QUERY · ISSUE

STM32: machine.freq unsupported on F0, L0, L4 and WB

openby 459548764opened 2019-11-29updated 2019-12-02

port-stm32

When I set pyb.freq(30000000) it occurs an error that I can't change the frequency. How should I do?

CANDIDATE · ISSUE

ports/stm32: Can't change CPU frequency on NUCLEO_F401RE board

closedby dhylandsopened 2019-05-01updated 2019-05-02

port-stm32

Trying to change the frequency using the latest master causes a FATAL ERROR.

I tested using pyb and machine modules and tried various frequencies like 42 MHz and 64 MHz).

All attempts result in this:

MicroPython v1.10-290-g8402c26cf-dirty on 2019-05-01; NUCLEO-F401RE with STM32F401xE
Type "help()" for more information.
>>> machine.freq(42000000)

FATAL ERROR:
can't change freq

Originally brought up in the forum: https://forum.micropython.org/viewtopic.php?f=12&t=6365&p=36215

Assessment

S Sonnet · high

Both issues report machine.freq() failing with "can't change freq" on STM32 boards, but they target different MCU families. The candidate (#4737) is specific to STM32F401RE (F4 series), while the query (#5366) covers F0, L0, L4, and WB families. The F4 series is not listed in the query's scope, so they describe the same class of problem (missing or broken freq-change support) in different STM32 sub-families that likely have distinct clock tree implementations and separate fixes.

Suggested action

Link the two issues as related. Neither closes the other — the query (#5366) covers F0/L0/L4/WB and the candidate (#4737) covers F4. A maintainer investigating either should cross-reference the other for shared context on the broader machine.freq() gap across STM32 families.

STM32: machine.freq unsupported on F0, L0, L4 and WB

ports/stm32: Can't change CPU frequency on NUCLEO_F401RE board

Keyboard