User guide

ManualsBrandsWavecom ManualsComputer equipmentCM52

C-GPS Overview and Usage

WM_DEV_C-GPS_APN_001-001

Author: Wavecom Support Consultant Date: 30 November 2006

APN Content Level

BASIC

INTERMEDIATE

ADVANCED

Confidentiality

Public

Private

TCP/IP

C-GPS

Reference Hardware

Yes

Open AT

SDK:

4.11

Internet

Bluetooth

Compiler

Used:

ADS

GCC

Reference Software

Yes

Software

Compatibility*

FW: 6.61

M2mpower

Plug-Ins:

MQTT M2MC

RTE:

* refer to software compatibility matrix section for more detail

Plug & Play: M1306B M2106B

Quik (CDMA): Q2438F Q2438R CM52

Q2400A Q2406A Q2406B Q2426B Q2501B

GR64 GS64 Q2686H

Q2687H

Quik (GSM):

Q24 Classic Q24 Plus Q24 Extended Q24 Auto

Wireless CPU

Compatibility

Wireless Microprocessor WMP100 WMP150

This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.

Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable.

Template: WM ACM F 007 level002 A P P L I C A T I O N N O T E A P P L I C A T I O N N O T E A P P L I C A T I O N N O T E

1 VERSION

Application Notes may be updated over their lifetime. To ensure

you design with the correct version, please check the application

notes page in the support section for www.wavecom.com.

2 INTRODUCTION

This APN (Application Note) is provided to Wavecom distributors

and clients to aid more rapid development of embedded

applications using the Wavecom portfolio of cellular solutions. To

request a new application note, contact your regional Wavecom

Product Marketing Manager.

3 APPLICATION NOTE DESCRIPTION

The acronym C-GPS stands for Companion GPS. Wavecom offers

its customers to ease the integration process of the GPS

functionalities with its GSM/GPRS Wireless CPU’s by offering a

ready-made library within the Open AT

environment. This library

allows driving a Companion GPS chipset. In this release, the GPS

solution is the Opus One from eRide, Inc. In order to facilitate

evaluation, testing and development, Wavecom makes available a

development kit which includes a C-GPS Daughter board. This

development kit can be ordered from Wavecom and Wavecom

distributors. The C-GPS chipset receives the GPS data, performs

the preliminary processing on the data and forwards the data to the

Wavecom Wireless CPU. The Open AT

application executed on

the Wavecom Wireless CPU receives this data and performs

processing based on the received data. The application need not

take care for low level interfacing with the GPS chipset as

Wavecom provides C-GPS library which performs the task of

managing the lower level details.

The C-GPS chipset uses one of the available UART to

send/receive data from the Wavecom Wireless CPU. Hence, to be

able to receive the C-GPS data from the C-GPS chipset, FCM flow

must be subscribed by the Open AT

application. As one of the

UART is internally used by the GPS chipset, it is not possible to

use this UART for any external application (like Terminal Emulator,

TMT or Hyperterminal). However, the UART which is not used by

GPS chipset can be used to interface with an external application.

This UART can be used to send/receive AT commands/responses

and also send the NMEA sentences.

Wavecom provides sample Open AT

applications which can be

used to provide guidelines to create customized application based

on the requirements.

4 HARDWARE CONFIGURATION

The C-GPS Daughter board is connected to the J201 connector of

the wireless CPU development board. This is shown in the picture

below:

The C-GPS Daughter board hence gets access to all the pins that

are provided on the J201 connector. Using these pins, the C-GPS

Daughter board is able to send/receive data to/from the Wavecom

Wireless CPU and hence able to interact with it.

4.1 Daughter Board

The C-GPS Daughter board has the following layout:

The Daughter Board has the following main components:

1. GPS Antenna Connector: This connector is used to

connect the external GPS antenna with the C-GPS

chipset. Please note that the connection should be made

using an active antenna.

2. UART1/UART2 configuration switch: This switch is

used to select whether UART1 or UART2 is used by the

C-GPS Daughter board to communicate with the

Wireless CPU. If the switch is set to “UART1”, then the

Rx and Tx pins of UART2 will be used by C-GPS

Daughter board to send/receive the GPS data. Hence,

this UART cannot be used by the external application

(like TE/Hyperterminal). The “UART1” in this case,

becomes the debug UART and can be used to

send/receive AT commands and receive the NMEA

messages. Similarly, if the configuration switch is set to

UART2, then the C-GPS Daughter board is configured to

Summary of content (7 pages)

PAGE 1
C-GPS Overview and Usage APN Content Level Software Compatibility* FW: BASIC 6.61 9 INTERMEDIATE Open AT® 4.
PAGE 2
C-GPS Overview and Usage WM_DEV_C-GPS_APN_001-001 In addition to the above interface characteristics of the C-GPS board, the C-GPS chipset requires the following signals to be driven: • NRST: This input signal is used to reset the C-GPS Daughter board. • GPS_ENABLE: This signal is used to enable the acquisition of GPS NMEA sentences by the GPS Daughter board. • TCXO_ENABLE: This signal is used to enable the temperature compensated crystal oscillator.
PAGE 3
C-GPS Overview and Usage NOTE: To retrieve the PVT information, the user has to send a configuration SMS to the Wireless CPU where the Query Application is in execution. The Configuration SMS should have the following format: INFO:: 1. : This is the Password which is configured using AT+PASSWORD command. The default value of the password is “CGPS”. 2. : This is the optional field which conveys the phone number to which the PVT information is sent.
PAGE 4
C-GPS Overview and Usage 12. APPLICATION NOT E 13. 5.4 Steps to Download the Samples NOTE: UART2 or USB cannot be used to download the Open AT application. ® 5.4.1 Downloading using XModem Protocol The user can download the sample using the XModem protocol using Hyperterminal (or a similar serial port utility which provides XModem protocol to transfer information). Following steps should be taken to download the sample 1. Connect UART1 with the PC which has the application binary.
PAGE 5
C-GPS Overview and Usage WM_DEV_C-GPS_APN_001-001 This section provides vital statistical information regarding the performance and NMEA Frame description. 6.1 Performances 6.1.
PAGE 6
C-GPS Overview and Usage $GPZDA,hhmmss.ss,dd,mm,yyyy,xx,yy,*hh • • • • • • • • • • • • • • • • • • • hhmmss.ss UTC of position fix (time) A Data Status (A = OK, V = Void) llll.ll Destination waypoint latitude E N or S (for latitude) yyyyy.
PAGE 7
C-GPS Overview and Usage 9 SOFTWARE COMPATIBILITY MATRIX List all current software configurations and compatibility with this application note. ® ® Open AT SDK 4.11 Open AT Plug-Ins WIP v1.10.02 10 SUPPORT For direct clients: contact your Wavecom FAE For distributor clients: contact your distributor FAE For distributors: contact your Wavecom FAE APP LICATION ® Open AT FW 6.