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The Adafruit MPC23017 library is not compatible with Teensy4.

Status: Open.

#106 In adafruit/Adafruit-MCP23017-Arduino-Library;

· rolfdegen opened on Jun 8, 2025

If the I2C-Bus is not available for any reason 32 Bytes of free heap gets consumed each cycle..

Status: Open.

#104 In adafruit/Adafruit-MCP23017-Arduino-Library;

· eXtr3me26 opened on Feb 22, 2025

Setting (digitalWrite) pin y, unsets pin x

Status: Open.

#102 In adafruit/Adafruit-MCP23017-Arduino-Library;

· FunDeckHermit opened on Jul 23, 2024

ESP32 LAN8720 MCP23017 cant compile with Asyncwebsockets

Status: Open.

#101 In adafruit/Adafruit-MCP23017-Arduino-Library;

· MeisterQ opened on May 29, 2024

Not working using new Arduino Nano ESP32 development board

Status: Open.

#100 In adafruit/Adafruit-MCP23017-Arduino-Library;

· nestorcereno opened on Mar 5, 2024

GPIO7 bug hacking

Status: Open.

#96 In adafruit/Adafruit-MCP23017-Arduino-Library;

· siteswapjuggler opened on Jul 20, 2023

HELP - Multiple MCP23S17

Status: Open.

#95 In adafruit/Adafruit-MCP23017-Arduino-Library;

· MarcFinns opened on Jun 17, 2023

Bulk set gpio direction support

Status: Open.

#94 In adafruit/Adafruit-MCP23017-Arduino-Library;

· drakejest opened on Apr 8, 2023

Support boards with only SPI or Wire (I2C)

Status: Open.

#92 In adafruit/Adafruit-MCP23017-Arduino-Library;

· caternuson opened on Nov 29, 2022

Adafruit_MCP23XXX::digitalWrite should read/modify/write the output register, not the input register

Status: Open.

#91 In adafruit/Adafruit-MCP23017-Arduino-Library;

· JDaughenbaugh opened on Nov 9, 2022

Please include an example for using multiple mcp chips

Status: Open.

#90 In adafruit/Adafruit-MCP23017-Arduino-Library;

· businescat opened on Oct 16, 2022

MCP23018 support

Status: Open.

#65 In adafruit/Adafruit-MCP23017-Arduino-Library;

· Donkie opened on Jun 27, 2021