c# - .NET core 3.0 System.IO.Ports SerialPort始终在RPI上使用5-10％的CPU

Question

当我尝试在RaspberryPi上的Linux中从串行端口（uart）读取时，在循环中时，我总是会得到5-10％的CPU负载。由于SerialPorts应该被阻塞，因此不应使用那么多的CPU负载，否则我错了吗？

我尝试了两个代码：

简单代码

var port = new SerialPort("/dev/ttyUSB0", 57600);
port.Open();
while (true)
{
    if (port.BytesToRead > 0)
    {
    while (port.BytesToRead > 0)
        Console.Write($"{port.ReadByte().ToString("X2")} ");
    Console.WriteLine("");
    }
    Thread.Sleep(100);
}

进阶密码

static int blockLimit = 100;
static void Main(string[] args)
{
    var port = new SerialPort("/dev/ttyUSB0", 57600);
    port.Open();
    byte[] buffer = new byte[blockLimit];
    Action kickoffRead = null;
    kickoffRead = delegate
    {
        port.BaseStream.BeginRead(buffer, 0, buffer.Length, delegate (IAsyncResult ar)
        {
        try
        {
            int actualLength = port.BaseStream.EndRead(ar);
            byte[] received = new byte[actualLength];
            Buffer.BlockCopy(buffer, 0, received, 0, actualLength);
            raiseAppSerialDataEvent(received);
        }
        catch (IOException exc)
        {
            handleAppSerialError(exc);
        }
        kickoffRead();
        }, null);
    };
    kickoffRead();

    while (true)
        Thread.Sleep(1000);
}

private static void handleAppSerialError(IOException exc)
{
    throw new NotImplementedException();
}

private static void raiseAppSerialDataEvent(byte[] received)
{
    Console.WriteLine(BitConverter.ToString(received));
}

两者具有相同的结果：两个进程同时使用5％到10％的CPU负载


在运行 .NET Core 3.0 Preview 2的 System.IO.Ports 4.6.0-preview-19073.11上使用 RaspberryPi 3b+和 HypriotOS 1.10.0

Answer 1

到目前为止（NET Core 3.1），SerialPort实现非常占用CPU。我已经根据dima117的响应将Mono SerialPort移植到了Net Standard库中
.NET Core - Use System.IO.Ports.SerialPort in visual studio code

我已将其发布到github：

https://github.com/michaldobrodenka/System.IO.Ports.Mono

通过此SerialPort实施，我的全能型硬件H3的CPU使用率从25％下降至5％