Build with optimization does not work with DFU

RE: Build with optimization does not work with DFU

Matt Barr — Tue, 03 Mar 2015 21:58:35 GMT

Genius, thanks colton!

RE: Build with optimization does not work with DFU

colton — Tue, 03 Mar 2015 04:40:53 GMT

You can have high optimization on and nrf_delay_ms still works. It uses volatile to ensure that it doesn't get optimized away. It does not affect the timing.

I have no idea why, but if you turn off static clustering in the IAR optimizations then the DFU works with high optimization. Not using the DFU static clustering can be enabled but OTA updates static clustering can't be enabled.

RE: Build with optimization does not work with DFU

Nikita — Thu, 28 Aug 2014 15:31:33 GMT

Try to check for asserts in bootloader. Place some test led on inside app_error_handler() and while(1);

RE: Build with optimization does not work with DFU

Nikita — Thu, 28 Aug 2014 15:19:23 GMT

With gcc and keil -Os (-O3) optimization is working fine for DFU.

RE: Build with optimization does not work with DFU

scytulip — Thu, 28 Aug 2014 15:08:59 GMT

I think optimization cannot be applied to any code which relies on hardware performance.

For example, in the API call of nrf_delay_ms, it runs multiple NOP instructions to achieve 1ms unit delay.

In my opinion, if you optimize your code, the compiler may reduce this "redundant" function but totally mess up the timing of your program.

RE: Build with optimization does not work with DFU

Akbar Dhanaliwala — Thu, 28 Aug 2014 14:38:43 GMT

Softdevice s110 v7.0 DFU from SDK6.0

RE: Build with optimization does not work with DFU

Nikita — Thu, 28 Aug 2014 14:37:52 GMT

What version of softdevice and SDK do you use? And what DFU project do you use?

RE: Build with optimization does not work with DFU

Akbar Dhanaliwala — Thu, 28 Aug 2014 14:33:59 GMT

This is what I'm doing step by step:

Open nrf Toolbox v1.9.1 on an Android Device running 4.4.4
In DFU-> Select File->DropBox->select application.hex file
Select Device-> Choose DfuTarg
Upload -> Says: Connecting...->Starting DFU...->Update Failed: Remote DFU Not Supported (3)

-akbar

RE: Build with optimization does not work with DFU

Nikita — Thu, 28 Aug 2014 14:29:57 GMT

I don't quite understand what do you mean. If you compile your bootloader without optimization then DFU works fine, but if you compile it with optimization then DFU fails? How exactly DFU fails? You not able to discover DFU or some troubles when you try to load your application with DFU?