TPC-651H/1251H

Industrial Touch Panel

Computers with Intel Atom
Processors

User Manual
 Copyright
The documentation and the software included with this product are copy-
righted 2010 by Advantech Co., Ltd. All rights are reserved. Advantech
Co., Ltd. reserves the right to make improvements in the products
described in this manual at any time without notice. No part of this man-
ual may be reproduced, copied, translated or transmitted in any form or
by any means without the prior written permission of Advantech Co., Ltd.
Information provided in this manual is intended to be accurate and reli-
able. However, Advantech Co., Ltd. assumes no responsibility for its use,
nor for any infringements of the rights of third parties, which may result
from its use.

Acknowledgements
Intel and Pentium are trademarks of Intel Corporation.
Microsoft Windows and MS-DOS are registered trademarks of
Microsoft Corp.
All other product names or trademarks are properties of their respective
owners.

This Manual Covers the Following Models

• TPC-651H
• TPC-1251H

Part No. 2003065101 2nd Edition

Printed in Taiwan June 2010

TPC-651H/1251H User Manual ii

Product Warranty (2 years)
Advantech warrants to you, the original purchaser, that each of its prod-
ucts will be free from defects in materials and workmanship for two years
from the date of purchase.
This warranty does not apply to any products which have been repaired or
altered by persons other than repair personnel authorized by Advantech,
or which have been subject to misuse, abuse, accident or improper instal-
lation. Advantech assumes no liability under the terms of this warranty as
a consequence of such events.
Because of Advantech’s high quality-control standards and rigorous test-
ing, most of our customers never need to use our repair service. If an
Advantech product is defective, it will be repaired or replaced at no
charge during the warranty period. For out-of-warranty repairs, you will
be billed according to the cost of replacement materials, service time and
freight. Please consult your dealer for more details.

If you think you have a defective product, follow these steps:

1. Collect all the information about the problem encountered. (For
example, CPU speed, Advantech products used, other hardware
and software used, etc.) Note anything abnormal and list any
onscreen messages you get when the problem occurs.
2. Call your dealer and describe the problem. Please have your man-
ual, product, and any helpful information readily available.
3. If your product is diagnosed as defective, obtain an RMA (return
merchandize authorization) number from your dealer. This allows
us to process your return more quickly.
4. Carefully pack the defective product, a fully-completed Repair and
Replacement Order Card and a photocopy proof of purchase date
(such as your sales receipt) in a shippable container. A product
returned without proof of the purchase date is not eligible for war-
ranty service.
5. Write the RMA number visibly on the outside of the package and
ship it prepaid to your dealer.

iii
 CE
This product has passed the CE test for environmental specifications
when shielded cables are used for external wiring. We recommend the use
of shielded cables. This kind of cable is available from Advantech. Please
contact your local supplier for ordering information.

FCC Class A
This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interfer-
ence when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own
expense.

Technical Support and Assistance

Step 1. Visit the Advantech web site at www.advantech.com/support
where you can find the latest information about the product.
Step 2. Contact your distributor, sales representative, or Advantech's cus-
tomer service center for technical support if you need additional
assistance. Please have the following information ready before
you call:
- Product name and serial number
- Description of your peripheral attachments
- Description of your software (operating system, version, appli-
cation software, etc.)
- A complete description of the problem
- The exact wording of any error messages

