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84 lines
2.1 KiB
Python
84 lines
2.1 KiB
Python
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# See comment in stm32w_flasher.py.
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# Extraction and little adaptation performed by E.Duble (CNRS, LIG).
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import struct
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class Error(Exception):
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"""Base class for exceptions in this module."""
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args = None
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message = None
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class FileFormatError(Error):
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"""
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Exception raised for errors in the file format
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Attributes:
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filename -- filename with unknown format
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message -- format error message
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"""
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args = None
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message = None
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def __init__(self, filename, message):
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self.filename = filename
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self.message = message
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class fileFormatReader(object):
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def __init__(self, filename, startAddress=None):
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self.filename = filename
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self.startAddress = startAddress
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def getRawBinary(self):
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fileContent = None
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bytes = None
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f = open(self.filename, 'rb')
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if self.filename[-4:] == '.bin':
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bytesRaw = f.read()
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bytes = []
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bytes.extend(struct.unpack(('B' * len(bytesRaw)), bytesRaw))
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f.close()
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else:
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if self.filename[-4:] == '.s37':
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fillChar = 255
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fileContent = f.readlines()
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f.close()
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startAddress = None
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currentAddress = None
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bytes = []
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for line in fileContent:
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if line[:2] == 'S3':
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count = int(line[2:4], 16)
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if startAddress is None:
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startAddress = int(line[4:12], 16)
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currentAddress = startAddress
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address = int(line[4:12], 16)
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if currentAddress < address:
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bytes = (bytes + ([fillChar] * (address - currentAddress)))
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currentAddress = address
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else:
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if currentAddress > address:
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raise FileFormatError(self.filename, 'S37, Non progressing addresses detected')
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for i in range((count - 5)):
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bytes = (bytes + [int(line[(12 + (i * 2)):((12 + (i * 2)) + 2)], 16)])
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continue
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currentAddress = (currentAddress + (count - 5))
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continue
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else:
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if line[:2] == 'S0':
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continue
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else:
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if line[:2] == 'S7':
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break
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else:
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raise FileFormatError(self.filename, 'S37: unknown field type')
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self.startAddress = startAddress
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else:
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raise FileFormatError(self.filename, 'Unknown extension')
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return (self.startAddress, bytes)
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