EverMore EB-X315 Manuel utilisateur

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

EB-X315

GPS Receiver Module

User’s Guide

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

Manual Revision History

Revision Date Update Summary

Issue A October 2002 Initial release (Updated)

Not to be reproduced in whole or part for any purpose without written permission of EverMore

Technology Inc. Information provided by EverMore Technology Inc. is believed to be accurate

and reliable. However, no responsibility is assumed by EverMore Technology Inc. for its use.

EverMore Technology Inc. reserves the right to change specification at any time without notice.

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

Table of Contents

1. INTRODUCTION..................................................................................................... 5

1.1. OVERVIEW ........................................................................................................ 5

1.2. FEATURES.......................................................................................................... 8

1.3. EVERMORE EB-X315 EVA L U AT I O N KIT ................................................... 9

1.4. RECEIVER MODULE OPERATION .................................................................. 9

2. HARDWARE INTERFACE................................................................................... 11

2.1. EB-X315 PICTURE........................................................................................ 11

2.2. DEVELOPMENT PLATFORM PICTURE ......................................................... 12

2.3. MECHANICAL DIMENSIONS......................................................................... 13

2.4. RF CONNECTOR............................................................................................. 13

2.5. INTERFACE CONNECTOR.............................................................................. 14

2.6. INTERFACE CONNECTOR PIN ASSIGNMENT.............................................. 15

2.7. PIO CONNECTOR PIN ASSIGNMENT .......................................................... 16

2.8. ONE-PULSE-PER-SECOND OUTPUT ........................................................... 17

3. SOFTWARE INTERFACE .................................................................................... 18

3.1. HOW TO DEVELOP AN EB-X315 USER PROGRAM ................................... 18

3.2. USER API........................................................................................................ 19

3.3. EB-X315 RESOURCES ................................................................................. 20

3.4. HOW TO DOWNLOAD USER PROGRAMS ..................................................... 21

3.5. HOW TO DEBUG USER PROGRAM ................................................................ 23

3.6. TROUBLESHOOTING ...................................................................................... 24

4. GPS OUTPUT MESSAGE..................................................................................... 25

4.1. NMEA OUTPUT MESSAGE SPECIFICATION ............................................. 25

4.1.1. GGA – Global Positioning System Fix Data .............................................. 26

4.1.2. GLL – Geographic Position – Latitude / Longitude ................................... 27

4.1.3. GSA – GNSS DOP and Active Satellites..................................................... 28

4.1.4. GSV – GNSS Satellites in View ................................................................... 29

4.1.5. RMC – Recommended Minimum Specific GNSS Data ............................... 30

4.1.6. VTG – Course Over Ground and Ground Speed ........................................ 31

4.2. EVERMORE BINARY MESSAGE SPECIFICATION .................................. 32

4.2.1. EverMore Binary Input Message 0x80: Initialization ................................ 33

4.2.2. EverMore Binary Input Message 0x81: Data Logging............................... 34

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

4.2.3. EverMore Binary Input Message 0x86: Set Elevation Mask ...................... 34

4.2.4. EverMore Binary Input Message 0x87: Set DOP Mask ............................. 34

4.2.5. EverMore Binary Input Message 0x89: Set Operating Mode..................... 35

4.2.6. EverMore Binary Output Message 0x02: Navigation Data........................ 36

4.2.7. EverMore Binary Output Message 0x04: DOP Data ................................. 37

4.2.8. EverMore Binary Output Message 0x06: Channel Status .......................... 38

4.2.9. EverMore Binary Output Message 0x08: Measurement Data.................... 39

APPENDIX A. SYSTEM CONTROL PORT ADDRESS....................................... 40

A.1. REGISTER INPUT / OUTPUT FUNCTIONS................................................... 40

A.2. TIMER CONTROL .......................................................................................... 40

A.3. TIMER OUTPUT ............................................................................................. 44

APPENDIX B. SUPPORTED DATUM LIST .......................................................... 45

B.1. ELLIPSOID DESCRIPTION TABLE................................................... 52

APPENDIX C. DEFAULT VALUES......................................................................... 53

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

1. Introduction

1.1. Overview

The EB-X315 GPS Module is intended for use in a wide range of applications where EB-X315

applies. The module simultaneously tracks up to twelve satellites, provides accurate satellite

positioning data with fast time-to-first-fix (TTFF) and low power consumption. In addition, with

all of the features of EBX-315, It has a very efficient dual-tasking kernel, which allows

applications to reside on the module and to control up to 9 on-board Input/Output pins. This

micro kernel provides high performance and maximum flexibility for a wide range of

applications including mobile asset tracking, in-vehicle automotive guidance, location sensing,

telematics and so on. The highly integrated receiver achieves high performance, minimizes

board size and power consumption requirements. The EB-X315 is designed to withstand harsh

operating environments; however, it should be used inside an enclosure as a part of the

application product designed by the system integrator.

