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_I2C_ADDR = 0x80
  18 CMD_INFO = 0x99
  19
  20 class bootloader:
  21         def __init__(self, addr):
  22                 self.i2c_addr = addr
  23                 self.boot_addr = 0x0
  24
  25                 if not self.identify():
  26                         raise Exception("Bootloader not running")
  27                 self.pagesize = self.get_pagesize()
  28
  29         def read_mem(self, addr, num):
  30                 self.run_cmd(CMD_READ, addr, num)
  31                 return self.read(num)
  32
  33         def erase(self, addr):
  34                 self.run_cmd(CMD_ERASE)
  35
  36         def erase_all(self):
  37                 self.run_cmd(CMD_ERASE_ALL)
  38
  39         def __compare_memarea(self, addr, data):
  40                 mem_cmp = self.read_mem(addr, self.pagesize)
  41                 if mem_cmp != data:
  42                         print "Expected:", data.encode("hex")
  43                         print "Got:     ", mem_cmp.encode("hex")
  44                         raise Exception("Compare mismatch at 0x%x" % addr)
  45                 return
  46
  47         def __program_memarea(self, addr, data):
  48                 self.run_cmd(CMD_WRITE, addr, self.pagesize, data)
  49                 sleep(0.1)
  50
  51         def compare(self, filename):
  52                 return self.__process_hex(filename, self.__compare_memarea)
  53
  54         def program(self, filename):
  55                 return self.__process_hex(filename, self.__program_memarea)
  56
  57         def __process_hex(self, filename, handle):
  58                 next_addr = None
  59                 buf = ""
  60                 lFirstRow = None
  61
  62                 f = open(filename, "r")
  63                 count=0
  64                 for line in f:
  65                         if line[0] != ':':
  66                                 raise Exception("Bad line start character")
  67                         hex = line[1:].replace("\r\n", "")
  68                         data = hex.decode("hex")
  69                         num = ord(data[0])
  70                         chksum = 0
  71                         for c in data:
  72                                 chksum+=ord(c)
  73                         if chksum % 256 != 0:
  74                                 raise Exception("Checksum error")
  75                         addr, typ, data, chksum = struct.unpack(">HB%ssB" % num, data[1:])
  76
  77                         if typ == 0: # Data Record
  78                                 count+=len(data)
  79                                 if next_addr is not None:
  80                                         if next_addr != addr:
  81                                                 raise Exception("Gap in file")
  82                                 buf_addr = addr-len(buf)
  83                                 buf+=data
  84                                 if len(buf) >= self.pagesize:
  85                                         if not lFirstRow:
  86                                                 # do the first as last one
  87                                                 lFirstRow = (buf_addr, buf[:self.pagesize])
  88                                         else:
  89                                                 print "Addr 0x%x" % buf_addr
  90                                                 handle(buf_addr, buf[:self.pagesize])
  91                                         buf = buf[self.pagesize:]
  92                         elif typ == 3: # Start Segment Address Record
  93                                 self.boot_addr = int(data.encode("hex"), 16)
  94                         elif typ == 1: # End of File Record
  95                                 if len(buf) > 0:
  96                                         # Send unhandled data
  97                                         print "Addr (rest) 0x%x" % buf_addr
  98                                         diff = self.pagesize-len(buf)
  99                                         buf+=chr(0xff)*diff # fill with 0xff
 100                                         handle(buf_addr, buf[:self.pagesize])
 101                                         if lFirstRow: # was first
 102                                                 buf_addr = lFirstRow[0]
 103                                                 buf = lFirstRow[1]
 104                                                 print "Addr (First) 0x%x" % buf_addr
 105                                                 handle(buf_addr, buf)
 106                         else:
 107                                 raise Exception("Unknown type %d" % typ)
 108
 109                         next_addr = addr+num
 110                 print "Byte count:", count
 111                 f.close()
 112
 113         def jump(self, addr):
 114                 self.run_cmd(CMD_JUMP)
 115
 116         def wait_ping(self):
 117                 while(True):
 118                         try:
 119                                 self.identify()
 120                                 break
 121                         except:
 122                                 sleep(1)
 123
 124         def load(self, filename):
 125                 print "Erase..."
 126                 self.erase_all()
 127                 sleep(5)
 128                 self.wait_ping()
 129                 print "Erase Done."
 130                 print "Program..."
 131                 t1 = time()
 132                 self.program(filename)
 133                 print "Time: %.1fs" % (time() - t1)
 134                 print "Compare..."
 135                 t1 = time()
 136                 self.compare(filename)
 137                 print "Time: %.1fs" % (time() - t1)
 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 Exception("Unsupported pagesize")
 168                 return i
 169
 170         def set_i2c_addr(self, addr):
 171                 self.run_cmd(CMD_I2C_ADDR, addr)
 172
 173
 174 def to_bootloader(addr):
 175         dev = i2c(addr)
 176         s = struct.pack("BB", 0xff, 0xa5)
 177         dev.write(s)
 178         dev.close()
 179
 180
 181 if __name__ == "__main__":
 182         usage = "usage: %prog [options] addr [ihex]"
 183         parser = OptionParser(usage=usage)
 184         parser.add_option("-b", "--start-bootloader", action="store_true", dest="bToBoot", default=False, help="Start Bootloader")
 185         parser.add_option("-j", "--jump", action="store_true", dest="bJump", default=False, help="Jump to Program")
 186         parser.add_option("-s", "--set-i2c-addr", dest="i2c_addr", type="int", help="Set I2C address")
 187
 188         (options, args) = parser.parse_args()
 189         if not args:
 190                 print "Missing Address"
 191         else:
 192                 addr = int(args[0], 16)
 193                 if options.bToBoot:
 194                         to_bootloader(addr)
 195                         sleep(1)
 196                 loader = bootloader(addr)
 197                 if options.i2c_addr is not None:
 198                         print "Setting i2c address to 0x%X" % (options.i2c_addr)
 199                         loader.set_i2c_addr(options.i2c_addr)
 200                 if len(args) > 1:
 201                         loader.load(args[1])
 202                 if options.bJump:
 203                         print "Jump to Program"
 204                         loader.jump(0x0)