Linux c 开发-15 Ubuntu子系统中使用串口

Wsl2无法使用串口,open成功，但是set_opt一直通不过，没办法，最近暂时不使用docker,只能切换回Wsl1了

wsl -l -v

wsl --set-version Ubuntu-20.04 1

#include      /*标准输入输出定义*/
#include     /*标准函数库定义*/
#include     /*Unix 标准函数定义*/
#include 
#include  
#include      /*文件控制定义*/
#include    /*POSIX 终端控制定义*/
#include      /*错误号定义*/
#include       /*字符串功能函数*/
int set_opt(int fd, int nSpeed, int nBits, char nEvent, int nStop);
int main()
{
	int fd, nByte;
	char* uart3 = "/dev/ttyS2";
	char* uart_out = "请输入:\n";
	char buff[512];
	memset(buff, 0, sizeof(buff));
	if ((fd = open(uart3, O_RDWR | O_NOCTTY)) < 0)
	{
		printf("打开失败\n");
	}
	else
	{
		set_opt(fd, 115200, 8, 'N', 1);
		write(fd, uart_out, strlen(uart_out));
		while (1)
		{
			while ((nByte = read(fd, buff, 512)) > 0)
			{
				buff[nByte + 1] = '\0';
				write(fd, buff, strlen(buff));
				memset(buff, 0, strlen(buff));
				nByte = 0;
			}
		}
	}
}

int set_opt(int fd, int nSpeed, int nBits, char nEvent, int nStop)
{
	struct termios newtio, oldtio;
	if (tcgetattr(fd, &oldtio) != 0) {  //检测串口是否可用
		perror("SetupSerial 1");
		return -1;
	}
	bzero(&newtio, sizeof(newtio));
	newtio.c_cflag |= CLOCAL | CREAD;
	newtio.c_cflag &= ~CSIZE;

	switch (nBits) //设置数据位
	{
	case 7:
		newtio.c_cflag |= CS7;
		break;
	case 8:
		newtio.c_cflag |= CS8;
		break;
	}

	switch (nEvent)//设置检验位
	{
	case 'O':
		newtio.c_cflag |= PARENB;
		newtio.c_cflag |= PARODD;
		newtio.c_iflag |= (INPCK | ISTRIP);
		break;
	case 'E':
		newtio.c_iflag |= (INPCK | ISTRIP);
		newtio.c_cflag |= PARENB;
		newtio.c_cflag &= ~PARODD;
		break;
	case 'N':
		newtio.c_cflag &= ~PARENB;
		break;
	}

	switch (nSpeed) //设置波特率
	{
	case 2400:
		cfsetispeed(&newtio, B2400);
		cfsetospeed(&newtio, B2400);
		break;
	case 4800:
		cfsetispeed(&newtio, B4800);
		cfsetospeed(&newtio, B4800);
		break;
	case 9600:
		cfsetispeed(&newtio, B9600);
		cfsetospeed(&newtio, B9600);
		break;
	case 115200:
		cfsetispeed(&newtio, B115200);
		cfsetospeed(&newtio, B115200);
		break;
	case 460800:
		cfsetispeed(&newtio, B460800);
		cfsetospeed(&newtio, B460800);
		break;
	default:
		cfsetispeed(&newtio, B9600);
		cfsetospeed(&newtio, B9600);
		break;
	}
	if (nStop == 1)//设置停止位
		newtio.c_cflag &= ~CSTOPB;
	else if (nStop == 2)
		newtio.c_cflag |= CSTOPB;
	newtio.c_cc[VTIME] = 0;
	newtio.c_cc[VMIN] = 0;
	tcflush(fd, TCIFLUSH);
	if ((tcsetattr(fd, TCSANOW, &newtio)) != 0) //设置串口参数
	{
		perror("com set error");
		return -1;
	}

	//	printf("set done!\n\r");
	return 0;
}

 执行成功