Mirrored_Repos/PCF8574_library
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UPDATE 2.0 VERSION

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Renzo Mischianti 2020-03-06 22:22:26 +01:00
commit f8d02a8b34
5 changed files with 260 additions and 184 deletions
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185
PCF8574.cpp
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@ -169,14 +169,16 @@ void PCF8574::begin(){
if (writeMode>0 || readMode>0){ if (writeMode>0 || readMode>0){
DEBUG_PRINTLN("Set write mode"); DEBUG_PRINTLN("Set write mode");
_wire->beginTransmission(_address); _wire->beginTransmission(_address);
DEBUG_PRINT(" ");
DEBUG_PRINT("usedPin pin ");
byte usedPin = writeMode | readMode; DEBUG_PRINT("resetInitial pin ");
DEBUG_PRINTLN( ~usedPin, BIN); resetInitial = writeModeUp | readModePullUp;
DEBUG_PRINTLN( resetInitial, BIN);
_wire->write(~usedPin); _wire->write(resetInitial);
byteBuffered = resetInitial;
writeByteBuffered = writeModeUp;
DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor."); DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
_wire->endTransmission(); _wire->endTransmission();
@ -184,9 +186,12 @@ void PCF8574::begin(){
// If using interrupt set interrupt value to pin // If using interrupt set interrupt value to pin
if (_usingInterrupt){ 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)"); DEBUG_PRINTLN("Using interrupt pin (not all pin is interrupted)");
::pinMode(_interruptPin, INPUT_PULLUP); ::pinMode(_interruptPin, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(_interruptPin), (*_interruptFunction), FALLING ); attachInterrupt(digitalPinToInterrupt(_interruptPin), (*_interruptFunction), CHANGE );
} }
// inizialize last read // inizialize last read
@ -196,9 +201,10 @@ void PCF8574::begin(){
/** /**
* Set if fin is OUTPUT or INPUT * Set if fin is OUTPUT or INPUT
* @param pin: pin to set * @param pin: pin to set
* @param mode: mode, supported only INPUT or OUTPUT (to semplify) * @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){ void PCF8574::pinMode(uint8_t pin, uint8_t mode, uint8_t output_start){
DEBUG_PRINT("Set pin "); DEBUG_PRINT("Set pin ");
DEBUG_PRINT(pin); DEBUG_PRINT(pin);
DEBUG_PRINT(" as "); DEBUG_PRINT(" as ");
@ -206,26 +212,60 @@ void PCF8574::pinMode(uint8_t pin, uint8_t mode){
if (mode == OUTPUT){ if (mode == OUTPUT){
writeMode = writeMode | bit(pin); writeMode = writeMode | bit(pin);
if (output_start==HIGH) {
writeModeUp = writeModeUp | bit(pin);
}
readMode = readMode & ~bit(pin); readMode = readMode & ~bit(pin);
DEBUG_PRINT("writeMode: "); readModePullDown = readModePullDown & ~bit(pin);
readModePullUp = readModePullUp & ~bit(pin);
DEBUG_PRINT("W: ");
DEBUG_PRINT(writeMode, BIN); DEBUG_PRINT(writeMode, BIN);
DEBUG_PRINT("readMode: "); DEBUG_PRINT(" R ALL: ");
DEBUG_PRINTLN(readMode, BIN); DEBUG_PRINT(readMode, BIN);
DEBUG_PRINT(" R Down: ");
DEBUG_PRINT(readModePullDown, BIN);
DEBUG_PRINT("R Up: ");
DEBUG_PRINTLN(readModePullUp, BIN);
}else if (mode == INPUT){ }else if (mode == INPUT){
writeMode = writeMode & ~bit(pin); writeMode = writeMode & ~bit(pin);
readMode = readMode | bit(pin); readMode = readMode | bit(pin);
DEBUG_PRINT("writeMode: "); readModePullDown = readModePullDown | bit(pin);
readModePullUp = readModePullUp & ~bit(pin);
DEBUG_PRINT("W: ");
DEBUG_PRINT(writeMode, BIN); DEBUG_PRINT(writeMode, BIN);
DEBUG_PRINT("readMode: "); DEBUG_PRINT(" R ALL: ");
DEBUG_PRINTLN(readMode, BIN); 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{ else{
DEBUG_PRINTLN("Mode non supported by PCF8574") DEBUG_PRINTLN("Mode non supported by PCF8574")
