nucleo_g431rb: Blinky too slow / wrong clock setup?

[martinjaeger]

Describe the bug
The LED is on approx. 15 times per minute (measured with stop watch), so it is 2 times slower than expected. On = off time in blinky app is set to 1 second.

To Reproduce
Steps to reproduce the behavior:

1. west build -b nucleo_g431rb samples/basic/blinky/
2. west flash

Impact
As I'm dealing with energy measurement in my application, the energy will most probably be wrong by the same factor as the blinky interval is wrong.

Environment:

• OS: Linux 5.4.2-1-MANJARO zephyr-master_fork #1 SMP PREEMPT Thu Dec 5 09:55:57 UTC 2019 x86_64 GNU/Linux
• Toolchain: West v0.6.3, Zephyr SDK v0.10.3
• Commit SHA: ac09bb3

Additional context
I double-checked the clock and PLL configuration in nucleo_g431rb_defconfig vs. ST reference manual already and could not find any mistake.

[FRASTM]

This is due to a AHBPrescaler not correct in the LL_PLL_ConfigSystemClock_HSI() function

[martinjaeger]

Great that you found the reason. So will you provide a fix?

[FRASTM]

yes, in progress, I wil attach the PR which is in the Cube

[FRASTM]

Refer to stm32cube: stm32g431: wrong clock setup zephyrproject-rtos/hal_stm32#34

[martinjaeger]

Refer to stm32cube: stm32g431: wrong clock setup #34

Don't understand what exactly you are referring to. Was that a commit / PR? Number 34 doesn't seem related to our problem.

[FRASTM]

Sorry, refer to Refer to stm32cube: stm32g431: wrong clock setup zephyrproject-rtos/hal_stm32#34