Wi-Fi: Shutdown
The Shutdown sample demonstrates how to put the Nordic Semiconductor’s Wi-Fi® chipset in shutdown mode. This also demonstrates how to achieve the lowest possible power consumption in the nRF5340 SoC when Wi-Fi is enabled but not in use.
Requirements
The sample supports the following development kits:
Hardware platforms |
PCA |
Board name |
Build target |
Shields |
|---|---|---|---|---|
PCA10143 |
|
|||
PCA10095 |
|
|
||
PCA10056 |
|
|
Overview
The sample can demonstrate Wi-Fi shutdown and achieve the lowest possible power consumption in the nRF5340 SoC. The sample:
Initializes the Wi-Fi driver.
Scans for available Wi-Fi networks to verify that the Wi-Fi driver is operational.
Shuts down the Wi-Fi driver.
Puts the nRF5340 SoC in the lowest possible power consumption mode.
User Interface
- Button 1:
Wakes up the nRF5340 SoC and initializes the Wi-Fi chipset. The sample then scans for available Wi-Fi networks to verify that the Wi-Fi driver is operational.
- Button 2:
Shuts down the Wi-Fi driver. The nRF5340 SoC is put into the lowest possible power consumption mode.
Building and running
This sample can be found under samples/wifi/shutdown in the nRF Connect SDK folder structure.
When built as firmware image for the _ns build target, the sample has Cortex-M Security Extensions (CMSE) enabled and separates the firmware between Non-Secure Processing Environment (NSPE) and Secure Processing Environment (SPE).
Because of this, it automatically includes the Trusted Firmware-M (TF-M).
To read more about CMSE, see Processing environments.
To build the sample with Visual Studio Code, follow the steps listed on the How to build an application page in the nRF Connect for VS Code extension documentation. See Building and programming an application for other building and programming scenarios and Testing and debugging an application for general information about testing and debugging in the nRF Connect SDK.
To build for the nRF7002 DK, use the nrf7002dk_nrf5340_cpuapp build target.
The following is an example of the CLI command to demonstrate Wi-Fi shutdown:
west build -b nrf7002dk_nrf5340_cpuapp
Testing
After programming the sample to your development kit, complete the following steps to test it:
Connect the kit to the computer using a USB cable. The kit is assigned a COM port (Windows) or ttyACM device (Linux), which is visible in the Device Manager.
Connect to the kit with a terminal emulator (for example, PuTTY). See How to connect with PuTTY for the required settings.
The sample shows the following output:
*** Booting Zephyr OS build v3.3.99-ncs1-26-ge405279d2134 *** [00:00:00.440,460] <inf> wifi_nrf: Firmware (v1.2.8.1) booted successfully [00:00:00.638,397] <inf> scan: Starting nrf7002dk_nrf5340_cpuapp with CPU frequency: 64 MHz [00:00:00.642,608] <inf> scan: Scan requested Num | SSID (len) | Chan | RSSI | Security | BSSID 1 | abcdef 6 | 1 | -37 | WPA/WPA2 | aa:aa:aa:aa:aa:aa 2 | pqrst 5 | 1 | -65 | WPA/WPA2 | xx:xx:xx:xx:xx:xx 3 | AZBYCXD 7 | 1 | -41 | WPA/WPA2 | yy:yy:yy:yy:yy:yy [00:00:05.445,739] <inf> scan: Scan request done [00:00:05.452,423] <inf> scan: Interface down
Press Button 1 to wake up the nRF5340 SoC, initialize the Wi-Fi chipset, and scan for available Wi-Fi networks:
The sample shows the following output:
[00:00:29.141,357] <inf> wifi_nrf: Firmware (v1.2.8.1) booted successfully [00:00:29.269,165] <inf> scan: Interface up [00:00:29.272,521] <inf> scan: Scan requested Num | SSID (len) | Chan | RSSI | Security | BSSID 1 | abcdef 6 | 1 | -37 | WPA/WPA2 | aa:aa:aa:aa:aa:aa 2 | pqrst 5 | 1 | -65 | WPA/WPA2 | xx:xx:xx:xx:xx:xx 3 | AZBYCXD 7 | 1 | -41 | WPA/WPA2 | yy:yy:yy:yy:yy:yy [00:00:34.092,285] <inf> scan: Scan request done
Press Button 2 to shut down the Wi-Fi driver and put the nRF5340 SoC in lowest possible power consumption mode:
The sample shows the following output:
[00:00:48.313,354] <inf> scan : Interface down