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Time-of-Flight API
User Guide
JN-UG-3068
Revision 1.0
6-Oct-2009
Jennic
Time-of-Flight API
User Guide
2 © Jennic 2009 JN-UG-3068 v1.0
Time-of-Flight API
User Guide
Jenni
c
Contents
About this Manual 5
Organisation 5
Conventions 5
Acronyms and Abbreviations 5
Related Documents 5
Feedback Address 6
1 Introduction 7
1.1 ToF Mechanism 7
1.2 ToF Data Transfers 8
2 Using the ToF API 9
2.1 Initialising the ToF API 9
2.2 Configuring the ToF API 9
2.3 Taking ToF Readings 10
2.4 Processing the ToF Data 11
2.5 Interpreting ToF Data 12
2.5.1 Time-of-Flight Data 12
2.5.2 Received Signal Strength Indication (RSSI) Data 13
2.5.3 Signal Quality Indication (SQI) Data 15
2.5.4 Timestamp Information 15
3 Location System Development 17
3.1 Finding Reference Nodes 17
3.1.1 IEEE 802.15.4 17
3.1.2 JenNet 17
3.1.3 6LoWPAN 17
3.1.4 ZigBee PRO 17
3.2 Performing Range Measurements 18
3.3 Packaging Results for Transmission 18
3.4 Configuring the Location System 18
4 ToF API Functions 19
vAppApiTofInit 20
bAppApiGetTof 21
s32AppApiTofGetCalloffset 22
vAppApiTofSetCalloffset 23
5 ToF API Type Definitions 25
5.1 tsAppApiTof_Data Structure 25
5.2 PR_TOF_APPCALLBACK 25
5.3 eTofReturn Enumerated Type 26
JN-UG-3068 v1.0 © Jennic 2009 3
Jennic
Time-of-Flight API
User Guide
4 © Jennic 2009 JN-UG-3068 v1.0
Time-of-Flight API
User Guide
Jenni
c
About this Manual
This manual introduces the Time-of-Flight (ToF) mechanism of the Jennic JN5148
wireless microcontroller and describes the supplied ToF Application Programming
Interface (API) which allows access to this functionality.
Organisation
This manual consists of five chapters, as follows:
•
Chapter 1 introduces the JN5148 Time-of-Flight (ToF) mechanism.
•
Chapter 2 outlines the usage of the ToF API.
•
Chapter 3 deals with design considerations of developing a location system.
• Chapter 4 details the ToF API functions.
•
Chapter 5 details the data structures used by the ToF API.
Conventions
Files, folders, functions and parameter types are represented in bold type.
Function parameters are represented in italics type.
Code fragments are represented in the
Courier typeface.
Acronyms and Abbreviations
API Application Programming Interface
RSSI Received Signal Strength Indication
SQI Signal Quality Indication
ToF Time of Flight
CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
Related Documents
[R1] Jennic Time of Flight Ranging Demo [JN-AN-1143]
JN-UG-3068 v1.0 © Jennic 2009 5
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