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

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

Andrew Lentvorski — Mon, 19 Feb 2018 12:09:03 GMT

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.

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

Jørgen Holmefjord — Mon, 19 Feb 2018 11:59:15 GMT

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

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

Andrew Lentvorski — Mon, 19 Feb 2018 07:09:18 GMT

Any ideas? I'm really stumped as to how to do this.