C ++ code for a serial port operation

The following is a C ++ code for serial port operations. The running environment of this Code is Linux

# Ifndef _ serialcom_h _ # DEFINE _ serialcom_h_typedef struct _ serialconfig _ {long baud;/* baud rate: for example, 38400,115200 */unsigned char databits;/* Data bit 0-8; 1-7; 2-6 bits; 3-5 bits; */unsigned char parity;/* parity bits: 0-No parity; 1-set to odd verify; 2-convert to an even verification */unsigned char stopbits;/* Stop bit: 0--1 stop bit; 1--2 stop bit */} serialconfig_t; Class serialcom {public: serialcom (); serialcom (serialconfig_t serialconf, int delay, int choice );~ Serialcom (); int serialcomopen (); int serialcomclose (); int checkserialcomdata (); int serialcomread (char * pbuffer, int datalen); int serialcomwrite (char * pbuffer, int datalen); protected: int comfd;/* serial port descriptor */INT Stat; long baud;/* baud rate: for example, 38400,115200 */unsigned char databits;/* Data bit 0-8; 1-7 bits; 2-6 bits; 3-5 bits; */unsigned char parity;/* parity bits: 0-No parity; 1-set to odd verify; 2-convert to an even verification */unsigned char stopbits;/* Stop bit: 0-1 stop bit; 1-2 stop bit */int usec; int port;/*, 2; only 3 choice */
#endif
# Include "serialcom. H "# include <stdio. h> # include <stdlib. h> # include <string. h> # include <fcntl. h> # include <unistd. h> # include <sys/types. h> # include <sys/STAT. h> # include <termios. h> # include <errno. h ># include <iostream> using namespace STD; serialcom: serialcom () {long baud = 19200; unsigned char databits = '8'; unsigned char parity = 'n '; unsigned char stopbits = '1'; USEC = 1; Port = 2; stat = 0; comfd =-1; s TD: cout <baud <"\ t" <databits <"\ t" <parity <"\ t" <stopbits <STD :: endl;} serialcom: serialcom (serialconfig_t serialconf, int delay, int choice) {long baud = serialconf. baud; unsigned char databits = serialconf. databits; unsigned char parity = serialconf. parity; unsigned char stopbits = serialconf. stopbits; USEC = delay; Port = choice; stat = 0; comfd =-1;} serialcom ::~ Serialcom () {} int serialcom: serialcomopen () {char Dev [] [13] = {"/dev/tty0", "/dev/tty1 ", "/dev/ttys0"}; // corresponding port here, select the serial port you want to open if (Port <0) | (Port> 2 )) {printf ("the port is out range"); Return-1;}/* Open Port */comfd = open (Dev [port], o_rdwr | o_noctty | o_ndelay ); if (comfd <0) {comfd = open (Dev [port], o_rdwr | o_noctty | o_ndelay); If (comfd <0) {perror ("open serial port "); return-1 ;}} if (Fcntl (comfd, f_setfl, 0) <0) {perror ("fcntl f_setfl");} If (isatty (comfd) = 0) {perror ("isatty is not a terminal device");} stat = 1; struct termios new_cfg, old_cfg; int speed_arry [] = {b2400, b4800, b9600, b19200, b38400, b115200}; int speed [] = {2400,4800, 9600,19200, 38400,115200}; int I = 0;/* Save and test the serial port */If (tcgetattr (comfd, & old_cfg) <0) {perror ("tcgetattr"); Return-1;} ne W_cfg = old_cfg; cfmakeraw (& new_cfg); new_cfg.c_cflag & = ~ Csize; for (I = sizeof (speed_arry)/sizeof (speed_arry [0]); I> 0; I --) {If (baud = speed [I]) {cfsetispeed (& new_cfg, speed_arry [I]); cfsetospeed (& new_cfg, speed_arry [I]) ;}} switch (databits) {Case '7': new_cfg.c_cflag | = cs7; break; default: Case '8': new_cfg.c_cflag | = cs8; break;} switch (parity) {default: Case 'N': {new_cfg.c_cflag & = ~ Parenb; new_cfg.c_iflag & = ~ Inpck;} break; Case 'O': {new_cfg.c_cflag | = (parodd | parenb); new_cfg.c_iflag | = inpck;} break; Case 'E ': case 'E': {new_cfg.c_cflag | = parenb; new_cfg.c_cflag & = ~ Parodd; new_cfg.c_iflag | = inpck;} break; Case's ': {new_cfg.c_cflag & = ~ Parenb; new_cfg.c_cflag & = ~ Cstopb;} break;} switch (stopbits) {default: Case '1': {new_cfg.c_cflag & = ~ Cstopb;} break; Case '2': {new_cfg.c_cflag | = cstopb;} break;}/* Set wait time */new_cfg.c_cc [vtime] = 0; new_cfg.c_cc [Vmin] = 1; tcflush (comfd, tciflush); If (tcsetattr (comfd, tcsanow, & new_cfg) <0) {perror ("tcsetattr "); return-1;} printf ("open and set serial OK, % d \ n", comfd); Return comfd;} int serialcom: serialcomclose () {close (comfd ); stat = 0; return Stat;}/*> 0 file descriptor readable, = 0 timeout <0 undescriptor readable */INT serialcom: checkserialcomdata () {fd_set rset; struct timevaltv; int ret; fd_zero (& rset); fd_set (comfd, & rset); TV. TV _sec = USEC; TV. TV _usec = 0; ret = select (comfd + 1, & rset, null, null, & TV); If (Ret> 0) printf ("check have data \ n "); return ret;} int serialcom: serialcomread (char * pbuffer, int datalen) {int ret; ret = read (comfd, pbuffer, datalen); return ret;} int serialcom :: serialcomwrite (char * pbuffer, int datalen) {int ret; ret = write (comfd, pbuffer, datalen); If (Ret> 0) printf ("serialcomwrite pbuffer = % s \ n", pbuffer); return ret ;}
}; # Endif