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**The OOBD Book** Download as [[epub|eBook]] \\ Download as [[|PDF / Mobi]] * [[start|Documentation]] * Installation * [[startup_javame|OOBD-ME (Mobile Phones)]] * [[startup_android|OOBD-Android]] * [[startup_windows|Windows OOBDesk]] * [[startup_embedded|Raspi & Co]] * [[startup_usage|Start the programs]] * [[startup_oobdscript|First Success: Run the OOBD script]] * [[lua_start|Lua in OOBD]] * [[tools_quickscript|Click your Script: Quick Script]] * [[lua_make-your-own-scripts|Make your own OOBD Scripts]] * [[lua_tutorial|The OOBD Lua Tutorial]] * [[lua_make|Lua Build Enviroment]] * Web UI * [[:de:doc:webui_tutorial|Web User Interface Tutorial(German)]] * [[webui_guide|Web UI Package structure]] * [[:de:doc:webui_simulator|UI Emulator for development(German)]] * [[hw_start|The OOBD Hardware]] * [[hw_quickstart|OOBD Cup Quick Start]] * [[hw_assembly-cupv5|Build your own Dongle]] * [[hw_busswitch|Add a second Bus to DXM]] * [[hw_bootloader|Flash the Bootloader]] * [[hw_firmware|Flash the Firmware]] * [[hw_flash-from-usb-stick|Flash the Firmware from USB-Stick]] * [[hw_commands|The Firmware Commands]] * [[tools_start|The OOBD Utilities]] * [[tools_kadaver|Kadaver]] * [[tools_quickscript|Quick Script]] * [[tools_cortex-crc32|Cortex-CRC32]] * [[tools_filelist|Filelist]] * [[tools_olp|OLP]] * [[tools_oobdcopyshop|OOBDCopyShop]] * [[tools_oobdtemple|oobdtemple]] * [[tools_oodbcreate|OODBCreate]] * [[tools_opendiagx|OpenDiagX]] * [[tools_oobdcmd|OOBDcmd]] * [[tools_oobdflash|OOBDFlash]] * PGP * [[pgp_setup|Install PGP Keys]] * [[dev_start|Development]] * [[dev_googlesetup|Join the News]] * Setup your Developer Environment * [[dev_cygwininstall|CygWin Environment]] * [[dev_setupswing|Java Swing]] * [[dev_setupme|Java ME]] * [[dev_setupandroid|Android]] * [[dev_androidlivecd|The Android Debug Live CD]] * [[dev_setupfirmware|Firmware]] * [[dev_clientdesignguide|User Interface Design Guide]] * [[dev_systemspec|The OOBD System Spec]] * [[dev_readotherformats|Import XML files]] * [[dev_links|Link Collection]] * [[dev_roadmap|Road Map]] * [[rfc_start|Specifications (RFC)]] * [[rfc_firmware_syntax|OOBD Firmware: General Command Syntax]] * [[rfc_canuds-mode|OOBD Firmware: Protocol : UDS (P 6 ..)]] * [[rfc_canraw-mode|OOBD Firmware: Protocol : CANraw (P 6 ..)]] * [[rfc_rtd-real-time-data-protocol-for-the-oobd-firmware|OOBD Firmware: Protocol : Real Time Data (RTD) (P 6 ..)]] * [[rfc_pgp-encrypting-sensible-data-with-pgp|PGP Principle]] * [[rfc_onion|The ONION Message Format]] * [[faq|Frequently Asked Questions]]



The firmware of our OOBD cup, the tiny OBD Bluetooth adaptor can be updated in the field via its Bluetooth interface. But as it is a little bit dangerous to flash a device over a wireless unsecure connection, we need to do some protection in case the connection breaks during flashing.

We did it that way that the bootloader is able to identify if the device contains valid firmware or not. If it is valid, the bootloader starts the firmware ready to run, but if it isn't, the bootloader jumps into the flash routine and waits for correct firmware to arrive.

To archive this, the firmware is armended with a additional checksum. The tool cortex_crc32 calculates this sum and add this to the firmware binary, which then can be used for flashing.

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doc/tools_cortex-crc32.txt · Last modified: 2014/03/08 11:42 by admin