.. SPDX-License-Identifier: Apache-2.0
.. Copyright 2022 Martin Schröder <info@swedishembedded.com>
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   Training: https://swedishembedded.com/tag/training

Introduction
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MCP23S17 is a 16-Bit I/O Expander with serial interface. The 'S' version of the
chip comes with an SPI interface.