I2C memory target

I2C EEPROM reading, writing on ESP32

Q: Can ESP32 Bit Pirate dump I2C EEPROMs?

Yes. Scan the bus first, then use the dedicated eeprom shell to probe, analyze, read bytes or dump the EEPROM.

Wire I2C EEPROM chips to ESP32 or ESP32-S3 and use ESP32 Bit Pirate to scan addresses, open the EEPROM shell, probe chip size, read bytes, dump EEPROM and recover I2C bus problems.

Start here when connecting 24Cxx/I2C EEPROM parts to ESP32 for address detection, the dedicated eeprom shell, safe probe/read/dump actions and bus recovery. Confirm pull-ups, voltage and chip size before writing.

I2C
EEPROM
eeprom shell
recover

Open recipes Choose a board

reading and writing

Start with I2C EEPROM scan and dump

Confirm the EEPROM family, voltage, address pins and pull-ups before writing. Scan the I2C bus first, then probe the chip size and create a dump before any byte write or erase action.

01
Identify the EEPROM family, voltage and address pin configuration.
02
Scan the I2C bus to confirm the responding 7-bit address.
03
Open the dedicated eeprom shell instead of treating EEPROM memory like generic raw registers.
04
Use probe, analyze, read bytes and dump from the shell before any write or erase operation.
05
Use recovery actions if SDA or SCL is held low.

Example CLI flow

mode i2c
scan
eeprom        # default 0x50 EEPROM shell
eeprom 0x58   # EEPROM shell at a selected address

Use this as a reading and writing preview. In the EEPROM shell, start with Probe/Analyze, then Read bytes or Dump EEPROM before any write or erase action.

hardware reminders

I2C EEPROM wiring notes before power

Confirm SDA, SCL, pull-ups, address straps, write-protect state and EEPROM voltage before connecting the I2C bus.

Wiring View

Generated wiring summary: I2C EEPROM to BP I2C. Confirm the EEPROM address pins and I2C pull-ups before power.

Pull-ups

SDA and SCL need pull-ups; modules may already include them.

Address width

The EEPROM shell handles 1-byte vs 2-byte addressing, page size and 24XX/AT24C-style chip probing better than raw register reads.

Writes

Do not write or erase until the shell has identified the chip and you have a verified backup.

Before wiring a module or target chip, check pinout, voltage, ground reference and whether the selected ESP32-S3 board has the required pins free.

task-level guides

Detailed I2C EEPROM chip recipes

Use these I2C EEPROM guides for address scans, chip probing, dumps, page writes and recovery checks.

Dump I2C EEPROM

Task-level guide with wiring, commands and troubleshooting steps.

Scan unknown I2C device

Task-level guide with wiring, commands and troubleshooting steps.

Recover stuck I2C bus

Task-level guide with wiring, commands and troubleshooting steps.

Run I2C health diagnostics

Task-level guide with wiring, commands and troubleshooting steps.

what it is

What I2C EEPROM is used for

I2C EEPROMs such as 24XX / AT24C-style devices store small configuration blocks, calibration data and board identity information.

practical value

Why use I2C EEPROM with ESP32 Bit Pirate

ESP32 Bit Pirate provides a safe path from scan to the dedicated I2C EEPROM shell, then controlled probe, analyze, read, dump, write/erase and recovery actions when the bus is stuck.

common symptoms