nRF52810 with Soft Device - RAM retention settings document and code example required

[SChary]

In my product, the nRF52810 module is kept in system ON sleep mode until a user intervention is executed, upon which the module wakes up. But while in sleep mode the app_timer

interrupt updates a software RTC in the RAM. When the wake up key interrupt is processed, the RAM gets re-initialized.

I want to enable RAM retention for one small area of RAM where I store the RTC value, so that this value is never lost during reset time RAM initialization.

I checked the literature for setting up RAM retention, but could not find a suitable and clear explanation. Can you please share the proper description for the nRF52810.?

Regards

Chary BS

[Einar Thorsrud]

Hi Chary,

If you use system ON low power mode, then RAM retention is on for the whole RAM by default. If you use system OFF, that can be enabled. Using the SoftDevice that must be done via the sd_power_ram_power_set() API function. See POWER and Memory for more details on the POWER registers and which index corresponds which with address range.