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23 April 2017
Embedded Bluetooth Stack
Dean Camera
Supervisor: Prof. John Devlin
Co-Supervisor: Robert Ross
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23 April 2017
Project Aims
Develop a functional Bluetooth stack
Designed for embedded use
Focus on low resource usage
Memory Requirements
CPU Requirements
No RTOS requirements
Design and build a functional hardware prototype to demonstrate the stack
Embedded Bluetooth Stack Page 2
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23 April 2017
Bluetooth Stack
Embedded Bluetooth Stack Page 3
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4. Bluetooth Stack Layers
SDP
Other Services
High level abstracted services
Logical Link Control
and Adaption Protocol
Logical channel management within a device connection
Host Controller Interface
Baseband management including physical connections between devices
Physical Transport
Sends/Receives packets to and from the Bluetooth Controller
USB
Serial
Embedded Bluetooth Stack Page 4

5. Completed Bluetooth Stack
Supports multiple concurrent connections
Multiple logical channels per connection
L2CAP reliability through a dedicated internal queue
API for integration into user applications
Embedded Bluetooth Stack Page 5

6. Embedded Bluetooth Stack Page 6
Bluetooth Services
RF Communication (RFCOMM)
Server role only
Provides wireless serial port functionality
Human Interface Device (HID)
Very basic server implementation
Compatible with specific devices only
Embedded Bluetooth Stack Page 6

7. Completed Services (Cont)
Service Discovery Protocol (SDP)
Server implementation only
Allows for dynamic registration of other services
Embedded Bluetooth Stack Page 7

8. Demonstration Hardware
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23 April 2017
Demonstration Hardware
Embedded Bluetooth Stack Page 8
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9. Embedded Bluetooth Stack Page 9
Hardware Overview
Small battery operated “ExplorerBot” robot
Allow for user control over Bluetooth connections
Onboard sensors with wireless streaming
Embedded Bluetooth Stack Page 9

10. Hardware Overview (Cont)
Atmel Inertial One and Pressure One sensor boards
Accelerometer
Gyroscope
Magnetometer
Temperature Sensor
Pressure Sensor
Level Converted I2C Bus
Embedded Bluetooth Stack Page 10

11. Embedded Bluetooth Stack Page 11
Completed Prototype
Embedded Bluetooth Stack Page 11

12. Firmware Block Diagram
Embedded Bluetooth Stack Page 12

13. Tested Bluetooth Devices
Motors, horn and headlights controllable
Sony Ericson z550i Mobile Phone
Sony Playstation 3 Controller
Nintendo Wii Controller
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14. Embedded Bluetooth Stack Page 14
Host Application
Basic sensor streaming host application
Written in C#
Graphs sensor data from the robot in real time
Embedded Bluetooth Stack Page 14

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23 April 2017
More Information
All project materials (source code, thesis, presentations, photos) uploaded online
Source code released under a MIT license
Full SVN revision history available
Embedded Bluetooth Stack Page 15
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23 April 2017
Thank You
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