如何從串口讀取GPS數據

Question

我正在嘗試從 BU-353S4 USB GPS 讀取來自串行端口的數據。 就可讀的 NMEA 句子而言，我一無所獲。 GPS 與 Raspberry Pi 完美搭配。

這適用於 .NET 控制台應用程序。 web 中到處都有類似的問題，但似乎沒有一個示例有效。

var port = new SerialPort
{
    PortName = "COM5",
    BaudRate = 4800,
    Parity = Parity.None,
    DataBits = 8,
    StopBits = StopBits.One,
};
port.DataReceived += Port_DataReceived;


private static void Port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    string line = "";
    SerialPort port = (SerialPort)sender;
    line = port.ReadExisting();
    Console.Write(line);
}

和...

private static void Port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort port = (SerialPort)sender;
    var count = port.BytesToRead;
    var buffer = new byte[count];
    port.Read(buffer, 0, count);
    var line = Encoding.ASCII.GetString(buffer);
    Console.Write(line);
}

無論我嘗試什么，我都會得到類似的結果：

?)))))(((((#Y?""???????? ??z ?----------?D??

?J?&%%%%%%%%%?? ?%$$$$$$$$$f Qx?++++******?? ? ? #???? ) xm???? =?? ? ？？？ ？？？ ]？ 噸？ D0?? ？？？ 3 4?? 2\

Answer 1

原來 GPS 發送的是 SiRF 而不是 NMEA。 一旦我按照此 SuperUser 帖子中的步驟將其切換到 NMEA，一切正常！

Answer 2

這個問題與波特率有關。 嘗試將您的值更改為與您的設備兼容的值。

我收到了這個錯誤，這就是我為解決這個問題所做的：

_GPSReceiver = new SerialPort("COM9");
_GPSReceiver.ReceivedBytesThreshold = 1024;
_GPSReceiver.ReadTimeout = 5000;
_GPSReceiver.BaudRate = 4800;
_GPSReceiver.Parity = Parity.None;
_GPSReceiver.StopBits = StopBits.One;
_GPSReceiver.DataBits = 7;
_GPSReceiver.Handshake = Handshake.None;
_GPSReceiver.Encoding = ASCIIEncoding.ASCII;

_GPSReceiver.DataReceived += new SerialDataReceivedEventHandler(GPSReceiver_DataReceived);
_GPSReceiver.Open();