EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

tools/targets/LPC.py@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 """
be_bryan 0:b74591d5ab33 2 mbed SDK
be_bryan 0:b74591d5ab33 3 Copyright (c) 2011-2013 ARM Limited
be_bryan 0:b74591d5ab33 4
be_bryan 0:b74591d5ab33 5 Licensed under the Apache License, Version 2.0 (the "License");
be_bryan 0:b74591d5ab33 6 you may not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 7 You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 8
be_bryan 0:b74591d5ab33 9 http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 10
be_bryan 0:b74591d5ab33 11 Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 12 distributed under the License is distributed on an "AS IS" BASIS,
be_bryan 0:b74591d5ab33 13 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 14 See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 15 limitations under the License.
be_bryan 0:b74591d5ab33 16
be_bryan 0:b74591d5ab33 17
be_bryan 0:b74591d5ab33 18 http://www.nxp.com/documents/user_manual/UM10360.pdf
be_bryan 0:b74591d5ab33 19
be_bryan 0:b74591d5ab33 20 32.3.1.1 Criterion for Valid User Code
be_bryan 0:b74591d5ab33 21 The reserved Cortex-M3 exception vector location 7 (offset 0x1C in the vector table)
be_bryan 0:b74591d5ab33 22 should contain the 2's complement of the check-sum of table entries 0 through 6. This
be_bryan 0:b74591d5ab33 23 causes the checksum of the first 8 table entries to be 0. The boot loader code checksums
be_bryan 0:b74591d5ab33 24 the first 8 locations in sector 0 of the flash. If the result is 0, then execution control is
be_bryan 0:b74591d5ab33 25 transferred to the user code.
be_bryan 0:b74591d5ab33 26 """
be_bryan 0:b74591d5ab33 27 from struct import unpack, pack
be_bryan 0:b74591d5ab33 28
be_bryan 0:b74591d5ab33 29
be_bryan 0:b74591d5ab33 30 def patch(bin_path):
be_bryan 0:b74591d5ab33 31 with open(bin_path, 'r+b') as bin:
be_bryan 0:b74591d5ab33 32 # Read entries 0 through 6 (Little Endian 32bits words)
be_bryan 0:b74591d5ab33 33 vector = [unpack('<I', bin.read(4))[0] for _ in range(7)]
be_bryan 0:b74591d5ab33 34
be_bryan 0:b74591d5ab33 35 # location 7 (offset 0x1C in the vector table) should contain the 2's
be_bryan 0:b74591d5ab33 36 # complement of the check-sum of table entries 0 through 6
be_bryan 0:b74591d5ab33 37 bin.seek(0x1C)
be_bryan 0:b74591d5ab33 38 bin.write(pack('<I', (~sum(vector) + 1) & 0xFFFFFFFF))
be_bryan 0:b74591d5ab33 39
be_bryan 0:b74591d5ab33 40
be_bryan 0:b74591d5ab33 41 def is_patched(bin_path):
be_bryan 0:b74591d5ab33 42 with open(bin_path, 'rb') as bin:
be_bryan 0:b74591d5ab33 43 # The checksum of the first 8 table entries should be 0
be_bryan 0:b74591d5ab33 44 return (sum([unpack('<I', bin.read(4))[0] for _ in range(8)]) & 0xFFFFFFFF) == 0
be_bryan 0:b74591d5ab33 45
be_bryan 0:b74591d5ab33 46
be_bryan 0:b74591d5ab33 47 if __name__ == '__main__':
be_bryan 0:b74591d5ab33 48 bin_path = "C:/Users/emimon01/releases/emilmont/build/test/LPC1768/ARM/MBED_A1/basic.bin"
be_bryan 0:b74591d5ab33 49 patch(bin_path)
be_bryan 0:b74591d5ab33 50 assert is_patched(bin_path), "The file is not patched"