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DSP and Matlab communication problem

Hi,

I'm using the serial port to exchange data between DSP and Matlab. First, DSP write data to Matlab and then Matlab write back. Now Matlab can successfully read the data sent from DSP. The problem is DSP cannot successfully read all the data writen back from Matlab. Does anybody ever have similar problem? I can paste my code here if needed. Thanks!

Regards,

Yang