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stm32duino / Arduino_Core_STM32

STM32 core support for Arduino
https://github.com/stm32duino/Arduino_Core_STM32/wiki
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How to check the operating clock speed? #836

Closed xtream123 closed 4 years ago

xtream123 commented 4 years ago

Hi, How we can check the actual(or the set) operating CPU speed of the mcu via code function or in .h/.cpp file/board info?

I am using the Generic STM32F4xx (Black F407VET6) board and I want to maximize it operating CPU speed to 168MHz.

Thank you.

fpistm commented 4 years ago

Hi @xtream123 The current CPU Freq is avaible thanks F_CPU: https://github.com/stm32duino/Arduino_Core_STM32/blob/8110ed411be152abdfce4ce8dae1f090c2e3359d/cores/arduino/stm32/stm32_def.h#L58

HAL RCC ensures the SystemCoreClock always updated to the current frequency.

The clock config is available in the variant.cpp. Here is the clock config for the Black F407: https://github.com/stm32duino/Arduino_Core_STM32/blob/d2ebcd532164a2ed2f74f9337bd86fab766ea133/variants/BLACK_F407XX/variant.cpp#L187

You can redefine it as it is a weak function.

fpistm commented 4 years ago

Note that I think it should already running at max speed.

xtream123 commented 4 years ago

Thank you @fpistm . I will take test it now and let you know my result.

xtream123 commented 4 years ago

I have checked the file and it looks good, I counter check the clock config with STM32CubeMX it seems okay.

I also test the F_CPU using : Serial.println(F_CPU);

Output: 168000000

and it seems okay.

Thank you.

fpistm commented 4 years ago

welcome