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Free up GPIO with DAC+ DSP

Hello there

I have the annoying little problem that for my usecase one GPIO is missing.

Now I am searching for solutions...

Are there any functionalities I can disable in the DSP in order to gain another GPIO? (DAC+ DSP)

The selfboot is set via jumper anyway isn't it?

If there really is no other way is it possible to connect another device to the i2c bus without disturbing the DAC+ DSP? I guess the PI is Master?
I would use nodeRed in order to access the i2c bus, how can I ensure to not disturb the correct function of the DSP? (https://flows.nodered.org/node/node-red-contrib-i2c)

Thank you very much beforehand!
Greetings

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