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/*==============================================================================================================*
@file PCA9557.h
@author Patryk Wagner
@license MIT (c) 2016 Nadav Matalon
PCA9557 Driver (8-Channel GPIO I2C Expander) based on Madav Matalon PCA9536 driver
Ver. 1.0.0 - First release (16.05.18)
*===============================================================================================================*
INTRODUCTION
*===============================================================================================================*
The PCA9557 is a 8-Channel GPIO Expander with a hardware I2C interface.
The PCA9557's 8 channels (or IO pins) can be controlled as a single unit or individually in terms of their
Mode (INPUT /OUTPUT) and Polarity (NON-INVERTED INPUT / INVERTED INPUT). The pins' states (LOW / HIGH) can
be read (in INPUT mode) or written (in OUTPUT mode).
This library contains a complete driver for the PCA9557 exposing all the above functionality.
*===============================================================================================================*
I2C ADDRESS
*===============================================================================================================*
The PCA9557 has a single I2C address (factory hardwired):
PART DEVICE I2C ADDRESS PART
NUMBER (BIN) (HEX) (DEC) MARKING
PCA9557D 01000001 0x41 65 PCA9557
*===============================================================================================================*
REGISTER POINTERS
*===============================================================================================================*
REG_INPUT 0x00 // Input Port Register (R) B00000000 (Default)
REG_OUTPUT 0x01 // Output Port Register (R/W) B00000001
REG_POLARITY 0x02 // Polarity Inversion Register (R/W) B00000010
REG_CONFIG 0x03 // Configuration Register (R/W) B00000011
*===============================================================================================================*
REGISTER 0: INPUT REGIASTER - READ ONLY (0 = LOW / 1 = HIGH)
*===============================================================================================================*
DEFAULT (WITH NO EXTENRAL INPUT SIGNAL CONNECTED): 'HIGH' (ALL IO PINS HAVE WEAK PULL-UP RESISTORS)
DEFAULT
PIN_IO0 BIT 0 1
PIN_IO1 BIT 1 1
PIN_IO2 BIT 2 1
PIN_IO3 BIT 3 1
PIN_IO4 BIT 4 1
PIN_IO5 BIT 5 1
PIN_IO6 BIT 6 1
PIN_IO7 BIT 7 1
*===============================================================================================================*
REGISTER 1: OUTPUT REGIASTER - READ / WRITE (0 = LOW / 1 = HIGH)
*===============================================================================================================*
DEFAULT
IO0 BIT 0 1
IO1 BIT 1 1
IO2 BIT 2 1
IO3 BIT 3 1
IO4 BIT 4 1
IO5 BIT 5 1
IO6 BIT 6 1
IO7 BIT 7 1
*===============================================================================================================*
REGISTER 2: POLARITY REGIASTER - READ / WRITE (0 = NON-INVERTED / 1 = INVERTED)
*===============================================================================================================*
DEFAULT
PIN_IO0 BIT 0 0
PIN_IO1 BIT 1 0
PIN_IO2 BIT 2 0
PIN_IO3 BIT 3 0
PIN_IO4 BIT 4 0
PIN_IO5 BIT 5 0
PIN_IO6 BIT 6 0
PIN_IO7 BIT 7 0
*===============================================================================================================*
REGISTER 3: CONFIGURATION - READ / WRITE (0 = OUTPUT / 1 = INPUT)
*===============================================================================================================*
POWER-UP DEFAULT: ALL PINS ARE SET AS 'INPUT' (1)
DEFAULT
PIN_IO0 BIT 0 1
PIN_IO1 BIT 1 1
PIN_IO2 BIT 2 1
PIN_IO3 BIT 3 1
PIN_IO4 BIT 4 1
PIN_IO5 BIT 5 1
PIN_IO6 BIT 6 1
PIN_IO7 BIT 7 1
*===============================================================================================================*
LICENSE
*===============================================================================================================*
The MIT License (MIT)
Copyright (c) 2016 Nadav Matalon
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without
limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*==============================================================================================================*/
#include <Arduino.h>
#include <Wire.h>
const byte DEV_ADDR = 0x18;//0b0011010R/W
const byte NUM_BYTES = 0x01;
const byte ALL_INPUT = 0xFF;
const byte ALL_OUTPUT = 0x00;
const byte ALL_LOW = 0x00;
const byte ALL_NON_INVERTED = 0x00;
const byte ALL_HIGH = 0xFF;
const byte ALL_INVERTED = 0xFF;
const byte COM_SUCCESS = 0x00;
typedef enum:
byte
{
REG_INPUT = 0, // default
REG_OUTPUT = 1,
REG_POLARITY = 2,
REG_CONFIG = 3
} reg_ptr_t;
typedef enum:
byte
{
IO0 = 0,
IO1 = 1,
IO2 = 2,
IO3 = 3,
IO4 = 4,
IO5 = 5,
IO6 = 6,
IO7 = 7
} pin_t;
typedef enum:
byte
{
IO_OUTPUT = 0,
IO_INPUT = 1
} mode_tt;
typedef enum:
byte
{
IO_LOW = 0,
IO_HIGH = 1
} state_t;
typedef enum:
byte
{
IO_NON_INVERTED = 0,
IO_INVERTED = 1
} polarity_t;
class PCA9557
{
public:
PCA9557();
~PCA9557();
byte ping();
byte getMode(pin_t pin);
byte getState(pin_t pin);
byte getPolarity(pin_t pin);
void setMode(pin_t pin, mode_tt newMode);
void setMode(mode_tt newMode);
void setState(pin_t pin, state_t newState);
void setState(state_t newState);
void toggleState(pin_t pin);
void toggleState();
void setPolarity(pin_t pin, polarity_t newPolarity);
void setPolarity(polarity_t newPolarity);
void reset();
byte getComResult();
private:
byte _comBuffer;
byte getReg(reg_ptr_t regPtr);
byte getPin(pin_t pin, reg_ptr_t regPtr);
void setReg(reg_ptr_t ptr, byte newSetting);
void setPin(pin_t pin, reg_ptr_t regPtr, byte newSetting);
void initCall(reg_ptr_t regPtr);
void endCall();
};