NFC module (PN532) not working

[espruino-discuss3]

Posted at 2019-01-11 by markopraakli

Hello guys
I've set my module to use I2C and using following example:

I2C1.setup({scl:22, sda:21,});
var nfc = require("PN532").connect(I2C1);
print(nfc.getVersion());
nfc.SAMConfig(); // start listening
setInterval(function() {
 nfc.findCards(function(card) {
  print("Found card "+card);
  card = JSON.stringify(card);
  var leds = [LED1,LED2,LED3];
  if (card=="[147,239,211,128]") digitalWrite(leds,1);
  if (card=="[249,192,235,164]") digitalWrite(leds,2);
  if (card=="[4,99,129,114,72,52,128]") digitalWrite(leds,4);
 });
}, 1000);

And I got I2C errors:

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v01 (c) 2018 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
WARNING: Scan stop failed
WARNING: set rssi scan not implemeted yet
WARNING: jshI2CSetup: driver installed, sda: 21 sdl: 22 freq: 1000000,
ERROR: jshI2CWrite:, slave doesn't ACK the transfer.
ERROR: jshI2CRead:, Operation timeout because the bus is busy.
ERROR: jshI2CRead:, Operation timeout because the bus is busy.
{
  "chip": "PN51c",
  "firmware": "232.254",
  "support": 63 }
ERROR: jshI2CWrite:, Operation timeout because the bus is busy.
ERROR: jshI2CRead:, Operation timeout because the bus is busy.
ERROR: jshI2CRead:, Operation timeout because the bus is busy.

Any ideas why basic example does not work? Using ESP32 module.

[espruino-discuss3]

Posted at 2019-01-14 by markopraakli

Seems like v197 will work with PN532. But not in v198. Only change what I found is here:
espruino/Espruino@3739ee5

@gfwilliams can you figure out why PN532 does not work in newer versions?

---

Posted at 2019-01-14 by @gfwilliams

Can you try : I2C1.setup({scl:22, sda:21, bitrate:50000});?

And which board is this on? It looks suspiciously like an ESP8266/32?