I2C Issue with filtering Pins on Digital Discovery 2

[Stanko]

Hi, there seems to be an issue with the api for setting up I2C DIOs. 

The example works with DIO 0 and 1 but if i want to use 24 and 25, then i get the following error:
Error: i2c -> open -> Invalid channel index provided
FDwfDigitalI2cSclSet


attached you can find the code example
 

 

test_i2c_poti_new.py

[attila]

Hi @Stanko

The Digital Discovery has 16 DIOs and 24 DINs.
Only the DIOs can be used for protocols. These are labels as DIO24-39 and in programming used with 0 base indexing, 0=DIO24, 1=DIO25...

[Stanko]

hi @attila,

thanks for the insight. The labels and how they relate to the indexing is a bit confusing.

however i still get a NAK error. When i communicate over the GUI everything is fine. 

GUI:


trying to do the same with python I am getting  a NAK error





Is there a way, maybe through some logger to read back the set settings and on which GPIO actually is sent what.

In the gui I am seeing the full message sent...

Edited September 7, 2023 by Stanko

[Stanko]

the warning message is also not helping a lot. what means NAK: index "c_long(1)'? I would appriciate any advice on how to troubleshoot the issue.

[attila]

Hi @Stanko

You are getting NAK on the first word, at the address.
Make sure the address is correct, is 8 bit format, see the examples.

[Stanko]

hi @attila,

Thank you, issue is resolved. I had to shift the 7bit address 1 bit to the left '0x28 <<1' for the write operation. Now it is working.

A debugging feature, like a logger. which displayes the raw messages sent would be nice to have. Do you have something like this, which i could use for the future?
Similar like we see this in the gui:

[attila]

Hi @Stanko

The written address and data should be what it was specified. It returns error or nak index and the read data.