linux 串口应用程序.docxVIP

/* * Program: serial.c * Author: Paul Dean * Version: 0.0.3 * Date: 2002-02-19 * Description: To provide underlying serial port function, * for high level applications. **/#include termios.h /* tcgetattr, tcsetattr */#include stdio.h /* perror, printf, puts, fprintf, fputs */#include unistd.h /* read, write, close */#include fcntl.h /* open */#include sys/signal.h#include sys/types.h#include string.h /* bzero, memcpy */#include limits.h /* CHAR_MAX */#include serial.h/* * Decription for TIMEOUT_SEC(buflen,baud); * baud bits per second, buflen bytes to send. * buflen*20 (20 means sending an octect-bit data by use of the maxim bits 20) * eg. 9600bps baudrate, buflen=1024B, then TIMEOUT_SEC = 1024*20/9600+1 = 3 * dont change the two lines below unless you do know what you are doing.*/#define TIMEOUT_SEC(buflen,baud) (buflen*20/baud+2)#define TIMEOUT_USEC 0#define CH_TO_WAIT 5#define CH_BITS 11#define BUFFER_LEN 1024 /* sendfile() */static INT32 fd; //File descriptor for the portstatic struct termios termios_old, termios_new;static fd_set fs_read, fs_write;static struct timeval tv_timeout;static void set_baudrate (INT32);static INT32 get_baudrate ();static void set_data_bit (INT32 databit);static INT32 baudrate2Bxx (INT32 baudrate);static INT32 Bxx2baudrate (INT32 _baudrate);static INT32 set_port_attr ( INT32 baudrate, // INT32 databit, const char *stopbit, char parity);static void set_stopbit (const char *stopbit);static void set_parity (char parity);/* Open serial port ComPort at baudrate baud rate. */INT32 OpenComPort (INT32 ComPort, INT32 baudrate, INT32 databit, const char *stopbit, char parity){ char *pComPort; INT32 retval; switch (ComPort) { case 0: pComPort = /dev/ttyO0; break; case 1: pComPort = /dev/ttyO1; break; case 2: pComPort = /dev/ttyO2; break; case 3: pComPort = /dev/ttyO3; break; case 4: pComPort = /dev/ttyO4; break; case 5: pComPort = /dev/ttyO5;