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BluePill/BlackMagicProbe support for CSR Programming

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[Idea] Use open drain mode to directly talk to 1.8V logic

https://github.com/konsgn/BlueMagic/blob/e9f1c3a4243a2a7ab5aaef2a7d7afad281c1c389/csrspi.c#L72 Change `GPIO_CNF_OUTPUT_PUSHPULL` to `GPIO_CNF_OUTPUT_OPENDRAIN`, in this mode the STM32 pins won't output any voltage when the pin is "1". Connect CS, CLK, MOSI and MISO directly to the bluetooth...

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BluePill/BlackMagicProbe support for CSR Programming

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