linux串口uart编程

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

int open_uart(const char *port) {
    int fd = open(port, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("Failed to open serial port");
        return -1;
    }
    return fd;
}

void configure_uart(int fd, speed_t baud_rate) {
    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);
}

void send_data(int fd, const char *data, size_t length) {
    write(fd, data, length);
}

int read_data(int fd, char *buffer, size_t length) {
    return read(fd, buffer, length);
}

int main() {
    const char *port = "/dev/ttyUSB0";
    int fd = open_uart(port);
    if (fd == -1) {
        return 1;
    }

    configure_uart(fd, B9600);

    char send_buffer[] = "Hello, UART!";
    send_data(fd, send_buffer, sizeof(send_buffer) - 1);

    char recv_buffer[256];
    int bytes_read = read_data(fd, recv_buffer, sizeof(recv_buffer) - 1);
    if (bytes_read > 0) {
        recv_buffer[bytes_read] = '\0';
        printf("Received: %s\n", recv_buffer);
    }

    close(fd);
    return 0;
}