Texas Instruments Stellaris LM4F120 LaunchPad User manual

EK-LM4F120XL-UM-01 Copyright © 2012 Texas Instruments
SMPU289
User’s Manual
Stellaris® LM4F120 LaunchPad Evaluation
Board

2August 29, 2012
Copyright
Copyright © 2012 Texas Instruments, Inc. All rights reserved. Stellaris and StellarisWare are registered trademarks of Texas Instruments. ARM and
Thumb are registered trademarks, and Cortex is a trademark of ARM Limited. Other names and brands may be claimed as the property of others.
Texas Instruments
108 Wild Basin, Suite 350
Austin, TX 78746
http://www.ti.com/stellaris

August 29, 2012 3
Table of Contents
Chapter 1: Board Overview..............................................................................................................................6
Kit Contents........................................................................................................................................................7
Using the Stellaris® LaunchPad.........................................................................................................................7
Features..............................................................................................................................................................7
BoosterPacks......................................................................................................................................................8
Specifications......................................................................................................................................................8
Chapter 2: Hardware Description....................................................................................................................9
Functional Description ......................................................................................................................................10
(Microcontroller, USB, Expansion, Buttons, and LED (Schematic on page 18)............................................10
Power Management (Schematic on page 19)...............................................................................................13
Stellaris In-Circuit Debug Interface (ICDI) (Schematic on page 20) .............................................................14
Chapter 3: Software Development ................................................................................................................15
Software Description.........................................................................................................................................15
Source Code.....................................................................................................................................................15
Tool Options .....................................................................................................................................................15
Programming the Stellaris LaunchPad Evaluation Board.................................................................................15
Appendix A: Schematics................................................................................................................................17
Appendix B: Component Locations..............................................................................................................21
Appendix C: Bill of Materials (BOM) .............................................................................................................23
Appendix D: References ................................................................................................................................25

Stellaris® LM4F120 LaunchPad XL User’s Manual
4August 29, 2012
List of Figures
Figure 1-1. Stellaris® LM4F120 LaunchPad Evaluation Board.........................................................................6
Figure 2-1. Stellaris® LaunchPad Evaluation Board Block Diagram.................................................................9
Figure B-1. Stellaris® LaunchPad Component Locations (Top View) .............................................................21
Figure B-2. Stellaris® LaunchPad Dimensions)...............................................................................................22

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List of Tables
Table 1-1. EK-LM4F120XL Specifications........................................................................................................8
Table 2-1. USB Device Signals......................................................................................................................10
Table 2-2. User Switches and RGB LED Signals...........................................................................................10
Table 2-3. J1 Connector.................................................................................................................................11
Table 2-4. J2 Connector.................................................................................................................................11
Table 2-5. J3 Connector.................................................................................................................................12
Table 2-6. J4 Connector.................................................................................................................................12
Table 2-7. Stellaris® In-Circuit Debug Interface (ICDI) Signals......................................................................14
Table 2-8. Virtual COM Port Signals ..............................................................................................................14
Table C-1. EK-LM4F120 Bill of Materials........................................................................................................23

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Board Overview
The Stellaris® LM4F120 LaunchPad Evaluation Board (EK-LM4F120XL) is a low-cost evaluation
platform for ARM® Cortex™-M4F-based microcontrollers. The Stellaris® LaunchPad’s design
highlights the LM4F120H5QR microcontroller's USB 2.0 Device interface and Hibernation module.
The Stellaris® LaunchPad also features programmable user buttons and an RGB LED for custom
applications. The stackable headers of the Stellaris® LM4F120 LaunchPad BoosterPack XL
Interface demonstrate how easy it is to expand the functionality of the Stellaris® LaunchPad when
interfacing to other peripherals with Stellaris® BoosterPacks and MSP430™ BoosterPacks.
Figure 1-1 shows a photo of the Stellaris® LaunchPad.
Figure 1-1. Stellaris® LM4F120 LaunchPad Evaluation Board
CHAPTER 1

Board Overview
August 29, 2012 7
Kit Contents
The Stellaris® LM4F120 LaunchPad Evaluation Kit comes with the following:
Stellaris® LaunchPad Evaluation Board (EK-LM4F120XL)
On-board Stellaris® In-Circuit Debug Interface (ICDI)
USB Micro-B plug to USB-A plug cable
README First document
Using the Stellaris® LaunchPad
The recommended steps for using the Stellaris® LM4F120 LaunchPad Evaluation Kit are:
1. Follow the README First document included in the kit. The README First document will
help get the Stellaris® LaunchPad up and running in minutes. See the
www.ti.com/stellaris-launchpad web site for additional information to get started.
2. Experiment with LaunchPad BoosterPacks. Stellaris® BoosterPacks and compatible
MSP430™ BoosterPacks can be found at the www.ti.com/stellaris-launchpad web site.
3. Take your first step toward developing an application with Project 0 using your
preferred ARM tool-chain and the Stellaris Peripheral Driver Library. Software
applications are loaded using the on-board Stellaris® In-Circuit Debug Interface (ICDI). See
Chapter 3, “Software Development” on page 20, for the programming procedure. The
StellarisWare Peripheral Driver Library Software Reference Manual contains specific
information on software structure and function. For more information on Project 0, go to the
www.ti.com/stellaris-launchpad/project0 web site.
4. Customize and integrate the hardware to suit an end application. This user's manual is an
important reference for understanding circuit operation and completing hardware modification.
Features
The Stellaris® LaunchPad includes the following features:
Stellaris® LM4F120H5QR microcontroller
USB Micro-B connector for USB Device
RGB user LED
2 user switches (application/wake)
Available I/O brought out to headers on a 0.1" grid
On-board Stellaris® In-Circuit Debug Interface (ICDI)
Switch-selectable power sources
–ICDI
–USB Device
Reset switch
Preloaded RGB quickstart application
Supported by StellarisWare® software including the USB library and the peripheral driver
library

