Static data not cleared by 'arm_startup_nrf51.s'

[Bengt Florin]

It seems that static and global data is NOT set to zero during start-up. This is supposed to happen according to the C-standard. How to do this in a proper manner, i.e. to get the addresses (begin..end) of this block of memory?

[Bengt Florin]

Well I just found a checkbox in the 'target' tab in 'project options' for RAM settings called 'noinit', by unchecking that data seems to be set to zero. So business as usual again.

[Ole Morten]

As you've found out, this zeroing is not supposed to happen in the actual assembly file, but is handled in the __main method, that the Reset_Handler branches to at the end. Whether or not zeroing is done is then dependent on the target options selected in µVision.

See also this question.

[Bengt Florin]

Yepp, I first thought that __main was 'my' main, but I realized that it must be in the C-lib. This is one of all the important things to learn when you start with a new silicon or a new compiler.

[KnightYusuf]

Thank you very much it"s working