Setting nRF52840 to deep sleep (sytem-off) and waking up on dedicated pin interrupt.

RE: Setting nRF52840 to deep sleep (sytem-off) and waking up on dedicated pin interrupt.

Styve Naoue — Fri, 04 Sep 2020 09:31:39 GMT

Hello,

As previously adviced, I have tested out the recommendations from Martin Lesund but I stumbled into another issue in the nrf_pwr_mgmt_shutdown(nrf_pwr_mgmt_shutdown_t shutdown_type) in nrf_pwr_mgmt.c which calls the following;

/**@brief Function runs the shutdown procedure.
 */
static void shutdown_process(void)
{
    NRF_LOG_INFO("Shutdown started. Type %d", m_pwr_mgmt_evt);
    // Executing all callbacks.
    for (/* m_handlers_iter is initialized in nrf_pwr_mgmt_init(). Thanks to that each handler is
            called only once.*/;
         nrf_section_iter_get(&m_handlers_iter) != NULL;
         nrf_section_iter_next(&m_handlers_iter))
    {
        nrf_pwr_mgmt_shutdown_handler_t * p_handler =
            (nrf_pwr_mgmt_shutdown_handler_t *) nrf_section_iter_get(&m_handlers_iter);
        if ((*p_handler)(m_pwr_mgmt_evt))
        {
            NRF_LOG_INFO("SysOff handler 0x%08X => ready", (unsigned int)*p_handler);
        }
        else
        {
            // One of the modules is not ready.
            NRF_LOG_INFO("SysOff handler 0x%08X => blocking", (unsigned int)*p_handler);
            return;
        }
    }

    PWR_MGMT_CPU_USAGE_MONITOR_SUMMARY();
    NRF_LOG_INFO("Shutdown complete.");
    NRF_LOG_FINAL_FLUSH();

    if ((m_pwr_mgmt_evt == NRF_PWR_MGMT_EVT_PREPARE_RESET)
     || (m_pwr_mgmt_evt == NRF_PWR_MGMT_EVT_PREPARE_DFU))
    {
        NVIC_SystemReset();
    }
    else
    {
        // Enter System OFF.
#ifdef SOFTDEVICE_PRESENT
        if (nrf_sdh_is_enabled())
        {
            ret_code_t ret_code = sd_power_system_off();
            ASSERT((ret_code == NRF_SUCCESS) || (ret_code == NRF_ERROR_SOFTDEVICE_NOT_ENABLED));
            UNUSED_VARIABLE(ret_code);
#ifdef DEBUG
            while (true)
            {
                /* Since the CPU is kept on in an emulated System OFF mode, it is recommended
                 * to add an infinite loop directly after entering System OFF, to prevent
                 * the CPU from executing code that normally should not be executed. */
                __WFE();

            }
            
#endif
             
        }
           
#endif // SOFTDEVICE_PRESENT
        nrf_power_system_off();
    }
}

The retcode is 2 the ASSERT((ret_code == NRF_SUCCESS) || (ret_code == NRF_ERROR_SOFTDEVICE_NOT_ENABLED)); fails causing the program to crash, being it in Debug as well as in release mode. I also tried the sd_power_system_off() but it fails too with the retcode = 4095.

Could someone have a solution to this ?

Thanks.

RE: Setting nRF52840 to deep sleep (sytem-off) and waking up on dedicated pin interrupt.

Styve Naoue — Mon, 31 Aug 2020 15:38:41 GMT

Hello Martin Lesund

I have been trying out power management library and I used the nrf_gpio_cfg_sense_input(pin Num, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW) to assigne the wakeup pin. This works well in the "Power Management " sample" but when I port it to my firmware and try to use btn 4 to put the device to sleep, it crashes with the following error:

<info> app: Power management allowed to reset to DFU mode.
<error> app: ERROR 3735928559 [Unknown error code] at C:\...\components\libraries\pwr_mgmt\nrf_pwr_mgmt.c:418
PC at: 0x0003DC77
<error> app: End of error report

ret_code_t ret_code = sd_power_system_off(); return 2 from nrf_pwr_mgmt.c line 417, even though the softdevice is enabled.

I could not trace back to the problem, do you have any idea on why this occurs and the solution to it?

Thanks again .

here is the shutdown handler:

/**@brief Handler for shutdown preparation.
*/
bool shutdown_handler(nrf_pwr_mgmt_evt_t event)
{
uint32_t err_code;

if (m_is_ready == false)
{
m_sysoff_started = true;
return false;
}

switch (event)
{
case NRF_PWR_MGMT_EVT_PREPARE_SYSOFF:
NRF_LOG_INFO("NRF_PWR_MGMT_EVT_PREPARE_SYSOFF");
err_code = bsp_buttons_disable();
APP_ERROR_CHECK(err_code);
break;

case NRF_PWR_MGMT_EVT_PREPARE_WAKEUP:
NRF_LOG_INFO("NRF_PWR_MGMT_EVT_PREPARE_WAKEUP");
err_code = bsp_buttons_disable();
// Suppress NRF_ERROR_NOT_SUPPORTED return code.
UNUSED_VARIABLE(err_code);

// err_code = bsp_wakeup_button_enable(BTN_ID_WAKEUP);
// // Suppress NRF_ERROR_NOT_SUPPORTED return code.
// UNUSED_VARIABLE(err_code);

nrf_gpio_cfg_sense_input(24, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);

err_code = bsp_nfc_sleep_mode_prepare();
// Suppress NRF_ERROR_NOT_SUPPORTED return code.
UNUSED_VARIABLE(err_code);
break;

case NRF_PWR_MGMT_EVT_PREPARE_DFU:
NRF_LOG_ERROR("Entering DFU is not supported by this example.");
APP_ERROR_HANDLER(NRF_ERROR_API_NOT_IMPLEMENTED);
break;

case NRF_PWR_MGMT_EVT_PREPARE_RESET:
NRF_LOG_INFO("NRF_PWR_MGMT_EVT_PREPARE_RESET");
break;
}

err_code = app_timer_stop_all();
APP_ERROR_CHECK(err_code);

return true;
}

/**@brief Register application shutdown handler with priority 0. */
NRF_PWR_MGMT_HANDLER_REGISTER(shutdown_handler, 0);

RE: Setting nRF52840 to deep sleep (sytem-off) and waking up on dedicated pin interrupt.

Martin Lesund — Mon, 31 Aug 2020 13:53:59 GMT

Hi Styve,
Sounds good, let me know how it goes.

RE: Setting nRF52840 to deep sleep (sytem-off) and waking up on dedicated pin interrupt.

Styve Naoue — Fri, 28 Aug 2020 20:39:13 GMT

Hello Martin,

thanks for you reply. I would take a look and try to implement as adviced. I will update the ticket with the outcome I get.

RE: Setting nRF52840 to deep sleep (sytem-off) and waking up on dedicated pin interrupt.

Martin Lesund — Fri, 28 Aug 2020 14:39:04 GMT

Hi Styve,

For nRF52840 and using the SDK 16 I would advice looking into the "Power Management " sample in the use that as reference.

For nRF9160 I would advice you to use the Serial LTE modem sample in NCS as reference. Especially the enter_sleep() function as reference.

Best regards,
Martin L.