Storing variable values in system off mode.

Question

Hi, 
 I need to store few variables values(long a = 4568;) to RAM (might be some other place) when the system went to sytem off mode . 
 How I can achieve in the nRF 51822 version 3.1 controller with SDK 6 and SD S110 . 
 Regards,
Anand

Susheel Nuguru · Accepted Answer

Hi Anand, I am assuming that you are asking on how to put RAM in retention mode just before system off. // Switch on both RAM banks when in System OFF mode. NRF_POWER->RAMON |= (POWER_RAMON_OFFRAM0_RAM0On << POWER_RAMON_OFFRAM0_Pos) | (POWER_RAMON_OFFRAM1_RAM1On << POWER_RAMON_OFFRAM1_Pos); // Enter System OFF and wait for wake up from GPIO detect signal. NRF_POWER->SYSTEMOFF = 0x1; This will put both the RAM banks into retention and your stored values in ram will retain their values after the system wakes up from OFF mode. I would also recommend you to use latest SDK available for your projects. developer.nordicsemi.com/.../ Also do not initialize RAM at every system restart

Storing variable values in system off mode.

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