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/************************************************/ /***** I2C library for PCF8574 (XREEF) *****/ /***** I2C chip = PCA8574A – addr 0x38 *****/ /***** with A0=x, A1=x, A2=x (x= GND) *****/ /************************************************/ /***** ESP32-CAM I2C bus uses pins: *****/ /***** GPIO15 = SCL (ESP32_CAM) *****/ /***** GPIO14 = SDA (ESP32_CAM) *****/ /************************************************/Problem I2C @ ESP32-CAM (AI Thinker Board)
cpp#include <Wire.h> #define SCL 15 // IO15 GPIO15 HSPI_WSO HS2_CMD SD-Conn #define SDA 14 // IO14 GPIO14 HSPI_CLK HS2_CLK SD-Conn #include "PCF8574.h" // PCF8574 library @ 2.3.7 #define PCF_INTERRUPT 0 // IO0 GPIO0 CAM_PIN_XCLK or CSI_MCLK (Interrupt pin for Encoder & Switch) // Pre-formatted Header for the Interrupt (See initialization of updateEncoder Interrupt Below), // necessary because of the Interrupt initialization in the next line void IRAM_ATTR updateEncoder(); // ! *** IRAM_ATTR because this is the ISR !!! // Initialize PCF-library Interrupt PCF8574 pcf8574(0x38, PCF_INTERRUPT, updateEncoder); // for Default I2C PinsResult:
- Init pcf8574…begin(sda, scl) -> 21 22
- Using interrupt pin (not all pins support interrupts)
- STATUS –> 4
- NOT OK <== Wrong SDA and SCL port
After Change
#include <Wire.h> #define SCL 15 // IO15 GPIO15 HSPI_WSO HS2_CMD SD-Conn #define SDA 14 // IO14 GPIO14 HSPI_CLK HS2_CLK SD-Conn #include "PCF8574.h" // PCF8574 library @ 2.3.7 #define PCF_INTERRUPT 0 // IO0 GPIO0 CAM_PIN_XCLK or CSI_MCLK (Interrupt pin for Encoder & Switch) // Pre-formatted Header for the Interrupt (See initialization of updateEncoder Interrupt Below), // necessary because of the Interrupt initialization in the next line void IRAM_ATTR updateEncoder(); // ! *** IRAM_ATTR because this is the ISR !!! // Initialize PCF-library SDA & SCL PCF8574 pcf8574(0x38, SDA, SCL);
Question: How to also setup the PCF_INTERRUPT?Result:
- Init pcf8574…begin(sda, scl) -> 14 15 <== This is OK now
- But also need the Interrupt setup. How to do this?
- STATUS –> 4
- NOT OK <== Why is it still showing NOT OK?
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Hi,
for the interrupt you can use this constructor:PCF8574(uint8_t address, int sda, int scl, uint8_t interruptPin, void (*interruptFunction)());And the code become like so
#define INTERRUPTED_PIN D7 void ICACHE_RAM_ATTR interruptFunction(); // initialize library PCF8574 pcf8574(0x38, SDA, SCL, INTERRUPTED_PIN, interruptFunction);Bye Renzo
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Still Struggeling..
Trying to reconfig SDA & SCL to NON Default pins on ESP32-CAM AI-Thinker board, NOT Working for PCF8574 Library, does work at the same time for U8g2 Library ? 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 give : [ 55886][E][Wire.cpp:513] requestFrom(): i2cRead returned Error 263 #include <Arduino.h> #include <stdint.h> #include <esp_camera.h> //* for I2C #include <Wire.h> TwoWire I2C_PINS_NON_DEFAULT = Wire; // 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.. } -
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