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PCF8574.cpp
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/*
* PCF8574 GPIO Port Expand
* https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Renzo Mischianti www.mischianti.org All right reserved.
*
* 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 "PCF8574.h"
#include "Wire.h"
/**
* Constructor
* @param address: i2c address
*/
PCF8574::PCF8574(uint8_t address){
_wire = &Wire;
_address = address;
};
/**
* Construcor
* @param address: i2c address
* @param interruptPin: pin to set interrupt
* @param interruptFunction: function to call when interrupt raised
*/
PCF8574::PCF8574(uint8_t address, uint8_t interruptPin, void (*interruptFunction)() ){
_wire = &Wire;
_address = address;
_interruptPin = interruptPin;
_interruptFunction = interruptFunction;
_usingInterrupt = true;
};
#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO) && !defined(ARDUINO_ARCH_RENESAS)
/**
* Constructor
* @param address: i2c address
* @param sda: sda pin
* @param scl: scl pin
*/
PCF8574::PCF8574(uint8_t address, int sda, int scl){
_wire = &Wire;
_address = address;
_sda = sda;
_scl = scl;
};
/**
* Constructor
* @param address: i2c address
* @param sda: sda pin
* @param scl: scl pin
* @param interruptPin: pin to set interrupt
* @param interruptFunction: function to call when interrupt raised
*/
PCF8574::PCF8574(uint8_t address, int sda, int scl, uint8_t interruptPin, void (*interruptFunction)() ){
_wire = &Wire;
_address = address;
_sda = sda;
_scl = scl;
_interruptPin = interruptPin;
_interruptFunction = interruptFunction;
_usingInterrupt = true;
};
#endif
#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD)|| defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_RENESAS)
/**
* Constructor
* @param address: i2c address
*/
PCF8574::PCF8574(TwoWire *pWire, uint8_t address){
_wire = pWire;
_address = address;
};
/**
* Construcor
* @param address: i2c address
* @param interruptPin: pin to set interrupt
* @param interruptFunction: function to call when interrupt raised
*/
PCF8574::PCF8574(TwoWire *pWire, uint8_t address, uint8_t interruptPin, void (*interruptFunction)() ){
_wire = pWire;
_address = address;
_interruptPin = interruptPin;
_interruptFunction = interruptFunction;
_usingInterrupt = true;
};
#endif
#if defined(ESP32)
/**
* Constructor
* @param address: i2c address
* @param sda: sda pin
* @param scl: scl pin
*/
PCF8574::PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl){
_wire = pWire;
_address = address;
_sda = sda;
_scl = scl;
};
/**
* Constructor
* @param address: i2c address
* @param sda: sda pin
* @param scl: scl pin
* @param interruptPin: pin to set interrupt
* @param interruptFunction: function to call when interrupt raised
*/
PCF8574::PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl, uint8_t interruptPin, void (*interruptFunction)() ){
_wire = pWire;
_address = address;
_sda = sda;
_scl = scl;
_interruptPin = interruptPin;
_interruptFunction = interruptFunction;
_usingInterrupt = true;
};
#endif
bool encoderPins[8];
void PCF8574::attachInterrupt(){
// If using interrupt set interrupt value to pin
if (_usingInterrupt){
for (int i = 0; i < 8;i++){
if (encoderPins[i]) PCF8574::digitalRead(i);
}
// PCF8574::digitalReadAll();
// (*_interruptFunction)();
// DEBUG_PRINTLN("Using interrupt pin (not all pin is interrupted)");
// ::pinMode(_interruptPin, INPUT_PULLUP);
// attachInterrupt(digitalPinToInterrupt(_interruptPin), (*_interruptFunction), FALLING );
DEBUG_PRINTLN("Using interrupt pin (not all pin is interrupted)");
