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    <p>I think the details are pretty clear in page 10 inside this document:</p> <p><a href="http://www.4dsystems.com.au/downloads/micro-CAM/Docs/uCAM-DS-rev4.pdf" rel="nofollow">http://www.4dsystems.com.au/downloads/micro-CAM/Docs/uCAM-DS-rev4.pdf</a></p> <p>First, one package is between 64 to 512 bytes - flexibly defined by the programmer. Image size is the actual JPEG image itself....nothing more or less....just pure JPEG image. So the equation to calculate the number of package based on image_size / package_size is given in page 10. </p> <p>Next, is that (package_size - 6) is to be consistently used everywhere, because 6 bytes are used up for non-data purpose, so (package_size - 6) will be just the data - but u have to reassemble it yourself.</p> <p>To assemble the data from the package, u have to strip the 4 byte header + 2 byte trailer and concatenate all these from all the package sequentially one after another.</p> <p>Other facts:</p> <p>a. "Set Package Size" command must be sent from host to CAM - before "SNAPSHOT" command, which capture the image from the camera into the CAM memory buffer. </p> <p>b. Next is to send "SNAPSHOT" command to capture the image into memory buffer.</p> <p>c. Last is to send "GET PICTURE" command (only one time, but data will come back multiple times - see diagram in page 15) to extract out all the images....and it will come back in the form of "package" as we have defined the size earlier in "set package size". Since u have calculate the formula u will know when to stop asking for the next package. And there is a verification byte - u have to used that to make sure data is correct.</p>
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    1. USPeter Teoh
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    1. COThat about matches what I concluded by trying to translate the mis-statements in the data sheet back to their probable intent - but also be careful of that warning about needing to reset the thing after certain size packets. This is about as far as you can go without buying the device and trying it. At which point, if it's a non-hobby project, developer time contemplating it has already added up to more than the hardware cost.
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      1. USChris Stratton
    2. COThis probably doesn't need mentioning, but it's likely going to be a lot easier to do the initial testing using a PC rather than an embedded platform; a small amount of time invested in writing wrapper functions for the PC OS's serial interface and the embedded system's can make the functional logic essentially portable between the two.
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      1. USChris Stratton
    3. COThanks everyone. This is very much a hobby project, so it's just something I'm tinkering with. I just haven't been able to get off the ground with the right algorithm. This is a great place to start. Also, Chris: Great suggestion about using the PC for prototyping and initial testing.
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      1. USGlenn
 

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