memhandle
Enc28J60Network::receivePacket()
{
uint8_t rxstat;
uint16_t len;
// check if a packet has been received and buffered
//if( !(readReg(EIR) & EIR_PKTIF) ){
// The above does not work. See Rev. B4 Silicon Errata point 6.
if (readReg(EPKTCNT) != 0)
{
uint16_t readPtr = nextPacketPtr+6 > RXSTOP_INIT ? nextPacketPtr+6-RXSTOP_INIT+RXSTART_INIT : nextPacketPtr+6;
// Set the read pointer to the start of the received packet
writeRegPair(ERDPTL, nextPacketPtr);
// read the next packet pointer
nextPacketPtr = readOp(ENC28J60_READ_BUF_MEM, 0);
nextPacketPtr |= readOp(ENC28J60_READ_BUF_MEM, 0) << 8;
// read the packet length (see datasheet page 43)
len = readOp(ENC28J60_READ_BUF_MEM, 0);
len |= readOp(ENC28J60_READ_BUF_MEM, 0) << 8;
len -= 4; //remove the CRC count
// read the receive status (see datasheet page 43)
rxstat = readOp(ENC28J60_READ_BUF_MEM, 0);
//rxstat |= readOp(ENC28J60_READ_BUF_MEM, 0) << 8;
#ifdef ENC28J60DEBUG
Serial.print("receivePacket [");
Serial.print(readPtr,HEX);
Serial.print("-");
Serial.print((readPtr+len) % (RXSTOP_INIT+1),HEX);
Serial.print("], next: ");
Serial.print(nextPacketPtr,HEX);
Serial.print(", stat: ");
Serial.print(rxstat,HEX);
Serial.print(", count: ");
Serial.print(readReg(EPKTCNT));
Serial.print(" -> ");
Serial.println((rxstat & 0x80)!=0 ? "OK" : "failed");
#endif
// decrement the packet counter indicate we are done with this packet
writeOp(ENC28J60_BIT_FIELD_SET, ECON2, ECON2_PKTDEC);
// check CRC and symbol errors (see datasheet page 44, table 7-3):
// The ERXFCON.CRCEN is set by default. Normally we should not
// need to check this.
if ((rxstat & 0x80) != 0)
{
receivePkt.begin = readPtr;
receivePkt.size = len;
#ifdef ENC28J60DEBUG
Serial.print("receivePkt.size=");
Serial.println(len);
#endif
return UIP_RECEIVEBUFFERHANDLE;
}
// Move the RX read pointer to the start of the next received packet
// This frees the memory we just read out
setERXRDPT();
}
return (NOBLOCK);
}
void
Enc28J60Network::copyPacket(memhandle dest_pkt, memaddress dest_pos, memhandle src_pkt, memaddress src_pos, uint16_t len)
{
memblock *dest = &blocks[dest_pkt];
memblock *src = src_pkt == UIP_RECEIVEBUFFERHANDLE ? &receivePkt : &blocks[src_pkt];
memblock_mv_cb(dest->begin+dest_pos,src->begin+src_pos,len);
// Move the RX read pointer to the start of the next received packet
// This frees the memory we just read out
setERXRDPT();
}
void
Enc28J60Network::copyPacket(memhandle dest_pkt, memaddress dest_pos, memhandle src_pkt, memaddress src_pos, uint16_t len)
{
memblock *dest = &blocks[dest_pkt];
memblock *src = src_pkt == UIP_RECEIVEBUFFERHANDLE ? &receivePkt : &blocks[src_pkt];
memaddress start = src_pkt == UIP_RECEIVEBUFFERHANDLE && src->begin + src_pos > RXSTOP_INIT ? src->begin + src_pos-RXSTOP_INIT+RXSTART_INIT : src->begin + src_pos;
enc28J60_mempool_block_move_callback(dest->begin+dest_pos,start,len);
// Move the RX read pointer to the start of the next received packet
// This frees the memory we just read out
setERXRDPT();
}
void
Enc28J60Network::freePacket()
{
setERXRDPT();
}