::pinMode(_interruptPin, INPUT_PULLUP);
::attachInterrupt(digitalPinToInterrupt(_interruptPin), (*_interruptFunction), FALLING );
}
}
void PCF8574::detachInterrupt(){
// If using interrupt set interrupt value to pin
if (_usingInterrupt){
::detachInterrupt(digitalPinToInterrupt(_interruptPin));
DEBUG_PRINTLN("Detach interrupt pin");
}
}
bool PCF8574::begin(uint8_t address){
_address = address;
return PCF8574::begin();
}
/**
* wake up i2c controller
*/
bool PCF8574::begin(){
this->transmissionStatus = 4;
#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO) && !defined(ARDUINO_ARCH_RENESAS)
DEBUG_PRINT(F("begin(sda, scl) -> "));DEBUG_PRINT(_sda);DEBUG_PRINT(F(" "));DEBUG_PRINTLN(_scl);
// _wire->begin(_sda, _scl);
#ifdef ARDUINO_ARCH_STM32
_wire->begin((uint32_t)_sda, (uint32_t)_scl);
#elif defined(ARDUINO_ARCH_RP2040)
_wire->setSCL(_scl);
_wire->setSDA(_sda);
_wire->begin();
#else
_wire->begin((int)_sda, (int)_scl);
#endif
#else
// Default pin for AVR some problem on software emulation
// #define SCL_PIN _scl
// #define SDA_PIN _sda
_wire->begin();
#endif
// Check if there are pins to set low
if (writeMode>0 || readMode>0){
DEBUG_PRINTLN("Set write mode");
_wire->beginTransmission(_address);
DEBUG_PRINT("resetInitial pin ");
#ifdef PCF8574_SOFT_INITIALIZATION
resetInitial = writeModeUp | readModePullUp;
#else
resetInitial = writeModeUp | readMode;
#endif
DEBUG_PRINTLN( resetInitial, BIN);
_wire->write(resetInitial);
initialBuffer = writeModeUp | readModePullUp;
byteBuffered = initialBuffer;
writeByteBuffered = writeModeUp;
DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
this->transmissionStatus = _wire->endTransmission();
}
// // If using interrupt set interrupt value to pin
// if (_usingInterrupt){
//// DEBUG_PRINTLN("Using interrupt pin (not all pin is interrupted)");
//// ::pinMode(_interruptPin, INPUT_PULLUP);
//// attachInterrupt(digitalPinToInterrupt(_interruptPin), (*_interruptFunction), FALLING );
// DEBUG_PRINTLN("Using interrupt pin (not all pin is interrupted)");
// ::pinMode(_interruptPin, INPUT_PULLUP);
// ::attachInterrupt(digitalPinToInterrupt(_interruptPin), (*_interruptFunction), FALLING );
// }
PCF8574::attachInterrupt();
// inizialize last read
lastReadMillis = millis();
return this->isLastTransmissionSuccess();
}
/**
* Set if fin is OUTPUT or INPUT
* @param pin: pin to set
* @param mode: mode, supported only INPUT or OUTPUT (to simplify)
* @param output_start: output_start, for OUTPUT we can set initial value
*/
void PCF8574::pinMode(uint8_t pin, uint8_t mode, uint8_t output_start){
DEBUG_PRINT("Set pin ");
DEBUG_PRINT(pin);
DEBUG_PRINT(" as ");
DEBUG_PRINTLN(mode);
if (mode == OUTPUT){
writeMode = writeMode | bit(pin);
if (output_start==HIGH) {
writeModeUp = writeModeUp | bit(pin);
}
readMode = readMode & ~bit(pin);
readModePullDown = readModePullDown & ~bit(pin);
readModePullUp = readModePullUp & ~bit(pin);
DEBUG_PRINT("W: ");
DEBUG_PRINT(writeMode, BIN);
DEBUG_PRINT(" R ALL: ");
DEBUG_PRINT(readMode, BIN);
DEBUG_PRINT(" R Down: ");
DEBUG_PRINT(readModePullDown, BIN);
DEBUG_PRINT("R Up: ");
DEBUG_PRINTLN(readModePullUp, BIN);
}else if (mode == INPUT){
writeMode = writeMode & ~bit(pin);
readMode = readMode | bit(pin);
readModePullDown = readModePullDown | bit(pin);
readModePullUp = readModePullUp & ~bit(pin);
DEBUG_PRINT("W: ");
DEBUG_PRINT(writeMode, BIN);
DEBUG_PRINT(" R ALL: ");
DEBUG_PRINT(readMode, BIN);
DEBUG_PRINT(" R Down: ");
DEBUG_PRINT(readModePullDown, BIN);
DEBUG_PRINT("R Up: ");
