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echod.c中的echo_send_data是如何和sitaraif_tx_inthandler连接在一起？使得程序中断的时候能够传送数据？
这个要看一下LWIP 协议栈，请看下面的pbuf数据发送流程。
http://processors.wiki.ti.com/index.php/StarterWare_Ethernet_Design#StarterWare_Network_Interface_Layer
