rfWsnNodeDm Example

Example Summary

The WSN Node example illustrates how to create a Dual Mode Wireless Sensor Network Node device which sends sensor data to a Sub-1GHz concentrator and also send out BLE beacons. The BLE beacons can be picked up by any BLE capable device. This example is meant to be used together with the WSN Dual Mode Concentrator example.

This examples showcases the use of several Tasks, Semaphores and Events to get sensor updates and send packets with acknowledgement from the concentrator. For the radio layer, this example uses the EasyLink API which provides an easy-to-use API for the most frequently used radio operations.

Peripherals Exercised

• Board_PIN_LED1 - Toggled when Sub1-GHz data is sent over the RF interface.

• Board_PIN_LED2 - Toggled when a BLE beacon is sent over the RF interface.

• Board_PIN_BUTTON0 - Selects fast report or slow report mode. In slow report mode the sensor data is sent at least every 5s or as fast as every 1s if there is a significant change in the ADC reading. In fast reporting mode the sensor data is sent every 1s regardless of the change in ADC value. The default is slow reporting mode.

• Board_PIN_BUTTON1 - Selects the BLE beacon type used;

• Manufacturer Specific (MS) + Eddystone URL. This is the default.
• MS
• Eddystone URL + TLM
• Eddystone UID + TLM

• None

Resources & Jumper Settings

If you’re using an IDE (such as CCS or IAR), please refer to Board.html in your project directory for resources used and board-specific jumper settings. Otherwise, you can find Board.html in the directory <SDK_INSTALL_DIR>/source/ti/boards/<BOARD>.

Fields left blank have no specific settings for this example.

Example Usage

Run the example. On another board run the WSN Dual Mode Concentrator example. This node should show up on the LCD/UART of the Concentrator. To create a sub-1GHz only device, without the capability to send BLE beacon, one can use the Wireless Sensor Network examples also.

Application Design Details

• This examples consists of two tasks, one application task and one radio protocol task. It also consists of an Sensor Controller Engine (SCE) task which samples the ADC once per second.

• On initialization the CM3 application sets the minimum report interval and the minimum change value which is used by the SCE task to wake up the CM3. The ADC task on the SCE checks the ADC value once per second. If the ADC value has changed by the minimum change amount since the last time it notified the CM3, it wakes it up again. If the change is less than the masked value, then it does not wake up the CM3 unless the minimum report interval time has expired.

• The NodeTask waits to be woken up by the SCE. When it wakes up it toggles Board_PIN_LED1 and sends the new ADC value to the NodeRadioTask. Then it sends out sensor data on the sub-1GHz RF interface and if configured to do so it will also send a BLE Beacon. The sensor data is; ADC value, battery level, time since last reboot, number of packets sent and the button state.

• The NodeRadioTask handles the radio protocol. This sets up the EasyLink API and uses it to send new ADC values to the concentrator. After each sent packet it waits for an ACK packet back. If it does not get one, then it retries three times. If it did not receive an ACK by then, then it gives up.

• RadioProtocol.h can also be used to change the PHY settings to be either the default IEEE 802.15.4g 50kbit, Long Range Mode or custom settings. In the case of custom settings, the smartrf_settings.c file is used. This can be changed either by exporting from Smart RF Studio or directly in the file.

For SensorTags there is a pin conflict, so either the DEVPACK-DEBUG or the DEVPACK-WATCH must be used and BOARD_DISPLAY_EXCLUDE_UART must be added to the global precompiler defines in order to use LCD.

For IAR users using any SensorTag(STK) Board, the XDS110 debugger must be selected with the 4-wire JTAG connection within your projects’ debugger configuration.

References

• For more information on the EasyLink API and usage refer to SimpleLink-EasyLink.