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After the configuration, The CMOS sensor starts to capture and output image data streams, the
CMOS sensor Capture block extracts the valid pix data streams based on the synchronous signals
from the CMOS sensor. The data streams are generated in Bayer Color Pattern format. So it’s then
converted to RGB data streams by the RAW2RGB block.
After that, the Multi-Port SDRAM Controller acquires and writes the RGB data streams to the
SDRAM which performs as a frame buffer. The Multi-Port SDRAM Controller has two write ports
and read ports also with 16-bit data width each. The writing clock is the same as CMOS sensor pix
clock, and the reading clock is provided by the LCD Controller, which is 33MHz.
Finally, the LCD controller fetches the RGB data from the buffer and displays it on the LCD panel
continuously. Because the resolution and timing of the LCD is compatible with WVGA@800*480,
the LCD controller generates the same timing and the frame rate can achieve about 25 fps.
For the objective of a better visual effect, the CMOS sensor is configured to enable the left right
mirror mode. User could disable this functionality by modifying the related register value being
written to CMOS controller chip.
Figure 4-6 Block diagram of the digital camera design
Demonstration Source Code
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Project directory: Camera
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Bit stream used: Camera.sof
