Bluetooth: Peripheral Running Speed and Cadence Service (RSCS)

The peripheral RSCS sample demonstrates how to use the Running Speed and Cadence Service (RSCS).

Requirements

The sample supports the following development kits:

Hardware platforms

PCA

Board name

Board target

nRF54L15 DK

PCA10156

nrf54l15dk

nrf54l15dk/nrf54l15/cpuapp

nRF54H20 DK

PCA10175

nrf54h20dk

nrf54h20dk/nrf54h20/cpuapp

nRF5340 DK

PCA10095

nrf5340dk

nrf5340dk/nrf5340/cpuapp/ns nrf5340dk/nrf5340/cpuapp

nRF52 DK

PCA10040

nrf52dk

nrf52dk/nrf52832

nRF52840 DK

PCA10056

nrf52840dk

nrf52840dk/nrf52840

nRF52833 DK

PCA10100

nrf52833dk

nrf52833dk/nrf52833

When built for a board target with the */ns variant, the sample is configured to compile and run as a non-secure application with Cortex-M Security Extensions enabled. Therefore, it automatically includes Trusted Firmware-M that prepares the required peripherals and secure services to be available for the application.

The sample also requires a phone or tablet running a compatible application, for example nRF Connect for Mobile or nRF Toolbox.

Overview

This sample demonstrates the use of Running Speed and Cadence Service. It simulates a sensor and sends measurements to the connected device, such as a phone or a tablet.

The mobile application on the device can configure sensor parameters using the SC Control Point characteristic.

User interface

LED 1:

Blinks, toggling on/off every second, when the main loop is running and the device is advertising.

LED 2:

Lit when connected.

Building and running

This sample can be found under samples/bluetooth/peripheral_rscs in the nRF Connect SDK folder structure.

When built as firmware image for a board target with the */ns variant, 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, follow the instructions in Building an application for your preferred building environment. See also Programming an application for programming steps and Testing and optimization for general information about testing and debugging in the nRF Connect SDK.

Note

When building repository applications in the SDK repositories, building with sysbuild is enabled by default. If you work with out-of-tree freestanding applications, you need to manually pass the --sysbuild parameter to every build command or configure west to always use it.

Note

Programming the nRF54H20 SoC can sometimes fail due to conflicts in the resource configuration. This can happen if, for example, an application programmed to the nRF54H20 SoC configured the UICRs for one or more cores in a way that is incompatible with the configuration required by the application you are trying to program on the SoC.

To fix this error and erase the UICR for the application core, run the following command:

nrfutil device recover --core Application

If your sample also uses the radio core, you must also erase the UICRs for the radio core. To erase the UICR for the radio core, run the following command:

nrfutil device recover --core Network

For more information on the command, run:

nrfutil device recover --help

You can then run west flash to program your application.

Testing

This testing procedure assumes that you are using nRF Connect for Mobile. After programming the sample to your development kit, test it by performing the following steps:

  1. Power on your development kit.

  2. Connect to the device through nRF Connect for Mobile (the device is advertising as “Nordic_RSCS”).

  3. Observe that the services of the connected device are shown.

  4. In Running Speed and Cadence Service, tap the Notify button for the “RSC Measurement” characteristic.

  5. Observe that notifications with the measurement values are received.

  6. In RSC Feature, tap the Read button to get the supported features.

  7. In Sensor Location, tap the Read button to read the location of the sensor.

  8. In SC Control Point, tap the Indicate button to control the sensor.

  9. The following Op Codes (with data if required) can be written into the SC Control Point:

    • 01 xx xx xx xx to set the Total Distance Value to the entered value in meters. (if the server supports the Total Distance Measurement feature).

    • 02 to start the sensor calibration process (if the server supports the Sensor Calibration feature).

    • 03 xx to update the sensor location (if the server supports the Multiple Sensor Locations feature).

    • 04 to get a list of supported localizations (if the server supports the Multiple Sensor Locations feature).

  10. The answer consists of the following fields:

    • 10 Response Code.

    • xx Required Op Code.

    • xx Status: 01 Success, 02 Op Code not supported, 03 Invalid Operand, 04 Operation Failed.

    • data Optional, response data.

Dependencies

This sample uses the following nRF Connect SDK libraries:

In addition, it uses the following Zephyr libraries:

  • include/zephyr/types.h

  • lib/libc/minimal/include/errno.h

  • include/sys/printk.h

  • include/random/random.h

  • API:

    • include/bluetooth/bluetooth.h

    • include/bluetooth/conn.h

    • include/bluetooth/uuid.h

    • include/bluetooth/gatt.h

The sample also uses the following secure firmware component: