Pehr Hovey / Mbed 2 deprecated UDPtest

Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed

Dependencies:   mbed

Core/device.cpp@0:a548a085de55, 2010-03-14 (annotated)

Committer:
pehrhovey
Date:
Sun Mar 14 00:54:12 2010 +0000
Revision:
0:a548a085de55

        

        
Who changed what in which revision?

        

            
                
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#include "mbed.h"





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using namespace mbed;





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Ethernet *eth;





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#ifdef __cplusplus





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extern "C" {





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#endif





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#include "lwip/opt.h"





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#include "lwip/def.h"





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#include "lwip/pbuf.h"





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#include "lwip/sys.h"





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#include "lwip/stats.h"





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#include "netif/etharp.h"





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#include "string.h"





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#define IFNAME0 'E'





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#define IFNAME1 'X'





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#define min(x,y) (((x)<(y))?(x):(y))





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struct netif *gnetif;





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static err_t device_output(struct netif *netif, struct pbuf *p) {





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  #if ETH_PAD_SIZE





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    pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */





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  #endif





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  do {





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    eth->write((const char *)p->payload, p->len);





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  } while((p = p->next)!=NULL);





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  eth->send();





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  #if ETH_PAD_SIZE





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    pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */





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  #endif





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  LINK_STATS_INC(link.xmit);





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  return ERR_OK;





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}





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void device_poll() {





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  struct eth_hdr *ethhdr;





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  struct pbuf *frame, *p;





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  int len, read;





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  while((len = eth->receive()) != 0) {





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      frame = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);





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      if(frame == NULL) {





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          return;





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      }





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      p = frame;





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      do {





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         read = eth->read((char *)p->payload, p->len);





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         p = p->next;





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      } while(p != NULL && read != 0);





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      #if ETH_PAD_SIZE





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          pbuf_header(p, ETH_PAD_SIZE);





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      #endif





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      ethhdr = (struct eth_hdr *)(frame->payload);





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      switch(htons(ethhdr->type)) {





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          case ETHTYPE_IP:





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              etharp_ip_input(gnetif, frame);





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              pbuf_header(frame, -((s16_t) sizeof(struct eth_hdr)));





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              gnetif->input(frame, gnetif);





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              break;





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          case ETHTYPE_ARP:





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              etharp_arp_input(gnetif, (struct eth_addr *)(gnetif->hwaddr), frame);





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              break;





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          default:





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              break;





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      }





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      pbuf_free(frame);





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  }





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}





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err_t device_init(struct netif *netif) {





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printf("device_init\r\n");





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  LWIP_ASSERT("netif != NULL", (netif != NULL));





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  NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, 0x2EA);





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  /* maximum transfer unit */





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  netif->mtu = 0x2EA;





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  /* device capabilities */





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  /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */





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  netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;





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  netif->state = NULL;





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  gnetif = netif;





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  netif->name[0] = IFNAME0;





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  netif->name[1] = IFNAME1;





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  /* We directly use etharp_output() here to save a function call.





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   * You can instead declare your own function an call etharp_output()





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   * from it if you have to do some checks before sending (e.g. if link





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   * is available...) */





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  netif->output          = etharp_output;





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  netif->linkoutput      = device_output;





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  eth = new Ethernet();





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  return ERR_OK;





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}





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void device_address(char *mac) {





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    eth->address(mac);





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}





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#ifdef __cplusplus





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};





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#endif