busPirate-python-24AA512

A collection of python functions that interacts with the Bus Pirate in bitbang mode to read and write data to a 24AA512 EEPROM via I2C.

Bus Pirate ~$30

Microchip MPLAB PM3 ~$900

It's a work in progress, but the basics are as follows:

Runs with python 2.7

Examples

# Overwrite every byte in the EEPROM with 0xff
python bpBitbang24AA512.py -o 255 

# Read 0x2000 bytes of the EEPROM into a file called temp.bin starting at 0x00 0x00 high and low address 
python bpBitbang24AA512.py -r -s 0000 -c 8192 -f temp.bin

# Write the data from the test.txt file to the EEPROM starting at address 0x00 0x00
python bpBitbang24AA512.py -w -f test.text

optional arguments:

-h, --help show this help message and exit

--port PORT, -p PORT Serial port device

--baud BAUD, -b BAUD Serial port baud rate

--start START, -s START

• 2 byte Start address to begin reading/writing from in hex (i.e. 0000 or f8d0)

--chunk CHUNK, -c CHUNK

• How many chunk bytes to either read or write

--file FILE, -f FILE

• The file to be used for writing to EEPROM or to be saved as output when reading from EEPROM: if omitted for reading then to stdout

--read, -r

• Read from the EEPROM

--write, -w

• Write to the memory spaces

--overwrite OVERWRITE, -o OVERWRITE

• Overwrite the EEPROM with a byte

Future to dos

There's certainly more improvement that can be made, but from my initial standpoint it's significantly cheaper to purchase a Bus Pirate than it is for a Microchip mplab pm3.

1. Optimize the write delays so that it doesn't take as long and is still reliable
2. Upon a write, read back the original data and compare byte for byte before printing any success.
3. Make fully compatible with python3