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Flashing STM32 with USART over audio

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thesame:

--- Quote from: magic on August 16, 2020, 05:44:54 am ---There is already AC coupling inside (almost?) every soundcard input, adding another AC coupling doesn't change much. The only solution to it is that your RX software has to ignore the DC level and look for rising and falling edges, wherever they are.

--- End quote ---
The thing is that the audio input provides 5V dc offset and I'm trying to block it from the STM32 output.

magic:
So put a capacitor between them. There is already another capacitor in the soundcard between the 5V biased input and the ground-referenced ADC.

Because of that internal capacitor, the software has to be able to deal with AC coupling and DC drift anyway. That's all I said.

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