pn532 not being detected.

[datboi2008]

I found a modified version of the example code, but whenever I try to run it it says that it can't detect the pn532.

import NFC_PN532 as nfc
from machine import Pin, SPI

SPI

spi_dev = SPI(0, baudrate=400000, sck=Pin(18), mosi=Pin(19), miso=Pin(16))
cs = Pin(17, Pin.OUT)
cs.on()

SENSOR INIT

pn532 = nfc.PN532(spi_dev,cs)
ic, ver, rev, support = pn532.get_firmware_version()
print('Found PN532 with firmware version: {0}.{1}'.format(ver, rev))

Configure PN532 to communicate with MiFare cards

pn532.SAM_configuration()

FUNCTION TO READ

def read_nfc(dev, tmot):
"""Accepts a device and a timeout in millisecs """
print('Reading...')
uid = dev.read_passive_target(timeout=tmot)
if uid is None:
print('CARD NOT FOUND')
else:
numbers = [i for i in uid]
string_ID = '{}-{}-{}-{}'.format(*numbers)
print('Found card with UID:', [hex(i) for i in uid])
print('Number_id: {}'.format(string_ID))

while True:
read_nfc(pn532, 500)

I would like to troubleshoot but I am not understanding the code, especially whatever "cs" is.

[AlexZhu2]

Hi @datboi2008 have you found a solution? I'm having the same issue. I'm only wiring the necessary wires just like you did. However, I encountered "RuntimeError: Failed to detect the PN532". I have located the problem to _wait_ready function, specifically line "self._spi_write_readinto(status_query, status)".