RE: SYSTEM ON mode: RAM retention RTC VS NO RAM retention RTC

Jared — Tue, 15 Mar 2022 12:05:00 GMT

Hi,

RAM retention is by default OFF.

[quote user="826896167"]NRF_POWER->RAM[i].POWERCLR = (POWER_RAM_POWER_S0POWER_Off << POWER_RAM_POWER_S0POWER_Pos) |
(POWER_RAM_POWER_S1POWER_Off << POWER_RAM_POWER_S1POWER_Pos) |
(POWER_RAM_POWER_S0RETENTION_Off << POWER_RAM_POWER_S0RETENTION_Pos) |
(POWER_RAM_POWER_S1RETENTION_Off << POWER_RAM_POWER_S1RETENTION_Pos);[/quote]

You're mixing the correct bitfields, the ones that you're using is for the POWER register not the POWERCLR register. The correct code for testing retention off versus retention on:

#include <stdbool.h>
#include <stdint.h>
#include "nrf_delay.h"
#include "boards.h"

//#define POWER_OFF_RETENTION_OFF
#define POWER_ON_RETENTION_ON
//#define POWER_ON_RETENTION_OFF



  int main(void)

  {

    for(int i = 0; i <= 8; i++)

    {
      #ifdef POWER_OFF_RETENTION_OFF
      NRF_POWER->RAM[i].POWERCLR = (POWER_RAM_POWERCLR_S0POWER_Off << POWER_RAM_POWERCLR_S0POWER_Pos) |
      (POWER_RAM_POWERCLR_S1POWER_Off << POWER_RAM_POWERCLR_S1POWER_Pos) |
      (POWER_RAM_POWERCLR_S0RETENTION_Off << POWER_RAM_POWERCLR_S0RETENTION_Pos) |
      (POWER_RAM_POWERCLR_S1RETENTION_Off << POWER_RAM_POWERCLR_S1RETENTION_Pos);

      #endif

      #ifdef POWER_ON_RETENTION_ON
      
      NRF_POWER->RAM[i].POWER = (POWER_RAM_POWER_S0POWER_On << POWER_RAM_POWER_S0POWER_Pos) |
      (POWER_RAM_POWER_S1POWER_On << POWER_RAM_POWER_S1POWER_Pos) |
      (POWER_RAM_POWER_S0RETENTION_On << POWER_RAM_POWER_S0RETENTION_Pos) |
      (POWER_RAM_POWER_S1RETENTION_On << POWER_RAM_POWER_S1RETENTION_Pos);

      #endif

      #ifdef POWER_ON_RETENTION_OFF
      
      NRF_POWER->RAM[i].POWER = (POWER_RAM_POWER_S0POWER_On << POWER_RAM_POWER_S0POWER_Pos) |
      (POWER_RAM_POWER_S1POWER_On << POWER_RAM_POWER_S1POWER_Pos) |
      (POWER_RAM_POWER_S0RETENTION_Off << POWER_RAM_POWER_S0RETENTION_Pos) |
      (POWER_RAM_POWER_S1RETENTION_Off << POWER_RAM_POWER_S1RETENTION_Pos);
      #endif



    }
     //Go to System Off sleep
     NRF_POWER->SYSTEMOFF = 1;

    while(true)
    {}

  }

best regards
Jared

RE: SYSTEM ON mode: RAM retention RTC VS NO RAM retention RTC

826896167 — Tue, 15 Mar 2022 07:07:16 GMT

NRF_POWER->RAM[i].POWERCLR = (POWER_RAM_POWER_S0POWER_Off << POWER_RAM_POWER_S0POWER_Pos) |
(POWER_RAM_POWER_S1POWER_Off << POWER_RAM_POWER_S1POWER_Pos) |
(POWER_RAM_POWER_S0RETENTION_Off << POWER_RAM_POWER_S0RETENTION_Pos) |
(POWER_RAM_POWER_S1RETENTION_Off << POWER_RAM_POWER_S1RETENTION_Pos);

NRF_POWER->RAM[i].POWERCLR = 0x03FF；

the result NRF_POWER->RAM[i].POWERCLR is 0x0000；my chip is nrf52832，i want to kown my code is ok??

or how to do it(RAM ON/OFF)?

thanks you!

RE: SYSTEM ON mode: RAM retention RTC VS NO RAM retention RTC

Jared — Fri, 11 Mar 2022 10:02:45 GMT

Hi there,

Can you use the debugger in SES and show me screenshot of the RAM[i].POWERCLR registers, as I've shown below:

regards

Jared