Cura/avr_isp/intelHex.py

   1 __copyright__ = "Copyright (C) 2013 David Braam - Released under terms of the AGPLv3 License"
   2 import io
   3
   4 def readHex(filename):
   5         data = []
   6         extraAddr = 0
   7         f = io.open(filename, "r")
   8         for line in f:
   9                 line = line.strip()
  10                 if line[0] != ':':
  11                         raise Exception("Hex file has a line not starting with ':'")
  12                 recLen = int(line[1:3], 16)
  13                 addr = int(line[3:7], 16) + extraAddr
  14                 recType = int(line[7:9], 16)
  15                 if len(line) != recLen * 2 + 11:
  16                         raise Exception("Error in hex file: " + line)
  17                 checkSum = 0
  18                 for i in xrange(0, recLen + 5):
  19                         checkSum += int(line[i*2+1:i*2+3], 16)
  20                 checkSum &= 0xFF
  21                 if checkSum != 0:
  22                         raise Exception("Checksum error in hex file: " + line)
  23
  24                 if recType == 0:#Data record
  25                         while len(data) < addr + recLen:
  26                                 data.append(0)
  27                         for i in xrange(0, recLen):
  28                                 data[addr + i] = int(line[i*2+9:i*2+11], 16)
  29                 elif recType == 1:      #End Of File record
  30                         pass
  31                 elif recType == 2:      #Extended Segment Address Record
  32                         extraAddr = int(line[9:13], 16) * 16
  33                 else:
  34                         print(recType, recLen, addr, checkSum, line)
  35         f.close()
  36         return data