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Test pattern variance, issue #20 and documentation updates #22

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@krzychb krzychb commented Dec 31, 2016

  1. Test pattern variance to aid troubleshooting of issues with image retrieval
  2. Option to reverse 442ca8a to troubleshoot issue After fixing Issue #11, OV7725 is unable to operate @ 20MHz XCLK #20
  3. Alternate pin mappig to quickly switch from default pinout / demonstrate flexibility of pin selection
  4. Documentation updates
    • Alternate pin mapping
    • Description of s/w application components
    • Using test pattern variance
    • Updated output logs

1.  Implemented calculation of test pattern variance to aid
troubleshooting of issues with signal lines / image retrieval
2. Issue igrr#20 – Added option to reverse
igrr@442ca8a
to troubleshoot issue igrr#20
1. Alternate pin mapping
2. Description of s/w application components
3. Using test pattern variance
4. Updated output logs
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igrr commented Jun 7, 2017

Thank you @krzychb, I've cherry-picked "documentation update" and LICENSE commits into master. 20MHz mode is fixed for OV7725 now, so I didn't merge the troubleshooting changes.
Note that due to some changes to support JPEG mode the new diagram now doesn't exactly reflect the software structure... for example, the number of DMA buffers is calculated during initialization depending on resolution and other factors. But the diagram is still more helpful than no diagram.

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