Incorrect I2C decoding in AD2

[miv2k]

Hi,

For some reason I'm seeing a pretty consistent I2C decoding error when trying to e.g. read 7 bytes from slave. Consider the attached screenshot for instance...

The byte sequence that's being sent (read by master and confirmed by another decoder in DSO) is 0x56, 0x35, 0x21, 0x06, 0x11, etc. Waveforms Logic Analyzer gets out of sync after reading 0x21, and I can't quite understand why.

The waveform seems correct, all SDA changes happen when SLC is low, and if Waveforms was just interpreting SDA when SLC was high, it would indeed get 0x06 followed by an ACK. Yet it shows an error right where the first 0 bit of 0x06 is.

There seems to be a small SDA glitch before sending the last bit of 0x06, but it happens when SLC is low, and should've been ignored.

Interestingly, Protocol Analyzer in Waveforms works just fine and decodes this:

Start, hD0 [ h68 | WR ], h00, Stop
Start, hD1 [ h68 | RD ], h56, h35, h21, h06, h11, h10, h24 NACK, Stop

Any idea what may be going on here? It's Waveforms 3.23.4.

Thanks!

 

 

Edited October 12 by miv2k
Added Waveforms version

[attila]

Hi @miv2k

It looks like it starts interpreting it as I3C.
I managed to reproduce. It will be fixed next week.

[attila]

Hi @miv2k

It is corrected here:

 

[miv2k]

I can confirm that 3.23.23 is working just fine now.

Thanks a lot!