Texas Instruments Stellaris LM3S3748 Manual

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3 1

Stellaris® LM3S3748 Evaluation Kit

The Stellaris LM3S3748 Evaluation Kit provides a low-cost way to start designing

applications with Stellaris microcontrollers on a compact and versatile evaluation platform.

The evaluation kit design highlights the LM3S3748 microcontroller’s key features including

USB 2.0 full-speed (12 Mbps) controller, Analog-to-Digital Converter (ADC), and serial

interfaces. The LM3S3748 Evaluation Board (EVB) includes connectors for both embedded

USB Host and USB Device operation.

The LM3S3748 EVB can be used either as an evaluation platform or as a low-cost in-circuit

debug interface (ICDI). In ICDI mode, the on-board microcontroller is bypassed, allowing

programming or debugging of an external target.

Power to the EVB can be supplied through the DC jack, the USB Device connector, or the

USB debug interface connector. A small switch controls whether the board is bus-powered

using the USB Device connector or self-powered using the DC jack or USB debug interface

connector.

WARNING: Do not change the power mode switch while power is applied. Doing so

may damage the switch contacts.

LM3S3748 Evaluation Board

Requirements

You have a PC with a USB port, running Microsoft® Windows 2000, XP, or Vista

You have the Stellaris LM3S3748 Evaluation Kit Documentation and Software CD

Initial Board Set-Up

The initial board set-up of the LM3S3748 EVB consists of powering the board and installing

the FTDI drivers that are needed for debug communication.

Powering the EVB

The first step for the initial board set-up is to power the EVB.

1) Move the USB power mode switch (SW3) to the “SELF” position (see the figure that

follows).

Note: The switch must be placed in the “SELF” position for the initial board setup to

work correctly.

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3

USB Power Mode Switch (SW3)

EVB is Bus Powered

EVB is Self Powered

2) Using one of the USB cables provided in the kit, connect the mini-b (smaller) end of

the USB cable to the USB debug interface connector labeled “DEBUG USB” on the

EVB.

Note: If the USB cable is not plugged into the “DEBUG USB” connector, the board

will not be powered and you will not be able to install the FTDI drivers in the next

section.

3) Connect the other end (Type A) of the USB cable to a free USB port on your host PC.

The PC’s USB port 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.

Installing the FTDI Drivers

The next step is to install the FTDI drivers for the board. Some customers with previous

installations of the FTDI drivers may experience trouble when installing newer (2.02.04 and

later) versions of the drivers. The problem only seems to affect users of Windows XP, and not

Windows Vista. If you have any problems with the driver installation, see the

http://www.luminarymicro.com/ftdi-driver web site for information.

1) When you power the EVB using the “DEBUG USB” connector for the first time,

Windows starts the Found New Hardware Wizard and asks if Windows can connect to

Windows Update to search for software. Select “No, not this time” and then click

Next.

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3

2) Next, the Found New Hardware Wizard asks you from where to install the software.

Select “Install from a list or specific location (Advanced)” and click Next.

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3

3) 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.

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3

4) A warning may pop up during the Hardware Installation like the one below; click

Continue Anyway.

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3

5) Windows finishes installing the drivers for “Stellaris Evaluation Board A.” When the

driver install is finished, the Found New Hardware Wizard window appears like the

one below. Click Finish to close the dialog box.

You have just installed the drivers for “Stellaris Evaluation Board A.” The USB device built

into the EVB is a composite USB device. After you click Finish, Windows automatically

installs a driver for the “Stellaris 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

“Stellaris Virtual COM Port.” Again, follow the same instructions to install the drivers for this

device.

Now all of the FTDI drivers for the LM3S3748 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.

With the drivers installed, Windows automatically detects any new Stellaris boards that you

attach, and install the drivers for you.

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3

Quickstart Application

The LM3S3748 Evaluation Board comes preprogrammed with a quickstart application. Once

you have powered the board, this application runs automatically. You have probably already

noticed this running as you installed the drivers. A splash screen appears on the LCD for a

few seconds before the application begins.

