/**
* 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, ðernetif->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(ðernetif->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(ðernetif->txq);
if(p != NULL) {
low_level_transmit(netif, p);
}
}
}
/*..........................................................................*/
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 */
}