基于ARM LPC2200，周立功easyarm 2200实验板，采用ucos2.76,移植了lwip，但是缺少emac驱动共四个底层函数，EMACSendPacket,EMACInit,GetInputPacketLen,EMACReadPacket.-Based on the ARM LPC2200, Zhou Ligong easyarm 2200 experimental plates, the use of ucos2.76, transplant lwip, but the lack