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The demo hanged up when running the facedetect_example.

 I am testing the facedetect module, and want to enable it. But when I run it it always hand up after send EXEC command to it. It's stop at facedetect_int_wait(1) that interrupt will be generate when the facedectect was done. But the interrupt was not occur.

Had anybody test this program and encounter this problem? And how to resoleve it?