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"""
Module to read intel hex files into binary data blobs.
IntelHex files are commonly used to distribute firmware
See: http://en.wikipedia.org/wiki/Intel_HEX
"""
__copyright__ = "Copyright (C) 2013 David Braam - Released under terms of the AGPLv3 License"
import io
def readHex(filename):
"""
Read an verify an intel hex file. Return the data as an list of bytes.
"""
data = []
extraAddr = 0
f = io.open(filename, "r")
for line in f:
line = line.strip()
if line[0] != ':':
raise Exception("Hex file has a line not starting with ':'")
recLen = int(line[1:3], 16)
addr = int(line[3:7], 16) + extraAddr
recType = int(line[7:9], 16)
if len(line) != recLen * 2 + 11:
raise Exception("Error in hex file: " + line)
checkSum = 0
for i in xrange(0, recLen + 5):
checkSum += int(line[i*2+1:i*2+3], 16)
checkSum &= 0xFF
if checkSum != 0:
raise Exception("Checksum error in hex file: " + line)
if recType == 0:#Data record
while len(data) < addr + recLen:
data.append(0)
for i in xrange(0, recLen):
data[addr + i] = int(line[i*2+9:i*2+11], 16)
elif recType == 1: #End Of File record
pass
elif recType == 2: #Extended Segment Address Record
extraAddr = int(line[9:13], 16) * 16
else:
print(recType, recLen, addr, checkSum, line)
f.close()
return data
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