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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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Preamble
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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The hypothetical commands `show w' and `show c' should show the appropriate
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For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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/*
* See header file for details
*
* This program is free software: you can redistribute it and/or modify\n
* it under the terms of the GNU General Public License as published by\n
* the Free Software Foundation, either version 3 of the License, or\n
* (at your option) any later version.\n
*
* This program is distributed in the hope that it will be useful,\n
* but WITHOUT ANY WARRANTY; without even the implied warranty of\n
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n
* GNU General Public License for more details.\n
*
* You should have received a copy of the GNU General Public License\n
* along with this program. If not, see <http://www.gnu.org/licenses/>.\n
*/
/* Dependencies */
#include <Wire.h>
#include "PCF8574.h"
#ifdef PCF8574_INTERRUPT_SUPPORT
#include "PCint.h"
#endif
PCF8574::PCF8574() :
_PORT(0), _PIN(0), _DDR(0), _address(0)
#ifdef PCF8574_INTERRUPT_SUPPORT
, _oldPIN(0), _isrIgnore(0), _pcintPin(0), _intMode(), _intCallback()
#endif
{
}
void PCF8574::begin(uint8_t address) {
/* Store the I2C address and init the Wire library */
_address = address;
Wire.begin();
readGPIO();
}
void PCF8574::pinMode(uint8_t pin, uint8_t mode) {
/* Switch according mode */
switch (mode) {
case INPUT:
_DDR &= ~(1 << pin);
_PORT &= ~(1 << pin);
break;
case INPUT_PULLUP:
_DDR &= ~(1 << pin);
_PORT |= (1 << pin);
break;
case OUTPUT:
_DDR |= (1 << pin);
_PORT &= ~(1 << pin);
break;
default:
break;
}
/* Update GPIO values */
updateGPIO();
}
void PCF8574::digitalWrite(uint8_t pin, uint8_t value) {
/* Set PORT bit value */
if (value)
_PORT |= (1 << pin);
else
_PORT &= ~(1 << pin);
/* Update GPIO values */
updateGPIO();
}
uint8_t PCF8574::digitalRead(uint8_t pin) {
/* Read GPIO */
readGPIO();
#ifdef PCF8574_INTERRUPT_SUPPORT
/* Check for interrupt (manual detection) */
//checkForInterrupt();
#endif
/* Read and return the pin state */
return (_PIN & (1 << pin)) ? HIGH : LOW;
}
void PCF8574::write(uint8_t value) {
/* Store pins values and apply */
_PORT = value;
/* Update GPIO values */
updateGPIO();
}
uint8_t PCF8574::read() {
/* Read GPIO */
readGPIO();
#ifdef PCF8574_INTERRUPT_SUPPORT
/* Check for interrupt (manual detection) */
//checkForInterrupt();
#endif
/* Return current pins values */
return _PIN;
}
void PCF8574::pullUp(uint8_t pin) {
/* Same as pinMode(INPUT_PULLUP) */
pinMode(pin, INPUT_PULLUP); // /!\ pinMode form THE LIBRARY
}
void PCF8574::pullDown(uint8_t pin) {
/* Same as pinMode(INPUT) */
pinMode(pin, INPUT); // /!\ pinMode form THE LIBRARY
}
void PCF8574::clear() {
/* User friendly wrapper for write() */
write(0x00);
}
void PCF8574::set() {
/* User friendly wrapper for write() */
write(0xFF);
}
void PCF8574::toggle(uint8_t pin) {
/* Toggle pin state */
_PORT ^= (1 << pin);
/* Update GPIO values */
updateGPIO();
}
void PCF8574::blink(uint8_t pin, uint16_t count, uint32_t duration) {
/* Compute steps duration */
duration /= count * 2;
/* Loop n times */
while (count--) {
/* Toggle pin 2 times */
toggle(pin);
delay(duration);
toggle(pin);
delay(duration);
}
}
#ifdef PCF8574_INTERRUPT_SUPPORT
void PCF8574::enableInterrupt(uint8_t pin, void (*selfCheckFunction)(void)) {
/* Store interrupt pin number */
_pcintPin = pin;
/* Setup interrupt pin */
