DFU Post Validate Fails at CRC16

RE: DFU Post Validate Fails at CRC16

Dave_couling — Fri, 29 Apr 2016 19:35:51 GMT

I was simply using the SDK 10 bootloader example project. I generated the zip and init file via nrf.exe (which matched the nrfStudio auto-init CRC generation). Via debugging on the dfu_init_postvalidate() function I saw that the received and correct CRC does not match the one calculated via crc16_compute(). I'm not sure I'm allow to share our encrypted image however. I'll see

RE: DFU Post Validate Fails at CRC16

tesc — Fri, 29 Apr 2016 13:55:55 GMT

I can have a deeper look into this if you provide me with the project and the related files and information for how to reproduce. If you need confidentiality you can create a case on My page, where you attach the project. (Register a user for My page here if you do not already have one.)

RE: DFU Post Validate Fails at CRC16

Dave_couling — Thu, 28 Apr 2016 17:22:36 GMT

This is bizarre because they are definitely returning different results on the same image. I tested calculations but at Bank 1 and Bank 0 in case something occured during the swap. It occurs when the image is encrypted. The nrf.exe calculates the same CRC as nrfStudio on the encrypted image. But the crc16_compute() does not seem to calculate the correct CRC. This suggests that the functions you mentioned are difference in how they calculate.

RE: DFU Post Validate Fails at CRC16

tesc — Thu, 28 Apr 2016 11:48:29 GMT

Do you get this crc mismatch using an SDK example, or is it a custom project?
Are you able to reproduce using an SDK example?

RE: DFU Post Validate Fails at CRC16

tesc — Thu, 28 Apr 2016 11:48:16 GMT

Hi,

crc16_compute() is found in <sdk folder>\components\libraries\crc16\crc16.c
The function used for nrfutils.exe and nRFgo Studio is calc_crc16(), which is published on GitHub

The functions are equivalent.

Regards, Terje