26 lines
1 KiB
ReStructuredText
26 lines
1 KiB
ReStructuredText
Wire (I2C Master and Slave)
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===========================
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The RP2040 has two I2C devices, ``i2c0 (Wire)`` and ``i2c1 (Wire1)``.
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The default pins for `Wire` and `Wire1` vary depending on which board you're using.
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(Here are the pinout diagrams for `Pico <https://datasheets.raspberrypi.org/pico/Pico-R3-A4-Pinout.pdf>`_
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and `Adafruit Feather <https://learn.adafruit.com/assets/100740>`_.)
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You may change these pins **before calling Wire.begin() or Wire1.begin()** using:
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.. code:: cpp
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bool setSDA(pin_size_t sda);
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bool setSCL(pin_size_t scl);
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Be sure to use pins labeled ``I2C0`` for Wire and ``I2C1`` for Wire1 on the pinout
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diagram for your board, or it won't work.
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Other than that, the API is compatible with the Arduino standard.
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Both master and slave operation are supported.
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Master transmissions are buffered (up to 128 bytes) and only performed
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on ``endTransmission``, as is standard with modern Arduino Wire implementations.
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For more detailed information, check the `Arduino Wire documentation <https://www.arduino.cc/en/reference/wire>`_ .
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