As latest development in GPS, many applications have been introduced into the area where

the position of the source, receivers, for example, is no more the only one essential factor to

dominate the GPS market. They have been implicitly embedded into many modern information

products. However, this source still dominates the overall cost of the end products. The

majority of the cost is from the development:

1. Develop extra application control board separated from GPS module. Or

2. Link application code with GPS Baseband object code.

Although the first solution is purely independently from GPS kernel, (application developers do

not need to have GPS knowledge), an extra board will result in a bigger end product

dimension and also consume more battery power. On the contrary, the second solution makes

the application much complicated to develop. Developers might somehow need to learn the

system architecture of the original GPS kernel. In some situations, one might need to pay extra

money to get technical support or service from the GPS module provider, or they would break

down the GPS kernel.

To ease the problems the GPS end-product developers might meet, EverMore introduces the

EB-X315 engine board combined with an advanced GPS kernel and up to 10 control IO pins.

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

By using EB-X315, developers can really concentrate on their GPS application software

design. EB-X315 enables developers to download their own GPS-aware program into the

80186-based platform and result in cost-efficient in whole user package. Users will be able to

fully use the power of 80186 without adding extra CPU to access various IO applications. The

EB-X315 package provides about 9 PIO pins for developers to control external devices and

retrieve signals from outside environment while getting position information from GPS kernel.

In addition, because all of the functionalities are within the same board, there is no need to

build up another control board.

The principle idea is that developers can develop their 80186 code with most of off-the-shelf

compilers, especially the code used in 8051 series, without any hassle on linking or

communicating with GPS kernel. Users simply recompile their 8051 programs with option

80186, (plus a little modification) and download into EB-X315 user code area. EB-X315

system will be able to locate and run user system automatically.

Figure 1. Architecture & Application Concept

EB X315 board

PIO

User

Program

GPS

Kernel

Download program or debugging

COM1

COM 2

VCOM

APIs

LCD

Wireless

Modem

External

Device

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

Application developers will find the beauty of EB-X315 is that the interface between user

program and GPS is very clear and simple. Without any worry on breaking down GPS,

developers can focus on their applications as long as using EB-X315.

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

1.2. Features

The EB-X315 GPS module offers following features:

For user program:

z Downloadable 96 K bytes User Flash memory and 48 K bytes SRAM

z 9 PIOs and up to 2 external interrupts

z Two on-board timers

z Real time clock

z Programmable on-board application program space

z Two on-board serial ports

For GPS Receiver

z 12 parallel tracking channels

z Fast TTFF and low power consumption

z Compact design suitable for applications requiring small space

z Differential correction using real-time RTCM SC-104 data

z On-board rechargeable battery sustained real-time clock and memory for fast satellite

reacquisition during power-up

z High accuracy one-pulse-per-second output

z Upgradeable firmware using flash-based program memory

z Supports NMEA-0183 protocol

z Full navigation accuracy achievable with Standard Positioning Service

z Optimized for navigation in urban-canyon environments

z Automatic cold start with no user initialization required

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

1.3. EverMore EB-X315 Evaluation Kit

- 33 MHz EverMore GPS Engine Board (EB-X315)

- Power board with two COM ports

- Power Adaptor (Voltage 9V, Amp 1.5A)

- PC Download program

- EB-X315 User Guide

- User API for C Language

- C Development Guide

- Sample object Code for Turbo C and Microsoft C 8.0

- Release Note

1.4. Receiver Module Operation

Upon power up, EB-X315 micro kernel checks pin 6 to determine operation mode. If this pin is

logical high (default), the dual-tasking kernel will be launched. If this pin is logical low, only

GPS kernel is activated. This mode is good for the situation when user task causes CPU

exception. When dual-tasking kernel is enabled, user task is working in the way time-sharing

with GPS kernel.

After initial GPS self-test has completed, the EB-X315 will begin satellite acquisition and

tracking process. Under normal open-sky condition, position-fix can be achieved within

approximately 45 seconds (within 15 seconds if valid ephemeris data is already collected from

recent use). After receiver position has been calculated, valid position, velocity and time

information are transmitted through the on board serial interface.

The receiver uses the latest stored position, satellite data, and current RTC time to achieve

rapid GPS signal acquisition and fast TTFF. If the receiver is transported over a large distance

across the globe, cold-start automatic-locate sequence is invoked. The first position fix may

take up to five minutes searching the sky for the GPS signal. The acquisition performance can

be improved significantly if the host initializes the receiver with a rough estimate of time and

user position.

EverMore Technology Inc.

2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C. http://www.emt.com.tw

As soon as GPS signal is acquired and tracked, the EB-X315 will transmit valid navigation

information through its serial interface. The default serial port is COM1, however, user task can

redirect this port to Virtual port (VCOM) from which user task can get access the navigation

data. The navigation data contains following information:

z Receiver position in latitude, longitude, and altitude

z Receiver velocity

z Time

z DOP error-magnification factor

z GPS signal tracking status

The EB-X315 will perform 3D navigation when four or more satellites are tracked. When three

or fewer satellites are tracked, altitude-hold is enabled using the last computed altitude and 2D

navigation mode is entered.

With signal blockage or rising and setting of the satellites, where a change in satellite

constellation used for position fix occurred, large position error may result. The EB-X315

incorporates a proprietary algorithm to compensate the effect of satellite constellation change,

and maintains an accurate smooth estimate of the receiver’s position, velocity, and heading.

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