ADAU1701 with MCU STM32 fail to work .


I had took the advice to use a MCU to protect the ADAU 1701 program. After we done the design and code the firmware. We build the PCB board with AMP and then we ran into the problem that the MCU is not boot ADAU at all. There is no I2C be send to the ADAU? Our engineer can not seems to find out why? I had two MCU ST32 engineer looked the code and both say that is right!! 

One thing I find odd is that the board is actually playing sound very very quiet. And the weirdest part is that it don't need MCU firmware as I erased the firmware and that ADAU still can play music but very very quiet. 

I share the schematic here so if anyone can help ? 

[edited by: Tomdy at 10:37 AM (GMT 0) on 13 Jun 2019]