flaneth

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/* flaneth - flash and ethernet version 0.2 date 2008-11-08 Copyright (C)
   2007-2008 Stefan Schuermans <stefan@schuermans.info> Copyleft: GNU public
   license V2 - http://www.gnu.org/copyleft/gpl.html a BlinkenArea project -
   http://www.blinkenarea.org/ */
#include "arp.h"
#include "config.h"
#include "debug.h"
#include "ethernet.h"
#include "ip.h"
#include "macros.h"
#include "nethelp.h"
// timing parameters
#define ArpTicksMax 150 // maximum age of ARP table entries (in 200ms steps)
#define ArpNoMacTicksMax 50     // maximum age of ARP table entries without
                                // MAC (in 200ms steps)
#define ArpRetryTicks 8 // time after which to retry ARP query (must be power 
                        // of 2, in 200ms steps)
// ARP table
#define ArpTabFlagInUse 0x01
#define ArpTabFlagMacOk 0x02
struct ArpTable {
  unsigned char Flags;  // flags - see constants
  unsigned char Ticks;  // age of entry in 200ms steps
  unsigned char Mac[6];
  unsigned char Ip[4];
} ArpTab[12];
// initialize
void ArpInit(void)      // (extern)
{
  unsigned char i;
  // empty ARP tabale
  for (i = 0; i < count(ArpTab); i++)
    ArpTab[i].Flags = 0;
}
// send an ARP request
static void ArpSendRequest(unsigned char *pIp)
{
  struct ArpPacket ArpRequest;
  debug_arp_printf("send req ip=%u.%u.%u.%u", pIp[0], pIp[1], pIp[2], pIp[3]);
  // build ARP request
  ArpRequest.ArpHdr.HwType = htons(0x0001);     // ethernet
  ArpRequest.ArpHdr.ProtoType = htons(0x0800);  // IP
  ArpRequest.ArpHdr.HwLen = 0x06;       // length of a MAC address
 
 
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