Qualcomm CAMIF and OV sensor debugging summary[1]www.mbtrend.com www.mbtrend.com www.mbtrend.com www.mbtrend.com www.mbtrend.com www.mbtrend.com www.mbtrend.com www.mbtrend.com www.mbtrend.com www.mbtrend.com www.mbtrend.com Qualcomm CAMIF and OV sensor debugging summary Mobile Phone Business Unit CDMA 2 Department Shi Huiqin February 2008 [Abstract] To use the camera interface of a Qualcomm platform and combine it with the sensor of OV (OmniVision) to realize the photo and video recording functions of the mobile phone camera, it is necessary to deal with the coordination of the two chips, the display and the requirements. In this process, many problems were encountered and solved. 【Keywords】 Photo preview CAMIF 1. Problem statement I am a novice, seeing ov sensor for the first time, and knowing Qualcomm\'s CAMIF for the first time. I have no experience and encountered many difficulties during debugging, such as no preview of any pixels, wrong image color, invalid photo area, inappropriate dispsize setting, full screen preview problem, black and white mode upper layer cannot be set, preview and photo range are inconsistent, software rotates 90 degrees and flattens, etc. 2. Solution First make a basic theoretical reserve. VGA: 640x480; QVGA: 320x240; YUV format: 4:2:2 Exposure control/gamma gain/white balance are all adjustments for effects. For sensors with larger pixel counts, such as 1280x1024, due to the large amount of data, the preview resolution is usually 640x512 and the photo resolution is 1280x1024, and the PCLK during photo shooting is twice that of preview, so that the frame rate can be the same for VFE (video front end). The bit6 of register 0x15 of Ov7670 can switch the sensor output HREF or HSYNC. We use HREF. Camera_process_config...
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