DEBUG_PRINTLN(readModePullUp, BIN);
}else if (mode == INPUT_PULLUP){
writeMode = writeMode & ~bit(pin);
readMode = readMode | bit(pin);
readModePullDown = readModePullDown & ~bit(pin);
readModePullUp = readModePullUp | bit(pin);
DEBUG_PRINT("W: ");
DEBUG_PRINT(writeMode, BIN);
DEBUG_PRINT(" R ALL: ");
DEBUG_PRINT(readMode, BIN);
DEBUG_PRINT(" R Down: ");
DEBUG_PRINT(readModePullDown, BIN);
DEBUG_PRINT("R Up: ");
DEBUG_PRINTLN(readModePullUp, BIN);
}
else{
DEBUG_PRINTLN("Mode non supported by PCF8574")
}
};
void PCF8574::encoder(uint8_t pinA, uint8_t pinB){
PCF8574::pinMode(pinA, INPUT_PULLUP);
PCF8574::pinMode(pinB, INPUT_PULLUP);
encoderPins[pinA] = true;
encoderPins[pinB] = true;
}
byte getBit(byte n, byte position)
{
return (n >> position) & 1;
}
//int8_t PCF8574::readEncoderValue(uint8_t pinA, uint8_t pinB){
// bool changed = false;
//
// byte offset = 0;
//
// byte na = PCF8574::digitalRead(pinA);
// byte nb = PCF8574::digitalRead(pinB);
//
// byte encoderPinALast = (encoderValues & bit(pinA));
// byte encoderPinBLast = (encoderValues & bit(pinB));
//
// if ((encoderPinALast!=na || encoderPinBLast!=nb) && (encoderPinALast == LOW) && (na == HIGH)) {
// if (nb == LOW) {
// offset = - 1;
// changed = true;
// } else {
// offset = + 1;
// changed = true;
// }
// }
//
// encoderValues = (encoderPinALast!=na)?encoderValues ^ bit(pinA):encoderValues;
// encoderValues = (encoderPinBLast!=nb)?encoderValues ^ bit(pinB):encoderValues;
//
// return offset;
//}
bool PCF8574::checkProgression(byte oldValA, byte oldValB, byte newValA, byte newValB, byte validProgression){
bool findOldVal = false;
int posFinded = 0;
for (int pos = 0; pos<8; pos = pos + 2){
if ((oldValB == ((validProgression & bit(pos+1))>0?HIGH:LOW)) && (oldValA == ((validProgression & bit(pos+0))>0?HIGH:LOW)) ){
findOldVal = true;
posFinded = pos;
}
}
if (!findOldVal) return false;
posFinded = posFinded + 2;
if (posFinded>8) posFinded = 0;
return ((newValB == ((validProgression & bit(posFinded+1))>0?HIGH:LOW)) && (newValA == ((validProgression & bit(posFinded+0))>0?HIGH:LOW)) );
}
#ifdef BASIC_ENCODER_ALGORITHM
bool PCF8574::readEncoderValue(uint8_t pinA, uint8_t pinB, volatile long *encoderValue, bool reverseRotation){
PCF8574::detachInterrupt();
bool changed = false;
byte na = PCF8574::digitalRead(pinA, true);
byte nb = PCF8574::digitalRead(pinB, true);
byte encoderPinALast = (this->encoderValues & bit(pinA))>0?HIGH:LOW;
byte encoderPinBLast = (this->encoderValues & bit(pinB))>0?HIGH:LOW;
DEBUG_PRINT(pinA);
DEBUG_PRINT(" TO --> ");
DEBUG_PRINT(encoderPinALast);
DEBUG_PRINT(encoderPinBLast);
DEBUG_PRINT(" - ");
DEBUG_PRINT(na);
DEBUG_PRINT(nb);
DEBUG_PRINTLN();
if ((encoderPinALast!=na || encoderPinBLast!=nb) && (encoderPinALast == LOW) && (na == HIGH)) {
// bool vCW = checkProgression(encoderPinALast, encoderPinBLast, na, nb, validCW);
// bool vCCW = checkProgression(encoderPinALast, encoderPinBLast, na, nb, validCCW);
if (nb == LOW) {
*encoderValue = *encoderValue + (!reverseRotation?+1:-1);
changed = true;
} else {
*encoderValue = *encoderValue + (!reverseRotation?-1:+1);
changed = true;
}
// if (nb == LOW && vCW) {
// // checkCW(encoderPinALast, encoderPinBLast, na, nb);
// *encoderValue = *encoderValue - 1;
// changed = true;
// } else if (vCCW) {
// *encoderValue = *encoderValue + 1;
// changed = true;
// }
}
this->encoderValues = (encoderPinALast!=na)?this->encoderValues ^ bit(pinA):this->encoderValues;
this->encoderValues = (encoderPinBLast!=nb)?this->encoderValues ^ bit(pinB):this->encoderValues;
