Luminary Micro Stellaris LM3S811 User manual

EK-LM3S811-01 Copyright © 2006 Luminary Micro, Inc.
Stellaris® LM3S811
Evaluation Board
USER’S MANUAL

2December 22, 2006
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Luminary Micro, Inc.
108 Wild Basin, Suite 350
Austin, TX 78746
Main: [phone]
Fax: [phone]
http://www.luminarymicro.com

Stellaris® LM3S811 Evaluation Board
December 22, 2006 3
Revision History
This table provides a summary of the document revisions.
Date Revision Description
September 2006 00 Initial release of doc to customers.
December 2006 01 Changed value in Table C-1 for Pad 11.

4December 22, 2006

Stellaris® LM3S811 Evaluation Board
December 22, 2006 5
Table of Contents
Chapter 1: Stellaris® LM3S811 Evaluation Board ......................................................................................... 9
Features.............................................................................................................................................................. 9
Block Diagram .................................................................................................................................................. 10
Evaluation Kit Contents .................................................................................................................................... 10
Evaluation Board Specifications ................................................................................................................... 10
System Requirements................................................................................................................................... 11
Supported Devices........................................................................................................................................ 11
Features of the LM3S811 Microcontroller......................................................................................................... 11
Chapter 2: Getting Started ............................................................................................................................. 13
Powering the Board .......................................................................................................................................... 13
Installing the Drivers ......................................................................................................................................... 13
Driver Installation .......................................................................................................................................... 13
Completing Driver Installation ....................................................................................................................... 13
Running the Quickstart Application................................................................................................................... 14
Chapter 3: Hardware Description .................................................................................................................. 15
LM3S811 Microcontroller .................................................................................................................................. 15
Device Overview ........................................................................................................................................... 15
Clocking ........................................................................................................................................................ 15
Reset............................................................................................................................................................. 15
Power Supply................................................................................................................................................ 15
Debugging..................................................................................................................................................... 15
USB Device Controller Functions ..................................................................................................................... 16
Device Overview ........................................................................................................................................... 16
USB to JTAG/SWD ....................................................................................................................................... 16
Virtual COM Port........................................................................................................................................... 16
Organic LED Display ........................................................................................................................................ 16
Features........................................................................................................................................................ 16
Control Interface ........................................................................................................................................... 16
Power Supply................................................................................................................................................ 17
Design Guidelines......................................................................................................................................... 17
Further Reference......................................................................................................................................... 17
Other Peripherals.............................................................................................................................................. 17
Thumbwheel Potentiometer .......................................................................................................................... 17
User LED ...................................................................................................................................................... 17
User Pushbutton ........................................................................................................................................... 17
Bypassing Peripherals ...................................................................................................................................... 17
Interfacing to the EVB....................................................................................................................................... 18
Using the In-Circuit Debugger Interface ........................................................................................................... 18
ICDI Features................................................................................................................................................ 18
Enabling ICDI Mode...................................................................................................................................... 19
ARM Target Cable ........................................................................................................................................ 19
Starting ICDI ................................................................................................................................................. 19

Stellaris® LM3S811 Evaluation Board
December 22, 2006 6
Chapter 4: Communications .......................................................................................................................... 21
Using the Virtual COM Port .............................................................................................................................. 21
Confirming Driver Installation........................................................................................................................ 21
Installing the VCP Device Driver................................................................................................................... 22
About HyperTerminal ........................................................................................................................................ 24
Starting HyperTerminal ................................................................................................................................. 24
Appendix A: Contact Information ................................................................................................................. 27
Appendix B: Schematics................................................................................................................................ 29
Appendix C: Connection Details ................................................................................................................... 33
Component Locations....................................................................................................................................... 33
Evaluation Board Dimensions........................................................................................................................... 33
I/O Breakout Pads and Recommended Connectors......................................................................................... 34
ARM Target Pinout ........................................................................................................................................... 35

