The Internet Power Line Adapter - University of Queensland

Home Automation, Power Lines and the Internet Quenten Alick
/*
* continually update logical link background process
*/
UpdateLL();
/*
* REMOTE DEVICE:
*
* after the "get count" packet has been received, and
when the transmit
* buffer becomes available, load the "received valid
counter" value
* and transmit to the transmitter device
*/
if(GetCountRecd && TxBfrAvailable) {
GetCountRecd = FALSE;
txLPDU.LPDUheader = rxLPDU.LPDUheader;
txLPDU.DA.LSB = 0x01;
txLPDU.DA.MSB = 0x00;
txLPDU.DHC.LSB = config.systemAddr.LSB;
txLPDU.DHC.MSB = config.systemAddr.MSB;
txLPDU.SA.LSB = config.unitAddr.LSB;
txLPDU.SA.MSB = config.unitAddr.MSB;
txLPDU.SHC.LSB = config.systemAddr.LSB;
txLPDU.SHC.MSB = config.systemAddr.MSB;
txLPDU.LSDU[0] = COUNT_RESP_PKT;
txLPDU.LSDU[1] = HIGH_BYTE_OF(rxValidCount);
txLPDU.LSDU[2] = LOW_BYTE_OF(rxValidCount);
txLPDU.LPDUlength = CEBUS_HEADER_LEN + 3;
transmitCompleted = FALSE;
TransmitPacket(USE_WTI | USE_DELAY); /* use
WTI w/ delay */
/*
* background processing is complete--free
receive packet buffer resource
*/
RxBfrAvailable = TRUE;
}
/*
* REMOTE DEVICE:
*
* after the "transmit" packet has been received, and
when the transmit buffer becomes available, validate the
received "transmit" packet and, if valid, create the "loop
back" packet and queue the transmission via
LoopbackPktReady (see ProcessValidPacket())
*
* toggle progress LED after every 10 packets with valid
counts
* NOTE: A "valid" packet contains valid count AND
valid info in rest
* of body (see ProcessValidPacket())
*/
if (TransPktRecd && TxBfrAvailable) {
TransPktRecd = FALSE;
/*
* get received packet's count
*/
tempCtr = (((unsigned short int)rxLPDU.LSDU[1]) rxCount) {
rxCount = tempCtr + 1;
ProcessValidPacket();
}
if ((rxCount % 10) == 0)
LED_1 = !LED_1;
/*
* background processing is complete--free
receive packet buffer resource
*/
RxBfrAvailable = TRUE;
}
/*
* TRANSMITTER & REMOTE DEVICES:
* get current transmit status and process
*/
status = ConfirmTransmitPacket();
if (status==SUCCESS || status==FAILURE)
if(transmitting && (status==SUCCESS) )
txSuccess++;
transmitCompleted = TRUE;
}
/*
* TRANSMITTER DEVICE:
* when currently transmitting and after completing a
transmit and when
* no longer waiting for the remote device to loop back
the packet,
* process the next transmit packet unless the transmit
test is ended
*/
if (transmitting && !waitingForLoopback &&
transmitCompleted)
if(!ProcessTransmitEnd(FALSE)) /* if not end,
transmit next packet */
XmitOriginal();
/*
* REMOTE DEVICE:
* when loopback packet is loaded and transmit
completed, send loopback
* packet to transmitter device
*/
if(LoopbackPktReady && transmitCompleted) {
LoopbackPktReady = FALSE;
transmitCompleted = FALSE;
TransmitPacket(USE_WTI | USE_DELAY);
}
/*
* TRANSMITTER DEVICE:
* if "loopback" or response packet has not been
received from remote device
* in two seconds, continue with next transmit or send
transmitter device ONLY
* statistics to host
*/
if(responseTimerRunning) {
if(response_timer == GetVeryLowResTimeByte()
) else {
responseTimerRunning = FALSE;
if(waitingForLoopback) {
if(!ProcessTransmitEnd(FALSE)) /* if not end, transmit
next packet */
XmitOriginal();
} else {