comv1.4.c

linux下串口发送程序

#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <pthread.h>

/**********************************************************/

void com2_ini(void);
volatile int fd;
struct termios option;
int OpenDev(char *Dev);
int  send (char * data, int count);

/**********************************************************/

int main(int argc, char **argv){
	char buff[256]="hello world!";
	char *dev  = "/dev/ttyS1"; //串口2
	fd = OpenDev(dev);
        com2_ini(); 
        write(fd, buff, 256);
	close(fd);  
//	exit (0);
}
void com2_ini(void)
{
        //**********************************************************
        //波特率设置
        //*********************************************************
        tcgetattr(fd,&option); /* save current modem settings */
        cfsetispeed(&option,B9600); /*设置为9600Bps*/
        cfsetospeed(&option,B9600);
        tcsetattr(fd,TCSANOW,&option);
        //**********************************************************
        //无效验， 8 位
        //*********************************************************
        option.c_cflag &= ~PARENB;
        option.c_cflag &= ~CSTOPB;
        option.c_cflag &= ~CSIZE;
        option.c_cflag |= ~CS8;
        //**********************************************************
        //  1  位停止位
        //*********************************************************
        option.c_cflag &= ~CSTOPB;
        //**********************************************************
        //    原始模式(Raw Mode)方式来通讯
        //*********************************************************
        option.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /*Input*/
        option.c_oflag &= ~OPOST;
}
int OpenDev(char *Dev)
{
	int	fd = open( Dev, O_RDWR );  //| O_NOCTTY | O_NDELAY	
	if (-1 == fd)	
	{ 			
		perror("Can't Open Serial Port");
		return -1;		
	}	
	else	
		return fd;
}
/*Notice:运行时出现 "No such file or directory"
                    cd /dev
                    ln -sf /dev/tts/0 ttyS0*/