static void txudp(Byte[] txdata, Byte txtype, Byte filestat)
{
// add the txtype and filestatus at the beginning
Byte[] darr = new byte[statics.PayloadLen + 2];
darr[0] = txtype;
darr[1] = filestat;
Array.Copy(txdata, 0, darr, 2, statics.PayloadLen);
Udp.UdpSendData(darr);
// Console.WriteLine("TX filestat: " + filestat+ " data:" + darr[2].ToString("X2") + " " + darr[3].ToString("X2"));
}
// runs every 10 ms
static void TimerTick(object stateInfo)
{
// check if we need to send something
if (getSending() == false)
{
return; // nothing to send
}
// check the TX buffer, do not feed more data into
// the buffer if it has already more than 10 entries
if (Udp.GetBufferCount() > 3)
{
return;
}
Byte[] txarr = new byte[statics.PayloadLen];
// check if txdata is smaller or equal one payload
if (filestat == statics.FirstFrame)
{
// send the first frame
if (txlen <= statics.PayloadLen)
{
// we just need to send one frame
txudp(txdata, txtype, statics.SingleFrame);
setSending(false); // transmission complete
}
else
{
// additional frame follow
// from txdata send one chunk of length statics.PayloadLen
// frame is repeated for preamble by hsmodem.cpp
Array.Copy(txdata, 0, txarr, 0, statics.PayloadLen);
txudp(txarr, txtype, statics.FirstFrame);
txpos = statics.PayloadLen;
filestat = statics.NextFrame;
}
return;
}
if (filestat == statics.NextFrame)
{
// check if this is the last frame
int restlen = txlen - txpos;
if (restlen <= statics.PayloadLen)
{
// send as the last frame
Array.Copy(txdata, txpos, txarr, 0, restlen); // unused byte will be 0
// send the last frame a couple of times
for (int i = 0; i < 10; i++)
{
txudp(txarr, txtype, statics.LastFrame);
}
setSending(false); // transmission complete
}
else
{
// additional frame follows
// from txdata send one chunk of length statics.PayloadLen
Array.Copy(txdata, txpos, txarr, 0, statics.PayloadLen);
txudp(txarr, txtype, statics.NextFrame);
txpos += statics.PayloadLen;
}
return;
}
}