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Clock Configuration Issue for Sound Acquisition with STM32G473VET6 and IMP34DT05TR

Forum|Forum|1 year ago
October 12, 2024
7 replies
3026 views

Hello,

I am currently working on a sound acquisition project using the STM32G473VET6 microcontroller and IMP34DT05TR microphone. I am encountering an issue while trying to configure the Serial Audio Interface (SAI) clock frequency. My target frequency is 2.048 MHz, but CubeMX is not allowing me to set this value. Currently, the clock frequency is set at 12 MHz.

I would appreciate any guidance on how to configure the SAI clock to 2.048 MHz or any potential workarounds to achieve this configuration.

Best,

AiROT

This topic has been closed for replies.

Best answer by waclawek.jan

Use the MCKDIV divider in SAI.

JW

Super User

> My target frequency is 2.048 MHz, but CubeMX is not allowing me to set this value

Show.

JW

AiROTAuthor

Associate II

Here's the screenshots for the same!

Clock Frequency (1).jpeg Clock Frequency (2).jpeg

Super User

SAI uses integer divider. You can't divide 24MHz to 2.048MHz. 2MHz should be viable though.

JW

AiROTAuthor

Associate II

We are getting error "PLLQ output frequency is currently set to 2Mhz, must be >= 8Mhz and =<150Mhz." Please see the screenshot.

How do we modify this limit?

Error (2).jpeg Error (1).jpeg

waclawek.janBest answer

Super User

Use the MCKDIV divider in SAI.

JW

AiROTAuthor

Associate II

Will try and update you!

AiROTAuthor

Associate II

@waclawek.jan thanks, it worked!