NRF52832：Request the app.bin structure explain of nrf5283

[Alan.xiao]

Hi, everyone!

I have created DFU zip packet through the nrfutil tools, adopt sdk is 15.0.0 and softdevice s132_nrf52_6.1.1.

the DFU zip is extracted to app.bin and app.dat

when we open up the firmware binary(app.bin), pls check out the picture, we see the contents as shown in the screenshot here.

We'd like to understand the structure of the binary. The first 220 bytes seem like a header of sorts.

Do you have a document or a diagram that explains the various fields in a FW binary?

[Turbo J]

Just look at the linker script. This is a raw firmware binary.

The first ~200 bytes are the interrupt vector table. Not sure if that is fully covered in the PS, this is basic ARM v7m stuff and thus covered in the ARM Architecture Reference Manual for Cortex-M4 or Arm-v7m.

[Alan.xiao]

Oh, thanks!

How can i get the hash signature value or crc value of the firmware binary(app.bin)

[Hung Bui]

Hi Xiaorz,

The app.bin itself doesn't contain the hash value. It's just the application binary image. 

The hash of the binary image and the CRC is contained in the init data .dat file. The format of the .dat file can be found here: 
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_bootloader_dfu_validation.html?cp=9_1_3_5_1_1_0#lib_bootloader_dfu_init