need help for omap3 isp-camera interface

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Hi All,
 
   I'm working on video image capture(omap3 isp) interface(PSP 1.0.2), and have met many difficulties. At the camera side, the 8 bits BT656 signal are connected to cam_d[0-7], which looks OK. The cam_fld, cam_hs and cam_vs are also connected, At the omap3 side, I use saMmapLoopback.c, it runs, however, it receives only HS_VS_IRQ, but no any image data. I checked FLDSTAT(CCDC_SYN_MODE), it's never changed.
Right now, I don't know what to check, if you can give some suggestions, your help will be greatly appreciated. Thanks in advance.
 
Wending Weng
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