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flash.py
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flash.py
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#!/usr/bin/env python3
import sys
import re
import base64
import os
import tempfile
import subprocess
import argparse
def flash(advertisement_key: str):
advertisement_key_bin = base64.b64decode(advertisement_key)
pattern = b"OFFLINEFINDINGPUBLICKEYHERE!"
advertisement_key_len = len(advertisement_key_bin)
pattern_len = len(pattern)
if advertisement_key_len != pattern_len:
raise ValueError(f"Invalid advertisement key lenght. Expected {pattern_len}, provided key lenght is {advertisement_key_len}")
with open("firmware/nrf51.bin", "rb") as src_firmware, \
tempfile.NamedTemporaryFile("wb", delete=True) as dst_firmware:
data = src_firmware.read()
if pattern not in data:
raise Exception("Invalid firmware file. Adverisement key placeholder is not found")
patched_firmare_bin = re.sub(pattern, advertisement_key_bin, data)
dst_firmware.write(patched_firmare_bin)
subprocess.run([
'openocd',
'-f', 'interface/stlink-v2.cfg',
'-f', 'target/nrf51.cfg',
'-c', f'init; halt; nrf51 mass_erase; program {dst_firmware.name} verify; program {dst_firmware.name}; exit;'
])
if __name__ == "__main__":
# Parse command line arguments
parser = argparse.ArgumentParser(description='Flash the firmware')
parser.add_argument('--advertisement-key', type=str, required=True, help='Key ID to flash')
args = parser.parse_args()
sys.exit(flash(args.advertisement_key))