Arduino API Deviations
======================

This section documents the differences between the standard Arduino Language Reference and `PSoC6-for-Arduino`.

ADC
---

Once a pin is configured and used as an ADC input, it may no longer be available for use with any other peripheral (e.g., PWM, I2C, SPI, GPIO, etc.).

The `PSoC6-for-Arduino` core does not support the following Arduino APIs:

.. code-block:: cpp

    void analogReadResolution(uint8_t bits)

This API is **not implemented** because the resolution is hardware-defined and fixed at 11 bits and the resolution cannot be dynamically reconfigured by firmware.

For applications requiring lower effective resolutions (e.g., 8-bit or 10-bit), users can manually scale the 11-bit ADC result in their application code by discarding the least significant bits (LSBs).


.. code-block:: cpp

    void analogReference(uint8_t mode)

Only the `DEFAULT` mode is supported and uses the internal reference voltage of the PSoC6 device, which is typically 3.3V.