py532lib

Out of the requirements above was born the need for a PN532/i2c package in Python3, so I created a project called py532lib. I chose to use Quick2Wire‘s Python API for Linux as it provides clean access to I2C, SPI, and for GPIO (on RaspberryPI). Currently, only I2C is supported in py532lib, however, in the long run we should be able to add SPI and UART communication capabilities to the PN532 under a single, seamless API.

Please be gentle, as this is my first ever attempt at coding anything in Python! I’ve done my best to make it easy to use, and respect as many PEP8 rules as possible. Forks and pull-requests will be welcomed with open arms.

Wiring

First you’ll need to follow the instructions from my earlier post, about enabling I2C for your RaspberryPi.

Second, you’ll need to make sure that the jumpers on the Adafruit NFC Breakout Board are set for I2C communications.

The wiring schematic above is easy as pie. From the RaspberryPi, simply connect 3.3V and GND to the Breakout Board on JP4, then connect the SDA and SCL signals. As noted in NXP’s PN532 Application Note, 3.3k pull-up resistors should be used. If everything is connected properly, you should be able to see the PN532 on the I2C bus at the RaspberryPI’s shell.

sudo i2cdetect -y 1

     0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- 24 -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Note: If you have an older RaspberryPI, you will need to do “sudo i2cdetect -y 0″ instead.

Software

Now that py532lib are installed and available to your Python’s PATH, you should be able to write the following:

from py532lib.i2c import *
from py532lib.frame import *
from py532lib.constants import *

pn532 = Pn532_i2c()
pn532.SAMconfigure()

card_data = pn532.read_mifare().get_data()

print(card_data)

Now that py532lib is in polling mode, put an NFC card in the Breakout Board’s field, and it will return the card’s data.

Hopefully someone will find this useful! Cheers!

Related Links

• Adafruit NFC Breakout Board
• PN532 at NXP
• LibNFC

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]]> http://hubcitylabs.org/nfc-on-raspberrypi-with-pn532-py532lib-and-i2c/feed/ 10 http://hubcitylabs.org/congrats-to-open7400-winner-of-the-hubcitylabs-prize/ http://hubcitylabs.org/congrats-to-open7400-winner-of-the-hubcitylabs-prize/#comments Sat, 17 Nov 2012 16:51:04 +0000 HubCityLabs http://hubcitylabs.org/?p=374 Congratulations to Easton Elliott from British Columbia, for his winning entry to the Open7400 contest 2012! Easton built a simple 4000 series CMOS 24 hour clock with an elegant design! We’ll be shipping his prize today; a new RaspberryPI 512MB Model B.

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]]> Congratulations to Easton Elliott from British Columbia, for his winning entry to the Open7400 contest 2012! Easton built a simple 4000 series CMOS 24 hour clock with an elegant design!

We’ll be shipping his prize today; a new RaspberryPI 512MB Model B.

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]]> http://hubcitylabs.org/congrats-to-open7400-winner-of-the-hubcitylabs-prize/feed/ 0 http://hubcitylabs.org/come-celebrate-hubcitylabs-1st-birtday-tonight/ http://hubcitylabs.org/come-celebrate-hubcitylabs-1st-birtday-tonight/#comments Sat, 17 Nov 2012 15:42:49 +0000 HubCityLabs http://hubcitylabs.org/?p=370 Join us on Tonight (Saturday November 17th) for HubCityLab’s Birthday Bash! Potluck at 5h30, followed by an evening of console gaming and geekery! BONUS: We’ll be running a LAN game of Counter Strike: Source! It’s going to be a blast, see you there!

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]]> Join us on Tonight (Saturday November 17th) for HubCityLab’s Birthday Bash! Potluck at 5h30, followed by an evening of console gaming and geekery!

BONUS: We’ll be running a LAN game of Counter Strike: Source!

It’s going to be a blast, see you there!

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]]> Join us on Saturday November 17th for HubCityLab’s Birthday Bash! Potluck at 5h30, followed by an evening of console gaming and geekery!

BONUS: We’ll be running a LAN game of Counter Strike: Source!

It’s going to be a blast, see you there!

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