IIS3DWB return zero

[FAsch]

Hi,

I'm trying to get an IIS3DWB up and running. If I read the register "WHO_AM_I", however, I only get "0" back! The SDO signal changes from "1" to "0" after 8 clk cycles and only changes again when CS becomes high.

The IIS3DWB data sheet does not contain much information regarding the SPI interface.

STM32 SPI config:

Motorola frame format

MSB First

Baud rate = 2.6MBit / s

CPOL = high

CPHA = 2 edge

Pull-up on

4-Wire

Can someone give me a hint what the problem could be?

greetings

Florian

[Eleon BORLINI]

Hi @FAsch​ , you don't need pull-up on in SPI mode. The other configurations seems ok. Can you share the pattern analyzer output? And did you check the code to be compliant with ST open C drivers for IIS3DWB? Regards