PCF8574::attachInterrupt();
return changed;
}
int8_t PCF8574::readEncoderValue(uint8_t pinA, uint8_t pinB) {
volatile long encoderValue = 0;
PCF8574::readEncoderValue(pinA, pinB, &encoderValue);
return encoderValue;
}
#endif
#ifdef SEQUENCE_ENCODER_ALGORITHM
bool PCF8574::readEncoderValueSequence(uint8_t pinA, uint8_t pinB, volatile long *encoderValue, bool reverseRotation){
PCF8574::detachInterrupt();
bool changed = false;
delay(100);
byte na = PCF8574::digitalRead(pinA, true);
byte nb = PCF8574::digitalRead(pinB, true);
byte encoderPinALast = (this->encoderValues & bit(pinA))>0?HIGH:LOW;
byte encoderPinBLast = (this->encoderValues & bit(pinB))>0?HIGH:LOW;
DEBUG_PRINT(pinA);
DEBUG_PRINT(" TO --> ");
DEBUG_PRINT(encoderPinALast);
DEBUG_PRINT(encoderPinBLast);
DEBUG_PRINT(" - ");
DEBUG_PRINT(na);
DEBUG_PRINT(nb);
DEBUG_PRINT(" -- ");
int encoded = (na << 1) | nb; //converting the 2 pin value to single number
int lastEncoded = (encoderPinALast << 1) | encoderPinBLast;
int sum = (lastEncoded << 2) | encoded; //adding it to the previous encoded value
DEBUG_PRINT("sum - ");
DEBUG_PRINT(sum, BIN);
DEBUG_PRINT(" enc - ");
DEBUG_PRINT( *encoderValue);
if(
sum == 0b1101
|| sum == 0b0100
|| sum == 0b0010
|| sum == 0b1011
){
// encoderValue ++;
*encoderValue = *encoderValue + (!reverseRotation?+1:-1);
changed = true;
}
if(
sum == 0b1110
|| sum == 0b0111
|| sum == 0b0001
|| sum == 0b1000
) {
*encoderValue = *encoderValue + (!reverseRotation?-1:+1);
changed = true;
// encoderValue --;
}
DEBUG_PRINT(" enc next - ");
DEBUG_PRINTLN( *encoderValue);
this->encoderValues = (encoderPinALast!=na)?this->encoderValues ^ bit(pinA):this->encoderValues;
this->encoderValues = (encoderPinBLast!=nb)?this->encoderValues ^ bit(pinB):this->encoderValues;
PCF8574::attachInterrupt();
return changed;
}
int8_t PCF8574::readEncoderValueSequence(uint8_t pinA, uint8_t pinB) {
volatile long encoderValue = 0;
PCF8574::readEncoderValueSequence(pinA, pinB, &encoderValue);
return encoderValue;
}
#endif
#ifdef SEQUENCE_ENCODER_ALGORITHM_REDUCED
bool PCF8574::readEncoderValueSequenceReduced(uint8_t pinA, uint8_t pinB, volatile long *encoderValue, bool reverseRotation){
PCF8574::detachInterrupt();
bool changed = false;
delay(100);
byte na = PCF8574::digitalRead(pinA, true);
byte nb = PCF8574::digitalRead(pinB, true);
byte encoderPinALast = (this->encoderValues & bit(pinA))>0?HIGH:LOW;
byte encoderPinBLast = (this->encoderValues & bit(pinB))>0?HIGH:LOW;
DEBUG_PRINT(pinA);
DEBUG_PRINT(" TO --> ");
DEBUG_PRINT(encoderPinALast);
DEBUG_PRINT(encoderPinBLast);
DEBUG_PRINT(" - ");
DEBUG_PRINT(na);
DEBUG_PRINT(nb);
DEBUG_PRINT(" -- ");
int encoded = (na << 1) | nb; //converting the 2 pin value to single number
int lastEncoded = (encoderPinALast << 1) | encoderPinBLast;
int sum = (lastEncoded << 2) | encoded; //adding it to the previous encoded value
DEBUG_PRINT("sum - ");
DEBUG_PRINT(sum, BIN);
DEBUG_PRINT(" enc - ");
DEBUG_PRINT( *encoderValue);
if(
sum == 0b1101
// || sum == 0b0100
|| sum == 0b0010
// || sum == 0b1011
){
// encoderValue ++;
*encoderValue = *encoderValue + (!reverseRotation?+1:-1);
changed = true;
}
if(
sum == 0b1110
// || sum == 0b0111
|| sum == 0b0001
// || sum == 0b1000
) {
*encoderValue = *encoderValue + (!reverseRotation?-1:+1);
changed = true;
// encoderValue --;
}
DEBUG_PRINT(" enc next - ");
DEBUG_PRINTLN( *encoderValue);
this->encoderValues = (encoderPinALast!=na)?this->encoderValues ^ bit(pinA):this->encoderValues;
this->encoderValues = (encoderPinBLast!=nb)?this->encoderValues ^ bit(pinB):this->encoderValues;
