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#!/usr/bin/env python3
'''
Add a UICR region to the hex firmware for MicroPython on the micro:bit.
Usage: ./adduicr.py <firmware.hex> <version_string_address> [-o <combined.hex>]
Output goes to stdout if no filename is given.
'''
import sys
import struct
import argparse
import hexlifyscript
import makecombinedhex
NRF_PAGE_SIZE_LOG2 = 10
NRF_PAGE_SIZE = 1 << NRF_PAGE_SIZE_LOG2
UICR_BASE_ADDR = 0x100010c0
UICR_MAGIC_NUMBER = 0x17eeb07c
if __name__ == '__main__':
arg_parser = argparse.ArgumentParser(description='Add UICR region to hex firmware for the micro:bit.')
arg_parser.add_argument('-o', '--output', default=sys.stdout, type=argparse.FileType('wt'), help='output file (default is stdout)')
arg_parser.add_argument('firmware', nargs=1, help='input MicroPython firmware')
arg_parser.add_argument('address', nargs=1, type=lambda x: int(x, 0), help='address in flash of the version string')
args = arg_parser.parse_args()
# read in the firmware
with open(args.firmware[0], 'rt') as f:
firmware = f.readlines()
# print head of firmware
for line in firmware[:-2]:
print(line, end='', file=args.output)
# make UICR data
uicr_data = b''
uicr_data += struct.pack('<III', UICR_MAGIC_NUMBER, 0xffffffff, NRF_PAGE_SIZE_LOG2)
uicr_data += struct.pack('<HHII', 0, (makecombinedhex.get_largest_addr(firmware) + NRF_PAGE_SIZE - 1) // NRF_PAGE_SIZE, 0xffffffff, args.address[0])
uicr_data += struct.pack('<I', 0)
# print UICR data
print(hexlifyscript.make_ihex_record(0, hexlifyscript.IHEX_TYPE_EXT_LIN_ADDR, struct.pack('>H', UICR_BASE_ADDR >> 16)), file=args.output)
for i in range(0, len(uicr_data), 16):
chunk = uicr_data[i:min(i + 16, len(uicr_data))]
print(hexlifyscript.make_ihex_record(UICR_BASE_ADDR + i, hexlifyscript.IHEX_TYPE_DATA, chunk), file=args.output)
# print tail of firmware
print(firmware[-2], end='', file=args.output)
print(firmware[-1], end='', file=args.output)
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