#if ARDUINO >= 100
::pinMode(pin, INPUT_PULLUP); // /!\ pinMode form THE ARDUINO CORE
#else
::pinMode(pin, INPUT); // /!\ pinMode form THE ARDUINO CORE
::digitalWrite(pin, HIGH); // /!\ digitalWrite form THE ARDUINO CORE
#endif
/* Attach interrupt handler */
PCattachInterrupt(pin, selfCheckFunction, FALLING);
}
void PCF8574::disableInterrupt() {
/* Detach interrupt handler */
PCdetachInterrupt(_pcintPin);
}
void PCF8574::checkForInterrupt() {
/* Avoid nested interrupt triggered by I2C read/write */
if(_isrIgnore)
return;
else
_isrIgnore = 1;
/* Re-enable interrupts to allow Wire library to work */
sei();
/* Read current pins values */
readGPIO();
/* Check all pins */
for (uint8_t i = 0; i < 8; ++i) {
/* Check for interrupt handler */
if (!_intCallback[i])
continue;
/* Check for interrupt event */
switch (_intMode[i]) {
case CHANGE:
if ((1 << i) & (_PIN ^ _oldPIN))
_intCallback[i]();
break;
case LOW:
if (!(_PIN & (1 << i)))
_intCallback[i]();
break;
case FALLING:
if ((_oldPIN & (1 << i)) && !(_PIN & (1 << i)))
_intCallback[i]();
break;
case RISING:
if (!(_oldPIN & (1 << i)) && (_PIN & (1 << i)))
_intCallback[i]();
break;
}
}
/* Turn off ISR ignore flag */
_isrIgnore = 0;
}
void PCF8574::attachInterrupt(uint8_t pin, void (*userFunc)(void),
uint8_t mode) {
/* Store interrupt mode and callback */
_intMode[pin] = mode;
_intCallback[pin] = userFunc;
}
void PCF8574::detachInterrupt(uint8_t pin) {
/* Void interrupt handler */
_intCallback[pin] = 0;
}
#endif
void PCF8574::readGPIO() {
#ifdef PCF8574_INTERRUPT_SUPPORT
/* Store old _PIN value */
_oldPIN = _PIN;
#endif
/* Start request, wait for data and receive GPIO values as byte */
Wire.requestFrom(_address, (uint8_t) 0x01);
while (Wire.available() < 1)
;
_PIN = I2CREAD();
}
void PCF8574::updateGPIO() {
/* Read current GPIO states */
//readGPIO(); // Experimental
/* Compute new GPIO states */
//uint8_t value = ((_PIN & ~_DDR) & ~(~_DDR & _PORT)) | _PORT; // Experimental
uint8_t value = (_PIN & ~_DDR) | _PORT;
/* Start communication and send GPIO values as byte */
Wire.beginTransmission(_address);
I2CWRITE(value);
Wire.endTransmission();
}

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/**
* @brief PCF8574 arduino library
* @author SkyWodd <skywodd@gmail.com>
* @version 2.0
* @link http://skyduino.wordpress.com/
*
* @section intro_sec Introduction
* This class is designed to allow user to use PCF8574 gpio expander like any standard arduino pins.\n
* This class provided standards arduino functions like pinMode, digitalWrite, digitalRead, ...\n
* This new version is fully optimized and documented.\n
* \n
* Please report bug to <skywodd at gmail.com>
*
* @section license_sec License
* This program is free software: you can redistribute it and/or modify\n
* it under the terms of the GNU General Public License as published by\n
* the Free Software Foundation, either version 3 of the License, or\n
* (at your option) any later version.\n
* \n
* This program is distributed in the hope that it will be useful,\n
* but WITHOUT ANY WARRANTY; without even the implied warranty of\n
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n
* GNU General Public License for more details.\n
* \n
* You should have received a copy of the GNU General Public License\n
* along with this program. If not, see <http://www.gnu.org/licenses/>.\n
*
* @section other_sec Others notes and compatibility warning
* Compatible with arduino 1.0.x and >=0023\n
* Retro-compatible with the previous library version
*/
#ifndef PCF8574_H
#define PCF8574_H
/** Comment this define to disable interrupt support */
#define PCF8574_INTERRUPT_SUPPORT
/* Retro-compatibility with arduino 0023 and previous version */
#if ARDUINO >= 100
