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I2C weird read value return in STM32F429I Disco

Question asked by maskey.abhas on Feb 16, 2015
Latest reply on Feb 16, 2015 by Osto
Hey everyone,

I am trying to get the Device ID of an I2C connected image sensor for our project but somehow the value keeps returning 0x00. I did recieve the Device ID (0xA0) a couple of times but could not do so once I turned off the sensor and turned it back on. I read in one of the I2C related forum that the ground might be an issue, so changed that too using a single source supply instead of the double source I was using before. No change. 

I placed some external resistors and experimented with it too, same. 

I need a couple of pictures to explain what I have managed to sniff out from the oscilloscope so far but the problem with this forum is that the image size is limited to 100kb which, frankly, is really annoying as my resized picture ends up coming at around 130kb. Any smaller than that, the text in the picture are unreadable.

I am really sorry, but I have posted the question up in blogger to allow me to illustrate the problem properly.

If you have any other suggestions, feel free to let me know how I can put forth the question.
  
Here's the link to the post:
[HERE]

If you feel like you can help me out, please do reply here so that people with similar issues might benefit later on. 

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