sd_softdevice_disable takes 48ms to execute, how to make faster

[victor passe]

Hi, we want the DFU code in SDK 10.0 for NRF51 S110 to finish faster. The case we are optimizing is when there is dfu ongoing, just a simple boot.

Currently the main time consuming part is sd_softdevice_disable wich takes ~48ms.

Can we make this go any faster? If we never enable the softdevice we dont need to disable it but then we cant call sd_softdevice_vector_table_base_set.

Any tips?

[Susheel Nuguru]

If you are using internal RC as the clock source, then if the softdevice is disabled at the time of internal clock calibration, then the disable will wait until the calibration is done which could be what you are seeing.

This has been fixed in the softdevice of nRF52 devices where softdevice disable  does not wait for the calibration to complete.