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Has anyone tried the STM32F4DIS-CAM?

Former Member

I've been working with the camera expansion board and have hit a few issues/have some questions.

 

Unfortunately I'm not setup to compile the provided example directly so I don't really have a baseline as to how the camera should perform... I've been using gcc on top of libopencm3 so had to create a bunch of stuff (there is currently no dcmi support in libopencm3 and the dma support is under development).

 

I do have the camera working, mostly. image

 

But, I'm only able to get monochrome images out of it... From the docs I thought the camera was the OV9655 which is color. Might the provided module actually be the OV9155 monochrome camera? Is there any way to tell from the register set? The only one I've seen is the product ID but that turns out to be a revision (the module I have is REV5). I don't see any markings on the module itself.

 

There is one bug in the supplied code: it puts the camera in RGB565 mode (presumably to match the DCMI 565 mode). Given that it's dma'ing the data straight to the LCD this looks rather interesting on an RGB555 display... Fortunately it seems that everything is happy if you put the camera in RGB555 mode as the word size is still 16 bits.

 

The image quality is quite poor at present as well. Either much tuning is needed in the camera configuration or this is all the result of me having something grossly wrong image

 

Thanks for any help!

 

Shannon

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  • 0

    I just checked out the specs again...

     

    It looks like the camera can handle 1280x1024, but the display only does 320x240 - And like you said, the sample has the camera stream the image data straight to the LCD. Then when a button is clicked the picture is saved from the LCD, not taken directly from the camera.

     

    So that picture in my blog post is kind of a poor representation of what the camera can do. I haven't had much time to look at this yet, but you'd think it should be possible to take a picture directly from the camera to get better quality.

     

    ps, sorry, I noticed your question was also about how to tell what kind of camera it is, and I have no clue! it just sorta worked out of the box with the given samples.

     

    Cheers,

    -Nico

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  • 0

    I just checked out the specs again...

     

    It looks like the camera can handle 1280x1024, but the display only does 320x240 - And like you said, the sample has the camera stream the image data straight to the LCD. Then when a button is clicked the picture is saved from the LCD, not taken directly from the camera.

     

    So that picture in my blog post is kind of a poor representation of what the camera can do. I haven't had much time to look at this yet, but you'd think it should be possible to take a picture directly from the camera to get better quality.

     

    ps, sorry, I noticed your question was also about how to tell what kind of camera it is, and I have no clue! it just sorta worked out of the box with the given samples.

     

    Cheers,

    -Nico

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  • 0 in reply to ntewinkel

    Ahhh, thank you! This does indeed help as since you're getting color it means the camera is color (I can't imagine my board was stuffed with the incorrect part) and there's something wrong with my code...

     

    So, I shall have to dig into that and see if I can figure out what's up.

     

    If anyone has any suggestions as to which registers might be the culprit I would appreciate it!

     

    Thank you!

     

    Shannon