/// <summary>
/// Sends and Receives data.
/// </summary>
/// <param name="address"></param>
/// <param name="dataToWrite"></param>
/// <param name="numBytesToRead"></param>
/// <returns>Nothing. When data is received, an event will be generated</returns>
public byte[] SendReceive(byte[] dataToWrite)
{
if (dataToWrite.Length > 255)
{
throw new Exception("Maximum packet length is 255 bytes");
}
byte[] returnedData = new byte[dataToWrite.Length];
byte[] dataToSend = new byte[2 + dataToWrite.Length];
dataToSend[0] = (byte)DeviceCommands.SPITransaction;
dataToSend[1] = (byte)dataToWrite.Length;
dataToWrite.CopyTo(dataToSend, 2);
if (ChipSelect != null)
{
if (ChipSelectPolarity == PinPolarity.ActiveLow)
{
ChipSelect.DigitalValue = false;
}
else
{
ChipSelect.DigitalValue = true;
}
}
device.sendCommsConfigPacket(dataToSend);
//Thread.Sleep(1);
byte[] receivedData = device.receiveCommsResponsePacket();
if (ChipSelect != null)
{
ChipSelect.ToggleOutput();
}
return(receivedData);
}
/// <summary>
/// Sends and Receives data. This is a blocking call that won't return until I2C communication is complete.
/// </summary>
/// <param name="address">The address of the device. This address should not include the read/write bit.</param>
/// <param name="dataToWrite">Array of one or more bytes to write to the device.</param>
/// <param name="numBytesToRead">Number of bytes to receive from the device.</param>
/// <returns>Data read from the device.</returns>
public byte[] SendReceive(byte address, byte[] dataToWrite, byte numBytesToRead)
{
byte[] returnedData = new byte[numBytesToRead];
byte[] dataToSend = new byte[4 + dataToWrite.Length];
dataToSend[0] = (byte)DeviceCommands.I2CTransaction;
dataToSend[1] = address;
dataToSend[2] = (byte)dataToWrite.Length;
dataToSend[3] = numBytesToRead;
dataToWrite.CopyTo(dataToSend, 4);
lock (lockObject)
{
device.sendCommsConfigPacket(dataToSend);
Thread.Sleep(1);
byte[] response = device.receiveCommsResponsePacket();
if (numBytesToRead > 0)
{
Array.Copy(response, 1, returnedData, 0, numBytesToRead);
}
}
return(returnedData);
}