This is if you ever need to program specifically a GLS29EE512 flash EEPROM because maybe your fancy universal programmer can't deal with different pin assignments.

I think this is the same chip as the SST29EE512, but I don't have any of those.

For software, you'll need:

• Arduino IDE
• Python 3.7 or higher with pyserial and tqdm

For hardware, you'll need:

• an Arduino Mega 2560*
• some kind of adapter for your EEPROM
• many patch wires

(*) Other Arduinos should work, but you'll probably need to reassign the ports at the top of GLS29EE512_programmer.ino if you're not using ports A, C, G, and L.

Open GLS29EE512_programmer.ino in the Arduino IDE and press the upload button.

Now connect the pins. See the data sheet for the pin assignments on the EEPROM. The table below includes the Arduino pin to port mappings for my 2560 clone, but you may need to scour the internet for different models.

On my board, getting power from the 5V and GND pins near the GPIO pins was more reliable than the pins on the POWER section of the board.

You should now be able to open the serial monitor in the Arduino IDE and set the baud rate to 500,000. The following will be printed if your EEPROM was detected successfully:

Manufacturer: BF, product: 5D
ready>

Make sure to close the serial monitor before trying to use the programmer script.

Install the script requirements. I recommend doing this in a virtual environment so you're not trapped in Python dependency hell:

pip install -r requirements.txt

If there is one serial device in /dev/ttyACM*, it will be used. Otherwise, you'll need to set the device with the -d <device> option.

To dump the EEPROM contents to output.bin:

gls29ee512.py dump output.bin

To verify the EEPROM contents match input.bin:

gls29ee512.py verify input.bin

To write input.bin to the EEPROM:

gls29ee512.py write input.bin

The arduino's serial port is set to 500,000 baud. It uses a simple line-based protocol with \n line terminators (though \r\n should be tolerated as well).

When the Arduino sends the > character, it is ready to accept commands.

When it sends the # character, it is ready to accept 128 bytes of data (or will output 128 bytes of data in read mode).

Pages are 128 bytes, so valid page numbers are 0 through 511 inclusive for a 64 KiB EEPROM.

help

Print some help text

hexdump <page>

Read a 128 byte page of data and print a hex dump.

read <page>

Read a 128 byte page of data.

After sending this command, wait for a # character and then read the next 128 bytes.

verify <page>

Verify a 128 byte page of data.

After sending this command, wait for a # character and then send the expected 128 bytes of data.

Read the response up to the > character. If it contains the string OK, then the page matches.

write <page>

Write a 128 byte page of data.

After sending this command, wait for a # character and then send the 128 bytes of data to write.

Read the response up to the > character. If it contains the string OK, then the page was successfully written.