Stellaris® LM3S811 Evaluation Board
December 22, 2006 7
List of Figures
Figure 1-1. Evaluation Board Layout ................................................................................................................. 9
Figure 1-2. LM3S811 Evaluation Board Block Diagram .................................................................................. 10
Figure 3-1. ICD Interface Mode ....................................................................................................................... 18
Figure 4-1. Check VCP Driver Installation ....................................................................................................... 21
Figure B-1. LM3S811 Microcontroller (sheet 1 of 2) ........................................................................................ 30
Figure B-2. LM3S811 Microcontroller (sheet 2 of 2) ........................................................................................ 31
Figure C-1. Component Locations ................................................................................................................... 33
Figure C-2. Evaluation Board Dimensions ....................................................................................................... 33

Stellaris® LM3S811 Evaluation Board
December 22, 2006 8
List of Tables
Table 3-1. Isolating On-Board Hardware........................................................................................................ 18
Table C-1. I/O Breakout Pads ......................................................................................................................... 34
Table C-2. Recommended Connectors........................................................................................................... 34
Table C-3. 20-Pin JTAG/SWD Configuration .................................................................................................. 35

12/22/06 9
Stellaris® LM3S811 Evaluation Board
The Stellaris® LM3S811 Evaluation Board is both a compact and versatile evaluation platform for
the Stellaris LM3S811 ARM® Cortex™-M3-based microcontroller, and an In-Circuit Debug
Interface (ICDI) for any Stellaris microcontroller-based target board. The EVB allows users to
evaluate, prototype, and create application-specific designs.
Features
The Stellaris® LM3S811 Evaluation Board includes the following features:
Stellaris® LM3S811 microcontroller
OLED graphics display with 96 x 16 pixel resolution
User-programmable pushbutton and LED
Reset pushbutton and power indicator LED
Thumbwheel potentiometer for driving an Analog-to-Digital Converter (ADC) input
Standard ARM® 20-pin JTAG debug connector for use as an In-Circuit Debug Interface (ICDI)
I/O signal break-out pads for hardware prototyping
UART0 accessible through a USB Virtual COM Port (VCP)
USB interface for all communication and power
Evaluation copy of the Keil™ RealView® Microcontroller Development Kit software tools
Figure 1-1 shows the layout of the Stellaris® LM3S811 Evaluation Board.
Figure 1-1. Evaluation Board Layout
Thumbwheel
Potentiometer
USB Interface
User LED
User Push Switch
OLED DisplayStellarisTM
LM3S811
Reset
Switch
JTAG/SWD to
external target
CHAPTER 1

Block Diagram
10 12/22/06
Block Diagram
Figure 1-2. LM3S811 Evaluation Board Block Diagram
Evaluation Kit Contents
The evaluation kit contains everything needed to develop and run applications for Stellaris
microcontrollers including:
LM3S811 Evaluation Board (EVB)
USB cable
20-pin JTAG/SWD target cable
CD containing:
–Keil™ RealView® Microcontroller Development Kit RVMDK (16 KB limited)
–Complete documentation
–Quickstart guide
–Quickstart source code
–DriverLib and example source code
Evaluation Board Specifications
Board supply voltage: 4.37–5.25 Vdc from USB connector
Board supply current: 80 mA typ (fully active, CPU at 50 MHz)
Break-out power output: 3.3 Vdc (100 mA max)
USB
Stellaris
LM3S811
MCU
+5V
Dual
USB
Device
Controller
I/O Signals
OLED Display
96 x 16
Debug
Switch
Pot
LED
I/O Signal Break -out
I/O Signal Break -out
20-pin ARM
JTAG/SWD Output
USB Cable
Reset
+3.3V Voltage
Regulator
SWD/JTAG
Mux
UART0
Reset
Target
Cable

