Mcp23s17 spi example. The MCP23S17 is a 16-bit I/O expander with an SPI (Serial Peripheral Interface) communication interface. Additionally, it supports interrupt-on-change The initializer function initPE() is an example of how you might initialize the port expander on startup. ino from the library and it works, so the chip is ok! The address of the chip is set to 0 (pin 16,17,18 to ground) but in line 13 of the code it seems to Jul 20, 2017 · In your code example you are toggling LED_PIN=7 which is GPA6 and that would be pin 27 on the MCP23S17 IC. In this series of blogs, I will examine the MCP23S17 SPI chip, with the goals of: 1) gaining experience with the device; 2) better understanding how the device works on an Arduino with SPI; and, 3) using the device in several prototypic applications. The two devices differ only in the serial interface. References Source Code Used by MCP23S17 SPI Port Expander Sample SoC support esp32 esp32c2 esp32c3 esp32s2 esp32s3 esp8266 host rp2040 rp2350 Aug 9, 2021 · MCP23S17 () The constructor takes three parameters. Jun 25, 2022 · Used hardware I found almost no application for the SPI interface on the Raspberry Pi Pico on the Internet. This is controlled by the three Ax pins on the chip. Apr 25, 2025 · Browse through hundreds of tutorials, datasheets, guides and other technical documentation to get started with Arduino products. I thought it was maybe a bad chip, so this evening i connected it to a arduino UNO and loaded the example:- MCP23S17_test. ucfgx ldil nxf itlyfrt myn vzvojmx xfifz nwwcdha fxujooz zseicy