[mbed] I2C fails in a consistent pattern

RE: [mbed] I2C fails in a consistent pattern

Hieu — Fri, 11 Mar 2016 10:59:47 GMT

None. I do not use that socket. The sensors are the four ICs lining up near the edge of the X-Nucleo shield. They are accessed via an I2C bus, which is what I am trying to do.

RE: [mbed] I2C fails in a consistent pattern

awneil — Fri, 11 Mar 2016 10:54:58 GMT

I mean the 24-pin DIL socket

RE: [mbed] I2C fails in a consistent pattern

Hieu — Fri, 11 Mar 2016 10:47:43 GMT

Sorry I guess I could have embedded an URL there instead of giving just the part number. While I make that quick edit I didn't have time to think much about it.

However I don't understand your question. What do you mean by socket? In case this answer your confusion, both nRF51 and the X-Nucleo shield has Arduino UNO Rev 3 compliance connectors. Power would be supplied correctly to the shield and I2C lines would be aligned correctly as well.

Going to update the questions with all these information now.

RE: [mbed] I2C fails in a consistent pattern

awneil — Fri, 11 Mar 2016 10:19:51 GMT

Sounds like you had some bad and/or missing connections with your jumper wires.

Remember that the X-Nucleo is an ST product; nothing to do with Nordic. This is the Nordic forum, so don't assume that people here will know anything about it. Provide a link so that we can see what you're talking about.

I presume you mean this: www.st.com/.../PF261191 ?

But what are you plugging into the socket ... ?

RE: [mbed] I2C fails in a consistent pattern

Hieu — Fri, 11 Mar 2016 09:24:18 GMT

I have updated the question now. My guess is that this would be more of a hardware issue.

RE: [mbed] I2C fails in a consistent pattern

Hieu — Fri, 11 Mar 2016 09:17:15 GMT

I actually found out something new, going to work on updating the question post now.

RE: [mbed] I2C fails in a consistent pattern

Hieu — Fri, 11 Mar 2016 09:16:51 GMT

I am sorry I was a bit ambiguous at that part. I mean the firmware itself runs fine. Functions are called correctly. UART debugging messages are printed out as expected. However, I2C communication keep failing with a no slave ack.

RE: [mbed] I2C fails in a consistent pattern

awneil — Fri, 11 Mar 2016 08:39:03 GMT

What do you mean. "it runs on the nRF51-DK with no problem"? So what are you running on when you do get the problem?

IF it's consistent, it should be easy to debug: just look at what happens when it "works" and what happens when it fails - and spot the difference.

For the symptoms you describe, I would be looking for timing issues and incomplete initialisation...