/**
* Should allocate a pbuf and transfer the bytes of the incoming
* packet from the interface into the pbuf.
*
* @param netif the lwip network interface structure for this ethernetif
* @return a pbuf filled with the received packet (including MAC header)
* NULL on memory error
*/
static struct pbuf * low_level_input(struct netif *netif)
{
struct pbuf *p, *q;
u16_t len;
//uint32_t l=0,i =0;
//FrameTypeDef frame;
//u8_t *buffer;
p = NULL;
/* Obtain the size of the packet and put it into the "len"
variable. */
len = enc28j60BeginPacketReceive();
if(!len) {
#ifdef DEBUG
debug_printf("ETH DEBUG: low_level_input %d\n\r", len);
#endif
return NULL;
}
#if ETH_PAD_SIZE
len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
#endif
/* We allocate a pbuf chain of pbufs from the pool. */
p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
if (p != NULL) {
#if ETH_PAD_SIZE
pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
#endif
/* We iterate over the pbuf chain until we have read the entire
* packet into the pbuf. */
for(q = p; q != NULL; q = q->next) {
/* Read enough bytes to fill this pbuf in the chain. The
* available data in the pbuf is given by the q->len
* variable. */
//read data into(q->payload, q->len);
enc28j60PacketReceive(q->payload, q->len);
}
//acknowledge that packet has been read();
enc28j60EndPacketReceive();
#if ETH_PAD_SIZE
pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
#endif
// LINK_STATS_INC(link.recv);
} else {
//drop packet();
enc28j60EndPacketReceive();
//LINK_STATS_INC(link.memerr);
//LINK_STATS_INC(link.drop);
}
return p;
}
uint16_t nic_poll(void)
{
uint16_t packetLength;
packetLength = enc28j60BeginPacketReceive();
// if there's no packet or an error - exit without ending the operation
if( !packetLength )
return 0;
// drop anything too big for the buffer
if( packetLength > UIP_BUFSIZE )
{
#ifdef DEBUG_SERIAL
printf("Recieved big packet %i bytes, dropping \r\n",(int)uip_len);
#endif
enc28j60EndPacketReceive();
return 0;
}
// copy the packet data into the uIP packet buffer
enc28j60PacketReceive( uip_buf, packetLength );
enc28j60EndPacketReceive();
#ifdef DEBUG_SERIAL
printf("Recieved & transferred to uip, packet %i bytes\r\n",(int)uip_len);
#endif
return packetLength;
}