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求助C6657和PC通信问题

我用的是C6657_EMAC_Example这里例程,C6657和PC通过网线直接连接

问题一:我加了IP头,以太网帧协议字段也改成了0x0800(IP协议),没加FCS字段。用wireshark可以抓到数据包,但是自己写的IP包嗅探程序就抓不到...

问题二:PC端发的包,dsp收不到。我在PC端使用原始套接字发送的