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beaglebone ethernet problem

Hello,

I'm using Starterware 2.00.00.06 on beaglebone Rev A3. I have this simple test program to keep sending out UDP packets.  After sending about 142 packets, it stops getting interrupts to run CPSWCore0TxIsr(). Since the packets accumulate on the tx queue, eventually the pbuf_alloc( ) fails.

The 3 source files are attached. Any help would be greatly appreciated.

Yanli

6254.main.c6648.lwiplib.c4670.lwipopts.h