WARP Project Forums - Wireless Open-Access Research Platform

void emacRx_handler() {
	unsigned short RxPktLength, RxPktEtherType;
	int skipDataCallback = 0;
	int mgmtFrame = 0;
	void* pktBufPtr;
	warpnetEthernetPktHeader* thePkt;

	pktBufPtr = (void *)warpphy_getBuffAddr(controlStruct.pktBuf_emacRx)+NUM_HEADER_BYTES;

	//Wait for the DMA to be idle
	warpmac_waitForDMA();

	//Set DMA to non-increment source, increment dest addresses
	XDmaCentral_SetControl(&DmaCentralInst, XDMC_DMACR_DEST_INCR_MASK);

	//Read the Rx packet length; the packet must be read from the FIFO immediately after this read
	RxPktLength = XIo_In32(EMAC_FIFO_BaseAddr+XLLF_RLF_OFFSET);

	//warpmac_setDebugGPIO(0x7);
	//Transfer the Ethernet frame from the FIFO to the PHY buffer
	XDmaCentral_Transfer(&DmaCentralInst,
						(u8 *)(EMAC_FIFO_BaseAddr+XLLF_RDFD_OFFSET),
						(u8 *)pktBufPtr,
						RxPktLength);

	//Extract the EtherType field to determine if this is a management packet
	thePkt = (warpnetEthernetPktHeader*)(pktBufPtr);
	RxPktEtherType = thePkt->ethType;
	
#ifdef WARPNET_ETHTYPE_SVR2NODE
	if (RxPktEtherType == WARPNET_ETHTYPE_SVR2NODE) {
		//The packet is a WARPnet packet
		mgmtFrame = 1;
		skipDataCallback = 1;
	}
#endif
#ifdef WARPNET_ETHTYPE_NODE2SVR
	if (RxPktEtherType == WARPNET_ETHTYPE_NODE2SVR) {
		//The packet is a WARPnet packet from another node destined to the server; ignore it
		mgmtFrame = 0;
		skipDataCallback = 1;
	}
#endif
	
	if(mgmtFrame)
	{
		//Wait until the DMA transfer is done by checking the Status register
		warpmac_waitForDMA();
		
		usr_mgmtPkt(RxPktLength, pktBufPtr);
	}
	else if( (RxPktEtherType == 0x0806) && ( skipDataCallback == 0) && (controlStruct.dummyPacketMode == 0))
	{
		usr_dataFromNetworkLayer(RxPktLength, pktBufPtr);
	}
        else if( (skipDataCallback == 0) && (controlStruct.dummyPacketMode == 0))
	{
		usr_dataFromNetworkLayer(RxPktLength-4, pktBufPtr);
	}

	return;
}