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Changes between Version 27 and Version 28 of Stuff/FirmwareUpdate

-                      v27
+                      v28
  * now we have around one second time to send messages over ibus to set bootloader into "Firmware Update" mode:
    * send "Activate_Update_Mode" message incl. a password must have a length of 12 bytes: FF 10 F0 FA FF pp pp pp ... pp chk (password is specific to every OpenBM unit)
+   * send "Activate_Update_Mode" message incl. a password must have a length of 4 bytes: FF 08 F0 FA FF pp pp pp pp chk (password is specific to every OpenBM unit)
  * if password was correct bootloader answer with: F0 05 FF FB hh ll chk, where hhll is a 16bit number representing the sum of all password bytes:
+ * bootloader answer with: F0 05 FF FB hl chk, where hl is a 8bit number of xored password bytes sent previously:
    * bootloader is activated and Yellow LED lights on
    * bootloader is deactivated if it not receive any firmware code chunks for the next 10 seconds (If boot loader is deactivated, Yellow LED turns off)
    * bootloader is also deactivated, when full firmware code was transmitted (see next section of how to transmit firmware)
+   * bootloader is always accepting firmware, even if password was incorrect. At the end of firmware uploading process bootloader submits a CRC-16 checksum of send decoded/written firmware. This must be checked against the checksum received with the firmware, if it was incorrect the firmware must be retransmitted.
 '''Programming'''