[{"_1":2,"_42":-5,"_43":-5},"loaderData",{"_3":4,"_10":11,"_40":-5,"_41":-5},"root",{"_5":-5,"_6":-5,"_7":-5,"_8":9},"user","shoppingCartId","toast","locale","en","routes/_store+/_readers+/email_author.$slug/route",{"_12":13,"_39":-5},"book",{"_14":15,"_16":17,"_18":19,"_20":21,"_22":23,"_24":25},"id","Z2lkOi8vbGVhbnB1Yi9TdG9yZTo6Qm9va1Byb2R1Y3QvMTg5MTU","title","GPS Tracker Project for Cortex-M3 ARM","state","published","contactAuthorMethod","email","aboutText","

This book documents and provides requirements, architecture, design, and source coed for a project to build a tracking device using GPS and a cell modem.

The software uses simple state machines to parse GPS NMEA sentences, and to interact with the on-board cell modem which exchanges text messages with the user's smart phone.

A free version of the GNU ARM compiler was used under Windows 7 to build the system. Startup code and Linker script were supplied by the free IDE used to develop and debug the program. Those files are included in the book. A makefile is included which can build the debug or release versions of the code without using the IDE.

Source code includes a FIFO manager to handle the interrupt-driven UART interfaces to GPS and cell modem. A time converter changes GPS UTC time into Unix UTC time for use by a module which schedules transmission of position reports to the user.

Requirements, system architecture, and complete design documentation make it easy to follow the source code, or to make changes and additions.

A collection of verification and validation tests are described, which can be used to make sure source code changes have not broken any features of the program.

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