minix/lib/liblwip/dist/doc/NO_SYS_SampleCode.c

   1 void eth_mac_irq()
   2 {
   3   /* Service MAC IRQ here */
   4
   5   /* Allocate pbuf from pool (avoid using heap in interrupts) */
   6   struct pbuf* p = pbuf_alloc(PBUF_RAW, eth_data_count, PBUF_POOL);
   7
   8   if(p != NULL) {
   9     /* Copy ethernet frame into pbuf */
  10     pbuf_take(p, eth_data, eth_data_count);
  11
  12     /* Put in a queue which is processed in main loop */
  13     if(!queue_try_put(&queue, p)) {
  14       /* queue is full -> packet loss */
  15       pbuf_free(p);
  16     }
  17   }
  18 }
  19
  20 static err_t netif_output(struct netif *netif, struct pbuf *p)
  21 {
  22   LINK_STATS_INC(link.xmit);
  23
  24   /* Update SNMP stats (only if you use SNMP) */
  25   MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p->tot_len);
  26   int unicast = ((p->payload[0] & 0x01) == 0);
  27   if (unicast) {
  28     MIB2_STATS_NETIF_INC(netif, ifoutucastpkts);
  29   } else {
  30     MIB2_STATS_NETIF_INC(netif, ifoutnucastpkts);
  31   }
  32
  33   lock_interrupts();
  34   pbuf_copy_partial(p, mac_send_buffer, p->tot_len, 0);
  35   /* Start MAC transmit here */
  36   unlock_interrupts();
  37
  38   return ERR_OK;
  39 }
  40
  41 static void netif_status_callback(struct netif *netif)
  42 {
  43   printf("netif status changed %s\n", ip4addr_ntoa(netif_ip4_addr(netif)));
  44 }
  45
  46 static err_t netif_init(struct netif *netif)
  47 {
  48   netif->linkoutput = netif_output;
  49   netif->output     = etharp_output;
  50   netif->output_ip6 = ethip6_output;
  51   netif->mtu        = ETHERNET_MTU;
  52   netif->flags      = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP | NETIF_FLAG_MLD6;
  53   MIB2_INIT_NETIF(netif, snmp_ifType_ethernet_csmacd, 100000000);
  54
  55   SMEMCPY(netif->hwaddr, your_mac_address_goes_here, sizeof(netif->hwaddr));
  56   netif->hwaddr_len = sizeof(netif->hwaddr);
  57
  58   return ERR_OK;
  59 }
  60
  61 void main(void)
  62 {
  63   struct netif netif;
  64
  65   lwip_init();
  66
  67   netif_add(&netif, IP4_ADDR_ANY, IP4_ADDR_ANY, IP4_ADDR_ANY, NULL, netif_init, netif_input);
  68   netif.name[0] = 'e';
  69   netif.name[1] = '0';
  70   netif_create_ip6_linklocal_address(&netif, 1);
  71   netif.ip6_autoconfig_enabled = 1;
  72   netif_set_status_callback(&netif, netif_status_callback);
  73   netif_set_default(&netif);
  74   netif_set_up(&netif);
  75
  76   /* Start DHCP and HTTPD */
  77   dhcp_init();
  78   httpd_init();
  79
  80   while(1) {
  81     /* Check link state, e.g. via MDIO communication with PHY */
  82     if(link_state_changed()) {
  83       if(link_is_up()) {
  84         netif_set_link_up(&netif);
  85       } else {
  86         netif_set_link_down(&netif);
  87       }
  88     }
  89
  90     /* Check for received frames, feed them to lwIP */
  91     lock_interrupts();
  92     struct pbuf* p = queue_try_get(&queue);
  93     unlock_interrupts();
  94
  95     if(p != NULL) {
  96       LINK_STATS_INC(link.recv);
  97
  98       /* Update SNMP stats (only if you use SNMP) */
  99       MIB2_STATS_NETIF_ADD(netif, ifinoctets, p->tot_len);
 100       int unicast = ((p->payload[0] & 0x01) == 0);
 101       if (unicast) {
 102         MIB2_STATS_NETIF_INC(netif, ifinucastpkts);
 103       } else {
 104         MIB2_STATS_NETIF_INC(netif, ifinnucastpkts);
 105       }
 106
 107       if(netif.input(p, &netif) != ERR_OK) {
 108         pbuf_free(p);
 109       }
 110     }
 111
 112     /* Cyclic lwIP timers check */
 113     sys_check_timeouts();
 114
 115     /* your application goes here */
 116   }
 117 }