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47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
"""
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Module to read intel hex files into binary data blobs.
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IntelHex files are commonly used to distribute firmware
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See: http://en.wikipedia.org/wiki/Intel_HEX
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This is a python 3 conversion of the code created by David Braam for the Cura project.
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"""
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import io
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def readHex(filename):
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"""
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Read an verify an intel hex file. Return the data as an list of bytes.
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"""
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data = []
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extraAddr = 0
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f = io.open(filename, "r")
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for line in f:
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line = line.strip()
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if len(line) < 1:
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continue
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if line[0] != ':':
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raise Exception("Hex file has a line not starting with ':'")
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recLen = int(line[1:3], 16)
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addr = int(line[3:7], 16) + extraAddr
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recType = int(line[7:9], 16)
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if len(line) != recLen * 2 + 11:
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raise Exception("Error in hex file: " + line)
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checkSum = 0
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for i in range(0, recLen + 5):
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checkSum += int(line[i*2+1:i*2+3], 16)
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checkSum &= 0xFF
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if checkSum != 0:
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raise Exception("Checksum error in hex file: " + line)
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if recType == 0:#Data record
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while len(data) < addr + recLen:
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data.append(0)
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for i in xrange(0, recLen):
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data[addr + i] = int(line[i*2+9:i*2+11], 16)
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elif recType == 1: #End Of File record
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pass
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elif recType == 2: #Extended Segment Address Record
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extraAddr = int(line[9:13], 16) * 16
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else:
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print(recType, recLen, addr, checkSum, line)
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f.close()
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return data
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