PCF8574::attachInterrupt();
return changed;
}
int8_t PCF8574::readEncoderValueSequenceReduced(uint8_t pinA, uint8_t pinB) {
volatile long encoderValue = 0;
PCF8574::readEncoderValueSequenceReduced(pinA, pinB, &encoderValue);
return encoderValue;
}
#endif
#ifdef MISCHIANTI_ENCODER_ALGORITHM
bool PCF8574::readEncoderValueMischianti(uint8_t pinA, uint8_t pinB, volatile long *encoderValue, bool reverseRotation){
PCF8574::detachInterrupt();
bool changed = false;
byte na = PCF8574::digitalRead(pinA, true);
byte nb = PCF8574::digitalRead(pinB, true);
byte encoderPinALast = (this->encoderValues & bit(pinA))>0?HIGH:LOW;
byte encoderPinBLast = (this->encoderValues & bit(pinB))>0?HIGH:LOW;
if ((encoderPinALast!=na || encoderPinBLast!=nb) && ((encoderPinALast == LOW) || encoderPinALast==encoderPinBLast) && (na == HIGH)) {
DEBUG_PRINT("TO --> ");
DEBUG_PRINT(encoderPinALast);
DEBUG_PRINT(encoderPinBLast);
DEBUG_PRINT(" - ");
DEBUG_PRINT(na);
DEBUG_PRINT(nb);
DEBUG_PRINTLN();
if (nb == LOW && nb!=na) {
*encoderValue = *encoderValue + (!reverseRotation?+1:-1);
changed = true;
} else if (nb==na && encoderPinALast==encoderPinBLast) {
*encoderValue = *encoderValue + (!reverseRotation?-1:+1);
changed = true;
}
}
// encoderValues = encoderValues & (~(bit(pinA) | bit(pinB)));
// if (na == HIGH){
// encoderValues = encoderValues | bit(pinA);
// }
// if (nb == HIGH){
// encoderValues = encoderValues | bit(pinA);
// }
if (encoderPinALast!=na || encoderPinBLast!=nb){
this->encoderValues = (encoderPinALast!=na)?this->encoderValues ^ bit(pinA):this->encoderValues;
this->encoderValues = (encoderPinBLast!=nb)?this->encoderValues ^ bit(pinB):this->encoderValues;
}
PCF8574::attachInterrupt();
return changed;
}
int8_t PCF8574::readEncoderValueMischianti(uint8_t pinA, uint8_t pinB) {
volatile long encoderValue = 0;
PCF8574::readEncoderValueMischianti(pinA, pinB, &encoderValue);
return encoderValue;
}
#endif
//#ifdef MISCHIANTI_ENCODER_ALGORITHM_EVOLVED
// bool PCF8574::readEncoderValueEvolved(uint8_t pinA, uint8_t pinB, volatile long *encoderValue, bool reverseRotation){
// PCF8574::detachInterrupt();
// bool changed = false;
//
// byte na = PCF8574::digitalRead(pinA, true);
// byte nb = PCF8574::digitalRead(pinB, true);
//
// byte encoderPinALast = (this->encoderValues & bit(pinA))>0?HIGH:LOW;
// byte encoderPinBLast = (this->encoderValues & bit(pinB))>0?HIGH:LOW;
//
//// Serial.print(pinA);
//// Serial.print(" TO --> ");
//// Serial.print(encoderPinALast);
//// Serial.print(encoderPinBLast);
//// Serial.print(" - ");
//// Serial.print(na);
//// Serial.print(nb);
//
// if (
//
// ((encoderPinALast!=na || encoderPinBLast!=nb) && ((encoderPinALast == LOW) || encoderPinALast==encoderPinBLast) && (na == HIGH))
// || ((encoderPinALast!=na || encoderPinBLast!=nb) && ((encoderPinALast == HIGH) || encoderPinALast==encoderPinBLast) && (na == LOW))
// ){
// DEBUG_PRINT("TO --> ");
// DEBUG_PRINT(encoderPinALast);
// DEBUG_PRINT(encoderPinBLast);
// DEBUG_PRINT(" - ");
// DEBUG_PRINT(na);
// DEBUG_PRINT(nb);
// DEBUG_PRINTLN();
//
//// Serial.print (" <------ ");
//
// if (nb == LOW && nb!=na) {
// *encoderValue = *encoderValue + (!reverseRotation?+1:-1);
// changed = true;
// } else if (nb==na && encoderPinALast==encoderPinBLast) {
// *encoderValue = *encoderValue + (!reverseRotation?-1:+1);
// changed = true;
// }
// }
//// Serial.println();
//// encoderValues = encoderValues & (~(bit(pinA) | bit(pinB)));
//// if (na == HIGH){
//// encoderValues = encoderValues | bit(pinA);
//// }
//// if (nb == HIGH){
