https://devzone.nordicsemi.com/f/nordic-q-a/39702/nrf52840BLE Control by Main CPU (MCU): 1. How the MCU communicates with BLE HW? 2. What is the amount of MCU performance is required to control the BLE? (expected answer example: Every 1 mSec the MCU requires 100uSec) 3. During debug time, if I stop theen-USTelligent Community 13Mon, 22 Oct 2018 15:16:40 GMThttps://devzone.nordicsemi.com/thread/153876?ContentTypeID=1Mon, 22 Oct 2018 15:16:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b29853fc-5629-4c34-9840-9af17b1deac2J&#248;rgen Holmefjord<p>Hi,</p> <p>Are you&nbsp;planning to use the nRF52840 as an external BLE chip for another MCU, or are you asking about the communication between CPU and Radio in the system.on-chip (SoC)? You do not need external MCU with nRF52840, it have CPU that is shared between application and radio operations.</p> <ol> <li>See&nbsp;<a title="AHB multilayer" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/ahbmultilayer.html?cp=2_0_0_3_6">AHB multilayer</a>&nbsp;and&nbsp;<a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/radio.html?cp=2_0_0_5_19">RADIO</a>&nbsp;documentation.</li> <li>This will depend on type of BLE activity and how much data is transferred. See softdevice documentation&nbsp;<a title="Bluetooth Low Energy processor usage patterns" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s140.sds/dita/softdevices/s130/processor_avail_interrupt_latency/ble_usage_patterns.html?cp=2_3_2_0_15_2_2">Bluetooth Low Energy processor usage patterns</a>.</li> <li>Halting the CPU will cause the Softdevice to assert. This can be worked around by using <a href="https://github.com/NordicPlayground/j-link-monitoring-mode-debugging">J-Link Monitor Mode debugging</a> feature.</li> <li>Yes, <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk/keydef/PLUGINS_ROOT/com.nordic.infocenter.sdk5.v15.2.0/index.html?cp=4_0_0">our SDK support IAR</a>. Please download the SDK and follow the <a title="Getting Started" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/nrf51_getting_started.html?cp=4_0_0_1">Getting Started</a> section.</li> <li>Yes, FreeRTOS is supported in our SDK. See&nbsp;<a title="RTOS support" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_rtos.html?cp=4_0_0_3_37">RTOS support</a>.</li> <li>No, but there is examples for most peripherals, features and BLE use-cases in the SDK.</li> <li>Yes, see&nbsp;<a title="BLE Peripheral" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/examples_ble_peripheral.html?cp=4_0_0_4_1_2">BLE Peripheral</a>&nbsp;and&nbsp;<a title="BLE Central" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/examples_ble_central.html?cp=4_0_0_4_1_0">BLE Central</a>&nbsp;examples in the SDK.</li> </ol> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>