Eeprom programmer

EEPROM Programmer

Code to program an AT28C256 EEPROM using an Arduino MEGA. Consists of firmware for an Arduino Mega 2560, and an uploader that talks to the firmware via serial USB.

Hardware

The firmware is designed to work with a custom-made board that can be inserted on top of the Arduino's side pin column.

The schematic is as follows:

The pins labeled "Arduino MEGA" go on top the rightmost header columns of the Arduino.

Usage

The uploader can be used as follows:

# You may specify a chain of "commands" to execute. More on commands below.

# Unlock, write a file, and lock again
eeprom-programmer \
    'unlock' \
    'write <file.bin>' \
    'lock'

# Read the EEPROM's first 256 bytes into out.bin
eeprom-programmer 'read out.bin --len=256'

# Doom
eeprom-programmer 'erase'

The CLI supports the following commands:

• read <FILE> [--start=<ADDR>] [--len=<NUM>]: Dumps the EEPROM's contents to <FILE>.
• write <FILE> [--no-verify] [--verify-attempts=<NUM>]: Writes <FILE> to the EEPROM starting at address 0.
• verify <FILE> [--fix] [--max-attempts=<NUM>]: Verifies the EEPROM against <FILE>.
• unlock: Executes the software data protection (SDP) disable algorithm.
• lock: Executes the SDP enable algorithm.
• erase: Executes the software chip erase algorithm.

References

• AT28C256 Datasheet
• Software Chip Erase
• Parallel EEPROM Data Protection