linux串口字节时间间隔

#include <stdio.h>
#include <time.h>

void measure_interval() {
    struct timespec start, end;
    clock_gettime(CLOCK_MONOTONIC, &start);
    // 模拟串口数据接收
    // ...
    clock_gettime(CLOCK_MONOTONIC, &end);
    long seconds = end.tv_sec - start.tv_sec;
    long nanoseconds = end.tv_nsec - start.tv_nsec;
    double elapsed = seconds + nanoseconds * 1e-9;
    printf("Elapsed time: %f seconds\n", elapsed);
}

#include <fcntl.h>
#include <unistd.h>
#include <termios.h>

int setup_serial_port(const char* port, speed_t baud_rate) {
    int fd = open(port, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) return -1;

    struct termios options;
    tcgetattr(fd, &options);
    cfsetispeed(&options, baud_rate);
    cfsetospeed(&options, baud_rate);
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_oflag &= ~OPOST;
    tcsetattr(fd, TCSANOW, &options);

    return fd;
}