} }
DEBUG_PRINT("Write mode: ");
DEBUG_PRINTLN(writeMode, BIN);
}; };
/** /**
@ -239,8 +279,9 @@ void PCF8574::readBuffer(bool force){
if(_wire->available()) // If bytes are available to be recieved if(_wire->available()) // If bytes are available to be recieved
{ {
byte iInput = _wire->read();// Read a byte byte iInput = _wire->read();// Read a byte
if ((iInput & readMode)>0){ if ((iInput & readModePullDown)>0 and (~iInput & readModePullUp)>0){
byteBuffered = byteBuffered | (byte)iInput; // if ((iInput & readMode)>0){
byteBuffered = (byteBuffered & ~readMode) | (byte)iInput;
} }
} }
} }
@ -261,13 +302,9 @@ void PCF8574::readBuffer(bool force){
DEBUG_PRINTLN("Data ready"); DEBUG_PRINTLN("Data ready");
byte iInput = _wire->read();// Read a byte byte iInput = _wire->read();// Read a byte
if ((iInput & readMode)>0){ if ((readModePullDown & iInput)>0 or (readModePullUp & ~iInput)>0){
DEBUG_PRINT("Input "); DEBUG_PRINT(" -------- CHANGE --------- ");
DEBUG_PRINTLN((byte)iInput, BIN); byteBuffered = (byteBuffered & ~readMode) | (byte)iInput;
byteBuffered = byteBuffered | (byte)iInput;
DEBUG_PRINT("byteBuffered ");
DEBUG_PRINTLN(byteBuffered, BIN);
} }
} }
@ -283,11 +320,11 @@ void PCF8574::readBuffer(bool force){
if ((bit(6) & readMode)>0) digitalInput.p6 = ((byteBuffered & bit(6))>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(7) & readMode)>0) digitalInput.p7 = ((byteBuffered & bit(7))>0)?HIGH:LOW;
if ((readMode & byteBuffered)>0){ //if ((byteBuffered & readModePullDown)>0 and (~byteBuffered & readModePullUp)>0){
byteBuffered = ~readMode & byteBuffered; byteBuffered = (resetInitial & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
DEBUG_PRINT("Buffer hight value readed set readed "); DEBUG_PRINT("Buffer hight value readed set readed ");
DEBUG_PRINTLN(byteBuffered, BIN); DEBUG_PRINTLN(byteBuffered, BIN);
} //}
DEBUG_PRINT("Return value "); DEBUG_PRINT("Return value ");
return digitalInput; return digitalInput;
}; };
@ -306,13 +343,10 @@ void PCF8574::readBuffer(bool force){
DEBUG_PRINTLN("Data ready"); DEBUG_PRINTLN("Data ready");
byte iInput = _wire->read();// Read a byte byte iInput = _wire->read();// Read a byte
if ((iInput & readMode)>0){ if ((readModePullDown & iInput)>0 or (readModePullUp & ~iInput)>0){
DEBUG_PRINT("Input "); DEBUG_PRINT(" -------- CHANGE --------- ");
DEBUG_PRINTLN((byte)iInput, BIN); byteBuffered = (byteBuffered & ~readMode) | (byte)iInput;
byteBuffered = byteBuffered | (byte)iInput;
DEBUG_PRINT("byteBuffered ");
DEBUG_PRINTLN(byteBuffered, BIN);
} }
} }
@ -321,11 +355,11 @@ void PCF8574::readBuffer(bool force){
byte byteRead = byteBuffered; byte byteRead = byteBuffered;
if ((readMode & byteBuffered)>0){ //if ((byteBuffered & readModePullDown)>0 and (~byteBuffered & readModePullUp)>0){
byteBuffered = ~readMode & byteBuffered; byteBuffered = (resetInitial & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
DEBUG_PRINT("Buffer hight value readed set readed "); DEBUG_PRINT("Buffer hight value readed set readed ");
DEBUG_PRINTLN(byteBuffered, BIN); DEBUG_PRINTLN(byteBuffered, BIN);
} //}
DEBUG_PRINT("Return value "); DEBUG_PRINT("Return value ");
return byteRead; return byteRead;
}; };
@ -338,45 +372,62 @@ void PCF8574::readBuffer(bool force){
* @return * @return
*/ */
uint8_t PCF8574::digitalRead(uint8_t pin){ uint8_t PCF8574::digitalRead(uint8_t pin){
uint8_t value = LOW; uint8_t value = (bit(pin) & readModePullUp)?HIGH:LOW;
DEBUG_PRINT("Read pin "); DEBUG_PRINT("Read pin ");
DEBUG_PRINTLN(pin); DEBUG_PRINT (pin);
