麒麟操作系统接入串口转USB设备

1 将串口转USB设备的usb口插入麒麟主机，打开麒麟主机终端，执行 cd /dev 会产生一个文件夹serial，如果只有一个串口，串口名称为/dev/ttyUSB0，ll /dev/ttyUSB0 查看设备信息

2 写java程序接入

<dependency>
    <groupId>com.fazecast</groupId>
    <artifactId>jSerialComm</artifactId>
    <version>2.9.0</version>
</dependency>

编写程序

public class ReadSer{
        StringBuilder sb = new StringBuilder();
        public static void main(String[] args) {

                SerialPort serialPort = SerialPort.getCommPort("/dev/ttyUSB0"); // 替换为你的串口名称
                         

        try {
            // 配置串口参数
            serialPort.setComPortParameters(115200, 8, 1, 0);
            if (serialPort.openPort()) {
                log.info("串口已打开: " + serialPort.getSystemPortName());
            } else {
                log.info("串口打开失败: " + serialPort.getSystemPortName());
                return;
            }
            // 读取数据
            byte[] buffer = new byte[1024];


            while(true){
                int bytesRead = serialPort.readBytes(buffer, buffer.length);
                log.info("接收到数据大小：" + bytesRead);
                if (bytesRead > 0) {
                    List<String> str = new ArrayList<>();
                    sb.delete(0, sb.length());
                    for (int i = 0; i < bytesRead; i++) {
                        sb.append(String.format("%02x", buffer[i]&0xFF));
                    }
                    String value = sb.toString();
                    log.info("接收到数据，转换成16进制：" + value);
                    byte[] aByte = CRC8.getByte(value.substring(0, value.length() - 4));
                    int compute = CRC8.compute(aByte);
                    int crc = buffer[bytesRead - 2] & 0xFF;
                    if (compute != crc) {
                        log.info("接收到数据不正确，丢弃");
                        continue;
                    }
                }
                Thread.sleep(1000);
            }

        } catch (Exception e) {
            log.error("串口失败", e);
            log.info("串口失败，" + e.getMessage());
            if(serialPort.isOpen()){
                serialPort.closePort();
            }

        }finally{
            if(serialPort.isOpen()){
                serialPort.closePort();
            }
        }
     }
}

执行程序会报串口打开失败，原因是设备权限的问题

sudo usermod -aG dilout username 可解决