GY-63_MS5611/libraries/MCP23008

MCP23008

Arduino library for MCP23008 8 channel I2C port expander.

Description

This library gives easy control over the 8 pins of a (I2C) MCP23008 chip.

This IC is strongly related tot the MCP23017 I2C port expander - https://github.com/RobTillaart/MCP23017_RT Programming Interface is kept the same as much as possible.

Since 0.1.1 the digitalWrite(pin, value) is optimized. If a pin is not changed it will not be written again to save time.

Related

16 bit port expanders

• https://github.com/RobTillaart/MCP23017_RT
• https://github.com/RobTillaart/MCP23S17
• https://github.com/RobTillaart/PCF8575

8 bit port expanders

• https://github.com/RobTillaart/MCP23008
• https://github.com/RobTillaart/MCP23S08
• https://github.com/RobTillaart/PCF8574

Interface

#include "MCP23008.h"

Constructor

• MCP23008(uint8_t 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(uint8_t sda, uint8_t scl) for ESP32, returns true if successful.
• bool isConnected() returns true if connected, false otherwise.

Single pin interface

• bool pinMode(uint8_t pin, uint8_t mode) pin = 0..7, mode = INPUT, OUTPUT. Returns true if successful.
• bool digitalWrite(uint8_t pin, uint8_t value) pin = 0..7, value = LOW(0) HIGH (!0). Returns true if successful.
• uint8_t digitalRead(uint8_t pin) pin = 0..7, returns LOW or HIGH, might set the lastError();
• bool setPolarity(uint8_t pin, bool reversed) pin = 0..7, set reversed flag. Returns true if successful.
• bool getPolarity(uint8_t pin, bool &reversed) pin = 0..7, reads reversed flag. Returns true if successful.
• bool setPullup(uint8_t pin, bool pullup) pin = 0..7, set pull-up flag. Returns true if successful.
• bool getPullup(uint8_t pin, bool &pullup) pin = 0..7, reads pull-up flag. Returns true if successful.

8 pins interface

• bool pinMode8(uint8_t value) value = 0..255. Returns true if successful.
• bool write8(uint8_t value) value = 0..255. Returns true if successful.
• uint8_t read8() reads 8 pins into one byte.
• bool setPolarity8(uint8_t mask) sets polarity for 8 channels at once. Returns true if successful.
• bool getPolarity8(uint8_t &mask) reads polarity of 8 channels at once. Returns true if successful.
• bool setPullup8(uint8_t mask) sets pull-up for 8 channels at once. Returns true if successful.
• bool getPullup8(uint8_t &mask) reads pull-up for 8 channels at once. Returns true if successful.

Error codes

If one of the above functions return false, there might be an error.

• int lastError() Above functions set an error flag that can be read with this function.
  Reading it will reset the flag to MCP23008_OK.

DESCRIPTION	VALUE
MCP23008_OK	0x00
MCP23008_PIN_ERROR	0x81
MCP23008_I2C_ERROR	0x82
MCP23008_VALUE_ERROR	0x83
MCP23008_PORT_ERROR	0x84

Operation

See examples.

Future

• keep in sync with MCP23017