The WSN Node example illustrates how to create a Wireless Sensor Network Node device which sends packets to a concentrator. This example is meant to be used together with the WSN Concentrator example to form a one- to-many network where the nodes send messages to the concentrator.
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.
Board_LED0- Toggled when the a packet is sentBoard_ADCCHANNEL_A0- Used to measure the Analog Light Sensor by the SCE taskBoard_BUTTON0- Selects fast report or slow report mode. In slow report mode the sensor data is sent 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.
Please refer to the development board's specific "Settings and Resources" section in the Getting Started Guide (http://www.ti.com/lit/SPRUHU7C). For convenience, a short summary is also shown below.
| Development board | Notes |
|---|---|
| CC1310DK 7x7 | |
| CC2650DK 7x7 | |
| CC2650LAUNCHXL | Boosterpack 430BOOST-SHARP96 needed for LCD |
- Run the example. On another board run the WSN Concentrator example. This node should show up on the LCD of the Concentrator.
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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.
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On initialisation 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.
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The NodeTask waits to be woken up by the SCE. When it wakes up it toggles
Board_LED1and sends the new ADC value to the NodeRadioTask. -
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.
Note for IAR users: When using the CC1310DK, the TI XDS110v3 USB Emulator must be selected. For the CC1310_LAUNCHXL, select TI XDS110 Emulator. In both cases, select the cJTAG interface.
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For GNU and IAR users, please read the following website for details about enabling semi-hosting in order to view console output.
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For more information on the EasyLink API and usage refer to SimpleLink-EasyLink.