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GY-63_MS5611/libraries/MCP23017_RT
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rob tillaart 905cc407a7 0.2.3 MCP23017_RT
2021-06-06 19:58:43 +02:00
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.arduino-ci.yml 2021-01-29 2021-01-29 12:31:58 +01:00
library.json 0.2.3 MCP23017_RT 2021-06-06 19:58:43 +02:00
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MCP23017.cpp 0.2.3 MCP23017_RT 2021-06-06 19:58:43 +02:00
MCP23017.h 0.2.3 MCP23017_RT 2021-06-06 19:58:43 +02:00
README.md 0.2.3 MCP23017_RT 2021-06-06 19:58:43 +02:00

README.md

Arduino CI License: MIT GitHub release

MCP23017_RT

Arduino library for MCP23017 16 channel I2C port expander

Description

This library gives easy control over the 16 pins of a MCP23017 chip.

Interface

Constructor

  • MCP23017(address, TwoWire *wire = &Wire) constructor, with default Wire interface. Can be overruled with Wire0..WireN
  • bool begin() for UNO, returns true if successful
  • bool begin(sda, scl) for ESP32, returns true if successful
  • bool isConnected() returns true if connected, false otherwise

single pin interface

  • bool pinMode(pin, value) pin = 0..15, value = INPUT, OUTPUT, returns true if successful.
  • bool digitalWrite(pin, value) pin = 0..15, value = LOW(0) HIGH (!0), returns true if successful.
  • uint8_t digitalRead(pin) pin = 0..15

8 pins interface

  • bool pinMode8(port, value) port = 0, 1 value = 0..255, returns true if successful.
  • bool write8(port, value) port = 0, 1 value = 0..255, returns true if successful.
  • uint8_t read8(port) port = 0, 1

Error codes

  • int lastError() Above functions set an error flag that can be read withthis function. Reading it will reset the flag to MCP23017_OK.
DESCRIPTION VALUE
MCP23017_OK 0x00
MCP23017_PIN_ERROR 0x81
MCP23017_I2C_ERROR 0x82
MCP23017_VALUE_ERROR 0x83
MCP23017_PORT_ERROR 0x84

Future

Must

  • add pinMode16(), write16() and read16()
  • investigate PULL_UP register see begin() => pinMode() (breaking change)

Should

  • investigate caching for performance (readback)

Could

  • initial value (16 bit?) as begin parameter (breaking change)
    • depends on input output pullup etc?
  • investigate auto address increment?

Operation

See examples