TPC-651H/1251H User Manual iv

Safety Instructions
1. Read these safety instructions carefully.
2. Keep this User's Manual for later reference.
3. Disconnect this equipment from any AC outlet before cleaning.
Use a damp cloth. Do not use liquid or spray detergents for clean-
ing.
4. For plug-in equipment, the power outlet socket must be located
near the equipment and must be easily accessible.
5. Keep this equipment away from humidity.
6. Put this equipment on a reliable surface during installation. Drop-
ping it or letting it fall may cause damage.
7. The openings on the enclosure are for air convection. Protect the
equipment from overheating. DO NOT COVER THE OPENINGS.
8. Make sure the voltage of the power source is correct before con-
necting the equipment to the power outlet.
9. Position the power cord so that people cannot step on it. Do not
place anything over the power cord.
10. All cautions and warnings on the equipment should be noted.
11. If the equipment is not used for a long time, disconnect it from the
power source to avoid damage by transient overvoltage.
12. Never pour any liquid into an opening. This may cause fire or elec-
trical shock.
13. Never open the equipment. For safety reasons, the equipment
should be opened only by qualified service personnel.
14. If one of the following situations arises, get the equipment checked
by service personnel:
a. The power cord or plug is damaged.
b. Liquid has penetrated into the equipment.
c. The equipment has been exposed to moisture.
d. The equipment does not work well, or you cannot get it to work
according to the user's manual.
e. The equipment has been dropped and damaged.
f. The equipment has obvious signs of breakage.
15. DO NOT LEAVE THIS EQUIPMENT IN AN ENVIRONMENT
WHERE THE STORAGE TEMPERATURE MAY GO BELOW -
v
 20° C (-4° F) OR ABOVE 60° C (140° F). THIS COULD DAM-
AGE THE EQUIPMENT. THE EQUIPMENT SHOULD BE IN A
CONTROLLED ENVIRONMENT.
16. CAUTION: DANGER OF EXPLOSION IF BATTERY IS
INCORRECTLY REPLACED. REPLACE ONLY WITH THE
SAME OR EQUIVALENT TYPE RECOMMENDED BY THE
MANUFACTURER, DISCARD USED BATTERIES ACCORD-
ING TO THE MANUFACTURER'S INSTRUCTIONS.
The sound pressure level at the operator's position according to IEC 704-
1:1982 is no more than 70 dB (A).
DISCLAIMER: This set of instructions is given according to IEC 704-1.
Advantech disclaims all responsibility for the accuracy of any statements
contained herein.

Caution!
Danger of explosion if battery is incorrectly replaced. Replace only with
the same or equivalent type recommended by the manufacturer. Dispose
of used batteries according to the manufacturer's instructions.

TPC-651H/1251H User Manual vi

 Contents
Chapter 1 General Information ....................................... 2
1.1 Introduction ....................................................................... 2
1.2 Specifications .................................................................... 3
1.2.1 System Kernel ................................................................ 3
1.2.2 I/O Ports ......................................................................... 3
1.2.3 Safety and Environment ................................................. 3
1.3 LCD Specifications ........................................................... 4
1.4 Touchscreen Specifications............................................... 4
1.5 Power................................................................................. 4
1.6 I/O Ports Arrangement ...................................................... 5
Figure 1.1:TPC-651H - I/O Port Arrangement .............. 5
Figure 1.2:TPC-1251H - I/O Port Arrangement ............ 5
1.7 Panel Mounting ................................................................. 6
Figure 1.3:Panel Mounting ............................................ 6
1.8 Dimensions and Cutout ..................................................... 6
Figure 1.4:TPC-651H Dimensions ................................ 7
Figure 1.5:TPC-1251H Dimensions .............................. 8
Chapter 2 System Setup.................................................. 10
Figure 2.1:Unpack the Package ................................... 10
Figure 2.2:Install CompactFlash Memory Card .......... 11
Figure 2.3:Power Connector and Power Lines ............ 11
Figure 2.4:Power Receptor & Button Pin Assignment 11
Chapter 3 Features in Windows XP Embedded........... 14
3.1 EWF ................................................................................ 14
3.2 HORM............................................................................. 15
Appendix A Serial Port Settings........................................ 18
A.1 COM1/ COM2 Connector Definition ............................. 18
A.2 RS-485 / RS-422 Setting ................................................. 19
Appendix B Watchdog Timer Programming..... 24
B.1 Overview ......................................................................... 24
B.2 Watchdog Timer Programming....................................... 25
Figure B.1:Watchdog timer programming procedure .. 25
Table B.1:Watchdog Timer Registers ......................... 26
B.3 Example Programs .......................................................... 27
Appendix C Watchdog Timer Programming on WinCE 34
C.1 DeviceIOControl ............................................................. 34
C.1.1 Parameters .................................................................... 35
C.2 How to Use the Control Code ......................................... 36
C.2.1 IOCTL _WDT_ENABLE: ........................................... 36
C.2.2 IOCTL _WDT_DISABLE: .......................................... 36
C.2.3 IOCTL_WDT_STROBE: ............................................ 36

vii Table of Contents

 C.2.4 IOCTL_WDT_GETTIMEOUT: .................................. 37
C.2.5 IOCTL_WDT_SETTIMEOUT: .................................. 37
C.2.6 IOCTL_WDT_REBOOT: ........................................... 37
C.3 Examples ......................................................................... 38

TPC-651H/1251H User Manual viii

 CHAPTER
1
2

General Information
Chapter 1 General Information
1.1 Introduction

The TPC-651H and TPC-1251H Touch Panel Computers are state-of-the-

art Human Machine Interfaces featuring 5.7" and 12.1 displays with Intel
Atom eMenlow XL processors and the following key features:

• Fanless
By using a low-power processor, the system does not have to rely on
fans, which often are unreliable and causes dust to circulate inside the
equipment.

