Texas Instruments Stellaris LM4F120 LaunchPad Manual de usuario

SMPU289

User’s Manual

Stellaris® LM4F120 LaunchPad Evaluation

Board

2August 29, 2012

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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

August 29, 2012 5

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

August 29, 2012 6

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

August 29, 2012 9

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

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

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

Tabla de contenidos

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