Compile the c serial port program in linux: Infileincludedfromserial. c: 1: 0:

Compile the c serial port program in linux: Infileincludedfromserial. c: 1: 0: -- Linux general technology-Linux technology and application information. See the following for details. Serial Port program serial. c

CODE: # include "serial. h" Static struct termios termios_old, termios_new; // Set the serial communication rate Int _ BaudRate (int baudrate) { Switch (baudrate) { Case B2400: Return (2400 ); Case B4800: Return (4800 ); Case B9600: Return (9600 ); Case B19200: Return (19200 ); Case B38400: Return (38400 ); Case B57600: Return (57600 ); Case B115200: Return (115200 ); Default: Return (9600 ); } } Int BaudRate (int baudrate) { Switch (baudrate) { Case 0: Return (B2400 ); Case 1: Return (B4800 ); Case 2: Return (B9600 ); Case 3: Return (B19200 ); Case 4: Return (B38400 ); Case 5: Return (B57600 ); Case 6: Return (B115200 ); Default: Return (B9600 ); } } // Set parameters such as serial data bit, stop bit, parity bit, speed, and timeout setting Int setPara (int serialfd, int speed, int databits, int stopbits, int parity) { Bzero (& termios_new, sizeof (termios_new )); Cfmakeraw (& termios_new ); Termios_new.c_cflag = BaudRate (speed ); Termios_new.c_cflag | = CLOCAL | CREAD; Termios_new.c_cflag & = ~ CSIZE; Switch (databits) // sets the data bit { Case 0: Termios_new.c_cflag | = CS8; Break; Case 1: Termios_new.c_cflag | = CS7; Break; Case 2: Termios_new.c_cflag | = CS6; Break; Case 3: Termios_new.c_cflag | = CS5; Break; Default: Termios_new.c_cflag | = CS8; Break; } Switch (parity) // set the parity { Case 0: // as no parity Termios_new.c_cflag & = ~ PARENB; // Clear parity enable Break; Case 1: Termios_new.c_cflag | = PARENB; // Enable parity Termios_new.c_cflag & = ~ PARODD; Break; Case 2: Termios_new.c_cflag | = PARENB; Termios_new.c_cflag | = ~ PARODD; Break; Default: Termios_new.c_cflag & = ~ PARENB; // Clear parity enable Break; } Switch (stopbits) // set Stop Bit { Case 0: Termios_new.c_cflag & = ~ CSTOPB; Break; Case 1: Termios_new.c_cflag | = CSTOPB; Break; Default: Termios_new.c_cflag & = ~ CSTOPB; Break; } Tcflush (serialfd, TCIFLUSH); // Update the termios_new and do it NOW Termios_new.c_cc [VTIME] = 1;/* unit: 1/10 second .*/ Termios_new.c_cc [VMIN] = 1;/* minimal characters for reading */ Tcflush (serialfd, TCIFLUSH ); Return tcsetattr (serialfd, TCSANOW, & termios_new ); } Int nwrite (int serialfd, const char * data, int datalength) { Int len = 0, total_len = 0; // modify8.8 For (total_len = 0; total_len <datalength ;) { Len = 0; Len = write (serialfd, & data [total_len], datalength-total_len ); If (len> 0) Total_len + = len; } Return (total_len ); } Int GetBaudRate () { Return (_ BaudRate (cfgetospeed (& termios_new ))); } Void closePort (int serialfd) { Tcsetattr (serialfd, TCSADRAIN, & termios_old ); Close (serialfd ); } Int openPort (int index) { Char * device; Switch (index) { Case 0: Device = "/dev/ttyS0 "; Break; Case 1: Device = "/dev/ttyS1 "; Break; Case 2: Device = "/dev/ttyS2 "; Break; Case 3: Device = "/dev/ttyS3 "; Break; Default: Device = "/dev/ttyS0 "; } Int fd = open (device, O_RDWR | O_NOCTTY | O_NONBLOCK ); If (fd <0) { Return-1; } Tcgetattr (fd, & termios_old ); Return fd; }