The quickstart application provides a simple two channel oscilloscope sampling at up to 1M

samples per second. The two oscilloscope channels are differential measurement channels

which provide waveform acquisition using the LM3S3748 microcontroller’s Analog-to-

Digital Converter (ADC). The evaluation board includes an oscilloscope header that contains

the two channel differential inputs, two test point pins, and two test ground pins.

Test Point 1 is connected to the speaker input on the EVB and allows the signal for the

keyboard click to be viewed. Note that waveform capture is typically not taking place while

the keyboard is being serviced so the click may not be seen on the waveform display for every

keypress.

Test Point 2 is connected to the output of a PWM generator set to drive a 1KHz square wave.

Test Ground

Channel 1-

Channel 1+

Test Point 1

Test Point 2

Channel 2+

Channel 2-

Test Ground

The EVB has a four-way navigation switch with press-to-select functionality that is used to

configure the oscilloscope. The navigation switch is labeled “NAVIGATE” on the board.

Rocking the control in the desired direction sends “up,” “down,” “left,” or “right” messages to

the application and pressing on the center sends the “select” message.

Controls and settings are arranged into groups by function such as display settings, trigger

settings, file operations, and setup choices. These groups are accessed by pressing “select” to

LM3S3748 EVALUATION KIT

README FIRST

Rev. 1.3

display the main menu. With the menu displayed, use “up” and “down” to select between the

available groups. When the desired group is highlighted, press “select” once again to dismiss

the menu.

Controls from the currently selected group are shown in the bottom portion of the LCD. Use

“up” and “down” to cycle through the controls in the group and “left” and “right” to change

the value of, or select the action associated with, the control which is currently displayed.

Using the oscilloscope to view Test Point 1 and Test Point 2:

1) Connect Test Point 1 to Channel 1+.

2) Connect Test Ground to Channel 1-.

3) Connect Test Point 2 to Channel 2+.

4) Connect Test Ground to Channel 2-. The connections should look like the graphic

below.

USB Host Connector

USB Device Connector

Stellaris

LM3S3748

Microcontroller

MicroSD card slot Oscilloscope terminals

Reset switch

USB interface

for Debugger

JTAG/SWD

input and

output

34-pin I/O

break-out

header

Status LED

34-pin I/O break-

out header Speaker Navigation switch with press-to-select

5 VDC supply

input

LCD Panel

USB Power

Mode Switch

Oscilloscope leads connected to test points

5) The test point signals should now be visible on the LCD. To modify the volts per

division and time per division options, follow the additional steps below.

6) Press “select” to bring up the main menu, navigate to highlight the “Display” group,

and press “select” again. The “Display” group will be displayed at the bottom of the

LCD.

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Rev. 1.3 10

Note: The “Display” group is the default active group after power-up.

7) Press “up” or “down” until the “Timebase” option is selected and then press “left” or

“right” to modify the amount of time per division.

8) Press “up” or “down” until the “Ch1 Scale” or “Ch2 Scale” option is selected and then

press “left” or “right” to modify the number of volts per division for that channel.

USB Device Mode

The quickstart oscilloscope application can connect to a Windows host machine via USB

where a companion application running on the PC can be used to control the oscilloscope and

display and save the waveforms. In this mode, the LM3S3748 EVB will be operating in USB

device mode.

The first step is to install the necessary USB drivers on the PC.

1) Disconnect the USB cable from the USB connector labeled “DEBUG USB” if

connected.

2) Move the USB power mode switch (SW3) to the “BUS” position.

3) Connect the mini-b (smaller) end of the USB cable to the USB device connector

labeled “USB DEVICE” on the EVB. Connect the other end (Type A) to a free USB

port on your host PC.

4) Windows starts the Found New Hardware Wizard and asks if Windows can connect to

Windows Update to search for software. Select “No, not this time” and then click

Next.

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