rfWsnNodeBleAdv Example

Example Summary

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 acknowledgment 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_LED0 - Toggled when a packet is sent
• Board_ADCCHANNEL_A0 - Used to measure the Analog Light Sensor by the SCE task
• Board_PIN_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.

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>.

Board Specific Settings

1. The WSN examples use the custom physical mode by default, which sets the center frequency to:
   • 433.92 MHz for the CC1350-LAUNCHXL-433
   • 433.92 MHz for the CC1352P-4-LAUNCHXL
   • 2440 MHz on the CC2640R2-LAUNXHL
   • 868.0 MHz for other launchpads In order to change frequency, modify the smartrf_settings.c file. This can be done using the code export feature in Smart RF Studio, or directly in the file
2. On the CC1352P1 the high PA is enabled (high output power) for all Sub-1 GHz modes by default. The user must set USE_SUB1_HIGH_PA_SETTING to 0 in smartrf_settings.h and smartrf_settings_predefined.h, and rebuild the example, to disable the high PA and use the default PA
3. On the CC1352P-2 the high PA operation for Sub-1 GHz modes is not supported
4. On the CC1352P-4 the default PA is used for all Sub-1 GHz physical modes by default. The user must set USE_SUB1_HIGH_PA_SETTING to 1 in the smartrf_settings.h and smartrf_settings_predefined.h, and rebuild the example, to enable the high PA (high output power) CAUTION
   • This will change the center frequency for 2-GFSK to 490 MHz
     
   • The center frequency for SimpleLink long range (SLR) stays at 433.92 MHz, but the high output power violates the maximum power output requirement for this band
5. The CC2640R2 is setup to run all proprietary physical modes at a center frequency of 2440 MHz, at a data rate of 250 Kbps

Example Usage

• Run the example. On another board run the WSN Concentrator example. This node should show up on the serial console and LCD of the Concentrator. As the LED toggles the Node ADC Reading will update on the display.

Node ID: 0xa9
Node ADC Reading: 0010

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.

• 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.

• 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.

References

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