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Update spi.rst link to Arduino docs (#3038)

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Fixes #3037
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Earle F. Philhower, III 2025-07-14 12:07:30 -07:00 committed by GitHub
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@ -16,7 +16,7 @@ SPI pinouts can be set **before SPI.begin()** using the following calls:
Note that the ``CS`` pin can be hardware or software controlled by the sketch. Note that the ``CS`` pin can be hardware or software controlled by the sketch.
When software controlled, the ``setCS()`` call is ignored. When software controlled, the ``setCS()`` call is ignored.
The Arduino `SPI documentation <https://www.arduino.cc/en/reference/SPI>`_ gives The Arduino `SPI documentation <https://docs.arduino.cc/language-reference/en/functions/communication/SPI/>`_ gives
a detailed overview of the library, except for the following RP2040-specific a detailed overview of the library, except for the following RP2040-specific
changes: changes: