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Gordon! Thank you so much for your detailed advice. The path with using "save on send" unfortunately did not work, but setting up the onInit() function like you suggested worked like a charm! And thanks for including the resource on Saving, I had not seen that yet. Very helpful.

Hello,

When I have my Wifi plugged in with USB and I load the code through the IDE, everything works fine. The moment I save() it breaks and I get the I2C error above. Where should I begin to hunt down what's causing the issue?

Full code

Excerpt of code that is raising an error

function setup(){
  NEOPIXEL.write(B15, [0,0,0]);
  I2C2.setup({scl:B10,sda:B3});

  nfc = require("PN532").connect(I2C2);
  nfc.SAMConfig();

  setInterval(function() {
    nfc.findCards(function(card) {
      card = JSON.stringify(card);
      checkCard(card); 
      return;
    });
  }, 1000);

  spi = new SPI();
  spi.setup({mosi: B6 /* D1 */, sck:B5 /* D0 */});
  g = require("SSD1306").connectSPI(spi, A0 /* DC */, B7, start,{ height : 32 });
}

Full Error Message:

Uncaught InternalError: Timeout on I2C Write BUSY
 at line 1 col 172
...sh(0);this.i2c.writeTo(36,b);b=this.i­2c.readFrom(36,6);b[4]&...
                              ^
in function "cmd" called from line 1 col 18
this.cmd([74,1,0]);var d=this;setTimeout(function(){var c=d....
                 ^
in function "findCards" called from line 69 col 6
    });
     ^
in function called from system

I have also attached an image of the NFC chip I'm using. It is wired as follows:

• NFC -> Espruino
  
• GND -> -
  
• VCC -> 3.3v
  
• SDA -> B3
  
• SCL -> B10
  
  

I have looked at some of the Troubleshooting guides and they suggest:

• Remove all console.log/print statements. I think I have done so.
  
• Setting USB.setConsole() during onInit(). That changed nothing.
  
  

Any pointers would be greatly appreciated, I'm very new to all of this. Thanks in advance!