Stellaris® LM3S811 Evaluation Board
12/22/06 11
Dimensions: 3.65” x 1.40” x 0.30” (LxWxH)
RoHS status: Compliant
System Requirements
Microsoft Windows 2000, XP, or 2003
128 MB of RAM (512 MB recommended)
100 MB of available hard-disk space
1024 x 768 minimum screen resolution
CD-ROM drive
USB port
Supported Devices
In-Circuit Debug Interface (ICDI) mode presently supports all Luminary Micro Stellaris Family
devices.
Features of the LM3S811 Microcontroller
32-bit ARM® Cortex™-M3 v7M architecture optimized for small-footprint embedded
applications
–Thumb®-compatible Thumb-2-only instruction set processor core for high code density
–50-MHz operation
–Hardware-division and single-cycle-multiplication
–Integrated Nested Vectored Interrupt Controller (NVIC) providing deterministic interrupt
handling
–27 interrupt channels with eight priority levels
64 KB single-cycle flash with two forms of flash protection on a 2-KB block basis
8 KB single-cycle SRAM
Three timers, each of which can be configured: as a single 32-bit timer, as a dual 16-bit timer
with capture and simple PWM modes, or to initiate an ADC event
Real-Time Clock (RTC) capability
Separate watchdog clock with an enable
Programmable interrupt generation logic with interrupt masking
Lock register protection from runaway software
Reset generation logic with an enable/disable Synchronous Serial Interface (SSI)
Programmable interface operation for Freescale SPI, National Semiconductor
MICROWIRE™, or Texas Instruments synchronous serial
–Master or slave operation
Two fully programmable 16C550-type UARTs
–Separate 16x8 transmit (TX) and 16x12 receive (RX) FIFOs to reduce CPU interrupt
service loading

Features of the LM3S811 Microcontroller
12 12/22/06
–Programmable baud-rate generator
Analog-to-Digital Converter (ADC)
–Single- and differential-input configurations
–Four 10-bit channels (inputs) when used as single ended inputs
–Sample rate of 500 thousand samples/second
I2C Bus with Master and slave receive and transmit operation with transmission speed up to
100 Kbps in Standard mode and 400 Kbps in Fast mode
Six motion-control PWM outputs
1 to 32 GPIOs, depending on user configuration
On-chip Linear Drop-Out (LDO) voltage regulator
3.3-V supply brownout detection and reporting via interrupt or reset
On-chip temperature sensor
48-pin RoHS-compliant LQFP
Industrial operating temperature

12/22/06 13
Getting Started
The Stellaris LM3S811 Evaluation Kit EKK-LM3S811 Quickstart provides step-by-step instructions
for getting started with your Stellaris LM3S811 Evaluation Kit. For your convenience these
instructions are summarized below.
Powering the Board
The Stellaris LM3S811 Evaluation Board (EVB) is configured for immediate use. To power the
EVB, use the USB cable supplied in the kit. Connect the mini-b (smaller) end of the USB cable to
the connector labeled “USB” on the EVB. Connect the other end (Type A) to a free USB port on
your host PC. The USB interface is capable of sourcing up to 500 mA for each attached device,
which is sufficient for the evaluation board. If connecting the board through a USB hub, it must be
a powered hub.
When you plug in the EVB for the first time, Windows starts the Found New Hardware Wizard. The
Stellaris LM3S811 Evaluation Kit Quickstart Guide steps through the process of installing drivers
for the Stellaris LM3S811 Evaluation Board.
Installing the Drivers
The Stellaris LM3S811 Evaluation Board requires several hardware drivers. All drivers are located
in the \Tools\Ftdi directory on the Software and Documentation CD. Each time Windows requests a
driver for this device, point it to the Software and Documentation CD.
Driver Installation
When the Found New Hardware Wizard starts, Windows asks if it can connect to Windows Update
to search for software. Select “No, not this time,” and then click Next.
The Found New Hardware Wizard then asks you from where to install the software. Select “Install
from a list or specific location (Advanced)” and click Next.
Make sure the Documentation and Software CD that came with the evaluation kit is in your
CD-ROM drive. Select “Search for the best driver in these locations,” and check the “Search
removable media (floppy, CD-ROM…)” option. Click Next.
A warning pops up during the Hardware Installation; click Continue Anyway.
Windows now finishes installing the drivers for “LM3S811 Evaluation Board A.” When the driver
install is finished, a window appears. Click Finish to close the dialog box.
Completing Driver Installation
You have just installed the drivers for “LM3S811 Evaluation Board A”. The USB device built into
the EVB is a composite USB device. After you click Finish, a new Found New Hardware Wizard
window appears asking to install drivers for another device. This is for the “LM3S811 Evaluation
Board B” part of the composite USB device. Follow the same instructions as above to install the
drivers for this device.
The Found New Hardware Wizard appears one last time. This is to install the drivers for the
“LM3S811 Virtual COM Port”. Again, follow the same instructions above to install the drivers for
this device.
CHAPTER 2

