Arduino EEPROM Burner

This repository provides a node.js CLI to read from and write to an AT28C[16 || 64 || 128 || 256] parallel EEPROM using an Arduino and a simple serial protocol.

The address is shifted onto two serial-in / parallel-out 8-bit shift registers (74595) to account for the limited amount of pins available.

Installation

$ npm install -g eeprom

Pinout

The pinout can be edited directly in the .ino file.

| Pin Name | Component | Function | Arduino Pin | | ------------- |:----------:|:-------------------------:| -----------:| | DS | 74HC595 | Address shift input | A0 | | LATCH | 74HC595 | Address output enable | A1 | | CLOCK | 74HC595 | Shift clock | A2 | | CE | EEPROM | Chip Enable | A3 | | OE | EEPROM | Data Output Enable | A4 | | WE | EEPROM | Data Write Enable | A5 | | IO[0..7] | EEPROM | Data Input / Output pins | 2..9 | | Read LED | LED | Optional Read Status LED | 11 | | Write LED | LED | Optional Write Status LED | 12 |

My breadboard implementation is quite bushy right now, I'm planning on designing a clean PCB version.

Command Line Interface

One can read from or read to the EEPROM using a simple node.js CLI.

  Usage: eeprom [options]

  Options:

    -V, --version               output the version number
    -p, --port [port]           the Arduino's Serial Port
    -r, --read [file]           read data from EEPROM into file, prints to stdout if no file provided
    -w, --write [file]          write a file to the EEPROM, uses -data if no file provided
    -b, --bin                   use binary data, defaults to hexadecimal
    -f, --fill-num [num]        fill [start] to [start] + [length] with [num], defaults to 0xff (255)
    -c, --fill-char [char]      fill [start] to [start] + [length] with [char], defaults to 'a'
    -s, --start-address [addr]  Start address of read or write
    -l, --length [addr]         number of bytes to read / fill
    -d, --data [string]         data used for a write if no file is provided
    -g, --hide-progress         disables the progress-bar
    -v, --verbose               enable logging
    -h, --help                  output usage information

Communication Protocol

This simple protocol uses a baud rate of 115 200 (can be modified) to issue commands and send/receive data.

• Five commands are currently implemented: Read in binary : 'r', Read in hex : 'R', Write in binary : 'w', Write in hex : 'W' and Fill with character : 'F'

• Each command is represented by a string with the following format: ['W' || 'w' || 'R' || 'r'],addr,length

• The address and length arguments are 4 ascii encoded hexadecimal digits, so to read the 256 first bytes in rom, one would call 'R,0000,00ff'

• Once a command has been received, a confirmation is sent : "BeginRead\0" for a read command and "BeginWrite"\0 for a write command. The master can then start sending data or reading it.

• To signal the end of a command, the character '%' is sent. A new command can then be issued.

Credits

• mkeller0815's MEEPROMMER from which the .ino file is based
• Build an Arduino EEPROM programmer by Ben Eater