uart

#define TERMINAL    "/dev/ttyS2"

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

int set_interface_attribs(int fd, int speed)
{
    struct termios tty;

    if (tcgetattr(fd, &tty) < 0) {
        printf("Error from tcgetattr: %s\n", strerror(errno));
        return -1;
    }

    cfsetospeed(&tty, (speed_t)speed);
    cfsetispeed(&tty, (speed_t)speed);

    tty.c_cflag |= (CLOCAL | CREAD);    /* ignore modem controls */
    tty.c_cflag &= ~CSIZE;
    tty.c_cflag |= CS8;         /* 8-bit characters */
    tty.c_cflag &= ~PARENB;     /* no parity bit */
    tty.c_cflag &= ~CSTOPB;     /* only need 1 stop bit */
    tty.c_cflag &= ~CRTSCTS;    /* no hardware flowcontrol */

    /* setup for non-canonical mode */
    tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
    tty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
    tty.c_oflag &= ~OPOST;

    /* fetch bytes as they become available */
    tty.c_cc[VMIN] = 1;
    tty.c_cc[VTIME] = 1;

    if (tcsetattr(fd, TCSANOW, &tty) != 0) {
        printf("Error from tcsetattr: %s\n", strerror(errno));
        return -1;
    }
    return 0;
}

void set_mincount(int fd, int mcount)
{
    struct termios tty;

    if (tcgetattr(fd, &tty) < 0) {
        printf("Error tcgetattr: %s\n", strerror(errno));
        return;
    }

    tty.c_cc[VMIN] = mcount ? 1 : 0;
    tty.c_cc[VTIME] = 5;        /* half second timer */

    if (tcsetattr(fd, TCSANOW, &tty) < 0)
        printf("Error tcsetattr: %s\n", strerror(errno));
}


int main()
{
    char *portname = TERMINAL;
    int fd;
    int wlen;
    char *xstr = "Hello!\n";
    int xlen = strlen(xstr);

    //  FILE *fp;
//  fp = fopen("out.txt", "w");
    fd = open(portname, O_RDWR | O_NOCTTY | O_SYNC);
    if (fd < 0) {
        printf("Error opening %s: %s\n", portname, strerror(errno));
        return -1;
    }
    /*baudrate 115200, 8 bits, no parity, 1 stop bit */
    set_interface_attribs(fd, B115200);
   // set_mincount(fd, 0);                /* set to pure timed read */

    /* simple output */
    wlen = write(fd, xstr, xlen);
    if (wlen != xlen) {
        printf("Error from write: %d, %d\n", wlen, errno);
    }
    tcdrain(fd);    /* delay for output */


    /* simple noncanonical input */
   // do {
        unsigned char buf[80];
    //  unsigned char MeasData[512];
        int rdlen;
        int i, time, offset, date, p, buffsize;
        unsigned short lambda, type, pages;
        float Yvalue;
        rdlen = read(fd, buf, sizeof(buf) - 1);

        if (((int)buf[0]==122)&&((int)buf[2])==20)
        {

        printf("LD 07....OK \n");
        pages = *(unsigned short *)(&buf[12]);
        printf("PAGES TO READ %d\n", pages);


        //unsigned char MeasData[512*4096];
        //unsigned char * MeasData = ( unsigned char * )malloc( 512*pages * sizeof( unsigned char ) );
        unsigned char MeasData[512*pages];
    //  unsigned char *MeasData = malloc(sizeof(unsigned char)*(512*pages));

        for (i=0;i<512*pages; i++)
       {

        rdlen = read(fd, buf, sizeof(buf)-1);
        MeasData[i] = buf[12];

        }

        for (i=0; i<512*pages; i++)

        {
        date     = *(int *)(&MeasData[0+offset]);
        time     = *(int *)(&MeasData[4+offset]);
        lambda   = *(unsigned short *)(&MeasData[8+offset]);
        Yvalue   = *(float *)(&MeasData[12+offset]);
        type     = *(unsigned short*)(&MeasData[16+offset]) ;

        printf("Date: %02d.%02d", (date&0xFF),((date>>8)&0xFF));
        printf(" Time: %02d:%02d:%02d", ((time>>16)&0xFF),((time>>8)&0xFF),(time&0xFF));
        printf(" λ: 0.%d:", lambda);
        printf(" Yvalue: %f", Yvalue);
        printf(" type: %d", type);
        printf("\n");
        offset += 32;
        }
        //fwrite(&MeasData, sizeof(MeasData), 1, fp);
        //fclose(fp);

        if (rdlen > 0) {
            /* display hex */
          //  unsigned char   *p;
         //   printf("Read %d:", rdlen);
         //  for (p = buf; rdlen-- > 0; p++)
            //  printf(" 0x%x", *p);
        //      printf("\n");



        } else if (rdlen < 0) {
            printf("Error from read: %d: %s\n", rdlen, strerror(errno));
        } else {  /* rdlen == 0 */
            printf("Timeout from read\n");
        }
        /* repeat read to get full message */
  // } //while (1);
        }else
        {
            printf ("Restart App\n");
        }

}