retained register in sleep mode in nrf52

[abyr]

In the user manual of nrf52832 it is said that ram[n].power are retained registers in sleep mode and that depending on the settings.

One or more RAM sections can be retained in System OFF mode depending on the settings in the RAM[n].POWER registers. RAM[n].POWER are retained registers, see Reset behavior. Note that these registers are usually overwritten by the startup code provided with the nRF application examples.

How can I write in these registers and how can I activate retention ?

I am using s132 and sdk 14.2.0

[Jørgen Holmefjord]

Hi,

There is a RAM Retention Example in the SDK. If you are using softdevice, you either have to disable the softdevice before writing to the POWER registers or use the softdevice API sd_power_ram_power_set().

Best regards,
Jørgen

[abyr]

i a using sdk 14.2.0 and I do not think that function exist any alternative ?

[Jørgen Holmefjord]

SDK 14.2.0 support s132 v5.0.0 which has the exact same function: sd_power_ram_power_set(). The RAM Retention Example is also available.