private AisStatus LOCAL_bufWrite(Byte[] buffer, Int32 index, Int32 Bytes, Int32 timeout)
{
Int32 xmtSize = ioBits / 8;
AisStatus status = AisStatus.IN_PROGRESS;
// check that we can write specified Byte count cleanly
if (Bytes % xmtSize != 0)
{
logFxn(String.Format("(AIS Parse): Cannot write {0} Bytes in chunks of {1}!", Bytes, xmtSize));
return(AisStatus.ERROR);
}
// perform IO transaction in N-bit "bites"
for (Int32 i = 0; i < Bytes / xmtSize; i++)
{
status |= writeFxn(buffer, index + i * xmtSize, xmtSize, timeout);
LOCAL_delay(ioDelay);
if (status < 0)
{
logFxn("(AIS Parse): I/O Error in write!");
break;
}
}
return(status);
}
private AisStatus AIS_OS(UInt32 command)
{
UInt32 xmtWord = command;
UInt32 rcvWord = 0;
Byte[] rcvWordB = new Byte[4];
AisStatus status = AisStatus.IN_PROGRESS;
Int32 retryCnt = 0;
Int32 retryCntMax = 10;
while (true)
{
// send ping
status |= LOCAL_bufWrite(LOCAL_UInt322b(xmtWord), 0, 4, ioTimeout);
// receive pong
if (status >= 0)
{
status |= LOCAL_bufRead(rcvWordB, 0, 4, ioTimeout);
rcvWord = LOCAL_b2UInt32(rcvWordB);
}
// fail on IO error
if (status < 0)
{
LOCAL_delay(opcodeDelay);
if (retryCnt++ >= retryCntMax)
{
logFxn(String.Format("(AIS Parse): Opcode Sync failed after {0} consecutive I/O failures.", retryCnt));
return(AisStatus.ERROR);
}
// send zero word (32 bits) to clear potentially corrupted state on target
status |= LOCAL_bufWrite(LOCAL_UInt322b(0), 0, 4, ioTimeout);
status = 0;
continue;
}
// pass on proper response
if (rcvWord == AIS_opcode2ack(xmtWord))
{
if (retryCnt > 0)
{
logFxn(String.Format("(AIS Parse): Opcode Sync passed after {0} consecutive I/O failures.", retryCnt));
}
return(AisStatus.IN_PROGRESS);
}
}
}
// Start Word Sync Function
private AisStatus AIS_SWS()
{
UInt32 rcvWord = 0;
Byte[] rcvWordB = new Byte[4];
UInt32 xmtWord = AIS_XMT_START(ioBits);
AisStatus status = AisStatus.IN_PROGRESS;
while (true)
{
// send xmt start
status |= LOCAL_bufWrite(LOCAL_UInt322b(xmtWord), 0, ioBits / 8, ioTimeout);
if (status < 0)
{
status = 0;
LOCAL_delay(opcodeDelay);
continue;
}
// receive word
status |= LOCAL_bufRead(rcvWordB, 0, ioBits / 8, ioTimeout);
rcvWord = LOCAL_b2UInt32(rcvWordB);
// fail on IO error
if (status < 0)
{
return(AisStatus.ERROR);
}
// break if word is rcv start
if (rcvWord == AIS_RCV_START(ioBits))
{
break;
}
}
return(AisStatus.IN_PROGRESS);
}
