電腦能根據ip獲得mac地址

但暫時不能ping通，可能是ICMP還存在問題。

所用的單片機是atmega16單片機，網卡為enc28j60

終於ping通了！
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\Octopus>ping 192.168.1.50
Pinging 192.168.1.50 with 32 bytes of data:
Reply from 192.168.1.50: bytes=32 time=6ms TTL=128
Reply from 192.168.1.50: bytes=32 time=549ms TTL=128
Reply from 192.168.1.50: bytes=32 time=7ms TTL=128
Reply from 192.168.1.50: bytes=32 time=31ms TTL=128
Ping statistics for 192.168.1.50:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 6ms, Maximum = 549ms, Average = 148ms
C:\Users\Octopus>

昨晚上出錯的原因是接收指針ERDPT沒有初始化，並且發送數據的時候寫指針EWRPT也沒有清零。

TCP連接也能響應了！