Getting Started
14 12/22/06
Now all of the hardware drivers for the LM3S811 Evaluation Board have been installed. These
drivers give the debugger access to the JTAG interface and the host PC access to the Virtual COM
Port.
Running the Quickstart Application
The quickstart application is a game in which you navigate a ship through an endless tunnel. Use
the potentiometer (POT) to move the ship up and down, and the user pushbutton (USER) to fire a
missile to destroy obstacles in the tunnel. Score accumulates for survival and destroying
obstacles. The game lasts for only one ship; the score displays at the end of the game.
Since the OLED display on the evaluation board has burn-in characteristics similar to a CRT, the
application also contains a screen saver. The screen saver only becomes active if two minutes
have passed without the user pushbutton being pressed while waiting to start the game (i.e., the
screen saver never appears during game play). An implementation of the Game of Life is run with
a field of random data as the seed value.
After two minutes of running the screen saver, the display turns off and the user LED blinks. Exit
either mode of screen saver (Game of Life or blank display) by pressing the user pushbutton
(USER). Press the button again to start the game.
While the game is being played, a running tally of the score is output through UART0 of the
LM3S811. UART0 is connected to the FTDI’s second serial channel. This serial channel is
available to Windows as a Virtual COM Port. To view the score, open up a terminal application
such as HyperTerminal. Connect using COM#, where # is the number Windows has assigned the
Virtual COM Port. Set the serial connection to a baud rate of 115200, 8 data bits, no parity, 1 stop
bit, and no flow control.
Important: The quickstart application will not run if one or more jumpers are removed.

12/22/06 15
Hardware Description
This chapter provides the hardware description for the LM3S811 microcontroller including the
peripherals included in the evaluation kit.
LM3S811 Microcontroller
Device Overview
The heart of the EVB is a Stellaris LM3S811 ARM® Cortex™-M3-based microcontroller. The
LM3S811 offers 64 KB flash memory, 50-MHz operation, a 4-channel ADC, and a wide range of
peripherals. Refer to the LM3S811 data sheet (order number DS-LM3S811) for complete device
details.
The LM3S811 microcontroller is factory programmed with a quickstart demo program. The
quickstart program resides in the LM3S811 on-chip flash memory and runs each time power is
applied, unless ICDI mode is in use, or the quickstart has been replaced with a user program.
Clocking
A single external 6.0-Mhz crystal drives the LM3S811 microcontroller. All required internal clocks
are generated automatically within the device. The LM3S811 microcontroller is designed to run the
ARM Cortex core at 50 Mhz on this evaluation board.
Reset
The LM3S811 microcontroller shares its external reset input with the OLED display. Reset is
asserted (Active Low) under any one of the following conditions:
Power-on reset (duration set by resistor R1 and capacitor C17)
Reset switch SW2 is held down
In ICDI mode
By the USB device controller (U2 FT2232), when instructed by the debugger
The Keil RVMDK debugger does not support external reset. Instead, the target device is reset
using JTAG operations. In ICDI mode, the reset push-switch has no effect.
Power Supply
The LM3S811 is powered from a +3.3-V supply rail that is common to all devices on the EVB. A
low-dropout (LDO) regulator regulates +5 V power from the USB cable to +3.3 V. +3.3 V at up to
100 mA is available for powering external circuits at break-out pin 20.
Debugging
Stellaris microcontrollers support programming and debugging using either JTAG or SWD. JTAG
uses the TCK, TMS, TDI, and TDO signals. SWD requires fewer signals—SWCLK, SWDIO, and
SWO. The debugger determines which debug protocol is used. For example, Keil RVMDK tools
support only JTAG debugging.
CHAPTER 3

