I have:

• a Ultrasonic range sensor
• a M5 CoreInk. The sensor is connected on GPIO 32 and 33.

This is how I do it. Can you tell me what's wrong or an idea how to debug? thx

#define M5_I2C_ADDR_ULTRASONIC 0x57
Ink_Sprite InkPageSprite(&M5.M5Ink);

void setup() {
  M5.begin(); //Init CoreInk.  
  digitalWrite(LED_EXT_PIN,LOW);
  
  if( !M5.M5Ink.isInit()) //Init CoreInk screen.
  {
    Serial.printf("[-] M5Ink init failed");  
    while (1) delay(100);
  }

  Wire.begin(32,33);
  Serial.printf("[+] Wire begin done\n");

  M5.M5Ink.clear();   //Clear screen. 
  Serial.printf("[+] Clearing eInk screen\n"); 
  delay(1000);

  if( InkPageSprite.creatSprite(0,0,200,200,true) != 0 ){
    Serial.printf("[-] Ink Sprite create failed");
  }
 
}

void loop() {
  static float distance = 0;
  distance = readDistance();
  Serial.printf("Distance=%.1f cm\n",distance);
  if ((distance < 150) && (distance > 0)) {
      char buffer[30];
      sprintf(buffer,"%.1f cm",distance);
      InkPageSprite.drawString(15,150,buffer,&AsciiFont24x48);
      InkPageSprite.pushSprite();
  }

  // Sleep 
  delay(2000);
}