[原创] 【Luckfox幸狐 RV1106 Linux 开发板测评】07 串口设备应用

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

int main() {
    int serial_port_num;
    char serial_port[15];
    
    printf("Select a serial port (0/1/3/4): ");
    scanf("%d", &serial_port_num);
    
    sprintf(serial_port,"/dev/ttyS%d",serial_port_num);
    int serial_fd;

    serial_fd = open(serial_port, O_RDWR | O_NOCTTY);
    if (serial_fd == -1) {
        perror("Failed to open serial port");
        return 1;
    }

    struct termios tty;
    memset(&tty, 0, sizeof(tty));

    if (tcgetattr(serial_fd, &tty) != 0) {
        perror("Error from tcgetattr");
        return 1;
    }
    int bt_num =3;
    
    int baud_val=B115200;
    
    printf(" baud rate select is \n 1:   9600 \n 2:  19200\n 3:  38400\n 4:  57600\n 5: 115200\n");
    scanf("%d", &bt_num);
    switch(bt_num)
    {
        case 1:
            cfsetospeed(&tty, B9600);
            cfsetispeed(&tty, B9600);  
            baud_val =9600;
            break;
        case 2:
            cfsetospeed(&tty, B19200);
            cfsetispeed(&tty, B19200);  
            baud_val =19200;
            break;
        case 3:
            cfsetospeed(&tty, B38400);
            cfsetispeed(&tty, B38400);  
            baud_val =38400;
            break;
        case 4:
            cfsetospeed(&tty, B57600);
            cfsetispeed(&tty, B57600);  
            baud_val =57600;
            break;
        case 5:
            cfsetospeed(&tty, B115200);
            cfsetispeed(&tty, B115200);  
            baud_val =115200;
            break;
          default:
            cfsetospeed(&tty, B115200);
            cfsetispeed(&tty, B115200);  
            baud_val =B115200;
            break;  
    }              
    printf("baud rate is %d\n",baud_val);
    tty.c_cflag &= ~PARENB;
    tty.c_cflag &= ~CSTOPB;
    tty.c_cflag &= ~CSIZE;
    tty.c_cflag |= CS8;

    if (tcsetattr(serial_fd, TCSANOW, &tty) != 0) {
        perror("Error from tcsetattr");
        return 1;
    }

    char tx_buffer[] = "please send data\n";
    int tims=10;
    while(tims){
        tims--;
        ssize_t bytes_written = write(serial_fd, tx_buffer, sizeof(tx_buffer));
        if (bytes_written < 0) {
            perror("Error writing to serial port");
            close(serial_fd);
            return 1;
        }
        printf("\rtx_buffer: \n %s ", tx_buffer);
        usleep(100000);
        char rx_buffer[256];
        int bytes_read = read(serial_fd, rx_buffer, sizeof(rx_buffer));
        if (bytes_read > 0) {
            rx_buffer[bytes_read] = '\0';
            printf("\rrx_buffer: \n %s ", rx_buffer);
        } else {
            printf("        \n");
        }
    }
    close(serial_fd);

    return 0;
}