This library provides full control over the Microchip's MCP23017, including interrupt support.
- Individual pins read & write
- Ports read & write
- Registers read & write
- Full interrupt support
Unlike most Arduino library, no default instance is created when the library is included. It's up to you to create one using the appropriate I2C address based on MCP23017 A0, A1 and A2 pins wirings.
Available addresses go from 0x20 to 0x27, allowing up to 8 MCP23017 on the same I2C bus.
#include <Arduino.h>
#include <MCP23017.h>
MCP23017 mcp = MCP23017(0x24);Additionaly, you can specify the Wire instance to use as a second argument. For instance MCP23017(0x24, Wire1).
See included examples for further usage.
GPA7 or GPB7 should not be used as inputs despite what the configuration registers allow. As stated by Microchip, it can lead to SDA signal corruption or even malfunction in the host bus under some conditions.
Major renames have been performed in v2.0.0 to improve compatibility with a variety of platforms. Existing code will break when you update from version v1.x.
| Name in v1.x | Name in v2.x |
|---|---|
MCP23017_PORT |
MCP23017Port |
MCP23017_REGISTER |
MCP23017Register |
MCP23017_INTMODE |
MCP23017InterruptMode |
In addition to this, every member of the MCP23017Register enum were renamed to avoid possible conflicts with macro definitions. GPIOA was renamed to GPIO_A, INTCAPA to INTCAP_A and so on...