• Bright Display
The TFT LCD display suits industrial demands for clear interfaces.

• Wide Operating Temperature & Isolation Protection

These products provide a -20~60° C wide operating temperature solu-
tion and complete isolation protection for their serial ports.

• Windows CE Support
In addition to the OS support of Windows XP, Advantech offers plat-
form support for Windows CE and Windows XP embedded. The
optional Windows CE operating system specifically for Industrial
Touch Panel Computers is also available.

• Energy Star Approval

TPC-651H/1251H User Manual 2

1.2 Specifications

1.2.1 System Kernel

• CPU: Intel Atom Z520 1.33GHz
• BIOS: Award 4 Mbit flash BIOS
• System Chipset: eMenlow XL + Poulsbo
• VGA: Integrated in eMenlow XL
• Ethernet: 10/100/1000Base-T
• Watchdog Timer: W83627DHG watchdog timer; 1.6 second timeout
period
• Storage: CompactFlash slot or SATA HDD x 1

1.2.2 I/O Ports

• 2 serial ports: RS-232 x 1 (w/ isolation), RS-422/485 x 1 (w/ isolation)
• 2 RJ-45 Ethernet port
• 2 USB 2.0 Ports: compliant with USB 1.0 and 1.1. (Host)

1.2.3 Safety and Environment

Safety
• FCC Class A
• CE certificated
• The front bezel is compliant with NEMA 4 and IP65

Environment
• Operating Temperature: -20 ~ 60° C (-4 ~ 140° F)
• Storage Temperature:-30 ~ 80° C (-22 ~ 176° F)
• Humidity: 40° C @ 10~95% relative humidity (non-condensing)
• Vibration: 2 grms (5~500Hz)

3 Chapter 1
1.3 LCD Specifications

TPC-650H TPC-1250H
Display Type TFT LCD TFT LCD

Size (diagonal) 5.7” 12.1”

Maximum Resolution 640 x 480 (VGA) 800 x 600 (SVGA)

Maximum Colors 262K

Viewing Angle 160°/140°

Luminance (cd / m2) 700 450

Contrast Ratio 800:1 700:1

Operating Temp. -30 ~ 85° C

Backlight LED

Backlight Life Time 50,000 hours

Note There might be several bright or dark pixels on

the LCD. This phenomenon is normal in today’s
LCD manufacturing.

1.4 Touchscreen Specifications

• Touch Type: Resistive

• Base Glass Construction: Tempered Glass
• Resolution: 1024 x 1024
• Light Transmission: 80% ± 3% (Measured by BYK-Gardner
• Controller: RS-232 Interface
• Lifespan: 1 million touches at single point

1.5 Power

• Input Voltage: 18 - 32VDC (the fuse will become an open circuit if the
input level exceeds 33VDC)
• Typical: 24VDC@0.93Amp

TPC-651H/1251H User Manual 4

1.6 I/O Ports Arrangement

The arrangement of the I/O ports is shown in in Figure 1.1 and 1.2.

Figure 1.1: TPC-651H - I/O Port Arrangement

Figure 1.2: TPC-1251H - I/O Port Arrangement

5 Chapter 1
1.7 Panel Mounting

1. There is an adhesive waterproof gasket on the AL front bezel.

Make sure the waterproof gasket is in position before installing
TPC into the panel opening.
2. Install the TPC into the panel opening.
3. Find the eight clampers and eight long screws in the accessory
pack. Hook the clampers to the holes around the four sides of the
bezel. Insert the screws into every clamper and fasten them. These
screws will push the mounting panel and fix the unit.
4. The suggested mounting panel thickness is less than 6 mm
(0.236”).

