Cura/avr_isp/intelHex.py

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