PCF8574 how to add / use encoder with multiclick

[MAWMN]

Hello,
I have a Wemos-D1 device connected to a PCF8574 & XREEF Library and like to use encoder with multiclick like singlePress, DoublePress, LongPress, etc. I am using now P0, P1, P2 and the INT line to SDA, SCL & D3 of my Wemos device. Is there a simple way to achieve this functionality, I am using the latest version of the library I believe it was 2.3.6

thanks in advance..

[Renzo Mischianti]

Hi MAWMN,
not inside the library, but I think you can check the millis(), and if you already have a click in a specified interval, you can abort the previous action and activate the new one.
But pay attention, if you already clicked one and after that interval, no other action was activated, you must execute the click function.
Bye Renzo

[MAWMN]

Hello,
just finnished my demo project, see the code below, perhaps also nice to use as an example :

thanks and bye..

/*
 * PCF8574 GPIO Port Expander
 * https://www.mischianti.org/2020/03/13/pcf8574-i2c-digital-i-o-expander-rotary-encoder-part-2/
 *
 * Connection Overview
 * PCF8574 —- WeMos-D1
 * A0 —- GND
 * A1 —- GND
 * A2 —- GND
 * VSS —- GND
 * VDD —- 5V/3.3V
 * SDA —- D1(PullUp) // GEEL
 * SCL —- D2(PullUp) // GROEN
 * INT —- INT(PullUp) // WIT
 *
 * PCF8574 —- Rot.Encoder
 * P0 —- ENCODER PIN A
 * P1 —- ENCODER PIN B
 * P2 —- ENCODER BUTTON
 *
 */
#include "Arduino.h"
#include "PCF8574.h"

// * Wemos-D1 defines
#define sdaPin D1 // This is the default Pin for Wemos-D1
#define sclPin D2 // This is the default Pin for Wemos-D1
// #define sdaPin D5 // ! NOT the default Pin - NOT WORKING @ Wemos-D1 ???
// #define sclPin D6 // ! NOT the default Pin - NOT WORKING @ Wemos-D1 ???
#define INTERRUPTED_PIN D3 // Wemos-D1 pin (D3 = Interrupt pin for Encoder)

// * RotaryEncoder defines (Connected to PCF8574)
#define encoderPinA P0
#define encoderPinB P1
#define switchPin P2

// Pre formatted Header for Interrupt (See Initialisation of updateEncoder Interrupt Below),
// necessary here because of the Interrupt Initialisation in the next Line
void IRAM_ATTR updateEncoder(); // ! *** IRAM_ATTR because this is the ISR !!!

// Initialize PCF-library Interrupt
PCF8574 pcf8574(0x38, INTERRUPTED_PIN, updateEncoder); // for Default I2C Pins
// PCF8574 pcf8574(0x38, sdaPin, sclPin, INTERRUPTED_PIN, updateEncoder); // ! NOT the default Pins - NOT WORKING @ Wemos-D1 ???

// Initialize Rot.Encoder Global variables
volatile long encoderValue = 0;
uint8_t encoderButtonVal = HIGH;

bool changed = false;

/*****************************************/
/***** MULTICLICK_DEBUG_PRINT MACRO *****/
/*****************************************/
// ? Uncomment to enable printing out nice debug messages.
// ? #define MULTICLICK_DEBUG
#define MULTICLICK_DEBUG

// Define where debug output will be printed.
#define MULTICLICK_PRINTER Serial

// Setup DEBUG printing MACRO
#ifdef MULTICLICK_DEBUG
#define MULTICLICK_DEBUG_PRINT(...) { MULTICLICK_PRINTER.print(__VA_ARGS__); }
#define MULTICLICK_DEBUG_PRINTLN(...) { MULTICLICK_PRINTER.println(__VA_ARGS__); }
#else
#define MULTICLICK_DEBUG_PRINT(...) {}
#define MULTICLICK_DEBUG_PRINTLN(...) {}
#endif

//**********************************************************************/
//! *** Additions tbv MULTI-CLICK: One Button with Multiple Events !!! */
//**********************************************************************/
#define maxMulticlickGap 1000 // Time where in between the multiclick must remain
#define maxLongPress 2000 // Max time in ms. to wait berfore clearing the firstPressTS

bool btnPressed = false;
bool btnReleased = true;
int lastBtnState = 0;
uint32 firstPressTS = 0; // Timestamp of the first btnPress moment
int clicksCnt = -1; // Count the number of Clicks before the firstPressTS Reset occurs (-1 = OFF)
bool clickHandled = false;
//**********************************************************************/

//******************************************************************/
//! ***** !!! ISR Functie tbv Encoder ButtonTurn & ButtonPress !!! */
//******************************************************************/
uint8_t encoderPinALast = LOW;
uint8_t valPrecEncoderButton = LOW;

void updateEncoder() { // ! *** IRAM_ATTR NOT necessary here for ISR !!!
// Encoder management
	uint8_t n = pcf8574.digitalRead(encoderPinA);
	if ((encoderPinALast == LOW) && (n == HIGH)) {
		if (pcf8574.digitalRead(encoderPinB) == LOW) {
// * ClockWise
			encoderValue++; // ! if we need to change counting for CW & CCW, we need to do it here
			changed = true; // Changed the value of the encoder
		} else {
// * Counter ClockWise
			encoderValue--; // ! if we need to change counting for CW & CCW, we need to do it here
			changed = true; // Changed the value of the encoder
		}
	}
	encoderPinALast = n;

