public DfuStatus GetStatus()
{
byte[] status = DfuIn(DfuRequest.GetStatus, 0, 6);
DfuStatus ds = new DfuStatus(status);
// Todo: return custom string if status ErrVendor.
return(ds);
}
public void ProgramFirmware(byte[] FirmwareData)
{
if ((Attributes & DfuAttributes.CanDnload) == 0)
{
// Device is unable to download firmware.
throw new Exception("DFU Device is not capable of downloading firmware.");
}
DfuStatus status = GetStatus();
if (status.State != DfuState.AppIdle && status.State != DfuState.DfuIdle)
{
// Currently don't have any logic to apply corrective actions to this state.
throw new Exception("Expect DFU to be in idle state before programming. Status: " + status.ToString());
}
int blockSize = 4096;
if (blockSize > MaxTransferSize)
{
blockSize = MaxTransferSize;
}
byte[] block = new byte[blockSize];
// Send the firmware to the device in blocks.
int cursor = 0;
int blockIndex = 0;
while (cursor < FirmwareData.Length)
{
int copyLength = FirmwareData.Length - cursor;
if (copyLength > blockSize)
{
copyLength = blockSize;
}
Array.Copy(FirmwareData, cursor, block, 0, copyLength);
if (copyLength < blockSize)
{
Array.Clear(block, copyLength, blockSize - copyLength);
}
DfuDnload(blockIndex, block);
int timeout = 30000;
while (true)
{
status = GetStatus();
if (status.Status != DfuStatusValue.Ok)
{
throw new Exception("DFU Error status while downloading firmware: " + status.ToString());
}
if (status.State == DfuState.DfuDownloadIdle)
{
// Continue sending data
break;
}
timeout -= status.Polltimeout + 15;
if (timeout < 0)
{
throw new Exception("Timeout while waiting for DFU status. Current: " + status.ToString());
}
System.Threading.Thread.Sleep(status.Polltimeout);
}
cursor += copyLength;
}
// Transfer is completed, now send a zero-length DFU Dnload request followed by getting status to complete the transfer.
DfuDnload(0, new byte[0] {
});
status = GetStatus();
if (status.Status != DfuStatusValue.Ok)
{
throw new Exception("DFU Error status while manifesting firmware: " + status.ToString());
}
if (status.State != DfuState.DfuManifest)
{
throw new Exception("DFU unexpected state while manifesting firmware: " + status.ToString());
}
}
