I have the following code, and the StopWatch object, when I try to restart it, it throws this exception:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt
The code is as follows:
public sealed partial class MainPage : Page { private const int ECHO_PIN = 23; private const int TRIGGER_PIN = 18; private GpioPin pinEcho; private GpioPin pinTrigger; private DispatcherTimer timer; private Stopwatch sw; public MainPage() { this.InitializeComponent(); InitGPIO(); timer = new DispatcherTimer(); timer.Interval = TimeSpan.FromMilliseconds(400); timer.Tick += Timer_Tick; if (pinEcho != null && pinTrigger != null) { timer.Start(); } } private async void Timer_Tick(object sender, object e) { pinTrigger.Write(GpioPinValue.High); await Task.Delay(10); pinTrigger.Write(GpioPinValue.Low); while (pinEcho.Read() == GpioPinValue.Low) { sw.Restart(); } while (pinEcho.Read() == GpioPinValue.High) { } sw.Stop(); var elapsed = sw.Elapsed.TotalSeconds; var distance = elapsed * 34000; distance /= 2; distancetb.Text = "Distance: " + distance + " cm"; } private async void InitGPIO() { var gpio = GpioController.GetDefault(); if (gpio == null) { pinEcho = null; pinTrigger = null; gpioStatus.Text = "no hay controlador GPIO en este dispositivo"; retu; } pinEcho = gpio.OpenPin(ECHO_PIN); pinTrigger = gpio.OpenPin(TRIGGER_PIN); pinTrigger.SetDriveMode(GpioPinDriveMode.Output); pinEcho.SetDriveMode(GpioPinDriveMode.Input); gpioStatus.Text = "controlador GPIO inicializado"; pinTrigger.Write(GpioPinValue.Low); await Task.Delay(100); } }