len=%d\n",len); if(len == datalen) { return(len); } else{ tcflush(com,TCOFLUSH); return -1; } } /*****************Friendly Reminding***************/ void PrintUage(){ printf("\t\tThe is Com send programe\n"); printf("\t\tuage:./serial_send <device> <baudrate> <databit> <parity> <flowcontrol> <stopbit> <sleep_mode>[serial_mode]\n"); printf("\t\texample:recv /dev/ttyS0 38400 8 0 0 2 1 485\n"); printf("\t\tserial_mode=232 422 485 or 485u\n"); printf("\t\t mode 1 -----sleep\n\t\tmode 0------not sleep\n"); printf("\t\t edition communication 2008-5-5 gj\n"); sleep(1); } /*************485 or485u****************************/ void RTS_HIGH(int com) { int status; status=TIOCM_RTS; ioctl(com,TIOCMBIC,&status); } void RTS_LOW(int com) { int status; status=TIOCM_RTS; ioctl(com,TIOCMBIS,&status); } /***************************Test*******************/ int main(int argc,char *argv[]) { int com = 0; int SendLen=0; int count = 0; const char buffer[]="1234567890abcdefghijklmnopqrstuvwxyz1234567890abcdefghijklmnopqrstuvwxyz"; portinfo_t portinfo; int serial_mode; int mode=0; if(argc < 8 || argc > 9) { PrintUage(); exit(1); } strncpy(portinfo.tty,argv[1],30); portinfo.baudrate = atoi(argv[2]); portinfo.databit = argv[3][0]; portinfo.flowcontrol = argv[5][0]; portinfo.parity = argv[4][0]; portinfo.stopbit = argv[6][0]; mode=atoi(argv[7]); // serial_mode=(argv[8][0]-'0'); if(argc == 9) { if(strcmp(argv[8] , "485u") == 0) serial_mode = 4856; else serial_mode=atoi(argv[8]); }else{ serial_mode = 232; } com = PortOpen(&portinfo); if(com < 0) { printf("Error:open serial port error,errmsg=%s\n",strerror(errno)); exit(1); } PortSet(com,&portinfo);