/// <summary>
/// Reads in a specified number of bytes starting at the specified address
/// </summary>
/// <param name="address">Address to read from</param>
/// <param name="registersToRead">Number of registers to read</param>
/// <returns></returns>
private byte[] ReadRegister(byte address, int registersToRead = 1)
{
if (registersToRead < 1)
{
throw new Exception("At least one byte must be specified to read in");
}
var readBuffer = new byte[1 + registersToRead]; // registersToRead bytes for reading in, one byte of padding
var regAddressBuffer = new byte[1 + registersToRead]; // One byte for address, registersToRead bytes of padding
regAddressBuffer[0] = address; // Set the address to the first byte
CHIP_SELECT.Write(GpioPinValue.Low);
spiDisplay.TransferFullDuplex(regAddressBuffer, readBuffer);
CHIP_SELECT.Write(GpioPinValue.High);
return(readBuffer.Skip(1).ToArray()); // The first has a dead bit that was transferred while reading in the address to read from, so chop that off
}
/// <summary>
/// Writes one byte to the specified register's address
/// </summary>
/// <param name="address">Address to write to</param>
/// <param name="value">Value to write to the register</param>
private void WriteRegister(byte address, byte value)
{
CHIP_SELECT.Write(GpioPinValue.Low);
spiDisplay.Write(new byte[] { address, value });
CHIP_SELECT.Write(GpioPinValue.High);
}