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Thanks for reaching out!
I would like to ask you which image you are using as well as if you are using mraa to code your project and if so, which version of this library are you using?
Is it possible for you to share a picture of the oscilloscope measurement? It would also be of much help if you could share your code in here, or at least a simplified version of the code that simply lets you replicate the issue.
I will be waiting for your response.