// Button management
	encoderButtonVal = pcf8574.digitalRead(switchPin);
	if (encoderButtonVal != valPrecEncoderButton) {
// Changed the value of button
		changed = true;
		valPrecEncoderButton = encoderButtonVal;
	}
}

//**********************************************************************/
//! *** Additions tbv MULTI-CLICK: One Button with Multiple Events !!! */
//**********************************************************************/
void checkButton(bool buttonVal) {
	if (buttonVal == 0) {
		btnPressed = true;
		btnReleased = false;
	} else {
		btnPressed = false;
		btnReleased = true;
	}

	if (btnPressed == true) {
		MULTICLICK_DEBUG_PRINTLN("btnPressed..");
		if (firstPressTS == 0) {
			firstPressTS = millis();
			MULTICLICK_DEBUG_PRINT("firstPressTS set to - ");
			MULTICLICK_DEBUG_PRINTLN(firstPressTS);
			clicksCnt = 0;
		}
	} else if (btnReleased == true) {
		MULTICLICK_DEBUG_PRINTLN("btnReleased..");
	}

	if (lastBtnState != buttonVal) {
// There is a change in State
		if (btnReleased == true) {
// Take action when the button is being Released
			if ((millis() - firstPressTS) < maxMulticlickGap) {
				clicksCnt += 1;
			}
		}
	}

	lastBtnState = buttonVal;
}

// MultiClick Events to trigger
void singleClickEvent() {
	MULTICLICK_DEBUG_PRINTLN("Perform singleClickEvent");
	clickHandled = true;
}

void doubleClickEvent() {
	MULTICLICK_DEBUG_PRINTLN("Perform doubleClickEvent");
	clickHandled = true;
}

void tripleClickEvent() {
	MULTICLICK_DEBUG_PRINTLN("Perform tripleClickEvent");
	clickHandled = true;
}

void longPressEvent() {
	MULTICLICK_DEBUG_PRINTLN("Perform longPressEvent");
	clickHandled = true;
}
//**********************************************************************/

//******************************************************/
//***** Application Setup.. *****/
//******************************************************/
void setup() {
	/**************************/
	/***** StartUp Serial *****/
	/**************************/
	Serial.begin(115200);
	Serial.println();
	Serial.flush();
	delay(1000);

	/*****************************************************/
	/***** I2C Setup, Encoder Setup *****/
	/*****************************************************/
// pcf8574.begin(); // ! ???? DO we NEED This, works also without defining for using the default I2C Pins ????
// Setup PCF8574 pins
	pcf8574.pinMode(encoderPinA, INPUT_PULLUP);
	pcf8574.pinMode(encoderPinB, INPUT_PULLUP);

// Setup Encoder Switch button
	pcf8574.pinMode(switchPin, INPUT_PULLUP);

// Set low latency with this method or uncomment LOW_LATENCY define in the library
// Needed for the Encoder
	pcf8574.setLatency(0);

// Start the PCF8574 library
	MULTICLICK_DEBUG_PRINT("Init pcf8574…");
	if (pcf8574.begin()) {
// Board/Chip is Acknowledging the I2C Commands
		MULTICLICK_DEBUG_PRINTLN("OK");
	} else {
// Board/Chip is NOT Acknowledging the I2C Commands
		MULTICLICK_DEBUG_PRINTLN("NOT OK");
	}
}

//******************************************************/
//***** Application MAIN Loop.. *****/
//******************************************************/
void loop() {
	if (changed) {
		MULTICLICK_DEBUG_PRINT("ENCODER -> ");
		MULTICLICK_DEBUG_PRINT(encoderValue);
		MULTICLICK_DEBUG_PRINT(" - BUTTON -> ");
		MULTICLICK_DEBUG_PRINT(encoderButtonVal ? "HIGH -> " : "LOW -> ");

// Get button event and act accordingly
		checkButton(encoderButtonVal);

		changed = false;
	}

// handling of the checkButton() function - firstPressTS is running..
	if (firstPressTS != 0) {
// Perform ClickEvents based on maxMulticlickGap
		if ((millis() - maxMulticlickGap) >= firstPressTS) {
			if (clicksCnt == 1)
				singleClickEvent();
			if (clicksCnt == 2)
				doubleClickEvent();
			if (clicksCnt == 3)
				tripleClickEvent();
			if (clicksCnt <= 3) {
				clicksCnt = 0;
			}
		}

		if ((millis() - maxLongPress) >= firstPressTS) {
// MULTICLICK_DEBUG_PRINT("numClicks : ");
// MULTICLICK_DEBUG_PRINTLN(clicksCnt);
			if (clicksCnt >= 4) {
// number of clicks out of range
				MULTICLICK_DEBUG_PRINTLN("numClicks Out of Range..");
			} else if ((clicksCnt == 0) && (clickHandled == false))
				longPressEvent();

// Clear firstPressTS to stopped..
			MULTICLICK_DEBUG_PRINT("firstPressTS cleared @ ");
			MULTICLICK_DEBUG_PRINTLN(millis());
			firstPressTS = 0;
			clicksCnt = 0;
			clickHandled = false;
		}
	}
}

• This reply was modified 10 months, 2 weeks ago by Renzo Mischianti. Reason: Format code

[Renzo Mischianti]

Thanks a lot. Your work is precious.
Bye Renzo

[Author]

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