![]() However it produces a fail.txt and is not valid for newer DAPLink versions.This could have been used to our advantage to write mb1 data and then mb2 data without an EOF record in the middle.If a hex record goes “back”, then DAPLink will stop and produces a fail.txt file.Version 0241 to 0253 can only flash data in sequential addresses.Version 0241+ will stop processing the file after the End-Of-File record.This is because the hex data is processed in blocks of 512 bytes, and the EoF record only stops processing the block which includes it, so subsequent blocks are still processed.Version 0234 does not stop processing the file after the End-Of-File record.All versions of DAPLink need the first hex line to be a valid Intel Hex record.All versions of DAPLink ignore record types after type 0x05.0255: Version released with micro:bit v2.0254: Latest official DAPLink version before this format was defined.0249: Version shipped in micro:bit v1.5.0241: Version shipped in the v1.3B retail version.0234: Version shipped in the original BBC drop, over 800K units with this version.The micro:bit v2 DAPLink interface shall also consume ‘standard’ Intel Hex and bin files for micro:bit V2 (eg produced by Mbed or other tools).The Universal Hex file flash time should be similar (+/- 10%) than the same microbit-v1-only hex file.The Universal Hex file shall flash correctly on a micro:bit V1 with DAPLink v0234 or newer.The Universal Hex file shall flash correctly in a micro:bit V2 with any version of DAPLink.Therefore, a micro:bit Universal Hex is a file that contains the binary data for both micro:bit V1 and micro:bit V2, in a format that the DAPLink can process to only write to memory the data relevant to its board. To easily support our users, we want the online editors to generate a single file that will work in both micro:bit V1 and micro:bit V2. DAPLink is responsible for processing the files dropped into the micro:bit MSD drive and any new file format has to be implemented in that project. The micro:bit V1 and V2 boards use an interface chip with the DAPLink firmware to flash the target microcontroller. ![]() The microcontroller used in the micro:bit V2 (nRF52) is different than the microcontroller used in micro:bit V1 (nRF51), with a different architecture (Arm Cortex M0+ vs Cortex M4), slightly different peripherals, and different hardware components on the board. Universal Hex is a superset of the Intel Hex file format to be able to contain binary code for multiple micro:bit boards or subsystems. The goal of a micro:bit Universal Hex is to be able to create a single-file format that can be flashed into a micro:bit V1 and a micro:bit V2 successfully. □ micro:bit Universal Hex Format Specification
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