Hardware Description
16 12/22/06
JTAG/SWD signals are multiplexed with GPIO functions inside the Stellaris microcontroller. Do not
configure JTAG/SWD pins (including PB7/TRST) as GPIO. Doing this prevents in-circuit
programming and debugging.
USB Device Controller Functions
Device Overview
An FT2232 device from Future Technology Devices International Ltd manages USB-to-serial
conversion. The FT2232 is factory configured by Luminary Micro to implement a JTAG/SWD port
(synchronous serial) on channel A and a Virtual COM Port (VCP) on channel B. This feature
allows two simultaneous communications links between the host computer and the target device
using a single USB cable. Separate Windows drivers for each function are provided on the
Documentation and Software CD.
A small serial EEPROM holds the FT2232 configuration data. The EEPROM is not accessible by
the LM3S811 microcontroller.
For full details on FT2232 operation, go to www.ftdichip.com.
USB to JTAG/SWD
The FT2232 USB device performs JTAG/SWD serial operations under the control of the debugger.
Two 74LV125 hex buffers multiplex SWD and JTAG functions and provide direction control for the
bi-directional data line when working in SWD mode.
Virtual COM Port
The Virtual COM Port (VCP) allows Windows applications (such as HyperTerminal) to
communicate with UART0 on the LM3S811 over USB. Once the FT2232 VCP driver is installed,
Windows assigns a COM port number to the VCP channel.
For more information, see Using the Virtual COM Port on page 21.
Organic LED Display
The EVB features an Organic LED (OLED) graphics display with 96 x 16 pixel resolution. OLED is
a new technology that offers many advantages over LCD display technology.
Features
Osram OS096016 series display
96 columns by 16 rows
1 bit/pixel monochrome
High-contrast (typ. 2000:1)
Excellent brightness (120 cd/m2)
Fast response
Control Interface
The OLED display has a built-in controller IC (SSD0303) with synchronous serial and I2C
interfaces. I2C is used on the EVB as it only requires two microcontroller pins. The OLED display
has a fixed I2C address of 0x3d. The Stellaris driver library (DriverLib) (included on the

Stellaris® LM3S811 Evaluation Board
12/22/06 17
Documentation and Software CD) contains complete drivers with source-code for the OLED
display.
Note that the SSD0303’s I2C bus implementation is not 100% compliant with the I2C specification.
Designers should refer to the SSD0303 datasheet before connecting other I2C devices to the bus.
Power Supply
A +9 V supply is needed to bias the OLED display. Conveniently, the SSD0303 IC includes an
on-chip voltage boost controller. A few external components complete the simple switching power
supply. This supply is dedicated to the OLED display and should not be used to power other
devices.
Design Guidelines
The OLED display has a lifetime of about 10,000 hours. It is also prone to degradation due to burn-
in, similar to CRT and plasma displays. The quickstart application includes both a screen-saver
and a power-down mode to extend display life. These factors should be considered when
developing EVB applications that use the OLED display.
When using the EVB as an In-Circuit Debug Interface (ICDI), the OLED display is held in reset to
reduce power consumption and eliminate display wear-out.
Further Reference
For additional information on the OS096016 OLED display, visit www.osram-os.com.
Full details on the SSD0303 controller are available from Solomon Systech, Ltd.
(www.solomon-systech.com).
Other Peripherals
Thumbwheel Potentiometer
A thumbwheel potentiometer connects to Channel 0 of the Analog-to-Digital Converter (ADC). A
padding resistor (R31) sets the voltage range to 0 to 3.0 V. This corresponds with the full-scale
range of the LM3S811’s 10-bit ADC. The ADC input voltage increases with clockwise
potentiometer rotation.
User LED
A user LED (D2) is provided for general use. The LED is connected to PC5/CCP1, allowing the
option of either GPIO or PWM control (brightness control). Refer to the Quickstart Application
source code for an example of PWM control.
User Pushbutton
A user pushbutton (SW1) is provided for general use. The switch interfaces to PC4 of the
LM3S811.
Bypassing Peripherals
The EVB’s on-board peripheral circuits require seven GPIO lines, leaving up to 25 GPIO lines
immediately available for connection to external circuits. If all GPIO lines are needed, then the
on-board hardware can be bypassed. The EVB is populated with seven 0-ohm resistor jumpers,
which can be removed to isolate on-board hardware.

