uartwolf.c

#include <unistd.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>

#define BAUDRATE B9600
#define MODEMDEVICE "/dev/ttyAMA0"
#define _POSIX_SOURCE 1 /* POSIX compliant source */
#define FALSE 0
#define TRUE 1

volatile int STOP = FALSE;

main()
{
    int fd, c, res;
    struct termios oldtio, newtio;
    char buf[255];

    fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY);
    if (fd < 0) {
        perror(MODEMDEVICE);
        exit(-1);
    }

    tcgetattr(fd, &oldtio); /* save current port settings */

    bzero(&newtio, sizeof(newtio));
    newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;
    newtio.c_iflag = IGNPAR;
    newtio.c_oflag = 0;

    /* set input mode (non-canonical, no echo,...) */
    newtio.c_lflag = 0;

    newtio.c_cc[VTIME] = 0; /* inter-character timer unused */
    newtio.c_cc[VMIN] = 244; /* blocking read until 5 chars received */

    tcflush(fd, TCIFLUSH);
    tcsetattr(fd, TCSANOW, &newtio);

    while (STOP == FALSE) { /* loop for input */
        res = read(fd, buf, 255); /* returns after 5 chars have been input */
        uint16_t lol = *(uint16_t*)buf;
        printf("%d, ID: %u\n", res, lol);
        //usleep(500);
    }
    tcsetattr(fd, TCSANOW, &oldtio);
}

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