How to pass bootloader version from bootloader to main application

Question

Hi all, 
 I'd like to pass bootloader version (2bytes) from bootloader_util_reset function (bootloader) to the main of application. can help me to acheive that? 
 Thank you for your help in advance.

shibshab · Accepted Answer

You could use the retention registers, each of which is one byte. 
 #import "nrf_power.h"
...
NRF_POWER->GPREGRET = bootloader_version && 0xff;
NRF_POWER->GPREGRET2 =bootloader_version >> 8 && 0xff; 
...
 
 These are retained when performing a standard soft reset NVIC_SystemReset .

How to pass bootloader version from bootloader to main application

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