// Check if pin already HIGH than read and prevent reread of i2c // 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){ if ((bit(pin) & byteBuffered)>0){
DEBUG_PRINTLN("Pin already up");
value = HIGH; value = HIGH;
}else{
value = LOW;
}
}else if ((/*(bit(pin) & byteBuffered)<=0 && */millis() > PCF8574::lastReadMillis+READ_ELAPSED_TIME) /*|| _usingInterrupt*/){ }else if ((/*(bit(pin) & byteBuffered)<=0 && */millis() > PCF8574::lastReadMillis+READ_ELAPSED_TIME) /*|| _usingInterrupt*/){
DEBUG_PRINTLN("Read from buffer"); DEBUG_PRINT(" ...Read from buffer... ");
_wire->requestFrom(_address,(uint8_t)1);// Begin transmission to PCF8574 with the buttons _wire->requestFrom(_address,(uint8_t)1);// Begin transmission to PCF8574 with the buttons
lastReadMillis = millis(); lastReadMillis = millis();
if(_wire->available()) // If bytes are available to be recieved if(_wire->available()) // If bytes are available to be recieved
{ {
DEBUG_PRINTLN("Data ready"); DEBUG_PRINTLN(" Data ready");
byte iInput = _wire->read();// Read a byte byte iInput = _wire->read();// Read a byte
if ((iInput & readMode)>0){
DEBUG_PRINT("Input "); DEBUG_PRINT("Input ");
DEBUG_PRINTLN((byte)iInput, BIN); DEBUG_PRINT((byte)iInput, BIN);
byteBuffered = byteBuffered | (byte)iInput;
DEBUG_PRINT("byteBuffered ");
DEBUG_PRINTLN(byteBuffered, BIN);
if ((readModePullDown & iInput)>0 or (readModePullUp & ~iInput)>0){
DEBUG_PRINT(" -------- CHANGE --------- ");
byteBuffered = (byteBuffered & ~readMode) | (byte)iInput;
if ((bit(pin) & byteBuffered)>0){ if ((bit(pin) & byteBuffered)>0){
value = HIGH; value = HIGH;
}else{
value = LOW;
}
// value = (bit(pin) & byteBuffered);
} }
} }
} }
} DEBUG_PRINT(" ..Buffer value ");
DEBUG_PRINT("Buffer value "); DEBUG_PRINT(byteBuffered, BIN);
DEBUG_PRINTLN(byteBuffered, BIN);
// If HIGH set to low to read buffer only one time // If HIGH set to low to read buffer only one time
if (value==HIGH){ if ((bit(pin) & readModePullDown) and value==HIGH){
byteBuffered = ~bit(pin) & byteBuffered; byteBuffered = bit(pin) ^ byteBuffered;
DEBUG_PRINT("Buffer hight value readed set readed "); DEBUG_PRINT(" ...Buffer hight value readed set readed ");
DEBUG_PRINTLN(byteBuffered, BIN); 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);
} }
DEBUG_PRINT("Return value "); DEBUG_PRINT(" ...Return value ");
DEBUG_PRINTLN(value); DEBUG_PRINTLN(value);
return value; return value;
}; };
@ -389,10 +440,17 @@ uint8_t PCF8574::digitalRead(uint8_t pin){
void PCF8574::digitalWrite(uint8_t pin, uint8_t value){ void PCF8574::digitalWrite(uint8_t pin, uint8_t value){
DEBUG_PRINTLN("Begin trasmission"); DEBUG_PRINTLN("Begin trasmission");
_wire->beginTransmission(_address); //Begin the transmission to PCF8574 _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){ if (value==HIGH){
writeByteBuffered = writeByteBuffered | bit(pin); writeByteBuffered = writeByteBuffered | bit(pin);
byteBuffered = writeByteBuffered | bit(pin);
}else{ }else{
writeByteBuffered = writeByteBuffered & ~bit(pin); writeByteBuffered = writeByteBuffered & ~bit(pin);
byteBuffered = writeByteBuffered & ~bit(pin);
} }
DEBUG_PRINT("Write data "); DEBUG_PRINT("Write data ");
DEBUG_PRINT(writeByteBuffered, BIN); DEBUG_PRINT(writeByteBuffered, BIN);
@ -401,10 +459,15 @@ void PCF8574::digitalWrite(uint8_t pin, uint8_t value){
DEBUG_PRINT(" bin value "); DEBUG_PRINT(" bin value ");
DEBUG_PRINT(bit(pin), BIN); DEBUG_PRINT(bit(pin), BIN);
DEBUG_PRINT(" value "); DEBUG_PRINT(" value ");
DEBUG_PRINTLN(value); DEBUG_PRINT(value);
