ESP32 I2C pin setting failed need help please.

[dssman]

Hi everyone.
the ESP32 works well on 21/22 default I2C pins, but the config other pin as I2C pins as description, lets say:
I2C_0.begin(14 , 15 ); never work. why?
Thanks
Adam

Code: Select all

#include <Wire.h>
#include "Adafruit_MCP23017.h"

#define MCPAddress  0x20   // **** new add for ESP32CAM 
Adafruit_MCP23017 mcp; //default scan address 000=0x20 ,001=0x24

#define I2C_Freq 100000
#define SDA_0 14
#define SCL_0 15
TwoWire I2C_0 = TwoWire(0);

void setup() {
  Serial.begin(115200);

  Serial.print("File   : "), Serial.println(__FILE__);
  const char compile_date[] = __DATE__ " " __TIME__;
  Serial.print("Compile timestamp: ");
  Serial.println(compile_date);

  mcp.begin();      // use default address 0
  setup_gpio_mode();

  I2C_0.begin(SDA_0 , SCL_0 );
  Wire.setClock(100000); //frequencia
  
  i2c_scan(); // got the address and put it behind the serial to monitor  //ได้ address แล้วปิดไว้ ไว้หลัง serial เพื่อ monitor
}

int i = 0;
void loop() {

  Serial.println("Write 16 IO = 1");
  test_io(1);
  delay(1000);

  Serial.println("Write 16 IO = 0");
  test_io(0);
  delay(1000);

  i++;
  if (i == 6) sleep(); //sleep เพื่อเช็ค status ตอนรันเทสไม่ต้อง sleep
}

void i2c_scan() {
  byte error, address;
  int nDevices;
  Serial.println();
  Serial.println("Scanning...");
  nDevices = 0;
  for (address = 1; address < 127; address++ )  {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);
      Serial.println("  !");
      nDevices++;
    } else if (error == 4) {
      Serial.print("Unknown error at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.println(address, HEX);
    }
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");
  delay(5000); // wait 5 seconds for next scan
}

void setup_gpio_mode() {
  mcp.pinMode(0, OUTPUT);
  mcp.pinMode(1, OUTPUT);
  mcp.pinMode(2, OUTPUT);
  mcp.pinMode(3, OUTPUT);
  mcp.pinMode(4, OUTPUT);
  mcp.pinMode(5, OUTPUT);
  mcp.pinMode(6, OUTPUT);
  mcp.pinMode(7, OUTPUT);
  mcp.pinMode(8, OUTPUT);
  mcp.pinMode(9, OUTPUT);
  mcp.pinMode(10, OUTPUT);
  mcp.pinMode(11, OUTPUT);
  mcp.pinMode(12, OUTPUT);
  mcp.pinMode(13, OUTPUT);
  mcp.pinMode(14, OUTPUT);
  mcp.pinMode(15, OUTPUT);
}

void test_io(int val) {
  mcp.digitalWrite(0, val);
  mcp.digitalWrite(1, val);
  mcp.digitalWrite(2, val);
  mcp.digitalWrite(3, val);
  mcp.digitalWrite(4, val);
  mcp.digitalWrite(5, val);
  mcp.digitalWrite(6, val);
  mcp.digitalWrite(7, val);
  mcp.digitalWrite(8, val);
  mcp.digitalWrite(9, val);
  mcp.digitalWrite(10, val);
  mcp.digitalWrite(11, val);
  mcp.digitalWrite(12, val);
  mcp.digitalWrite(13, val);
  mcp.digitalWrite(14, val);
  mcp.digitalWrite(15, val);
}

void sleep() {
  Serial.println("Sleeping... 30 sec");
  //  ESP.deepSleep(30 * 1000000, WAKE_RF_DEFAULT);//Sleep for 60 seconds
}

[chegewara]

Why are you mixing TwoWire and Wire? The code is inconsistent.
Wire and Wire1 are an instance of TwoWire, so no need to use TwoWire or instead of Wire use I2C_0.