Esempio n. 1
0
        /// <summary>
        /// Create a PwmChannel using a chip and channel.
        /// </summary>
        /// <remarks>Gpio pin 18 is on chip 0 and channel 0</remarks>
        public PwmChannel(int chip, int channel)
        {
            disposed = true;
            var chipPath = $"/sys/class/pwm/pwmchip{chip}";

            if (!Directory.Exists(chipPath))
            {
                throw new IOException($"Could not locate directory {chipPath}.");
            }
            var channelPath = $"{chipPath}/pwm{channel}";

            if (!Directory.Exists(channelPath))
            {
                Write($"{chipPath}/export", channel.ToString());
                Pi.Wait(100);
            }
            if (!Directory.Exists(channelPath))
            {
                throw new IOException($"Could not locate directory {channelPath}.");
            }
            var e = $"{channelPath}/enable";
            var p = $"{channelPath}/period";
            var d = $"{channelPath}/duty_cycle";

            if (!File.Exists(e))
            {
                throw new IOException($"File {e} does not exist.");
            }
            if (!File.Exists(p))
            {
                throw new IOException($"File {p} does not exist.");
            }
            if (!File.Exists(d))
            {
                throw new IOException($"File {d} does not exist.");
            }
            enableFile    = new UnixFile(e, "w");
            periodFile    = new UnixFile(p, "w");
            dutyCycleFile = new UnixFile(d, "w");
            disposed      = false;
        }
Esempio n. 2
0
 static void Write(UnixFile file, string text)
 {
     file.Reset();
     file.Write(text);
 }
Esempio n. 3
0
 static void Write(string fileName, string text)
 {
     using (var file = new UnixFile(fileName))
         file.Write(text);
 }