bootloader.py

   1 #!/usr/bin/env python
   2 # -*- coding: iso-8859-15 -*-
   3
   4 import struct
   5 import sys
   6 import socket
   7 from optparse import OptionParser
   8 from time import sleep, time
   9 from i2c import i2c
  10
  11 CMD_READ = 0x1
  12 CMD_ERASE = 0x2
  13 CMD_WRITE = 0x3
  14 CMD_ERASE_ALL = 0x5
  15 CMD_JUMP = 0x6
  16 CMD_PAGESIZE = 0x7
  17 CMD_INFO = 0x99
  18
  19 class bootloader:
  20         def __init__(self, addr):
  21                 self.i2c_addr = addr
  22                 self.boot_addr = 0x0
  23
  24                 if not self.identify():
  25                         raise "Bootloader not running"
  26                 self.pagesize = self.get_pagesize()
  27
  28         def read_mem(self, addr, num):
  29                 self.run_cmd(CMD_READ, addr, num)
  30                 return self.read(num)
  31
  32         def erase(self, addr):
  33                 self.run_cmd(CMD_ERASE)
  34
  35         def erase_all(self):
  36                 self.run_cmd(CMD_ERASE_ALL)
  37
  38         def __compare_memarea(self, addr, data):
  39                         mem_cmp = self.read_mem(addr, self.pagesize)
  40                         if mem_cmp != data:
  41                                 print "Expected:", data.encode("hex")
  42                                 print "Got:     ", mem_cmp.encode("hex")
  43                                 raise("Compare mismatch at 0x%x" % addr)
  44                         return
  45
  46         def __program_memarea(self, addr, data):
  47                 self.run_cmd(CMD_WRITE, addr, self.pagesize, data)
  48                 sleep(0.1)
  49
  50         def compare(self, filename):
  51                 return self.__process_hex(filename, self.__compare_memarea)
  52
  53         def program(self, filename):
  54                 return self.__process_hex(filename, self.__program_memarea)
  55
  56         def __process_hex(self, filename, handle):
  57                 next_addr = None
  58                 buf = ""
  59                 lFirstRow = None
  60
  61                 f = open(filename, "r")
  62                 count=0
  63                 for line in f:
  64                         if line[0] != ':':
  65                                 raise("Bad line start character")
  66                         hex = line[1:].replace("\r\n", "")
  67                         data = hex.decode("hex")
  68                         num = ord(data[0])
  69                         chksum = 0
  70                         for c in data:
  71                                 chksum+=ord(c)
  72                         if chksum % 256 != 0:
  73                                 raise("Checksum error")
  74                         addr, typ, data, chksum = struct.unpack(">HB%ssB" % num, data[1:])
  75
  76                         if typ == 0: # Data Record
  77                                 count+=len(data)
  78                                 if next_addr is not None:
  79                                         if next_addr != addr:
  80                                                 raise "Gap in file"
  81                                 buf_addr = addr-len(buf)
  82                                 buf+=data
  83                                 if len(buf) >= self.pagesize:
  84                                         if not lFirstRow:
  85                                                 # do the first as last one
  86                                                 lFirstRow = (buf_addr, buf[:self.pagesize])
  87                                         else:
  88                                                 print "Addr 0x%x" % buf_addr
  89                                                 handle(buf_addr, buf[:self.pagesize])
  90                                         buf = buf[self.pagesize:]
  91                         elif typ == 3: # Start Segment Address Record
  92                                 self.boot_addr = int(data.encode("hex"), 16)
  93                         elif typ == 1: # End of File Record
  94                                 print "Addr (rest) 0x%x" % buf_addr
  95                                 buf_addr+=self.pagesize
  96                                 diff = self.pagesize-len(buf)
  97                                 buf+=chr(0xff)*diff # fill with 0xff
  98                                 handle(buf_addr, buf[:self.pagesize])
  99                                 if lFirstRow: # was first
 100                                         buf_addr = lFirstRow[0]
 101                                         buf = lFirstRow[1]
 102                                         print "Addr (First) 0x%x" % buf_addr
 103                                         handle(buf_addr, buf)
 104                         else:
 105                                 raise("Unknown type %d" % typ)
 106
 107                         next_addr = addr+num
 108                 print "Byte count:", count
 109                 f.close()
 110
 111         def jump(self, addr):
 112                 self.run_cmd(CMD_JUMP)
 113
 114         def wait_ping(self):
 115                 while(True):
 116                         try:
 117                                 self.identify()
 118                                 break
 119                         except:
 120                                 sleep(1)
 121
 122         def load(self, filename):
 123                 print "Erase..."
 124                 self.erase_all()
 125                 sleep(5)
 126                 self.wait_ping()
 127                 print "Erase Done."
 128                 print "Program..."
 129                 t1 = time()
 130                 self.program(filename)
 131                 print "Time: %.1fs" % (time() - t1)
 132                 print "Compare..."
 133                 t1 = time()
 134                 self.compare(filename)
 135                 print "Time: %.1fs" % (time() - t1)
 136                 print "Jump:"
 137                 self.jump(self.boot_addr)
 138
 139         def write(self, s):
 140                 dev = i2c(self.i2c_addr)
 141                 dev.write(s)
 142                 dev.close()
 143
 144         def read(self, num):
 145                 dev = i2c(self.i2c_addr)
 146                 s = dev.read(num)
 147                 dev.close()
 148                 return s
 149
 150         def run_cmd(self, cmd, addr=0x0, num=0, data=""):
 151                 length = len(data)
 152                 s1 = struct.pack("<BLB%ds" % (length), cmd, addr, num, data)
 153                 self.write(s1)
 154                 s2 = struct.pack("B", 0xff)
 155                 self.write(s2)
 156
 157         def identify(self):
 158                 self.run_cmd(CMD_INFO)
 159                 s = self.read(10)
 160                 return s == "Bootloader"
 161
 162         def get_pagesize(self):
 163                 self.run_cmd(CMD_PAGESIZE)
 164                 s = self.read(1)
 165                 i = ord(s[0])
 166                 if i not in [64, 128]:
 167                         raise
 168                 return i
 169
 170
 171 def to_bootloader(addr):
 172         dev = i2c(addr)
 173         s = struct.pack("BB", 0xff, 0xa5)
 174         dev.write(s)
 175         dev.close()
 176
 177
 178 if __name__ == "__main__":
 179         usage = "usage: %prog [options] addr [ihex]"
 180         parser = OptionParser(usage=usage)
 181         parser.add_option("-b", "--start-bootloader", action="store_true", dest="bToBoot", default=False, help="Start Bootloader")
 182         parser.add_option("-j", "--jump", action="store_true", dest="bJump", default=False, help="Jump to Program")
 183
 184         (options, args) = parser.parse_args()
 185         if not args:
 186                 print "Missing Address"
 187         else:
 188                 addr = int(args[0], 16)
 189                 if options.bToBoot:
 190                         to_bootloader(addr)
 191                         sleep(1)
 192                 loader = bootloader(addr)
 193                 if len(args) > 1:
 194                         loader.load(args[1])