public TransferReply TransferAndRead(byte[] data, int timeoutMS)
{
// send the first command
// 0 to 60 inclusively is the maximum length of data (64bytes SPI data minus 4bytes header)
if (data == null || data.Length > 60)
{
throw new ArgumentException("Spi data transfer must be non-null and should not exceed 60 bytes size.");
}
// create the packet
byte[] packet = new byte[Constants.PacketsSize];
packet[0] = CommandCodes.TransferSpiData;
packet[1] = (byte)data.Length;
for (int i = 0; i < data.Length; i++)
{
packet[i + 4] = data[i];
}
// write on device and read the reply
byte[] reply = _hidHandler.WriteData(packet);
// check for errors
if (reply[0] != CommandCodes.TransferSpiData)
{
throw new PacketReplyFormatException();
}
// continuously read the SPI bus status and wait till the data is ready
DateTime timeout = DateTime.Now.AddMilliseconds(timeoutMS);
while (reply[3] != ReplyStatusCodes.SPITransferFinished)
{
// check for timeout
if (timeout <= DateTime.Now)
{
throw new TimeoutException("SPI device is not replying.");
}
reply = _hidHandler.WriteData(packet);
}
// create the reply data
TransferReply transfReply = new TransferReply();
switch (reply[3])
{
case ReplyStatusCodes.SPITransferStarted:
transfReply.TransferStatus = SpiTransferStatus.Started;
break;
case ReplyStatusCodes.SPITransferNotFinished:
transfReply.TransferStatus = SpiTransferStatus.Waiting;
break;
case ReplyStatusCodes.SPITransferFinished:
transfReply.TransferStatus = SpiTransferStatus.Ended;
break;
default:
throw new NotImplementedException();
}
// read the SPI return data
int dataLength = reply[2];
transfReply.Data = new byte[dataLength];
for (int i = 0; i < dataLength; i++)
{
transfReply.Data[i] = reply[i + 4];
}
return(transfReply);
}
public TransferReply Transfer(byte[] data)
{
// 0 to 60 inclusively is the maximum length of data (64bytes SPI data minus 4bytes header)
if (data == null || data.Length > 60)
{
throw new ArgumentException("Spi data transfer must be non-null and should not exceed 60 bytes size.");
}
// create the packet
byte[] packet = new byte[Constants.PacketsSize];
packet[0] = CommandCodes.TransferSpiData;
packet[1] = (byte)data.Length;
for (int i = 0; i < data.Length; i++)
{
packet[i + 4] = data[i];
}
// write on device and read the reply
byte[] reply = _hidHandler.WriteData(packet);
// check for errors
if (reply[0] != CommandCodes.TransferSpiData)
{
throw new PacketReplyFormatException();
}
switch (reply[1])
{
case ReplyStatusCodes.CompletedSuccessfully:
break;
case ReplyStatusCodes.SpiBusNotAvailable:
throw new SpiBusNotAvailableException();
case ReplyStatusCodes.SpiTransferInProgress:
throw new SpiTransferInProgressException();
default:
throw new NotImplementedException();
}
// create the reply data
TransferReply transfReply = new TransferReply();
switch (reply[3])
{
case ReplyStatusCodes.SPITransferStarted:
transfReply.TransferStatus = SpiTransferStatus.Started;
break;
case ReplyStatusCodes.SPITransferNotFinished:
transfReply.TransferStatus = SpiTransferStatus.Waiting;
break;
case ReplyStatusCodes.SPITransferFinished:
transfReply.TransferStatus = SpiTransferStatus.Ended;
break;
default:
throw new NotImplementedException();
}
// read the SPI return data
int dataLength = reply[2];
transfReply.Data = new byte[dataLength];
for (int i = 0; i < dataLength; i++)
{
transfReply.Data[i] = reply[i + 4];
}
return(transfReply);
}