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EPROM Data Storage Module IIC I2C Interface Data Memory Module

Last update: 27. January 2021 Author: Marian Minar

Schematics of Module: https://pixelelectric.com/at24c256-iic-eeprom-memory-module/

Schematics

Reconnection with Raspberry PI 3+:

Schematics_2

  • Configuration for /dev/i2c-1
  • port 2 (SDA), port 3 (SCL)
  • pull-up resistor is used from module board (R2,R3)

How to install?

git clone https://github.com/mamin27/ecomet_i2c_tools.git

used modules: RPi.GPIO,smbu2,colorama,yaml,re,randrange,os

pip3 install RPi.GPIO smbus2 colorama PyYAML
Looking in indexes: https://pypi.org/simple,
Requirement already satisfied: RPi.GPIO in /usr/lib/python3/dist-packages (0.7.0)
Requirement already satisfied: smbus2 in /usr/local/lib/python3.7/dist-packages (0.3.0)
Requirement already satisfied: colorama in /usr/lib/python3/dist-packages (0.3.7)
Requirement already satisfied: PyYAML in /usr/local/lib/python3.7/dist-packages (5.2)

Check settings in config file (i2c_config.yaml)

Python scipt:

eeprom_mgr.py <option>
   
   option:
     -h help
     -p chip name
     -t run in test mode
     -wipe wipe eeprom
     -r read content of chip
     -w write into chip
     -f file name, used with read and write commands
   
 <-p>,<--chip> chip name:
   list of these chips are usable 24C01,24C02,24C04,24C08,24C16,24C32,24C64,24C128,24C256,24C512,24C1024
   
 <-t>|<--test> test mode:
   test mode will write random number into chip, read contentant and compare
 <--wipe> wipe:
    wipping data at chip (0xff), when used -t data are randomed
 <-r> read:
   read content of chip and write into file <-f>
 <-w> write:
   write content from file <-f> into chip
 Note: when file attribute is not added will be used default file name
 <-m> file mod:
   file could be stored in two mods:
   row - row hexadecimal mode
   wide - explaining hexadecimal mode

Usable Chips

Chip Name Size Address Bits Address Size Tested?
24c01 1-Kbit (128x8) A6 - A0 007F tested
24c02 2-Kbit (256x8) A7 - A0 00FF
24c04 4-Kbit (512x8) A8 - A0 01FF tested
24c08 8-Kbit (1024x8) A9 - A0 03FF tested
24c16 16-Kbit (2048x8) A10 - A0 07FF tested
24c32 32-Kbit (4096x8) A11 - A0 0FFF tested
24c64 64-Kbit (8192x8) A12 - A0 1FFF tested
24c128 128-Kbit (16384x8) A13 - A0 3FFF
24c256 256-Kbit (32768x8) A14 - A0 7FFF
24c512 512-Kbit (65536x8) A15 - A0 FFFF
24c1024 1024-Kbit (1048576x8) A16 - A0 FFFFF

Examples:

Test if eeprom chip is correct. This check write random numbers and compare them with read content. Test will pass full size of EEPROM

python3 eeprom_mng.py -p 24c32 --test

Wipe (write) content of EEPROM with '0xFF' data

python3 eeprom_mng.py -p 24c32 --wipe

Read data into default file in directory data (eeprom_chip.hex)

python3 eeprom_mng.py -p 24c32 --read

Read data into file set with --file attribute

python3 eeprom_mng.py -p 24c32 --read --file=eeprom_my.hex

Write data into EEPROM from default file data/eeprom_chip.hex

python3 eeprom_mng.py -p 24c32 --write

Format of hex file:

0000:  02 ff ff ff  ff ff ff ff  ff ff ff ff  ff ff ff ff
0010:  ff ff ff ff  ff ff ff ff  ff ff ff ff  ff ff 00 11
0020:  ff ff ff ff  ff ff ff ff  ff ff ff ff  ff ff ff ff
0030:  ff ff ff ff  ff ff ff ff  ff ff ff ff  ff ff ff ff
0040:  ff ff ff ff  ff ff ff ff  ff ff ff ff  ff ff ff ff
0050:  ff ff ff ff  ff ff ff ff  ff ff ff ff  ff ff ff ff
0060:  ff ff ff ff  ff ff ff ff  ff ff ff ff  ff ff ff ff
0070:  ff ff ff ff  ff ff ff ff  ff ff ff ff  ff ff ff ff