//// encoderValues = encoderValues | bit(pinA);
//// }
//
// if (encoderPinALast!=na || encoderPinBLast!=nb){
// this->encoderValues = (encoderPinALast!=na)?this->encoderValues ^ bit(pinA):this->encoderValues;
// this->encoderValues = (encoderPinBLast!=nb)?this->encoderValues ^ bit(pinB):this->encoderValues;
// }
//
// PCF8574::attachInterrupt();
// return changed;
// }
// int8_t PCF8574::readEncoderValueEvolved(uint8_t pinA, uint8_t pinB) {
// volatile long encoderValue = 0;
// PCF8574::readEncoderValueEvolved(pinA, pinB, &encoderValue);
// return encoderValue;
// }
//
//#endif
#ifdef POKI_ENCODER_ALGORITHM
bool PCF8574::readEncoderValuePoki(uint8_t pinA, uint8_t pinB, volatile long *encoderValue, bool reverseRotation){
PCF8574::detachInterrupt();
bool changed = false;
byte na = PCF8574::digitalRead(pinA, true);
byte nb = PCF8574::digitalRead(pinB, true);
byte encoderPinALast = (this->encoderValues & bit(pinA))>0?HIGH:LOW;
byte encoderPinBLast = (this->encoderValues & bit(pinB))>0?HIGH:LOW;
DEBUG_PRINT("TO --> ");
DEBUG_PRINT(encoderPinALast);
DEBUG_PRINT(encoderPinBLast);
DEBUG_PRINT(" - ");
DEBUG_PRINT(na);
DEBUG_PRINT(nb);
DEBUG_PRINTLN();
if ((encoderPinALast!=na || encoderPinBLast!=nb) && ((encoderPinALast == LOW) || encoderPinALast==encoderPinBLast) && (na == HIGH)) {
DEBUG_PRINT("TO --> ");
DEBUG_PRINT(encoderPinALast);
DEBUG_PRINT(encoderPinBLast);
DEBUG_PRINT(" - ");
DEBUG_PRINT(na);
DEBUG_PRINT(nb);
DEBUG_PRINTLN();
if (na && !nb) {
if (encoderPinBLast) {
*encoderValue = *encoderValue + (!reverseRotation?+1:-1);
} else {
*encoderValue = *encoderValue + (!reverseRotation?-1:+1);
}
changed = true;
}
}
this->encoderValues = (encoderPinALast!=na)?this->encoderValues ^ bit(pinA):encoderValues;
this->encoderValues = (encoderPinBLast!=nb)?this->encoderValues ^ bit(pinB):encoderValues;
PCF8574::attachInterrupt();
return changed;
}
int8_t PCF8574::readEncoderValuePoki(uint8_t pinA, uint8_t pinB) {
volatile long encoderValue = 0;
PCF8574::readEncoderValue(pinA, pinB, &encoderValue);
return encoderValue;
}
#endif
/**
* Read value from i2c and bufferize it
* @param force
*/
void PCF8574::readBuffer(bool force){
// if (millis() > PCF8574::lastReadMillis+latency || _usingInterrupt || force){
if (millis() - PCF8574::lastReadMillis > latency || _usingInterrupt || force){
_wire->requestFrom(_address,(uint8_t)1);// Begin transmission to PCF8574 with the buttons
lastReadMillis = millis();
if(_wire->available()) // If bytes are available to be recieved
{
byte iInput = _wire->read();// Read a byte
if ((iInput & readModePullDown)>0 and (~iInput & readModePullUp)>0){
// if ((iInput & readMode)>0){
byteBuffered = (byteBuffered & ~readMode) | (byte)iInput;
}
}
}
}
#ifndef PCF8574_LOW_MEMORY
/**
* Read value of all INPUT pin
* Debounce read more fast than 10millis, non managed for interrupt mode
* @return
*/
PCF8574::DigitalInput PCF8574::digitalReadAll(void){
DEBUG_PRINTLN("Read from buffer");
_wire->requestFrom(_address,(uint8_t)1);// Begin transmission to PCF8574 with the buttons
lastReadMillis = millis();
if(_wire->available()) // If bytes are available to be recieved
{
DEBUG_PRINTLN("Data ready");
byte iInput = _wire->read();// Read a byte
if ((readModePullDown & iInput)>0 or (readModePullUp & ~iInput)>0){
DEBUG_PRINT(" -------- CHANGE --------- ");
byteBuffered = (byteBuffered & ~readMode) | (byte)iInput;
}
}
DEBUG_PRINT("Buffer value ");
DEBUG_PRINTLN(byteBuffered, BIN);
if ((bit(0) & readMode)>0) digitalInput.p0 = ((byteBuffered & bit(0))>0)?HIGH:LOW;
