/// <summary>
        /// Allocates the specified pin.
        /// </summary>
        /// <param name="pin">The pin.</param>
        /// <param name="direction">The direction.</param>
        public void Allocate(ProcessorPin pin, PinDirection direction)
        {
            var gpioId = string.Format("gpio{0}", (int)pin);

            if (Directory.Exists(Path.Combine(gpioPath, gpioId)))
            {
                HelperFileStream.SaveToFile(Path.Combine(gpioPath, "unexport"), (int)pin);
            }

            // Export pin for file mode
            HelperFileStream.SaveToFile(Path.Combine(gpioPath, "export"), (int)pin);

            // Set the direction on the pin and update the exported list
            SetPinMode(pin, direction == PinDirection.Input ? Interop.BCM2835_GPIO_FSEL_INPT : Interop.BCM2835_GPIO_FSEL_OUTP);

            // Set direction in pin virtual file
            var filePath = Path.Combine(gpioId, "direction");

            HelperFileStream.SaveToFile(Path.Combine(gpioPath, filePath), direction == PinDirection.Input ? "in" : "out");

            if (direction == PinDirection.Input)
            {
                PinResistor pinResistor;
                if (!pinResistors.TryGetValue(pin, out pinResistor) || pinResistor != PinResistor.None)
                {
                    SetPinResistor(pin, PinResistor.None);
                }

                SetPinDetectedEdges(pin, PinDetectedEdges.Both);
                InitializePoll(pin);
            }
        }
        /// <summary>
        /// Releases the specified pin.
        /// </summary>
        /// <param name="pin">The pin.</param>
        public void Release(ProcessorPin pin)
        {
            UninitializePoll(pin);
            HelperFileStream.SaveToFile(Path.Combine(gpioPath, "unexport"), (int)pin);

            SetPinMode(pin, Interop.BCM2835_GPIO_FSEL_INPT);
        }
Exemplo n.º 3
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        /// <summary>
        /// Allocates the specified pin.
        /// </summary>
        /// <param name="pin">The pin.</param>
        /// <param name="direction">The direction.</param>
        public void Allocate(ProcessorPin pin, PinDirection direction)
        {
            Release(pin);

            HelperFileStream.SaveToFile(Path.Combine(gpioPath, "export"), (int)pin);

            if (!gpioPathList.ContainsKey(pin))
            {
                var gpio = new FileGpioHandle {
                    GpioPath = GuessGpioPath(pin)
                };
                gpioPathList.Add(pin, gpio);
            }

            var filePath = Path.Combine(gpioPathList[pin].GpioPath, "direction");

            try {
                SetPinDirection(filePath, direction);
            }
            catch (UnauthorizedAccessException) {
                // program hasn't been started as root, give it a second to correct file permissions
                Thread.Sleep(TimeSpan.FromSeconds(1));
                SetPinDirection(filePath, direction);
            }

            gpioPathList[pin].GpioStream = new FileStream(Path.Combine(GuessGpioPath(pin), "value"), FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
        }
Exemplo n.º 4
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 /// <summary>
 /// Releases the specified pin.
 /// </summary>
 /// <param name="pin">The pin.</param>
 public void Release(ProcessorPin pin)
 {
     if (gpioPathList.ContainsKey(pin) && gpioPathList[pin].GpioStream != null)
     {
         gpioPathList[pin].GpioStream.Flush();
         gpioPathList[pin].GpioStream = null;
     }
     if (Directory.Exists(GuessGpioPath(pin)))
     {
         HelperFileStream.SaveToFile(Path.Combine(gpioPath, "unexport"), (int)pin);
     }
 }
        /// <summary>
        /// Sets the detected edges on an input pin.
        /// </summary>
        /// <param name="pin">The pin.</param>
        /// <param name="edges">The edges.</param>
        /// <remarks>By default, both edges may be detected on input pins.</remarks>
        public void SetPinDetectedEdges(ProcessorPin pin, PinDetectedEdges edges)
        {
            var edgePath = Path.Combine(gpioPath, string.Format("gpio{0}/edge", (int)pin));

            HelperFileStream.SaveToFile(edgePath, ToString(edges));
        }
Exemplo n.º 6
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 private static void SetPinDirection(string fullFilePath, PinDirection direction)
 {
     HelperFileStream.SaveToFile(fullFilePath, direction == PinDirection.Input
                            ? "in"
                            : "out");
 }