Reconfig SDA & SCL to NON Default pins on ESP32-CAM AI-Thinker board, Why is this NOT Working for PCF8574 Library

[MAWMN]

gives problems with the PCF8574 while the SSD display works fine with it:
Monitoring loop Started..
Init pcf8574...OK
but after constantly changing the content of the display (Seconds wise), all interrupts of the PCF8574 gives :
[ 55886][E][Wire.cpp:513] requestFrom(): i2cRead returned Error 263

Please tell me what am I doing wrong ??

#include <Arduino.h>
#include <stdint.h>
#include <esp_camera.h>

//* for I2C
#include <Wire.h> 
TwoWire I2C_PINS_NON_DEFAULT = Wire1;   // Try to reconfig the wire Lib to use NON Default Pins

#define SCL 15                         // IO15  GPIO15  HSPI_WSO  HS2_CMD     SD-Conn
#define SDA 14                         // IO14  GPIO14  HSPI_CLK  HS2_CLK     SD-Conn

#define SETBUSSPEED                    // We do want to set the BusSpeed
#undef SETBUSSPEED                     // We do NOT want to set the BusSpeed

#ifdef SETBUSSPEED
  #define BUSSPEED 100000U             // BusSpeed = 100.000 kHz
  // #define BUSSPEED 400000U             // BusSpeed = 400.000 kHz
#endif

//* SDD1306 Config
#include <U8x8lib.h>    // I2C (Maximum Speed SCL +/- 400 kHz)                                      // ! Text Only Library
U8X8_SSD1306_128X64_NONAME_SW_I2C u8x8(/* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE); // ! Text Only (from long list)

//* PCF8574 MultiClick
#include "PCF8574.h"
#define PCF_INTERRUPT 0				         // IO0   GPIO0   CAM_PIN_XCLK or CSI_MCLK (Interrupt pin for Encoder & Switch)

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

// Forward declaration for the Interrupt (See Initialisation of isr_updateEncoder ISR Below), 
//   necessary here because of the Interrupt Initialisation in the next Line
void IRAM_ATTR isr_updateEncoder();	

// Initialize PCF-library for used address, SDA & SCL, Interrupt function
PCF8574 pcf8574(0x38, SDA, SCL, PCF_INTERRUPT, isr_updateEncoder);
  

void IRAM_ATTR isr_updateEncoder() {
  //! DO NOT Read pcf8574.readEncoderValue(encoderPinA, encoderPinB, &encoderValue);
  //!         and pcf8574.digitalRead(switchPin); in the isr_updateEncoder() function here !!!
  //!  this will cause "Guru Meditation Error: Core  1 panic'ed (Interrupt wdt timeout on CPU1)"
  //!  Keep the interrupt function as short as possible and only set a flag here !!!
  //!  Next in the main loop() DO Read these values by the function getEncValues() and checkButton() !!!
  changed = true;
}


void ClrScr() {
  // ! *** See : https://github.com/olikraus/u8g2/wiki/u8x8reference
  u8x8.clear();
  delay(50);
  u8x8.clearDisplay();
  delay(50);
  u8x8.setFont(u8x8_font_chroma48medium8_r);      // Normal=1, Larger=2, largest=3, :1 pixel scale
  delay(50);                                      // See : https://github.com/olikraus/u8g2/wiki/fntlist8x8
  u8x8.print("");                                 // Draw text
  delay(50);
  u8x8.flush();
  delay(50);
}


void Display_Init() {    // ! *** Text Only
  u8x8.begin();                               // Start the Display Object, with NO PowerSaving
  delay(250);                                 // ! *** Extended delay 50 ==> 250 : See datasheet 18-12-2023 page 18 & 32
  u8x8.initDisplay();
  delay(50);         
  u8x8.setPowerSave(0);                       // Seems essentieel, for correct new start !!!
  delay(50);
  ClrScr();
}


void Display_Text(byte XPos, byte YPos, bool Invert, byte FieldSize, String MyText) {
  // u8x8 library only has LineMode (TEXT Only), for graphics use u8g2 library !!!
  // ! *** When using Graphics we are adressing X and y at pixel level !!!
  // ! *** When using Text Only we are adressing X and y at line level !!!
  // Set Font
  u8x8.setFont(u8x8_font_chroma48medium8_r);    // Small FontSize - 16 char/line
                                                // See : https://github.com/olikraus/u8g2/wiki/fntlist8x8

