EMB1428Q: how can i know the EVM is balancing

Part Number:EMB1428Q

Hi，dear

I‘m using 1402EVM to test battery active balance function.The 1402EVM board is powered on and starts working,  LED  D15  lights up.

I use a other MCU connect to EVM, not TMS570. I am writing my own code with reference to the code of TMS570. and I set a fix channel to balance.

The Phenomenon is LED D4  is blinking，with subtle sounds.

So, I want to know how can i know the channel is balancing ？Another question，how to connect the J2 connector with MCU's SPI on the EVM?

regards.