Check HSE using MCO

[nikhil]

I am using STM32F405 mcu and 8MHz external crystal oscillator. I want to check if my external crystal oscillator is working properly. Is it possible to check HSE clock using MCO pins (PA8/PC9)?
I have set STM32_HSECLK to 8000000. Do I need to change any other parameter?
What should be the pin configuration for MCO pins in order to do this?

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Nikhil

[Abhishek]

Once you set MCO configuration in mcuconf.h, and set the appropriate GPIO port to Alternate function 0, you should be able to receive the system clock output on that particular pin.

Regards
Abhishek

[nikhil]

Hello,
Thanks for your answer.
Is there any option to select which clock (HSE, HSI, PLL) to recieve at MCO?


--
Nikhil

[Abhishek]

Yes, see this in mcuconf.h

Code: Select all

#define STM32_MCO1SEL                       STM32_MCO1SEL_HSI     // Select clock source here
#define STM32_MCO1PRE                       STM32_MCO1PRE_DIV1           // MCO = fClk / Prescale value
#define STM32_MCO2SEL                       STM32_MCO2SEL_SYSCLK
#define STM32_MCO2PRE                       STM32_MCO2PRE_DIV5

You have to modify these lines.

Regards
Abhishek