1.) Interval/Timouts only taken from _fast_? 2.) SoftDevice s113 limited to 4dbm TX power on nRF52840?

[JoWi]

Hi Forum,

1.) The APP_ADV_... parameters in ble_advertising (SDK 16.0) are taken only from _fast_  , is this intended?

    init.config.ble_adv_slow_enabled = true;
    init.config.ble_adv_slow_interval = APP_ADV_INTERVAL; // Ignored in ble_advertising_init(?)
    init.config.ble_adv_slow_timeout = APP_ADV_DURATION; // Ignored in ble_advertising_init(?)
    /* Error in ble_advertising.c: interval/timeout only from _fast_ ? */
    init.config.ble_adv_fast_enabled = false; // (false by default)
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout = APP_ADV_DURATION;

    init.evt_handler = NULL; // on_adv_evt; (removed)

    err_code = ble_advertising_init(&m_advertising, &init);

2.) s113 allows only TX_POWER of 4dbm, although the nRF52840 has 8dbm?

Best regards,
Jo

(BTW.: the nRF52840 is really an incredible good product!!! If only the documentation was a little bit better..)

[Simonr]

Hi Shahar

Sorry about the delayed reply, but we're in the middle of the summer vacation period here in Norway, and I just got back into the office today. The S113 SoftDevice was designed for the nRF52811 which has a rather limited amount of Flash memory space. Therefore minimizing the Flash memory required by the SoftDevice was prioritized rather than adding support (and this check) for a TX power that the nRF52811 doesn't support. 

Best regards,

Simon

[Shahar]

I got an updated answer via the RSM where 8db TX is scheduled to be added to S113 and S112 (coming in August 2020).

So this seems more like an error or oversight and less than an actual Flash limitation.

This is based on the fact that 8db capability is purely based on hardware capability - and adding one more value to the switch case of values can't take that much flash space...