crc16 is checking??

[sosse]

Hello, I am using nrf51822 and SDK11, dual bank dfu ble, S130, 2.0.0.

I made dfu zip file and I modify firmware_crc16 value to the wrong one. And I zip it again.

But I can successfully upload with nRF Toolbox DFU. I set the break point in "dfu_init_postvalidate", but I don't know why, but the two value, received_crc and image_crc is always same value. m_extended_packet is not the value that I wrote in my init_packet_data, "firmware_crc16". Can you explain why? Thank you.

[Wojtek]

Wher did you modify, in .json file? It is not sent to the device. There is a .dat or some other binary (as far as i remember) from where that value is actually taken. You can modify it by some hex editor.

[Wojtek]

I am not sure what .json is used for - maybe it is used by mobile nRF Connect app? dunno. Anyway, about .dat file structure... Compare it with the .json file content, it should be very similar. If not, i think it might be the same structure as the init packet - check it in documentation of bootloader used in SDK You are using.