串口发送十六进制数字

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <termios.h>

#include <errno.h>



int main(int argc, char **argv)

{

    int fd;

    int i,k;

    int nwrite,nread;

    struct termios opt;

    unsigned char read_buff[256];

    unsigned char write_buff[]={0x02,0x00,0x00,0x04,0x15,0x10,0x03,0x1C,0x03};

    int len=9;



    fd = open("/dev/ttyS5", O_RDWR | O_NOCTTY); //×è·

    if(fd == -1)

        perror("open serial 0\n");



    tcgetattr(fd, &opt);

    cfsetispeed(&opt, B19200);

    cfsetospeed(&opt, B19200);



    if(tcsetattr(fd, TCSANOW, &opt) != 0 )

    {

        perror("tcsetattr error");

     return -1;

    }



    opt.c_cflag &=~CSIZE;

    opt.c_cflag |= CS8;

    opt.c_cflag &=~CSTOPB;

    opt.c_cflag &=~PARENB;

    opt.c_cflag &=~INPCK;

    opt.c_cflag |= (CLOCAL | CREAD);



    opt.c_lflag &=~(ICANON | ECHO | ECHOE | ISIG);



    opt.c_oflag &=~OPOST;



    opt.c_iflag &=~ICRNL;

    opt.c_iflag &=~INLCR;



    opt.c_cc[VTIME] = 0;

    opt.c_cc[VMIN] = 0;



    tcflush(fd, TCIOFLUSH);



    printf("configure complete\n");



    if(tcsetattr(fd, TCSANOW, &opt) != 0)

    {

        perror("serial error");

        return -1;

    }

    printf("start send and receive data\n");





    //for(i=0;i<len;i++)

    //{

        nwrite = write(fd, write_buff, 9);



    //    if(nwrite!=1)

    //    {

    //    printf("Send error!\n");

    //    break;

    //    }

    //    else



    printf("SEND: ");

    for(i=0;i<len;i++)

    {

        {

            printf("%02X ",write_buff[i]);

        }

        //for(k=0;k<0xfffff;k++);

    }

    printf("\n");



    while(1)

    {

        while((nread = read(fd,read_buff,256))>0)

        {

            printf("\nREAD Len %d\n", nread);

        //    read_buff[nread+1]='\0';

        //    printf("\nread: %s",read_buff);

            printf("READ: %02X %02X %02X %02X %02X %02X %02X %02X %02X\n",

                    read_buff[0],

                    read_buff[1],

                    read_buff[2],

                    read_buff[3],

                    read_buff[4],

                    read_buff[5],

                    read_buff[6],

                    read_buff[7],

                    read_buff[8]);



        }

    }



    close(fd);

}