  // Set Normal / Inverse
  if (Invert == false) {
    u8x8.setInverseFont(0);                     // Draw 'normal' text
  } else {
    u8x8.setInverseFont(1);                     // Draw 'inverse' text
  }

  String NewStr = MyText; // Set for when FieldSize is set to 0 (NO Size Control) OR Correct !!!
  if (FieldSize != 0) {
    // Control the Length of the Text Field
    if (MyText.length() > FieldSize) {
      // MyText too long
      NewStr = "";
      for (size_t i = 1; i < FieldSize; i++) NewStr = NewStr + MyText[i];
    }

    if (MyText.length() < FieldSize) {
      // MyText too short
      NewStr = MyText;
      while (NewStr.length() < FieldSize) NewStr = NewStr + " ";
    }
  }
  u8x8.drawString(XPos, YPos, NewStr.c_str());
  u8x8.flush();
}


void setup() {
  //* Init Serial
  Serial.begin(115200);
  delay(3000);              //! We Need at least 3 seconds to start up the serial port for monitoring @ ESP32-Cam in PlatformIO !!!

  I2C_PINS_NON_DEFAULT.begin(SDA, SCL);

  //* Init OLED-Display
  Display_Init();           // Initialize the display and Start Showing the Information

  // Show texts @ the SSD Display
  mText = "Config.Finished.";
  Display_Text(0, 1, false, 16, mText);

  mText = "M.A.W.M. Nijland";
  Display_Text(0, 3, false, 16, mText);

  mText = "Apeldoorn - 2024";
  Display_Text(0, 5, false, 16, mText);

  Serial.println("\nMonitoring loop Started..");
  Serial.flush();

  //* Initialize ESP-CAM Interrupt Input
  pinMode(PCF_INTERRUPT, INPUT_PULLUP);

	//* Init PCF8574 pins	
  pcf8574.pinMode(encoderPinA, INPUT_PULLUP);   // Encoder A
  pcf8574.pinMode(encoderPinB, INPUT_PULLUP);   // Encoder B

	// Encoder pins
	pcf8574.encoder(encoderPinA, encoderPinB);

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

  delay(100);

	// Start the PCF8574 library
	Serial.print("Init pcf8574...");
	if (pcf8574.begin(0x38)) {
		// Board/Chip is Acknowledging the I2C Commands
		Serial.println("OK");
	} else {
		// Board/Chip is NOT Acknowledging the I2C Commands
		Serial.println("NOT OK");
	}
}

loop() {
  // etc. etc..
}

[xreef]

Hi,
Which device do you use?
Bye Renzo

[MAWMN]

Hi,
I am not sure about your question "Which device do you use" to what you are reffering to.
I am using ESP32-CAM AI thinker board, chip PCF8574 AN, Display SSD1306. Rotary encoder & Switch
tested the bare pcf chip with and without external pull-up resistors of 4.7kOhms to 3.3 Volt
The encoder contacts have all pull up 10kOhms to 3.3 Volts and 100nF capacitors to GND

My test board.pdf

thanks for looking into the issue, let me know if you need more..

MAWMN

[MAWMN]

Hello, I have written the code as an PlatformIO (VsCode) project for ESP32-CAM and ESP8266 Wemos-D1-Pro board.
Is it perhaps a good idea the upload the complete project & Schematics as a whole to investigate.
When I use the ESP8266 (default SCL & SDA), the problems do NOT happen and all is working OKE, only when using the ESP32-CAM board (NON default SCL & SDA) the ERROR happens and can be seen in the Serial monitor after having started the blinking of the LED only, the ERROR reported is : [457138][E][Wire.cpp:513] requestFrom(): i2cRead returned Error 263
for the ESP32-CAM board it is NOT possible to use the Standard default SCL & SDA pins because tey are not available at the outside connections of the board (They are configured to be used by the camera connector)

MAWMN