#include "Arduino.h"
#define I2CWRITE(x) Wire.write(x)
#define I2CREAD() Wire.read()
#else
#include "WProgram.h"
#define I2CWRITE(x) Wire.send(x)
#define I2CREAD() Wire.receive()
#define INPUT_PULLUP 2
#endif
/**
* @brief PCF8574 Arduino class
*/
class PCF8574 {
public:
/**
* Create a new PCF8574 instance
*/
PCF8574();
/**
* Start the I2C controller and store the PCF8574 chip address
*/
void begin(uint8_t address = 0x21);
/**
* Set the direction of a pin (OUTPUT, INPUT or INPUT_PULLUP)
*
* @param pin The pin to set
* @param mode The new mode of the pin
* @remarks INPUT_PULLUP does physicaly the same thing as INPUT (no software pull-up resistors available) but is REQUIRED if you use external pull-up resistor
*/
void pinMode(uint8_t pin, uint8_t mode);
/**
* Set the state of a pin (HIGH or LOW)
*
* @param pin The pin to set
* @param value The new state of the pin
* @remarks Software pull-up resistors are not available on the PCF8574
*/
void digitalWrite(uint8_t pin, uint8_t value);
/**
* Read the state of a pin
*
* @param pin The pin to read back
* @return
*/
uint8_t digitalRead(uint8_t pin);
/**
* Set the state of all pins in one go
*
* @param value The new value of all pins (1 bit = 1 pin, '1' = HIGH, '0' = LOW)
*/
void write(uint8_t value);
/**
* Read the state of all pins in one go
*
* @return The current value of all pins (1 bit = 1 pin, '1' = HIGH, '0' = LOW)
*/
uint8_t read();
/**
* Exactly like write(0x00), set all pins to LOW
*/
void clear();
/**
* Exactly like write(0xFF), set all pins to HIGH
*/
void set();
/**
* Toggle the state of a pin
*/
void toggle(uint8_t pin);
/**
* Mark a pin as "pulled up"
*
* @warning DO NOTHING - FOR RETRO COMPATIBILITY PURPOSE ONLY
* @deprecated
* @param pin Pin the mark as "pulled up"
*/
void pullUp(uint8_t pin);
/**
* Mark a pin as "pulled down"
*
* @warning DO NOTHING - FOR RETRO COMPATIBILITY PURPOSE ONLY
* @deprecated
* @param pin Pin the mark as "pulled down"
*/
void pullDown(uint8_t pin);
/**
* Make a pin blink N times for T duration
*
* @warning Blocking function, not recommended for new code
* @deprecated
* @param pin The pin to blink
* @param count The number of ON/OFF couples to execute
* @param duration The duration of the whole blink action in milliseconds
*/
void blink(uint8_t pin, uint16_t count, uint32_t duration);
#ifdef PCF8574_INTERRUPT_SUPPORT
/**
* Enable interrupts support and setup interrupts handler
*
* @remarks Any pin can be used as "INT" pin, internally the library use PCINT to work.
* @warning The check wrapping routine must be provided by user and define in the global scope space.
* @param pin The pin OF YOUR ARDUINO (not the PCF8574) to use as "INT" pin for interrupts detection
* @param selfCheckFunction The wrapping routine used to process interrupts events.
* @remarks For best performances you should avoid this "user friendly" fonction and use the standard attachInterrupt() fonction ;)
* @remarks If multiple PCF8574 are wired on the same "INT" pin this function should be called only one time
*/
void enableInterrupt(uint8_t pin, void (*selfCheckFunction)(void));
/**
* Disable interrupts support
*/
void disableInterrupt();
/**
* Check for interrupt and process routine
*
* @remarks Call this routine from your wrapping routine to detect and process interrupts (if any) of this PCF8574 instance.
*/
void checkForInterrupt();
/**
* Attach a function to an interrupt event of a pin of the PCF8574
*
* @param pin The pin to attach the interrupt event on
* @param userFunc The callback function to call when the interrupt event is triggered
* @param mode The interrupt mode to check for, only interrupts events coming from the specified pin and with the specified mode will call the callback function.
