MicroPython EEPROM

Downloads Release MicroPython License: MIT codecov CI

MicroPython driver for AT24Cxx EEPROM

General

MicroPython driver for AT24Cxx EEPROM

📚 The latest documentation is available at MicroPython EEPROM ReadTheDocs (opens in a new tab) 📚

Installation

Install required tools

Python3 must be installed on your system. Check the current Python version with the following command

python --version
python3 --version

Depending on which command Python 3.x.y (with x.y as some numbers) is returned, use that command to proceed.

python3 -m venv .venv
source .venv/bin/activate

pip install -r requirements.txt

Setup

Install package with upip

Connect the MicroPython device to a network (if possible)

import network
station = network.WLAN(network.STA_IF)
station.active(True)
station.connect('SSID', 'PASSWORD')
station.isconnected()

General

Install the latest package version of this lib on the MicroPython device

import mip
mip.install("github:brainelectronics/micropython-eeprom")

For MicroPython versions below 1.19.1 use the upip package instead of mip

import upip
upip.install('micropython-eeprom')

Specific version

Install a specific, fixed package version of this lib on the MicroPython device

import mip
# install a verions of a specific branch
mip.install("github:brainelectronics/micropython-eeprom", version="feature/initial-implementation")
# install a tag version
mip.install("github:brainelectronics/micropython-eeprom", version="0.1.0")

For MicroPython versions below 1.19.1 use the upip package instead of mip

import upip
upip.install('micropython-eeprom')

Test version

Install a specific release candidate version uploaded to Test Python Package Index (opens in a new tab) on every PR on the MicroPython device. If no specific version is set, the latest stable version will be used.

import mip
mip.install("github:brainelectronics/micropython-eeprom", version="0.1.0-rc1.dev1")

For MicroPython versions below 1.19.1 use the upip package instead of mip

import upip
# overwrite index_urls to only take artifacts from test.pypi.org
upip.index_urls = ['https://test.pypi.org/pypi']
upip.install('micropython-eeprom')

See also brainelectronics Test PyPi Server in Docker (opens in a new tab) for a test PyPi server running on Docker.

Manually

Upload files to board

Copy the module to the MicroPython board and import them as shown below using Remote MicroPython shell (opens in a new tab)

Open the remote shell with the following command. Additionally use -b 115200 in case no CP210x is used but a CH34x.

rshell --port /dev/tty.SLAB_USBtoUART --editor nano

Perform the following command inside the rshell to copy all files and folders to the device

mkdir /pyboard/lib
mkdir /pyboard/lib/eeprom

cp eeprom/* /pyboard/lib/eeprom

cp examples/main.py /pyboard
cp examples/boot.py /pyboard

Usage

from eeprom import EEPROM
from machine import I2C, Pin

I2C_ADDR = 0x50     # DEC 80, HEX 0x50
EEPROM_SIZE = 32    # AT24C32 on 0x50

# define custom I2C interface, default is 'I2C(0)'
# check the docs of your device for further details and pin infos
i2c = I2C(0, scl=Pin(13), sda=Pin(12), freq=800000)
eeprom = EEPROM(addr=I2C_ADDR, at24x=EEPROM_SIZE, i2c=i2c)

# write 'micropython' to address 10
eeprom.write(10, 'micropython')

# read 11 bytes starting at address 10
eeprom.read(10, 11)

# update content at address 10 with 'MicroPython'
# only changed values are written, here 'm' -> 'M' and 'p' -> 'P'
eeprom.write(10, 'MicroPython')

Contributing

Unittests

Run the unittests locally with the following command after installing this package in a virtual environment

# run all tests
nose2 --config tests/unittest.cfg

# run only one specific tests
nose2 tests.test_eeprom.TestEEPROM.test_addr

Generate the coverage files with

python create_report_dirs.py
coverage html

The coverage report is placed at reports/coverage/html/index.html

Credits

Based on Mike Causer's MicroPython TinyRTC I2C module (opens in a new tab) and the PyPa sample project (opens in a new tab)