ChibiOS Free Embedded RTOS

I have a STM32F411CE (blackpill Board) with HSE=25MHz.
I selected M=15, N=144, P=4, Q=5, AHBP=1, APB1=2, APB2=1 which gives 60MHz System Clock and 48MHz USB Clock.
I've got the Error:

which comes from:

Chibios uses Timer 2 (32bit).
How can i fix this?

Thanks.
Robert

Never mind.
I found a solution with:
M=25, N=192, P=2, Q=4 which gives 96MHz System Clock and no error.
cheers.

Hi,

That assertion is about the system tick frequency defined in chconf.h, the frequency must be obtainable from the selected timer. Consider that the timer prescaler is 16 bits even on 32 bits timers.

Giovanni

Thanks for the reply. I don't understand.
With 60Mhz Timer freq and 10kHz Systick the prescaler could be 6000?
Why is this not obtainable?

25MHz / 15 is not an integer value, the preprocessor uses integer math and gives 1666666, after multiplying by 144 the result is 239999904.

Giovanni

Thank you for the explanation.
-robert