if ((bit(1) & readMode)>0) digitalInput.p1 = ((byteBuffered & bit(1))>0)?HIGH:LOW;
if ((bit(2) & readMode)>0) digitalInput.p2 = ((byteBuffered & bit(2))>0)?HIGH:LOW;
if ((bit(3) & readMode)>0) digitalInput.p3 = ((byteBuffered & bit(3))>0)?HIGH:LOW;
if ((bit(4) & readMode)>0) digitalInput.p4 = ((byteBuffered & bit(4))>0)?HIGH:LOW;
if ((bit(5) & readMode)>0) digitalInput.p5 = ((byteBuffered & bit(5))>0)?HIGH:LOW;
if ((bit(6) & readMode)>0) digitalInput.p6 = ((byteBuffered & bit(6))>0)?HIGH:LOW;
if ((bit(7) & readMode)>0) digitalInput.p7 = ((byteBuffered & bit(7))>0)?HIGH:LOW;
if ((bit(0) & writeMode)>0) digitalInput.p0 = ((writeByteBuffered & bit(0))>0)?HIGH:LOW;
if ((bit(1) & writeMode)>0) digitalInput.p1 = ((writeByteBuffered & bit(1))>0)?HIGH:LOW;
if ((bit(2) & writeMode)>0) digitalInput.p2 = ((writeByteBuffered & bit(2))>0)?HIGH:LOW;
if ((bit(3) & writeMode)>0) digitalInput.p3 = ((writeByteBuffered & bit(3))>0)?HIGH:LOW;
if ((bit(4) & writeMode)>0) digitalInput.p4 = ((writeByteBuffered & bit(4))>0)?HIGH:LOW;
if ((bit(5) & writeMode)>0) digitalInput.p5 = ((writeByteBuffered & bit(5))>0)?HIGH:LOW;
if ((bit(6) & writeMode)>0) digitalInput.p6 = ((writeByteBuffered & bit(6))>0)?HIGH:LOW;
if ((bit(7) & writeMode)>0) digitalInput.p7 = ((writeByteBuffered & bit(7))>0)?HIGH:LOW;
//if ((byteBuffered & readModePullDown)>0 and (~byteBuffered & readModePullUp)>0){
// byteBuffered = (resetInitial & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
byteBuffered = (initialBuffer & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
DEBUG_PRINT("Buffer hight value readed set readed ");
DEBUG_PRINTLN(byteBuffered, BIN);
//}
DEBUG_PRINT("Return value ");
return digitalInput;
};
#else
/**
* Read value of all INPUT pin in byte format for low memory usage
* Debounce read more fast than 10millis, non managed for interrupt mode
* @return
*/
byte PCF8574::digitalReadAll(void){
DEBUG_PRINTLN("Read from buffer");
_wire->requestFrom(_address,(uint8_t)1);// Begin transmission to PCF8574 with the buttons
lastReadMillis = millis();
if(_wire->available()) // If bytes are available to be recieved
{
DEBUG_PRINTLN("Data ready");
byte iInput = _wire->read();// Read a byte
if ((readModePullDown & iInput)>0 or (readModePullUp & ~iInput)>0){
DEBUG_PRINT(" -------- CHANGE --------- ");
byteBuffered = (byteBuffered & ~readMode) | (byte)iInput;
}
}
DEBUG_PRINT("Buffer value ");
DEBUG_PRINTLN(byteBuffered, BIN);
byte byteRead = byteBuffered | writeByteBuffered;
//if ((byteBuffered & readModePullDown)>0 and (~byteBuffered & readModePullUp)>0){
// byteBuffered = (resetInitial & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
byteBuffered = (initialBuffer & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
DEBUG_PRINT("Buffer hight value readed set readed ");
DEBUG_PRINTLN(byteBuffered, BIN);
//}
DEBUG_PRINT("Return value ");
return byteRead;
};
#endif
/**
* Read value of specified pin
* Debounce read more fast than 10millis, non managed for interrupt mode
* @param pin
* @return
*/
uint8_t PCF8574::digitalRead(uint8_t pin, bool forceReadNow){
uint8_t value = (bit(pin) & readModePullUp)?HIGH:LOW;
DEBUG_PRINT("Read pin ");
DEBUG_PRINT (pin);
// Check if pin already HIGH than read and prevent reread of i2c
// DEBUG_PRINTLN("----------------------------------")
// DEBUG_PRINT("readModePullUp ");
// DEBUG_PRINTLN(readModePullUp, BIN);
// DEBUG_PRINT("readModePullDown ");
// DEBUG_PRINTLN(readModePullDown, BIN);
// DEBUG_PRINT("byteBuffered ");
// DEBUG_PRINTLN(byteBuffered, BIN);
