https://devzone.nordicsemi.com/f/nordic-q-a/42298/radio-mode-configuration-in-nrf52832Hi, we made a custom board with nrf52832 and flashed example code experimental_ble_app_proximity from sdk15. We are trying to change the radio mode to 2Mbits/sec BLE. While trying to set the values in radio MODE register before ble_stack_init() inen-USTelligent Community 13Wed, 09 Jan 2019 16:56:26 GMThttps://devzone.nordicsemi.com/thread/164774?ContentTypeID=1Wed, 09 Jan 2019 16:56:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:24f3f279-d19a-4fbc-a64b-0f23c7c4ca98J&#248;rgen Holmefjord<p>Hi,</p> <p>The <a href="https://www.nordicsemi.com/DocLib/Content/SoftDevice_Spec/s132/latest/SDS/s1xx/sd_resource_reqs/hw_block_interrupt_vector">RADIO peripheral is blocked by the softdevice</a> when this is enabled. Trying to modify the registers directly will lead to invalid memory address error and a softdevice assert. You need to configure the softdevice to use 2 Mbit PHY, using softdevice API.</p> <p>Note that it is not possible to advertise on 2 Mbit PHY according to Bluetooth specifications. You can either send a <a href="https://www.nordicsemi.com/DocLib/Content/SoftDevice_API_Doc/S132/v6-1-0/group_ble_gap_functions?682#gab845ddf7b56ef556ab9c2c74d5199ff8">PHY update request</a> after connection, or you can set <a href="https://www.nordicsemi.com/DocLib/Content/SDK_Doc/nRF5_SDK/v15-2-0/structble__adv__modes__config__t?3265#adb7d2b14c6163d2a376cf98230693fae">secondary PHY</a> in the advertising configuration, to allow devices to connect on 2 Mbit PHY.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>