Stellaris® LM4F120 LaunchPad User’s Manual
8August 29, 2012
Stellaris® LM4F120 LaunchPad BoosterPack XL Interface which features stackable headers
to expand the capabilities of the Stellaris® LaunchPad development platform
–For a complete list of available BoosterPacks that can be used with the Stellaris®
LaunchPad, see the www.ti.com/stellaris-launchpad web site.
BoosterPacks
Stellaris® LaunchPad provides an easy and inexpensive way to develop applications with the
Stellaris® LM4F120H5QR microcontroller. Stellaris® BoosterPacks and MSP430™ BoosterPacks
expand the available peripherals and potential applications of the Stellaris® LaunchPad.
BoosterPacks can be used with the Stellaris® LaunchPad or just use the on-board
LM4F120H5QR microcontroller as its processor. See“(Microcontroller, USB, Expansion, Buttons,
and LED (Schematic on page 18)” on page 10 in Chapter 2 for more information.
Build your own BoosterPack and take advantage of Texas Instruments’ web site to help promote it!
From sharing a new idea or project, to designing, manufacturing, and selling your own
BoosterPack kit, TI offers a variety of avenues for you to reach potential customers with your
solutions.
Specifications
Table 1-1 shows the specifications for the Stellaris® LaunchPad.
Table 1-1. EK-LM4F120XL Specifications
Parameter Value
Board supply voltage 4.75–5.25 VDC from one of the following sources:
Debugger (ICDI) USB Micro-B cable (connected to a PC)
USB Device Micro-B cable (connected to a PC)
Dimensions 2.0" x 2.25" x 0.425" (L x W x H)
Break-out power output 3.3 VDC (300 mA max)
5.0 VDC (depends on 3.3 VDC usage, 23 mA - 323 mA)
RoHS status Compliant

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Hardware Description
The Stellaris® LaunchPad includes a Stellaris LM4F120H5QR microcontroller and an integrated
Stellaris® In-Circuit Debug Interface (ICDI) as well as a range of useful peripheral features (see
the block diagram in Figure 2-1). This chapter describes how these peripherals operate and
interface to the microcontroller.
Figure 2-1. Stellaris® LaunchPad Evaluation Board Block Diagram
LM4F120H5QR
Stellaris ICDI
USB Debug
Connector
USB Device
Connector
Power Select
Switch
User
Switches
GPIO
GPIO
GPIO
GPIO
USB
Stellaris®
LaunchPad-Specific
BoosterPack XL
Expansion Headers
MSP430™
LaunchPad-Compatible
Expansion Headers
Device
JTAG/SWD
Power
Management
RGB LED
Debug Breakout Pads
I/O
I/O
Breakout Pads
HIB WAKE
VDD
UART0
ICDI
CHAPTER 2

Stellaris® LM4F120 LaunchPad User’s Manual
10 August 29, 2012
Functional Description
(Microcontroller, USB, Expansion, Buttons, and LED (Schematic on
page 18)
Microcontroller
The Stellaris LM4F120H5QR is a 32-bit ARM® Cortex™-M4F-based microcontroller with 256-KB
Flash memory, 32-KB SRAM, 80-MHz operation, USB Device, Hibernation module, and a wide
range of other peripherals. See the LM4F120H5QR microcontroller data sheet (order number
DS-LM4F120H5QR) for complete device details.
Most of the microcontroller signals are routed to 0.1" pitch headers. An internal multiplexer allows
different peripheral functions to be assigned to each of these GPIO pads. When adding external
circuitry, consider the additional load on the evaluation board’s power rails.
The LM4F120H5QR microcontroller is factory-programmed with a quickstart demo program. The
quickstart program resides in on-chip Flash memory and runs each time power is applied, unless
the quickstart application has been replaced with a user program.
USB Device
The Stellaris® LaunchPad includes a USB Micro-B connector to allow for USB 2.0 Device
operation. The signals shown in Table 2-1 are used for USB Device.
When connected as a USB Device, the evaluationboard can be powered from either the Stellaris®
ICDI or the USB Device connectors. The user can select the power source by moving the POWER
SELECT switch (SW3) to the Device position. See the Power Management schematic on page 19
User Switches and RGB User LED
The Stellaris® LaunchPad comes with an RGB LED. This LED is used in the preloaded RGB
quickstart application and can be configured for use in custom applications.
Two user buttons are included on the board. The user buttons are both used in the preloaded
quickstart application to adjust the light spectrum of the RGB LED as well as go into and out of
hibernation. The user buttons can be used for other purposes in the user’s custom application.
The evaluation board also has a green power LED.
Table 2-2 shows how these features are connected to the pins on the microcontroller.
Table 2-1. USB Device Signals
GPIO Pin Pin Function USB Device
PD4 USB0DM D-
PD5 USB0DP D+
Table 2-2. User Switches and RGB LED Signals
GPIO Pin Pin Function Feature
PF4 GPIO SW1
PF0 GPIO SW2