writeByteBuffered = writeByteBuffered & writeMode; // writeByteBuffered = writeByteBuffered & (~writeMode & byteBuffered);
_wire->write(writeByteBuffered); byteBuffered = (writeByteBuffered & writeMode) | (resetInitial & readMode);
DEBUG_PRINT(" byteBuffered ");
DEBUG_PRINTLN(byteBuffered, BIN);
_wire->write(byteBuffered);
// byteBuffered = (writeByteBuffered & writeMode) & (byteBuffered & readMode);
DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor."); DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
_wire->endTransmission(); _wire->endTransmission();

15
PCF8574.h
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@ -45,6 +45,9 @@
// Uncomment for low memory usage this prevent use of complex DigitalInput structure and free 7byte of memory // Uncomment for low memory usage this prevent use of complex DigitalInput structure and free 7byte of memory
// #define PCF8574_LOW_MEMORY // #define PCF8574_LOW_MEMORY
// Uncomment for low memory usage this prevent use of complex DigitalInput structure and free 7byte of memory
// #define PCF8574_LOW_LATENCY
// Define where debug output will be printed. // Define where debug output will be printed.
#define DEBUG_PRINTER Serial #define DEBUG_PRINTER Serial
@ -57,7 +60,11 @@
#define DEBUG_PRINTLN(...) {} #define DEBUG_PRINTLN(...) {}
#endif #endif
#define READ_ELAPSED_TIME 10 #ifdef PCF8574_LOW_LATENCY
#define READ_ELAPSED_TIME 1
#else
#define READ_ELAPSED_TIME 10
#endif
//#define P0 B00000001 //#define P0 B00000001
//#define P1 B00000010 //#define P1 B00000010
@ -101,7 +108,7 @@ public:
#endif #endif
void begin(); void begin();
void pinMode(uint8_t pin, uint8_t mode); void pinMode(uint8_t pin, uint8_t mode, uint8_t output_start = HIGH);
void readBuffer(bool force = true); void readBuffer(bool force = true);
uint8_t digitalRead(uint8_t pin); uint8_t digitalRead(uint8_t pin);
@ -146,8 +153,12 @@ private:
void (*_interruptFunction)(){}; void (*_interruptFunction)(){};
byte writeMode = B00000000; byte writeMode = B00000000;
byte writeModeUp = B00000000;
byte readMode = B00000000; byte readMode = B00000000;
byte readModePullUp = B00000000;
byte readModePullDown = B00000000;
byte byteBuffered = B00000000; byte byteBuffered = B00000000;
byte resetInitial = B00000000;
unsigned long lastReadMillis = 0; unsigned long lastReadMillis = 0;
byte writeByteBuffered = B00000000; byte writeByteBuffered = B00000000;

2
README.md
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@ -2,6 +2,8 @@
### If you need more pins [here](https://www.mischianti.org/2019/07/22/pcf8575-i2c-16-bit-digital-i-o-expander/) you can find pcf8575 16bit version of the IC. ### If you need more pins [here](https://www.mischianti.org/2019/07/22/pcf8575-i2c-16-bit-digital-i-o-expander/) you can find pcf8575 16bit version of the IC.
### Version 2.0
Library to use i2c analog IC with arduino and esp8266. Can read and write digital value with only 2 wire (perfect for ESP-01). Library to use i2c analog IC with arduino and esp8266. Can read and write digital value with only 2 wire (perfect for ESP-01).
Tutorial: Tutorial:

2
library.properties
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@ -1,5 +1,5 @@
name=PCF8574 library name=PCF8574 library
version=1.2.0 version=2.0.0
author=Reef author=Reef
maintainer=Renzo Mischianti <renzo.mischianti@gmail.com> maintainer=Renzo Mischianti <renzo.mischianti@gmail.com>
sentence=Arduino/ESP8266 library for PCF8574 sentence=Arduino/ESP8266 library for PCF8574

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resources/PCB_PCF8574_03.fzz
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