Two-wire interface does not work together with Bluetooth

RE: Two-wire interface does not work together with Bluetooth

Jarmo — Wed, 12 Mar 2014 14:05:52 GMT

On the chip there was actually QFAAC0, so it's actually the first revision...

RE: Two-wire interface does not work together with Bluetooth

Jarmo — Wed, 12 Mar 2014 13:18:27 GMT

Thanks, our order code is 949-NRF51822-QFAA-R7, so it looks like it is the second revision, right?

RE: Two-wire interface does not work together with Bluetooth

Ole Morten — Wed, 12 Mar 2014 12:35:56 GMT

The different revisions of the chip is shown in both the PAN and the PCN, and you can identify a chip by looking at its chip markings.

In summary, on a 256 kB nRF51822 anything later than QFAAFA on the second line are second revision chips.

RE: Two-wire interface does not work together with Bluetooth

Jarmo — Wed, 12 Mar 2014 09:58:12 GMT

How can we check which revision we have in our Evaluation Board? Also, we have just ordered our custom PCBs and would need to check what is the revision of the chips that will be installed on them.

RE: Two-wire interface does not work together with Bluetooth

Jarmo — Tue, 11 Mar 2014 20:37:34 GMT

Thanks for the quick answer! I will examine the thing tomorrow.

RE: Two-wire interface does not work together with Bluetooth

Ole Morten — Tue, 11 Mar 2014 14:51:07 GMT

This has been covered at length here before, so I'd recommend you to browse around a little, for instance looking at this question, or one of the multiple others here.

However, I just finished a quick example of how the TWI can be used with the softdevice on second revision chips, and that example is available here, including a modified version of twi_hw_master.c, taking advantage of the working SHORTS on second revision chips.

If you use first revision chips, you should instead follow the suggested workaround in the question I linked to above, using the sd_ppi_* interface.