nrf51822 advertising timeout sleep RAM retention

RE: nrf51822 advertising timeout sleep RAM retention

mm81 — Thu, 04 Jan 2018 08:26:15 GMT

Ok, understand thanks!

RE: nrf51822 advertising timeout sleep RAM retention

ovrebekk — Thu, 04 Jan 2018 08:21:50 GMT

When configuring the ble_advertising module you will usually register an event handler in the application, that allows you to change the advertising behavior without having to change the module itself.

In the standard examples this function is called on_adv_evt(..):

static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    uint32_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
            APP_ERROR_CHECK(err_code);
            break;
        case BLE_ADV_EVT_IDLE:
            sleep_mode_enter();
            break;
        default:
            break;
    }
}

Best regards

RE: nrf51822 advertising timeout sleep RAM retention

mm81 — Wed, 03 Jan 2018 13:35:50 GMT

Or you mean i should create a customized version of ble_advertising_on_ble_evt() and call it instead?

RE: nrf51822 advertising timeout sleep RAM retention

mm81 — Wed, 03 Jan 2018 13:26:26 GMT

Thank. I am modifing the ble_advertising.c itself.

Understood, I am new to NRF51 development.

Could you advise where should I modify on application level if i do not want the device go to deep sleep after advertising timeout?

RE: nrf51822 advertising timeout sleep RAM retention

ovrebekk — Wed, 03 Jan 2018 11:32:19 GMT

Do you mean you changed the advertising event handler, or the ble_advertising.c file itself?
Changing the SDK libraries and drivers is not recommended if you can avoid it.

Also, when using the SoftDevice you should use sd_app_evt_wait(), rather than calling __WFE() directly.

Best regards

RE: nrf51822 advertising timeout sleep RAM retention

mm81 — Wed, 03 Jan 2018 04:10:25 GMT

Thanks Torbjørn. Turns out I discovered my problem is the device got RESET when the advertisement got timeout.

I suppose this is because I have some ADC operation going on and the timer and ppi wakes up the mcu from deep sleep.

I have modified ble_advertising.c to change the action of advertising time out from system off to WFE and the problem is solved.

RE: nrf51822 advertising timeout sleep RAM retention

ovrebekk — Tue, 02 Jan 2018 12:46:46 GMT

When using the SoftDevice you should use the sd_power_ramon_set() function to access the RAMON register.

To enable RAM retention both in system ON and system OFF make sure to set both the OFFRAM0/1 fields and the ONRAM0/1 fields.

Best regards
Torbjørn Øvrebekk

RE: nrf51822 advertising timeout sleep RAM retention

mm81 — Wed, 27 Dec 2017 09:06:44 GMT

i have put the following code below trying to prevent data loss after advertising timeout but failed...any idea?? // 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);