public Task <byte[]> Transceive(uint address, byte[] dataToSend, int receiveLength)
{
Contract.Requires(dataToSend, "dataToSend").NotToBeNull();
Contract.Requires(receiveLength, "receiveLength").ToBeInRange(x => x > 0);
return(Task.Run(() =>
{
uint transferredSize;
// Send data
var status = NativeMethods_I2C.I2C_DeviceWrite(
this.ChannelHandle,
address,
(uint)dataToSend.Length,
dataToSend,
out transferredSize,
WriteOptions | NativeMethods_I2C.TransferOptions.I2C_TRANSFER_OPTIONS_START_BIT);
if (status != FTDI.FT_STATUS.FT_OK || transferredSize != dataToSend.Length)
{
throw new CommunicationException("Error while writing to the bus. (Status: " + status + ")");
}
// Receive data
var buffer = new byte[receiveLength];
status = NativeMethods_I2C.I2C_DeviceRead(
this.ChannelHandle,
address,
(uint)receiveLength,
buffer,
out transferredSize,
ReadOptions |
NativeMethods_I2C.TransferOptions.I2C_TRANSFER_OPTIONS_START_BIT |
NativeMethods_I2C.TransferOptions.I2C_TRANSFER_OPTIONS_STOP_BIT |
NativeMethods_I2C.TransferOptions.I2C_TRANSFER_OPTIONS_NACK_LAST_BYTE);
if (status != FTDI.FT_STATUS.FT_OK)
{
throw new CommunicationException("Error while reading from the bus. (Status: " + status + ")");
}
if (transferredSize < receiveLength)
{
// If less bytes receive as expected => Copy to smaller array
var tmpData = new byte[transferredSize];
Array.Copy(buffer, tmpData, transferredSize);
buffer = tmpData;
}
return buffer;
}));
}
public Task <byte[]> Receive(uint address, int dataLength)
{
Contract.Requires(dataLength, "dataLength")
.ToBeInRange(x => x > 0);
return(Task.Run(() =>
{
var buffer = new byte[dataLength];
uint transferredSize;
var status = NativeMethods_I2C.I2C_DeviceRead(
this.ChannelHandle,
address,
(uint)dataLength,
buffer,
out transferredSize,
ReadOptions |
NativeMethods_I2C.TransferOptions.I2C_TRANSFER_OPTIONS_START_BIT |
NativeMethods_I2C.TransferOptions.I2C_TRANSFER_OPTIONS_STOP_BIT);
if (status != FTDI.FT_STATUS.FT_OK)
{
throw new CommunicationException("Error while reading from the bus. (Status: " + status + ")");
}
if (transferredSize < dataLength)
{
// If less bytes receive as expected => Copy to smaller array
var tmpData = new byte[transferredSize];
Array.Copy(buffer, tmpData, transferredSize);
buffer = tmpData;
}
return buffer;
}));
}
