怎么用c语言编程序截取串口数据

时间:2025-01-25 11:42:09 游戏攻略

在C语言中,可以使用以下步骤来截取串口数据:

引入头文件

```c

include

include

include

include

include

include

include

```

打开串口

```c

int serial_fd = open("/dev/ttyS0", O_RDWR);

if (serial_fd == -1) {

perror("无法打开串口");

exit(1);

}

```

配置串口

```c

struct termios options;

tcgetattr(serial_fd, &options);

cfsetispeed(&options, B9600); // 设置波特率为9600

cfsetospeed(&options, B9600);

options.c_cflag |= (CLOCAL | CREAD); // 启用接收和本地模式

options.c_cflag &= ~PARENB; // 无校验位

options.c_cflag &= ~CSTOPB; // 1个停止位

options.c_cflag &= ~CSIZE; // 数据位掩码

options.c_cflag |= CS8; // 8个数据位

tcsetattr(serial_fd, TCSANOW, &options);

```

读取串口数据

```c

char buffer[MAX_BUFF_SIZE];

while (1) {

int nread = read(serial_fd, buffer, MAX_BUFF_SIZE - 1);

if (nread == -1) {

perror("读取串口数据失败");

exit(1);

} else if (nread == 0) {

printf("串口已关闭\n");

break;

}

buffer[nread] = '\0';

printf("接收到的数据: %s\n", buffer);

}

```

关闭串口

```c

close(serial_fd);

```

示例代码

```c

include

include

include

include

include

include

include

define MAX_BUFF_SIZE 256

int main() {

int serial_fd = open("/dev/ttyS0", O_RDWR);

if (serial_fd == -1) {

perror("无法打开串口");

exit(1);

}

struct termios options;

tcgetattr(serial_fd, &options);

cfsetispeed(&options, B9600); // 设置波特率为9600

cfsetospeed(&options, B9600);

options.c_cflag |= (CLOCAL | CREAD); // 启用接收和本地模式

options.c_cflag &= ~PARENB; // 无校验位

options.c_cflag &= ~CSTOPB; // 1个停止位

options.c_cflag &= ~CSIZE; // 数据位掩码

options.c_cflag |= CS8; // 8个数据位

tcsetattr(serial_fd, TCSANOW, &options);

char buffer[MAX_BUFF_SIZE];

while (1) {

int nread = read(serial_fd, buffer, MAX_BUFF_SIZE - 1);

if (nread == -1) {

perror("读取串口数据失败");

exit(1);

} else if (nread == 0) {

printf("串口已关闭\n");

break;

}

buffer[nread] = '\0';

printf("接收到的数据: %s\n", buffer);

}

close(serial_fd);

return 0;

}

```

注意事项

串口设备路径:

`/dev/ttyS0` 或 `/