private void InitPanel(byte[] control)
{
for (int p = 0; p < PanelsPerFrame * 2; p = p + 2)
{
SendDataBytes[p] = control[0];
SendDataBytes[p + 1] = control[1];;
}
SpiDisplay.Write(SendDataBytes);
}
static void Main(string[] args)
{
var pin = 17;
var lightTimeInMilliseconds = 500;
var dimTimeInMilliseconds = 500;
byte[] buffer = new byte[2];
UInt16 data = 0, config, sendValue;
System.IO.Ports.SerialPort port = new SerialPort();
// SPI
// DAC on GertBoard on CS1
// using '/dev/spidev0.1' (use chipSelect = 0 for spidev0.0)
var busId = 0;
var chipSelect = 1;
var settings = new SpiConnectionSettings(busId, chipSelect);
// create device to talk to DtoA (MCP4802)
SpiDevice spi = new UnixSpiDevice(settings);
using (GpioController controller = new GpioController())
{
controller.OpenPin(pin, PinMode.Output);
Console.WriteLine($"GPIO pin enabled for use: {pin}");
Console.CancelKeyPress += (object sender, ConsoleCancelEventArgs eventArgs) =>
{
controller.Dispose();
};
while (true)
{
Console.WriteLine($"Light for {lightTimeInMilliseconds}ms");
controller.Write(pin, PinValue.High);
Thread.Sleep(lightTimeInMilliseconds);
Console.WriteLine($"Dim for {dimTimeInMilliseconds}ms");
controller.Write(pin, PinValue.Low);
Thread.Sleep(dimTimeInMilliseconds);
// data has to be sent as 16 bit value with CS low for both bytes
//
config = 0x3000; // Channel A, Gain = 1 (0011)
// config = 0xB000; // Channel B, Gain = 1 (1011)
// config = 0x1000; // Channel A, Gain = 2 (0001)
// config = 0x9000; // Channel B, Gain = 2 (1001)
// data left shifted by 4 bits
sendValue = (ushort)(data << 4);
sendValue |= config;
buffer[0] = (byte)((sendValue & 0xFF00) >> 8);
buffer[1] = (byte)(sendValue & 0x00FF);
// send using Write(ReadOnlySpan) as WriteByte will raise CS between bytes
ReadOnlySpan <byte> span = buffer;
// write 16 bit value to DAC
spi.Write(span);
// increment data value
data += 10;
// reset data value
if (data >= 256)
{
data = 0;
}
}
}
}