Leadtek LR9023(MTK MT3329) User manual

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LR9023 User’s Manual V1.0

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Version History

Date Version Author Comments

01/08/2009 1.0 J. Lee Initial version

ALL INFORMATION CONTAINED HEREIN IS THE SOLE PROPERTY OF LEADTEK

RESEARCH AND CANNOT BE DISSEMINATED WITHOUT THE EXPRESS WRITTEN CONSENT

OF LEADTEK RESEARCH.

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LR9023 User’s Manual V1.0

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Table of Contents

1.0 .............................................................I

Chapter 1 Overview ..............................................1

Outline..................................................................................................................................2

Functional Kit.................................................................................................................2

Assemble F1 Board on EVK.........................................................................................3

Chapter 2 Installation ..........................................6

Installation......................................................................................................................6

Installer 1 (for EVK) ................................................................................................7

Installer 2 (for LR9023F1) ....................................................................................9

Chapter 3 Getting Started ......................................10

Starting G-Viewer........................................................................................................10

1. How to connect to the device and view the satellite messages10

2. How to configure the output message ................................................... 12

3. How to change the settings by making commands.............................. 14

4. How to save the output messages............................................................15

Chapter 4 Troubleshooting ......................................16

Serial Port troubleshooting................................................................................16

Chapter 5 Appendix A ...........................................17

Glossary..............................................................................................................................17

Chapter 6 Appendix B ...........................................18

LR9023 reference design ........................................18

LR9023 reference bill of materials .............................19

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Chapter 1 Overview

Before you start to use the G-Viewer, please prepare following

contents:

‧ Install compatible GPS USB driver on PC that you connect to the

GPS 9500 EVK (Evaluation kit) board to demonstrate performance

of Leadtek GPS module.

‧ Pair compatible GPS modules with EVK board.

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Outline

■ Evaluation kit board

The EVK board descriptions the following parts:

F1 Board Connector ①

USB to UART Port ②

Boot Select Button ③

Reset Factory Default Button ④

RED is for GPS data output status ⑤

Green is for power status ⑥

Functional Kit

LED Status Show power and data transmitting status. The green is for

power status and the red is for GPS data output stats.

Reset Reset GPS module force cold start.

Boot Select Push reset button once while hold down boot select button

and make GPS module to execute download mode to update

firmware. This method can only be performed when GPS

hardware support the boot select and reset switch.

Table 1-1 describes the Function Kit

①

②

③

④

⑤

⑥

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Assemble F1 Board on EVK

The install instruction diagram as following parts:

■ Step 1

Module: LR9023 (for example)

■ Step 2

Check LR9023F1

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■ Step 3

First combine with module and LR9023F1. The pin one on the module

is look like a little black point, you must connect to the pin

one on the LR9023F1 board correctly. The pin one on the LR9023F1

board is look like a little white circle on the corner.

(see the red circle on the figure below)

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■ Step 4

Connect the LR9023F1 board to EVK board and PC.

Or connect LR9023F1 board directly to the PC. To avoid the noise

from USB, it is highly recommended to use a USB extending cable. Please

install the USB driver in the CD-ROM or go to Leadtek website for

downloading.

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Chapter 2 Installation

G-Viewer utility provide user to monitor the NMEA message information

and more differential GPS system.

Menu ①

The main page ②

Development Data Window ③

①

②

③

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Installation

<Note>

Minimum hardware requirements are Pentium 4 CPU with at least 128MB RAM,

one or more available serial COM port interface.

This installation requires Windows NT/2000/XP/Vista. This application

will not install correctly on Win95.

Installer 1 (for EVK)

<Note>

Please do not plug in USB serial cable before installation of USB driver.

■ Step 1

Insert the software CD in your CD-ROM drive. The autorun program

will display setup screen.

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■ Step 2

Please click on the USB Driver button for installation. Click one

of the items you want to operate.

■ Step 3

Install the USB driver by click on the menu Install button.

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■ Step 4

Perform operation system reboot and insert the USB serial cable.

G-Viewer should be able to detect new serial port for the USB serial

cable.

Installer 2 (for LR9023F1)

<Note>

Please do not plug in USB serial cable before installation of USB driver.

■ Step 1

Please download the USB driver(MT3329_USB_Installer.zip) from the

LR9023 web page and start the installation. You will see the window

below on your screen.

■ Step 2

After the installation is done, the window will be shown as below.

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Chapter 3 Getting Started

Starting G-Viewer

1. How to connect to the device and view the satellite messages

■ Step 1

When an USB or Bluetooth port is detected, the COM port information

will pop up. Please select the COM port and choose the baud rate

you need and press “Connect” to connect to the device and start

to receive the satellite information. You can also choose “ScanPort”

to search for the available COM ports.

