SMBus Quick Read/Write on TWI (I2C) Unit?

[Andrew Lentvorski]

Is it possible to send an SMBus quick write and quick read using the TWI hardware?

The sequence is:

<START><ADDRESS><R/W><ACK><STOP>

I can send the address, but I don't seem to have an event that detects the ACK on the address without actually sending a byte.  (I can, however, detect a NACK just fine).

Thanks.

[Jørgen Holmefjord]

Hi,

Are you using nRF51 or nRF52? 

As you can see from the sequence diagrams of the TWI peripheral of the nRF52832 IC, you get a BB event after ACK in the read sequence, but no events in the write sequence. The TWIM peripheral does not give any events at all.

Best regards,
Jørgen

[Andrew Lentvorski]

I'm on the nRF52.  So, basically what you're saying is "No, you can't do that".

That's going to make communicating to my chip really miserable. 

On read, I seem to get a BB event but I also seem to get a garbage byte clocked out.  ie. the NRF_TWI_SHORTS_BB_STOP_MASK doesn't fire immediately after the address.  It's possible I screwed it up, but it's probably not worth running down if I can't do this on write anyway.

Thanks for the answer even though it's negative.