* @remarks 1 PCF8574 pin = 1 interrupt, multiple interrupts on the same pin is not supported
*/
void attachInterrupt(uint8_t pin, void (*userFunc)(void), uint8_t mode);
/**
* Detach any interrupt attached to the specified pin
*
* @param pin The pin to detach any interrupt from
*/
void detachInterrupt(uint8_t pin);
#endif
protected:
/** Output pins values */
volatile uint8_t _PORT;
/** Current input pins values */
volatile uint8_t _PIN;
/** Pins modes values (OUTPUT or INPUT) */
volatile uint8_t _DDR;
/** PCF8574 I2C address */
uint8_t _address;
#ifdef PCF8574_INTERRUPT_SUPPORT
/** Old value of _PIN variable */
volatile uint8_t _oldPIN;
/** ISR ignore flag */
volatile uint8_t _isrIgnore;
/** PCINT pin used for "INT" pin handling */
uint8_t _pcintPin;
/** Interrupts modes of pins ( LOW, CHANGE, FALLING, RISING) */
uint8_t _intMode[8];
/** Interrupts callback functions */
void (*_intCallback[8])(void);
#endif
/**
* Read GPIO states and store them in _PIN variable
*
* @remarks Before reading current GPIO states, current _PIN variable value is moved to _oldPIN variable
*/
void readGPIO();
/**
* Write value of _PORT variable to the GPIO
*
* @remarks Only pin marked as OUTPUT are set, for INPUT pins their value are unchanged
* @warning To work properly (and avoid any states conflicts) readGPIO() MUST be called before call this function !
*/
void updateGPIO();
};
#endif

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arduino-cli/libraries/PCF8574/PCint.h Normal file
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#include "pins_arduino.h"
volatile uint8_t *port_to_pcmask[] = { &PCMSK0, &PCMSK1, &PCMSK2 };
static int PCintMode[24];
typedef void (*voidFuncPtr)(void);
volatile static voidFuncPtr PCintFunc[24] = { NULL };
volatile static uint8_t PCintLast[3];
/*
* attach an interrupt to a specific pin using pin change interrupts.
*/
void PCattachInterrupt(uint8_t pin, void (*userFunc)(void), int mode) {
uint8_t bit = digitalPinToBitMask(pin);
uint8_t port = digitalPinToPort(pin);
uint8_t slot;
volatile uint8_t *pcmask;
// map pin to PCIR register
if (port == NOT_A_PORT) {
return;
} else {
port -= 2;
pcmask = port_to_pcmask[port];
}
// -- Fix by Baziki. In the original sources it was a little bug, which cause analog ports to work incorrectly.
if (port == 1) {
slot = port * 8 + (pin - 14);
} else {
slot = port * 8 + (pin % 8);
}
// --Fix end
PCintMode[slot] = mode;
PCintFunc[slot] = userFunc;
// set the mask
*pcmask |= bit;
// enable the interrupt
PCICR |= 0x01 << port;
// Fix init by SkyWodd
PCintLast[0] = *portInputRegister(2);
PCintLast[1] = *portInputRegister(3);
PCintLast[2] = *portInputRegister(4);
}
void PCdetachInterrupt(uint8_t pin) {
uint8_t bit = digitalPinToBitMask(pin);
uint8_t port = digitalPinToPort(pin);
volatile uint8_t *pcmask;
// map pin to PCIR register
if (port == NOT_A_PORT) {
return;
} else {
port -= 2;
pcmask = port_to_pcmask[port];
}
// disable the mask.
*pcmask &= ~bit;
// if that's the last one, disable the interrupt.
if (*pcmask == 0) {
PCICR &= ~(0x01 << port);
}
}
// common code for isr handler. "port" is the PCINT number.
// there isn't really a good way to back-map ports and masks to pins.
static void PCint(uint8_t port) {
uint8_t bit;
uint8_t curr;
uint8_t mask;
uint8_t pin;
// get the pin states for the indicated port.
curr = *portInputRegister(port + 2);
mask = curr ^ PCintLast[port];
PCintLast[port] = curr;
// mask is pins that have changed. screen out non pcint pins.
if ((mask &= *port_to_pcmask[port]) == 0) {
return;
}
// mask is pcint pins that have changed.
for (uint8_t i = 0; i < 8; i++) {
bit = 0x01 << i;
if (bit & mask) {
pin = port * 8 + i;
// Trigger interrupt if mode is CHANGE, or if mode is RISING and
// the bit is currently high, or if mode is FALLING and bit is low.
if ((PCintMode[pin] == CHANGE
|| ((PCintMode[pin] == RISING) && (curr & bit))
|| ((PCintMode[pin] == FALLING) && !(curr & bit)))
&& (PCintFunc[pin] != NULL)) {
PCintFunc[pin]();
}
}
}
}
SIGNAL(PCINT0_vect) {
PCint(0);
}
SIGNAL(PCINT1_vect) {
PCint(1);
}
SIGNAL(PCINT2_vect) {
PCint(2);
}

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arduino-cli/libraries/PCF8574/examples/ButtonBlink/ButtonBlink.ino Normal file
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/**
* This demo code demonstrate all functionnalities of the PCF8574 library.
