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Added UICR check before embedding. #63

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Added UICR check before embedding. #63

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22 changes: 19 additions & 3 deletions uflash.py
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Original file line number Diff line number Diff line change
Expand Up @@ -159,12 +159,28 @@ def embed_hex(runtime_hex, python_hex=None):
return runtime_hex
py_list = python_hex.split()
runtime_list = runtime_hex.split()
# set insertion point
tail_list = runtime_list[-5:]
_UICR = ":020000041000EA"
_SIG = ":04000005" #better name for this constant
insertion_point = -5
if _UICR in tail_list:
# if UICR is present, insert before _UICR
insertion_point += tail_list.index(_UICR)
elif any(_SIG in entries for entries in tail_list):
# otherwise insert before the entry that starts with 04000005
sig = [entries for entries in tail_list if _SIG in entries][0]
insertion_point += tail_list.index(sig)
else:
# else insert before end-of-file record
insertion_point += len(tail_list) - 1

embedded_list = []
# The embedded list should be the original runtime with the Python based
# hex embedded two lines from the end.
embedded_list.extend(runtime_list[:-5])
# hex embedded from insertion point.
embedded_list.extend(runtime_list[:insertion_point])
embedded_list.extend(py_list)
embedded_list.extend(runtime_list[-5:])
embedded_list.extend(runtime_list[insertion_point:])
return '\n'.join(embedded_list) + '\n'


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