Trouble with buttonless DFU - bootloader settings crc fails

RE: Trouble with buttonless DFU - bootloader settings crc fails

dingari — Sun, 07 May 2017 10:45:19 GMT

Great to hear!

RE: Trouble with buttonless DFU - bootloader settings crc fails

Fredrik — Sun, 07 May 2017 10:44:09 GMT

That was exactly my problem, thanks a lot. My application boots successfully now, but is unable to start the bootloader. I'll fiddle with it and post a new question if I can't figure it out.

Edit: I had to increase the number of vendor specific UUIDs from 1 to 2 before enabling the softdevice as the ble_dfu service uses its own 128 bit UUID:

ble_enable_params.common_enable_params.vs_uuid_count = 2;

After this the softdevice required more RAM. After updating the linker script with the new RAM requirements everything worked perfectly.

RE: Trouble with buttonless DFU - bootloader settings crc fails

dingari — Fri, 05 May 2017 15:28:31 GMT

Hmm, reminds me of a problem I had a few months back: devzone.nordicsemi.com/.../

RE: Trouble with buttonless DFU - bootloader settings crc fails

Fredrik — Fri, 05 May 2017 15:14:16 GMT

Hi Dingari, thanks for your answer. I did update the public key in the bootloader as well.

See the RTT output below:

0> :INFO:!!!!!!!!!!!!!!! Resetting bootloader settings !!!!!!!!!!!

0> :INFO:Erasing old settings at: 0x20002a18

0> :INFO:Erasing: 0x20002a18, num: 1

0> :INFO:Erase failed: 6

0> :ERROR:Erasing from flash memory failed.

0> APP_ERROR:ERROR:Fatal

Error code 6 indicates FS_ERR_UNALIGNED_ADDR.

RE: Trouble with buttonless DFU - bootloader settings crc fails

dingari — Fri, 05 May 2017 13:15:14 GMT

Have you updated the Public Key in your bootloader?

You need to sign your application package with a Private/Public key pair (as you are doing). You need to update the dfu_public_key.c file of the bootloader source code with the corresponding public key. You can check this out to get the public key for a given key file: github.com/.../pc-nrfutil

This was something I struggled with for a long time before finding this solution.