buttonless app jlink dfu

RE: buttonless app jlink dfu

Stas — Tue, 12 Sep 2017 01:58:16 GMT

Good advice! I need to try. Thanks

RE: buttonless app jlink dfu

MartinBL — Mon, 11 Sep 2017 12:12:10 GMT

Hi @Stas, If I understand your first post correctly you simply want to develop and debug your code without the bootloader in place?

You say that you get the message "no bootloader" when you run your app. If my memory serves me right I believe you will see this message if you try to add the dfu ble service (ble_dfu) without having a valid bootloader in flash. If all this is the case, would it be possible for you to simply avoid adding the dfu service while developing and debugging?

RE: buttonless app jlink dfu

Stas — Sat, 09 Sep 2017 07:26:15 GMT

sorry for long delay. After I commented part of code where we check crc ( if (crc != s_dfu_settings.bank_0.image_crc)), I can program app via Jlink. But I loose ability to do it wirelessly via smartphone. Now after flash bootloader I can see only led 2 on my nrf52dk and can't see now DfuTarg while scanning in nrfconnect. Is it ok? After I uncommented crc checking part of code, I can see both leds and DfuTarg advertises me.

About change crc to 0. if I understood correct we need to change that in settings file generate based on our_app.hex file so in my case it's 0x82461E8A. I've found it in settings.hex. How I have to change it to 0? I tried just replase 82461E8A to 00000000. After that I was not able to merge it with bootoader.hex

RE: buttonless app jlink dfu

Hung Bui — Wed, 30 Aug 2017 17:26:08 GMT

Yes you either can modify the bootloader in nrf_dfu_app_is_valid() function to ignore CRC check remove this: if (crc != s_dfu_settings.bank_0.image_crc)

Or you can edit the bootloader setting and set the CRC to 0. Just do nrfutil settings display setting_file_name.hex to see the CRC and look for that in the hex file to modify it to 0, when CRC set to 0 the bootloader will skip CRC check.

RE: buttonless app jlink dfu

Stas — Tue, 29 Aug 2017 07:44:28 GMT

But it's not convenient do it each time while create app (because I probably need to do it some hundreds times). Could you give an advice how to create app in better way. Just remind I modify buttonless_dfu app in SDK 14. Now I need to update firmware (not in production) each time by OTA.

RE: buttonless app jlink dfu

Hung Bui — Tue, 29 Aug 2017 07:34:59 GMT

@Stas: Note that you need to generate bootloader setting every time you modify the application. The reason is that there is a CRC check in the bootloader setting.

RE: buttonless app jlink dfu

Stas — Mon, 28 Aug 2017 11:53:44 GMT

Thanks. I did the same way in prior sdk (12,13) and it's worked. Actually I thought we must to do it in any case (I mean merge settings app and bootloader hex file).

But buttonless_dfu app in sdk 14 it's not work. I can programm device without changing after ota, but if I change code a little and try to programm, bootloader not start app and in nrf connect app I see DfuTarg.

RE: buttonless app jlink dfu

Hung Bui — Mon, 28 Aug 2017 10:41:49 GMT

Hi Stas,

As I understand you want to flash softdevice, bootloader and application using Jlink. To do that you need to tell the bootloader that you have a valid application. A bootloader setting modification needed. Please have a look at the Appendix A in this guide.