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[英]Azure DevOps dotnet build doesn't have access to nuget packages
[英]dotnet core webapp doesn't have gpio access
我正在尝试使aspnet核心web应用程序在我的树莓派上运行。 该应用程序使用Bifrost与树莓的GPIO进行交互,但是每次我sudo dotnet run
它都会因错误而失败
Using launch settings from /home/pi/Desktop/keypad-alarm/keypad-alarm-server/Properties/launchSettings.json...
Write value High to pin at /sys/class/gpio/gpio17/value
Unhandled Exception: System.UnauthorizedAccessException: Access to the path '/sys/class/gpio/gpio17/value' is denied. ---> System.IO.IOException: Operation not permitted
--- End of inner exception stack trace --- at
System.IO.FileStream.WriteNative(ReadOnlySpan`1 source) at
System.IO.FileStream.FlushWriteBuffer() at
System.IO.FileStream.FlushInternalBuffer() at
System.IO.FileStream.Flush(Boolean flushToDisk) at
System.IO.FileStream.Flush() at
System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at
System.IO.StreamWriter.Dispose(Boolean disposing) at
System.IO.TextWriter.Dispose()
at System.IO.File.WriteAllText(String path, String contents) at
Bifrost.Devices.Gpio.GpioPin.Write(GpioPinValue pinValue) at
keypad_alarm_server.TweetController.Tweet(Int32 milliseconds) in
/home/pi/Desktop/keypad-alarm/keypad-alarm-server/TweetController.cs:line 25 at
keypad_alarm_server.Program.Main(String[] args) in /home/pi/Desktop/keypad-alarm/keypad-alarm-server/Program.cs:line 15
我应该提到的是,我什至在Program.cs中启动Web服务器之前,立即将GPIO 17设置为高电平以发出蜂鸣声。
如何确保dotnet具有访问gpio的足够权限?
好的,像往常一样,在花了一些时间发布问题之后,您可以在某处找到答案...
未经授权的pin.SetDriveMode(GpioPinDriveMode.Output);
非常令人误解,因为在c#中缺少以下语句: pin.SetDriveMode(GpioPinDriveMode.Output);
public class TweetController
{
private static IGpioController _gpio = null;
private const int PIN = 17;
public TweetController()
{
_gpio = GpioController.Instance;
}
public void Tweet(int milliseconds){
var pin = _gpio.OpenPin(PIN);
pin.SetDriveMode(GpioPinDriveMode.Output); // open the gpio pin before writing or unauthorizedexception occurs
pin.Write(GpioPinValue.High);
Thread.Sleep(milliseconds);
pin.Write(GpioPinValue.Low);
}
}
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