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SPI-bug-demo

Description

Demonstrates a bug in the Zephyr SPI implementation on STM32WL. Whether other STM32 platforms are affected is still unknown. The corresponding issue is zephyrproject-rtos/zephyr#50426.

Reproducing the bug

picture of hardware-setup

  1. Connect a LIS12DW12 accelerometer to a NUCLEO-WL55JC STM32WL Nucleo-64 board over the Arduino SPI, using
  • Arduino Pin D8 (GPIO) for LIS12DW12 CS
  • Arduino Pin D11 (MOSI) for LIS12DW12 SDA/SDI/SDO
  • Arduino Pin D12 (MISO) for LIS12DW12 SA0/SDO
  • Arduino Pin D13 (SCK) for LIS12DW12 SCL/SPC
  1. Compile the project by running
west build -p auto -b nucleo_wl55jc . -- -DSHIELD=lis2dw12
  1. Flash it using west flash or west flash --runner stm32cubeprogrammer.
  2. Power-cycle the Nucleo board

Observed behaviour

After power-on, the NUCLEO LED2 flashes shortly, indicating that the LIS12DW12 initialization took place.

After two seconds, LED2 lights up and stays on; indicating that the application hangs in the sensor-reading-phase.

When attaching the Debugger using west attach, a backtrace (type bt) shows the following: screenshot of GDB screenshot of GDB