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BLE5-Stack Long Range Central

Functional Overview

This example page will demonstrate the Bluetooth™ 5 Long Range capabilities of the Texas Instruments CC2640R2 SDK's BLE5-Stack.

This project is a modified Simple Central sample application from the BLE5-Stack component of the SDK.

This list contains the changes from the standard Simple Central example:

  • Removed the Simple GATT Profile
  • Added Support for a custom profile called Throughput Profile
  • Added Support for a custom profile called Temperature Profile

The Long Range Central only connects to peripherals that support the Throughput and Temperature profiles. To connect, the Central and Peripheral devices must be within the 1M PHY range. Once connected, the Central takes the follow steps:

  1. The discovery of the Throughput and Temperature Characteristics
  2. A GATT write to the Throughput PHY Characteristic to have the peripheral start negotiation the use of the Coded PHY (S8).
  3. Update the LED status indicating that the Central is connected to the Peripheral.
  4. Enabling GATT Notifications for the Temperature Data Characteristic

Project Hardware

  • 1 CC2650R2 Launchpad
  • 1 UART Terminal on PC

LED Output

  • RED: Solid RED indicates the device is not connected to a peripheral.
  • GREEN: Blinking GREEN indicates the device is connected to a peripheral in using the Long Range Coded PHY (S8).

Two Button Menu

The Two Button Menu system is designed to utilize the two push buttons available on the CC2640R2 Launchpad. The left button (BTN1) is always used to cycle between options. The right button (BTN2) is used to activate the selected action or item.

The Two Button Menu is set up by default to utilize the back channel UART present on the Launchpad as it's display.

Running the Demo

  1. Compile and load the projects:

    • First build and load ble5_longrange_central_cc2640r2lp_stack
    • Next build and load ble5_longrange_central_cc2640r2lp_app

  2. Connect to the Launchpad via PuTTY (or other serial console emulator). For instructions on connecting via PuTTY, please see our FAQ page.

  3. After connecting to PuTTY, you will be presented with the Two Button Menu system prompting you for actions. Select 'Scan/Connect Menu' by pressing the right button (BTN2).

    *Texas Instruments Bluetooth 5 Long Range Demo

+Scan/Connect Menu >

This Device's BDADDR : 0x<BDADDR>

  4. Then select "Scan For Devices" menu option by pressing the right button (BTN2).

    *Scan/Connect Menu
< Next Item
  Scan for Devices >
 +Upper Menu
This Device's BDADDR : 0x<BDADDR>

  5. After Scanning is performed, choose the desired device to connect to by pressing the right button (BTN2). Note: Only peripherals that support both the Throughput and Temperature profiles will be listed.

    *Scan/Connect Menu
< Next Item
  Select Next Device >
  Connect to Selected Device
  Scan for Devices
 +Upper Menu
2 Devices Found

Scanned Device 1
0x<BDADDR>

  6. Press the left button (BTN1) to move to the next action, "Connect to Selected Device". Then use the right button (BTN2) to begin connecting to the displayed device.

    After a connection is successful, you will be presented with new menu options:

    *Texas Instruments Bluetooth 5 Long Range Demo
< Next Item
  Toggle RSSI Readings
  Disconnect
PHY Update Complete

    As well as connection details in the UART display:

    Peer Device : 0x<BDADDR>
Current PHY: Coded:S8
RSSI -dBm: 65
Object Temperature: 22 (C)