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■ Step 2

While connected, you can view the satellite information if the

output process is successful. The bar chart shows the signal level

and the serial numbers of the related satellites. You can press

“Cold Start”, “Warm Start” and “Hot Start” to reacquire the signals

if necessary.

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2. How to configure the output message

In the page of “Setting”, you can select the NMEA messages and the respective

periods, and then press “Set” to change the original setting. You can

also press “Set Default” to go back to the original setting.

Reset Mode Description

Hot Start

Restart by using the values stored in the internal memory of

the GPS receiver.

Warm Start Clear all initialization data in the GPS receiver and

subsequently reloads the data the is currently displayed in

the same initialize position and time.

Cold Start Clear all data that is currently stored in the internal memory

of the GPS receiver including position, almanac, ephemeris,

time and clock drift.

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NMEA Configuration

Table 2-1 lists NMEA messages provided in sections.

Option Description

GGA Time, Position, and fix type data.

GLL Latitude, longitude, UTC time of position fix and status.

GSA GPS receiver operating mode, satellites used in the position

solution, and DOP values.

GSV The number of GPS satellites in view satellite ID numbers,

elevation, azimuth, and SNR values.

RMC Time, date, position, course and speed data.

VTG Course and speed information relative to the ground.

Period

Value between 1 and 255.

The input value means the interval of each message, and the

unit is second.

Baud Rate

Generally, 9600 for NMEA Protocol.

For USB interface, Baud rate is irrelevant.(You can receive

the data with any baud rate)

For UART interface, please refer to Leadtek NMEA Protocol

Manual for MTK.

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3. How to change the settings by making commands

Please be noted that the GPS LED status on the F1 board will remain the

same as what it is when you make PMTK commands. For example, if the light

is on when you are making commands, it will remain on until your next

command.

NMEA Input Message

Table 3-1 shows the transport message parameters and here below is the

example to make a command. After you key in the command and press “Send”,

the command will promptly take effect.

Option Description

NMEA Command

NMEA input messages allow you to control the Evaluation unit

in NMEA protocol mode. The Evaluation unit may input NMEA mode

by sending the MTK protocol message.

Start Sequence Payload Checksum End Sequence

Transport Message

$PMTK<MID> DATA *CKSUM <CR><LF>

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4. How to save the output messages

When the device and the computer are successfully connected, please press

the icon circumscribed in red as below. Select the path and the place

to save your output messages.

Development Data Window

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Chapter 4 Troubleshooting

Serial Port troubleshooting

Serial Port troubleshooting – the most common problem encountered

when having problems with any software of this type is an error in

the configuration of the serial port. The NMEA 0183 standard for GPS

receivers baud rate of 9600, 8 data bits, no parity and 1 stop bit.

Make sure that the NMEA strings being received and displayed in the

Development Data window shown as above are readable. If the data is

not readable, most likely an error in your baud rate selection. Verify

the baud rate selection in the Data Source Settings.

<Note>

Select data baud rate as 9600 to ensure that data overrun does not occur.

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Chapter 5 Appendix A

Glossary

Azimuth The Horizontal angle of the observer’s bearing in surveying,

measured clockwise from a referent direction, as from north, or

from a referent celestial body, usually Polaris.

C/NO Carrier-to-Noise density ratio

DOP Dilution of Precision

Elevation The height of GPS antenna above the reference ellipsoid. The

elevation angle of GPS satellite above the horizontal horizon or

user defined mask.

PRN Pseudorandom Noise Number. The identity of the GPS satellites as

determined by a GPS receiver. Since all GPS satellites must transmit

on the same frequency, they are distinguished by their pseudorandom

noise codes.

RTCM Radio Technical Commission of Maritime Services. Also commonly

used as a reference o the standard format that DGPS corrections

data is distribute in RTCM recommended standard for differential

Navstar GPS service. SiRF star receiver supports that latest

version 2.1 of this standard.

SA Selective Availability. The method used by the DOD to control access

to the full accuracy achievable with the C/A code.

SNR Signal-to-Noise Ratio, often expressed in decibels.

SV Satellite vehicle.

UTC Universal Time Coordinated. This time system uses the second

defined true angular rotation of the Earth measured as if the Earth

rotaed about its Conventional terrestrial Pole. However, UTC is

adjusted only in increments of on second. The time zone of UTC

is that of Greenwich Mean Time (GMT)

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Chapter 6 Appendix B

LR9023 reference design

Leadtek LR9023(MTK MT3329) User manual

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