Adafruit-PN532 | Arduino library for SPI and I2C access

by adafruit C++ Version: 1.3.0 License: Non-SPDX

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | Adafruit-PN532 Summary

Adafruit-PN532 is a C++ library typically used in Internet of Things (IoT), Raspberry Pi, Arduino applications. Adafruit-PN532 has no bugs, it has no vulnerabilities and it has low support. However Adafruit-PN532 has a Non-SPDX License. You can download it from GitHub.

This is a library for the Adafruit PN532 NFC/RFID breakout boards This library works with the Adafruit NFC breakout. Check out the links above for our tutorials and wiring diagrams These chips use I2C or SPI to communicate.

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Support

Adafruit-PN532 has a low active ecosystem.

It has 378 star(s) with 247 fork(s). There are 43 watchers for this library.

It had no major release in the last 12 months.

There are 17 open issues and 47 have been closed. On average issues are closed in 987 days. There are 16 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of Adafruit-PN532 is 1.3.0

Quality

Adafruit-PN532 has 0 bugs and 0 code smells.

Security

Adafruit-PN532 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

Adafruit-PN532 code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

Adafruit-PN532 has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

Adafruit-PN532 releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

It has 275 lines of code, 18 functions and 5 files.

It has medium code complexity. Code complexity directly impacts maintainability of the code.

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Adafruit-PN532 Key Features

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Adafruit-PN532 Examples and Code Snippets

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Community Discussions

Trending Discussions on Adafruit-PN532

How does the NDEF Header work when the Payload is bigger than 1 Byte?

NFC Mifare Desfire Memory block structure

QUESTION

How does the NDEF Header work when the Payload is bigger than 1 Byte?

Asked 2020-Sep-17 at 05:24

I am trying to understand how a Mifare Ultralight Chip, I've got, works. This page pretty much explains it for normal circumstances: https://learn.adafruit.com/adafruit-pn532-rfid-nfc/ndef (At the very end of the page)

But now I have the problem that I want to write data on the chip that is bigger than 254 Byte. As an example, I am writing 493 'A's on it (With the 7 Byte Header, the Data will be 500 Byte overall). Here's what I get from reading the chip (the numbers are in decimal, not hex, so instead of '0xFF' it will say '255'):

...

ANSWER

Answered 2020-Sep-16 at 12:56

This is difficult to answer without the exact chip type and then examining it's datasheet.

But I think you are probably getting confused by reading the information from Adafruit as is not the full specification of all the possibilities and it is for a Mifare Classic 1K Card which is not a NFC Standard Type chip and not the same as an Ultralight . How a NDEF message is put on this chip is propitiatory for Classic cards and is fully detailed at https://www.nxp.com/docs/en/application-note/AN1304.pdf

For an Utralight chip are compatible with NFC Type 2 specification, details how it is compatible is at https://www.nxp.com/docs/en/application-note/AN1303.pdf

For the full NFC Type 2 Spec is available at http://apps4android.org/nfc-specifications/NFCForum-TS-Type-2-Tag_1.1.pdf

The full NDEF spec is also available at https://github.com/haldean/ndef/blob/master/docs/NFCForum-TS-NDEF_1.0.pdf

So there are number of factors that will affect the size calculation including Short of Standard Records, Chunking, etc.

Hopefully if you read all the correct documentation you will be able get an answer as that Adafruit link is not right for your chip and a very simplified explanation.

Also note that writing the numbers in Decimal not the standard Hex make it a very difficult read as most specs are detailed in Hex.

Source https://stackoverflow.com/questions/63916741

QUESTION

NFC Mifare Desfire Memory block structure

Asked 2020-Jun-15 at 21:16

I'm trying to understand the Mifare EEPROM memory structure. I found out this guide which was quite helpful. In below it covers the Memory block structure:

1K Cards - 16 sectors of 4 blocks each (sectors 0..15)

4K Cards - 32 sectors of 4 blocks each (sectors 0..31) and 8 sectors of 16 blocks each (sectors 32..39)

It covers only the classic series and I'm not sure if it is identical for the Desfire series Memory block structure.

Also, I want to use Desfire 8K cards and don't know how many 4blocks and 16blocks sectors it has. I tried to read the official datasheet but I couldn't understand this part.

...

ANSWER

Answered 2020-Jun-15 at 18:41

The Mifare Desfire series of products don't have any block structure you can access, they are type 4 NFC cards.

Type 4 cards use Command application protocol data unit (C-APDU) and a file type structure to save data.

See the NFC Type 4 spec at http://apps4android.org/nfc-specifications/NFCForum-TS-Type-4-Tag_2.0.pdf and the Datasheet for a Desfire (EV3) card https://www.nxp.com/docs/en/data-sheet/MF3DHx3_SDS.pdf

That guide is specific to the Mifare Classic series of Cards

Source https://stackoverflow.com/questions/62310805

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