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firmware/c: use 200 MHz clock for pio#40

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erdnaxe wants to merge 1 commit intonewaetech:mainfrom
erdnaxe:200mhz_pio
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firmware/c: use 200 MHz clock for pio#40
erdnaxe wants to merge 1 commit intonewaetech:mainfrom
erdnaxe:200mhz_pio

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@erdnaxe erdnaxe commented Aug 22, 2025

Since February, the RP2040 is officially certified to run at 200 MHz.
This patch proposes to use this frequency for the pio, making the fast trigger mode a bit more precise (5ns precision rather than 8ns).

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