C++ (Cpp) low_level_receive Examples

Example #1

File: ethernetif.cpp Project: 8bitgeek/caribou-rtos

/**
 * Process tx and rx packets at the low-level interrupt.
 *
 * Should be called from the Stellaris Ethernet Interrupt Handler.  This
 * function will read packets from the Stellaris Ethernet fifo and place them
 * into a pbuf queue.  If the transmitter is idle and there is at least one packet
 * on the transmit queue, it will place it in the transmit fifo and start the
 * transmitter.
 *
 */
void
stellarisif_interrupt(struct netif *netif)
{
  struct ethernetif *ethernetif;
  struct pbuf *p;

  /* setup pointer to the if state data */
  ethernetif = netif->state;

  /**
   * Process the transmit and receive queues as long as there is receive
   * data available
   *
   */
  p = low_level_receive(netif);
  while(p != NULL) {
    /* Add the rx packet to the rx queue */
    if(!enqueue_packet(p, &ethernetif->rxq)) {
      /* Could not place the packet on the queue, bail out. */
      pbuf_free(p);
      break;
    }

    /* Check if TX fifo is empty and packet available */
    if((HWREG(ETH_BASE + MAC_O_TR) & MAC_TR_NEWTX) == 0) {
      p = dequeue_packet(&ethernetif->txq);
      if(p != NULL) {
        low_level_transmit(netif, p);
      }
    }

    /* Read another packet from the RX fifo */
    p = low_level_receive(netif);
  }

  /* One more check of the transmit queue/fifo */
  if((HWREG(ETH_BASE + MAC_O_TR) & MAC_TR_NEWTX) == 0) {
    p = dequeue_packet(&ethernetif->txq);
    if(p != NULL) {
      low_level_transmit(netif, p);
    }
  }
}

Example #2

/*..........................................................................*/
void eth_driver_read(void) {
    struct pbuf *p = low_level_receive();
    if (p != NULL) {                  /* new packet received into the pbuf? */
        if (ethernet_input(p, &l_netif) != ERR_OK) {   /* pbuf not handled? */
            LWIP_DEBUGF(NETIF_DEBUG, ("eth_driver_input: input error\n"));
            pbuf_free(p);                                  /* free the pbuf */
        }

        /* try to output a packet if TX fifo is empty and pbuf is available */
        if ((ETH->TR & MAC_TR_NEWTX) == 0) {
            p = l_txq.get();
            if (p != NULL) {
                low_level_transmit(p);
                pbuf_free(p);    /* free the pbuf, lwIP knows nothing of it */
            }
        }
    }

    ETH->IM |= ETH_INT_RX;                    /* re-enable the RX interrupt */
}