https://devzone.nordicsemi.com/f/nordic-q-a/19390/problems-with-i2c-mma8652fcHello, we developed a custom board using the nRF52832. We are having problems communicating with the mma8652fc accelerometer using I2C. We also have a Rigado BMD-200 EVAL board (based on nRF51822), which has the same accelerometer on. With the Rigadoen-USTelligent Community 13Sun, 05 Feb 2017 23:39:58 GMThttps://devzone.nordicsemi.com/thread/75245?ContentTypeID=1Sun, 05 Feb 2017 23:39:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6c7fdb61-082f-42ca-8ce1-c7cd2d82f97bMartin K<p>Thanks for all the suggestions. We managed to debug properly, and came to the conclusion that that the SDA pin is probably connected to the GND pin (right next to it).</p> <p>Setting the pin SDA as high, still reads as 0.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75244?ContentTypeID=1Sun, 05 Feb 2017 12:57:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2a8fd8df-d0d1-4141-9f9b-39144007765bMichael Antwih<p>How are you defining the address?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75242?ContentTypeID=1Fri, 03 Feb 2017 10:10:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8f6fe116-35aa-4afe-abdc-7a4d48c74142Ole Bauck<p>Go buy yourself a logic analyzer or oscilloscope, or borrow some. If you are developing hardware this is mandatory to have in your inventory.</p> <p>Determining if the bits are actually clocked out on the lines would help finding the issue.</p> <p>As Michael said you can also go into the debugger and check what happens. It might be that a function is returning an error code and the device is resetting, see <a href="https://devzone.nordicsemi.com/question/60125/my-device-is-freezing-and-restarting/">here</a>.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75243?ContentTypeID=1Fri, 03 Feb 2017 00:28:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:baa97b9b-94fe-472c-a07e-b36357cf1ec4Michael Antwih<p>Make sure optimization is turned off and then set break point on the error handler function. Which IDE are you using?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75241?ContentTypeID=1Thu, 02 Feb 2017 20:29:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0dd494d3-c778-4516-8d30-cfa75abfbc5eMartin K<p>Sadly we don&#39;t have a logic analyzer. GNDA is just common GND, it&#39;s just marked this way in the schematic.</p> <p>The debugger points us to some weird areas of code that are not being executed at all. I can post some code if it would help.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75240?ContentTypeID=1Wed, 01 Feb 2017 16:20:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1f94733a-f603-4ef0-8568-dfd23580bea3Michael Antwih<p>Also when you step thru the code and you throwing any errors? In debugger mode you used be able to review the TWI/I2C register with either Keil or gdb.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75239?ContentTypeID=1Wed, 01 Feb 2017 16:15:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c0d239c6-936b-47be-a21b-060502dfaee7Michael Antwih<p>Do you have an logic analyzer? Do you know if the bits are making it out to the bus? Common grounds? I know that is a silly question but I noticed you have GNDA instead of just GND.</p><div style="clear:both;"></div>