https://github.com/hlfshell/golang-nfc-test
A with instructions to setup and run the PN532 NFC Chip on Raspberry Pi w/ Golang.
https://github.com/hlfshell/golang-nfc-test
Last synced: 9 months ago
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A with instructions to setup and run the PN532 NFC Chip on Raspberry Pi w/ Golang.
- Host: GitHub
- URL: https://github.com/hlfshell/golang-nfc-test
- Owner: hlfshell
- Created: 2020-12-13T00:24:01.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2020-12-13T23:12:45.000Z (over 5 years ago)
- Last Synced: 2025-02-09T17:14:52.585Z (over 1 year ago)
- Language: Go
- Size: 2.4 MB
- Stars: 2
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# golang NFC Tests
These were tests to get the `PN532` chip found on a lot of low cost NFC readers out there working with the Raspberry Pi - and then getting it to work with GoLang. There are two tests within. These mini-projects are to see overall feasability for a future project - an NFC controller music and podcast player.
* `simple-nfc-test` - just a test NFC app that will detect an NFC card read its UID off of it.
* `music-player` - specify an mp3 location at startup. When the NFC card is present, it will play the music. It will pause as soon as the NFC card is removed.
The rest of this documentation has links and a general explanation for how I got various libraries installed and working.
# Installation
## Enable serial port on Raspberry Pi
```
sudo raspi-config
```
Then go to `Interface Options` -> `Serial Port`
Disable login shell and enable serial port hardware.
## Install nfclib-1.8.0
```
wget https://github.com/nfc-tools/libnfc/releases/download/libnfc-1.8.0/libnfc-1.8.0.tar.bz2
tar -xvjf libnfc-1.8.0.tar.bz2
cd libnfc-1.8.0.tar.bz2
sudo mkdir /etc/nfc
sudo mkdir /etc/nfc/devices.d
sudo vim /etc/nfc/devices.d/pn532_uart_on_rpi.conf
```
For the `pn532_uart_on_rpi.conf` set the following:
```
name = "PN532 board via UART"
connstring = pn532_uart:/dev/ttyS0
allow_intrusive_scan = true
```
**Important Note**: The serial port `/dev/ttyS0` would be `/dev/ttyAMA0` on Raspberry Pi's older than the 3 or with Zero's - on the 3+ `/dev/ttyAMA0` is used by the Bluetooth hardware, meaning a lot of documentation and default examples will fail as its pointing to a different serial port.
The rest follows the Adafruit installation guide [here](https://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi/building-libnfc):
```
sudo apt-get install autoconf
sudo apt-get install libtool
sudo apt-get install libpcsclite-dev libusb-dev
autoreconf -vis
./configure --with-drivers=pn532_uart --sysconfdir=/etc --prefix=/usr
sudo make clean
sudo make install all
```
You can test if it's working (and if your hardware is connected) via `nfc-list` or `nfc-poll`. `nfc-list --version` will tell you what version of nfc-lib you are currently using. Ensure that it's `1.8.0`.
## Connecting the hardware
The `PN532` board I had needed 5V for its power so I used a level shifter in order to facilitate communication between the Pi and the NFC Chip. See the quick ugly diagram below for wiring:
## Go Example
I utilized [clausecker's nfc module](https://github.com/clausecker/nfc) for go. The example code for a quick nfc scan is in `main.go`
## Specifying Connection String
I eventually started including the connection string, `pn532_uart:/dev/ttyS0`, when opening a connection instead of relying on `libnfc`'s auto scan feature. Somehow after a reboot autoscan stopped working, despite specifying the reader's location working flawlesly.