protected void Write(IFTDI device, byte[] data)
{
ValidateDeviceParameter(device);
var status = device.Write(data, data.Length, out var writtenBytes);
if (status != FT_STATUS.FT_OK)
{
throw new FTDIWriteException();
}
}
private void DoFirmwareUpdate()
{
bool success = false;
try
{
const int chunkSize = 4 * 1024;
const int flashSectorSize = 64 * 1024;
int origSize = _firmwareData.Length;
int extraSize = flashSectorSize - _firmwareData.Length % flashSectorSize;
int paddedSize = origSize + extraSize;
Array.Resize(ref _firmwareData, paddedSize);
int dataIndex = 0;
bool haveFailure = false;
while (dataIndex < _firmwareData.Length)
{
int numBytesInChunk = 0;
UInt32 chunkChecksum = 0;
while (((dataIndex + numBytesInChunk) < _firmwareData.Length) && (numBytesInChunk < chunkSize))
{
chunkChecksum += _firmwareData[dataIndex + numBytesInChunk];
numBytesInChunk++;
}
// Request to send the chunk
String cmd = String.Format("F {0:x} {1:x} {2:x}", dataIndex, numBytesInChunk, chunkChecksum);
String answer;
int numRetries = 3;
while (numRetries > 0)
{
WriteLine(cmd);
answer = SendCmdGetResponse(cmd);
if (!answer.StartsWith("Y"))
{
numRetries--;
WriteLine("Retrying");
Thread.Sleep(500);
}
else
{
break;
}
}
if (0 == numRetries)
{
haveFailure = true;
break;
}
// We can now send the chunk
_uart.DiscardInBuffer();
_uart.DiscardOutBuffer();
byte[] chunk = new byte[chunkSize];
Buffer.BlockCopy(_firmwareData, dataIndex, chunk, 0, numBytesInChunk);
_uart.Write(chunk);
dataIndex += numBytesInChunk;
// Verify the response
answer = _uart.ReadLineTimeout(30000);
if (!answer.StartsWith("Y"))
{
haveFailure = true;
break;
}
Thread.Sleep(500);
}
if (false == haveFailure)
{
success = true;
}
}
catch
{
success = false;
}
WriteLine(success ? "Firmware update complete. Restart device!" : "Firmware update failed!");
}