Why does it take so long to run from the end of SystemInit() to the beginning of main()?

RE: Why does it take so long to run from the end of SystemInit() to the beginning of main()?

Sigurd — Wed, 20 Sep 2023 15:51:26 GMT

So you don't see this with any examples in the SDK?

How can I reproduce this ?

RE: Why does it take so long to run from the end of SystemInit() to the beginning of main()?

Dale_J — Tue, 12 Sep 2023 03:38:10 GMT

What's going on in _mainCRTStartup and __libc_init_array?

RE: Why does it take so long to run from the end of SystemInit() to the beginning of main()?

Dale_J — Tue, 12 Sep 2023 02:11:28 GMT

Tested on PCA10056 1.1.0.

The time consumption is the same as our custom board.

And I disabled the bootloader from our firmware, the time consumption did not change.

RE: Why does it take so long to run from the end of SystemInit() to the beginning of main()?

Dale_J — Fri, 08 Sep 2023 07:05:26 GMT

Our firmware has a bootloader, and the example project does not.

I'm talking about application->SystemInit() to application->main().

Do you think it has anything to do with the MBR or Bootloader?

RE: Why does it take so long to run from the end of SystemInit() to the beginning of main()?

Sigurd — Thu, 07 Sep 2023 15:47:55 GMT

Hi,

Do you have a bootloader flashed to the device? is the main() you are referring to the bootloader or the application main()? If you have a bootloader present, the device will reset-> go to the MBR -> Bootloader -> and then the application main(), so this takes time.

RE: Why does it take so long to run from the end of SystemInit() to the beginning of main()?

Dale_J — Thu, 07 Sep 2023 01:07:37 GMT

Thanks!

1) Tested on a custom board. Our DK is broken, will test and get back to you when we find a new DK.

2) It always takes this long.

RE: Why does it take so long to run from the end of SystemInit() to the beginning of main()?

Sigurd — Wed, 06 Sep 2023 11:03:26 GMT

Hi!

1) Are you testing on the nRF52840-DK or a custom board? If you are testing on a custom board, can you check with the DK, and see if you see the same behavior there?

2) Does it always take this long, or does is it only take this long the very first time after programming the firmware to the chip ?