private static readonly object m_ThreadLock = new object(); // lock object to start/stop scanning thread
#endregion
/// <summary>
/// Create a new instance of Driver2x74HC595
/// </summary>
/// <param name="DsPin">Ds Pin Number</param>
/// <param name="STcpPin">STcp Pin Number</param>
/// <param name="SHcpPin">SHcp Pin Number</param>
public Driver2x74HC595(int DsPin, int STcpPin, int SHcpPin)
{
m_IsScanActive = false;
var gpio = GpioController.GetDefault();
// setup the pins
PinDS = gpio.OpenPin(DsPin);
PinDS.SetDriveMode(GpioPinDriveMode.Output);
PinSTCP = gpio.OpenPin(STcpPin);
PinSTCP.SetDriveMode(GpioPinDriveMode.Output);
PinSHCP = gpio.OpenPin(SHcpPin);
PinSHCP.SetDriveMode(GpioPinDriveMode.Output);
// initialize the pins to low
PinDS.Write(GpioPinValue.Low);
PinSTCP.Write(GpioPinValue.Low);
PinSHCP.Write(GpioPinValue.Low);
// create scan thread
m_WorkerThread = new BackgroundWorker {
WorkerSupportsCancellation = true
};
m_WorkerThread.DoWork += (sender, args) =>
{
while (!m_WorkerThread.CancellationPending)
{
PresentMatrix(); // scan matrix to LED
}
};
}
// Write one byte of data
private void WriteData(byte rowData8Bit)
{
for (int i = 8; i >= 1; i--)
{
PinDS.Write((rowData8Bit & 0x80) > 0 ? GpioPinValue.High : GpioPinValue.Low);
rowData8Bit <<= 1;
PulseSHCP();
}
}
