BBC micro:bit J-Link OB firmware for micro:bit v2.2

RE: BBC micro:bit J-Link OB firmware for micro:bit v2.2

Hieu — Tue, 28 Feb 2023 23:56:45 GMT

Hi Kiet,

I think I get what is going on. To be completely sure, by JLink .hex from Segger's website, do you mean the firmware on this page?
www.segger.com/.../

I look into micro:bit schematic and interface documentation. There is a change in the interface MCU choice between V2.2, V2.0 and V1.x. The interface could be broken if you somehow flash the interface MCU with an incompatible firmware.

Looking at the download list on Segger's website, it is likely that they currently only have firmware for micro:bit V1.x, which uses a Freescale KL26, and for micro:bit V2.0, which uses a Freescale KL27.

Perhaps you could double check with Segger if that is correct? If so, you will need to wait for them to release a firmware for V2.2.

Best regards,

Hieu

RE: BBC micro:bit J-Link OB firmware for micro:bit v2.2

NTNU_TTK4235 — Tue, 28 Feb 2023 12:17:43 GMT

Hi Hieu,

Thank you so much in advance already!

In the past micro:bit (V1 and V2), JLink could be downloaded and installed on the board by simply downloading the .hex file from segger's website, and then drag-and-drop onto the board while it is in MAINTAINCE mode. Shortly afterwards, the board would reformat itself with JLink. This allowed us and the students to flash over .hex files to the micro:bit using .c code. A very quick method for verifying that JLink was successfully installed is through the commando 'nrfjprog -f nrf52 -e' which will prompt the micro:bit to rest by turning of the lights.

The main symptoms that make me suspect that there are incompatibilities are that dragging the JLink .hex file do not result in a restart when using the commando 'nrfjprog -f nrf52 -e'. Instead, we get something like this:

ERROR: No debuggers were discovered.

Best wishes,

Kiet

RE: BBC micro:bit J-Link OB firmware for micro:bit v2.2

Hieu — Fri, 24 Feb 2023 09:21:39 GMT

Hi Kiet,

I am not very familiar with the micro:bit boards, but I will try to support you. Could you please tell me more details? What are the symptoms that make you think there are some incompatibilities?

BR,

Hieu