BQ79606A-Q1: Cannot establish communication between two devices with Arduino

Hello,

For a research project I've got two eval boards (BQ79606EVM-897). I also got the sample code for code composer studio.

I have an Arduino Mega as host to read the registers of the BQ79606A-Q1.

The jumpers of the first eval board are configured as base device, the second one as a stack device.

I copied parts of the sample code and I am able now to read and write registers of the base device (see code below).

My problem is, I cannot establish a connection to the second eval board.

Already during the Auto-Addressing I cannot read back the address of the second board.

How can I debug the daisychain connection between the two boards? Am I missing something to properly write/read from the second board?

Result:

Prog Start
Board 0=00
Board 1=ff
Addressing done

Thank you for your support and regards,
Valentin