if ((((bit(pin) & (readModePullDown & byteBuffered))>0) or (bit(pin) & (readModePullUp & ~byteBuffered))>0 )){
DEBUG_PRINTLN(" ...Pin already set");
if ((bit(pin) & byteBuffered)>0){
value = HIGH;
}else{
value = LOW;
}
// }else if (forceReadNow || (millis() > PCF8574::lastReadMillis+latency)){
}else if (forceReadNow || (millis() - PCF8574::lastReadMillis > latency)){
DEBUG_PRINT(" ...Read from buffer... ");
_wire->requestFrom(_address,(uint8_t)1);// Begin transmission to PCF8574 with the buttons
lastReadMillis = millis();
if(_wire->available()) // If bytes are available to be recieved
{
DEBUG_PRINTLN(" Data ready");
byte iInput = _wire->read();// Read a byte
DEBUG_PRINT("Input ");
DEBUG_PRINT((byte)iInput, BIN);
if ((readModePullDown & iInput)>0 or (readModePullUp & ~iInput)>0){
DEBUG_PRINT(" -------- CHANGE --------- ");
byteBuffered = (byteBuffered & ~readMode) | (byte)iInput;
if ((bit(pin) & byteBuffered)>0){
value = HIGH;
}else{
value = LOW;
}
// value = (bit(pin) & byteBuffered);
}
}
}
DEBUG_PRINT(" ..Buffer value ");
DEBUG_PRINT(byteBuffered, BIN);
// If HIGH set to low to read buffer only one time
if ((bit(pin) & readModePullDown) and value==HIGH){
byteBuffered = bit(pin) ^ byteBuffered;
DEBUG_PRINT(" ...Buffer hight value readed set readed ");
DEBUG_PRINT (byteBuffered, BIN);
}else if ((bit(pin) & readModePullUp) and value==LOW){
byteBuffered = bit(pin) ^ byteBuffered;
DEBUG_PRINT(" ...Buffer low value readed set readed ");
DEBUG_PRINT(byteBuffered, BIN);
}else if(bit(pin) & writeByteBuffered){
value = HIGH;
}
DEBUG_PRINT(" ...Return value ");
DEBUG_PRINTLN(value);
return value;
};
/**
* Write on pin
* @param pin
* @param value
*/
bool PCF8574::digitalWrite(uint8_t pin, uint8_t value){
DEBUG_PRINTLN("Begin trasmission");
_wire->beginTransmission(_address); //Begin the transmission to PCF8574
DEBUG_PRINT("Value ");
DEBUG_PRINT(value);
DEBUG_PRINT(" Write data pre ");
DEBUG_PRINT(writeByteBuffered, BIN);
if (value==HIGH){
writeByteBuffered = writeByteBuffered | bit(pin);
byteBuffered = writeByteBuffered | bit(pin);
}else{
writeByteBuffered = writeByteBuffered & ~bit(pin);
byteBuffered = writeByteBuffered & ~bit(pin);
}
DEBUG_PRINT("Write data ");
DEBUG_PRINT(writeByteBuffered, BIN);
DEBUG_PRINT(" for pin ");
DEBUG_PRINT(pin);
DEBUG_PRINT(" bin value ");
DEBUG_PRINT(bit(pin), BIN);
DEBUG_PRINT(" value ");
DEBUG_PRINT(value);
// writeByteBuffered = writeByteBuffered & (~writeMode & byteBuffered);
byteBuffered = (writeByteBuffered & writeMode) | (resetInitial & readMode);
// byteBuffered = (writeByteBuffered & writeMode) | (byteBuffered & readMode);
DEBUG_PRINT(" byteBuffered ");
DEBUG_PRINTLN(byteBuffered, BIN);
DEBUG_PRINT("Going to write data ");
DEBUG_PRINTLN(writeByteBuffered, BIN);
_wire->write(byteBuffered);
byteBuffered = (writeByteBuffered & writeMode) | (initialBuffer & readMode);
// byteBuffered = (writeByteBuffered & writeMode) & (byteBuffered & readMode);
DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
this->transmissionStatus = _wire->endTransmission();
return this->isLastTransmissionSuccess();
};
#ifndef PCF8574_LOW_MEMORY
/**
* Read value of all INPUT pin
* Debounce read more fast than 10millis, non managed for interrupt mode
* @return
*/
void PCF8574::setVal(uint8_t pin, uint8_t value){
if (value==HIGH){
writeByteBuffered = writeByteBuffered | bit(pin);
byteBuffered = writeByteBuffered | bit(pin);
}else{
writeByteBuffered = writeByteBuffered & ~bit(pin);
byteBuffered = writeByteBuffered & ~bit(pin);
}
}
bool PCF8574::digitalWriteAll(PCF8574::DigitalInput digitalInput){