*
* PCF8574 pins map :
* 0: led
* 1: led
* 2: led
* 3: button + pull-up resistor
*/
/* Dependencies */
#include <Wire.h> // Required for I2C communication
#include "PCF8574.h" // Required for PCF8574
/** PCF8574 instance */
PCF8574 expander;
/** setup() */
void setup() {
/* Setup serial for debug */
Serial.begin(115200);
/* Start I2C bus and PCF8574 instance */
expander.begin(0x20);
/* Setup some PCF8574 pins for demo */
expander.pinMode(0, OUTPUT);
expander.pinMode(1, OUTPUT);
expander.pinMode(2, OUTPUT);
expander.pinMode(3, INPUT_PULLUP);
/* Enable PCF8574 interrupts, use pin D8 as "INT" pin and ISRgateway() as callback function */
expander.enableInterrupt(8, ISRgateway);
/* Attach a software interrupt on pin 3 of the PCF8574 */
expander.attachInterrupt(3, ISRdemo, FALLING);
expander.digitalWrite(0, HIGH); // Turn off led 1
}
/** This function will be called each time the state of a pin of the PCF8574 change */
void ISRgateway() {
expander.checkForInterrupt();
}
/** This function will be called each time the button on pin 3 is pressed (LOW-to-HIGH transition) */
void ISRdemo() {
/* Blink hardware LED for debug */
digitalWrite(13, HIGH);
/* Toggle PCF8574 output 0 for demo */
expander.toggle();
/* Blink hardware LED for debug */
digitalWrite(13, LOW);
}
/** loop() */
void loop() {
/* Blink demo */
expander.blink(1, 5, 500); // Blink led 2
delay(1000);
expander.blink(2, 5, 500); // Blink led 3
delay(1000);
/* DigitalWrite demo */
expander.digitalWrite(1, HIGH); // Turn off led 2
delay(500);
expander.digitalWrite(2, HIGH); // Turn off led 3
delay(500);
expander.digitalWrite(1, LOW); // Turn on led 2
delay(500);
expander.digitalWrite(2, LOW); // Turn on led 3
delay(500);
/* Toggle demo */
expander.toggle(1); // Toggle led 2
expander.toggle(2); // Toggle led 3
delay(1000);
expander.toggle(1); // Toggle led 2
expander.toggle(2); // Toggle led 3
delay(1000);
/* Direct pins acces demo (does not with input setup) */
//expander.write(255); // All led off
//delay(1000);
//expander.write(0); // All led on
//delay(1000);
/* DigitalRead demo */
expander.detachInterrupt(3); // Temporaly disable button interrupt
delay(1000); // PRESS THE BUTTON NOW (if you want to press it) !
Serial.println(expander.digitalRead(3) ? "HIGH" : "LOW"); // Print button pin state
Serial.println(expander.read(), DEC); // Read the whole pins input register
expander.attachInterrupt(3, ISRdemo, FALLING); // Re-enable interrupt on button pin
/* Final demo (warning: will make button bug) */
//expander.set(); // All led off
//delay(1000);
//expander.clear(); // All led on
delay(5000);
}

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#######################################
# Syntax Coloring Map For PCF8574/PCF8575
#######################################
#######################################
# Datatypes (KEYWORD1)
#######################################
PCF8574 KEYWORD1
PCF8575 KEYWORD1
#######################################
# Methods and Functions (KEYWORD2)
#######################################
begin KEYWORD2
pinMode KEYWORD2
digitalWrite KEYWORD2
digitalRead KEYWORD2
write KEYWORD2
read KEYWORD2
clear KEYWORD2
set KEYWORD2
toggle KEYWORD2
blink KEYWORD2
attachInterrupt KEYWORD2
detachInterrupt KEYWORD2
disableInterrupt KEYWORD2
enableInterrupt KEYWORD2
checkForInterrupt KEYWORD2
pullUp KEYWORD2
pullDown KEYWORD2
#######################################
# Constants (LITERAL1)
#######################################
INPUT_PULLUP LITERAL1