Hardware Description
18 12/22/06
Important: The quickstart application will not run if one or more jumpers are removed.
Interfacing to the EVB
An array of accessible I/O signals makes it easy to interface the EVB to external circuits. All
LM3S811 I/O lines (except those with JTAG functions) are brought out to 0.1” pitch pads. For quick
reference, silk-screened labels on the PCB show primary pin functions.
Table C-1 on page 34 has a complete list of I/O signals as well as recommended connectors.
Most LM3S811 I/O signals are +5-V tolerant. 5-V tolerant pins will not be damaged when
connected to 5-V logic circuits. It is recommended that datasheets be checked for compatibility
when mixing logic types. Refer to the LM3S811 datasheet for detailed electrical specifications.
Using the In-Circuit Debugger Interface
The Stellaris LM3S811 Evaluation Kit can operate as an In-Circuit Debugger Interface (ICDI). ICDI
acts as a USB to the JTAG/SWD adaptor, allowing debugging of any external target board that
uses a Stellaris microcontroller.
Figure 3-1. ICD Interface Mode
The debug interface operates in either Serial-Wire Debug (SWD) or full JTAG mode, depending on
the configuration in the debugger IDE.
The Keil RVMDK does not distinguish between normal Evaluation Board mode and ICDI mode.
The only requirement is that the correct Stellaris device is selected in the project configuration.
ICDI Features
ICDI includes the following features:
Table 3-1. Isolating On-Board Hardware
MCU Pin EVB Function To Isolate, Remove...
Pin 33 PB2/I2CSCL I2C SCL to Display JP1
Pin 34 PB3/I2CSDA I2C SDA to Display JP2
Pin 17 PA0/U0Rx VCP Receive JP3
Pin 18 PA1/U0Tx VCP Transmit JP4
Pin 1 ADC0 ADC Input from Thumbwheel Potentiometer JP5
Pin 30 GPIO PB7 User Push Switch Input JP6
Pin 29 GPIO PC4 User LED output JP7
LM3S811 EVB Target
Board
Stellaris
MCU
JTAG/SWD
Target Cable
`USB
PC wi th IDE/
debugger
Stellaris
MCU
This LM 3 S811 is he ld
in re set

Stellaris® LM3S811 Evaluation Board
12/22/06 19
Standard ARM® 20-pin JTAG debug connector
USB 2.0 full speed interface allows JTAG/SWD debug
Compatible with leading ARM Integrated Development Environment (IDE) packages including
Keil RVMDK.
Enabling ICDI Mode
ICDI mode is enabled when the 20-pin JTAG/SWD target cable is connected to an external target.
In this mode, the on-EVB LM3S811 microcontroller and OLED display are held in reset.
Applications can not be executed in the on-EVB microcontroller when the EVB is connected as an
ICDI device.
ARM Target Cable
The evaluation kit includes a 3-inch target cable for connecting the EVB to an external target.
Cables up to 8-inch long can be used if required.
Target cable pin assignments are compatible with the ARM 20-pin standard (see Table C-3 on
page 35). The target board must have GND connections on even pins from 4 through 20,
otherwise the ICDI is not enabled when the target is connected. In this case, there will be conflict
between the JTAG/SWD signals on the LM3S811evaluation board and the external Stellaris
device.
When using the kit as an evaluation board, do not make connections to the debug out connector.
Starting ICDI
With the USB cable removed, connect the EVB to a Stellaris microcontroller-based target board
using the 20-pin JTAG/SWD target cable included in the Stellaris LM3S811 Evaluation Kit.
The red stripe on the cable should match pin 1 on both the EVB debug out connector and the
target. When inserted correctly, the polarizing tab on the connector fits into the slot on the EVB
PCB, so that the ribbon cable exits away from you.
Apply power to the target device, and then connect the USB cable to the LM3S811 Evaluation
Board. The OLED display should not show any information. If it does display an image, then check
the target JTAG/SWD connections to ensure the on-EVB LM3S811 microcontroller is being held in
reset.
The Keil RVMDK is now be able to program and debug the target Stellaris microcontroller.

Hardware Description
20 12/22/06