Figure 1.3: Panel Mounting

1.8 Dimensions and Cutout

• Weight: TPC-651H - 1.43kg, TPC-1251H - 2.5kg

• Dimensions (W x H x D):
TPC-651H: 195 x 148 x 58 mm (7.68" x 5.83" x 2.28")
TPC-1251H: 311 x 237 x 52.3 mm (12.24" x 9.33" x 2.06")
• Cutout:
TPC-651H: 189.1 x 142.1 mm
TPC-1251H: 302.5 x 228.5 mm

TPC-651H/1251H User Manual 6

 28.1
114.7
195

132
6
86.1
148
6

6
58

70.5
188.1

141.1

Figure 1.4: TPC-651H Dimensions

7 Chapter 1
 6.50
4

247.2
311
180

186.3
237

170
3.50
6.50

54
4

301.5

227.5

Figure 1.5: TPC-1251H Dimensions

TPC-651H/1251H User Manual 8

 CHAPTER
2
2

System Setup
Chapter 2 System Setup
You can easily get TPC started by following the below steps.
• Step 1: Unpack the TPC package. Check the packing list at the begin-
ning of this manual to make sure all items have been included.

Figure 2.1: Unpack the Package

TPC-651H/1251H User Manual 10

• Step 2: Install a CompactFlash card containing Windows CE, embed-
ded Windows XP or another operating system.

Figure 2.2: Install CompactFlash Memory Card

Warning It is suggested to turn OFF system power as you

plug in or pull out the memory card, even though
the CompactFlash memory is hot swappable.

• Step 3: Connect the power connector to the 24 VDC power lines. The
power lines can either be of some power adapter or in-house power
source.

Figure 2.3: Power Connector and Power Lines

Figure 2.4: Power Receptor & Button Pin Assignment

11 Chapter 2
 • Step 4: Plug the power lines into the system power receptor.
• Step 5: Push the power button to power on the system (figure 2.4).
• Step 6: Calibrate the touchscreen (click "PM" in the bottom corner).

Note: If you want to install the touchscreen driver & use

the touchscreen utility, please refer the user
manual which is "PenMount 6000 Installation
Guide" in the CD-ROM.

Installing the Drivers

After installing your system software, you will be able to set up the Ether-
net, SVGA, and touchscreen functions. All drivers are stored in a CD-
ROM disc entitled “TPC-651H or TPC-1251H” which can be found in
your accessory box.
The various drivers in the CD-ROM disc have their own text files which
help users install the drivers and understand their functions. These files
are a very useful supplement to the information in this manual.

Note The drivers and utilities used for the TPC-651H and
TPC-1251H panel PCs are subject to change without
notice. If in doubt, check Advantech's website or contact
our application engineers for the latest information regard-
ing drivers and utilities.

TPC-651H/1251H User Manual 12

 CHAPTER
3
2

Features in
Windows XP
Embedded
Chapter 3 Features in Windows XP
Embedded
TPC-1250H supports the embedded Windows platform. This section out-
lines the important features (EWF and HORM), that are provided in Win-
dows XP embedded.

3.1 EWF

EWF stands for Enhanced Write Filter. It provides an upper filter in the
storage device driver stack that redirects disk write operations to volatile
(RAM) or non-volatile (disk) storage. EWF protects a volume from write
access. The benefits are as the following.
Write-protect one or more partitions on your system.
Enable read-only media, such as CD-ROM or flash, to boot and run.
Prolong the lifespan of write-sensitive storage, such as CompactFlash.

TPC-651H/1251H XPE provides EWF RAM RDG mode on system par-

tition. All wirte to system partition will be redirected to RMA once this
mode is enabled. This mode is manually enabled by customers after they
finish all their changes on system such as installing their applications or
adjusting system setting.

Advantech provides a pair of utilities to operate EWF, OSLock and

OSUnLock. The setting is stated in the section later.

TPC-651H/1251H User Manual 14

3.2 HORM

HORM stands for Hibernate Once Resume Many. In HORM environ-

ment, a single hibernation file is used to boot the system repeatedly. To
set a HORM environment, please follow the steps below.
Please make sure EWF is disabled. You can run OSUnLock to disable
EWF.
Enable hibernation support:
Run ‘power options’ in control panel, and then select ‘Enable Hiberna-
tion’ in hibernation pane.
Enable EWF:
Run OSLock, and then system reboot automatically.
Open those software that customers want to directly use after system
resume from hibernation.
Hibernate via Advantech HORM utility:
Please Click Start Menu->All Programs->Advantech->HORM

HORM environment remains all along unless the following events occur:
Run EWF commit command (ewfmgr c: -commit) and then reboot sys-
tem.
Select “Discard hibernation file” by clicking F8 when system is starting
up

Also, HORM cannot fit your system if free space in C partition is not
enough. The hibernation file required is dependent on the RAM size you
use on the system. In other words, the hibernation file is 512MB.

15 Chapter 3
TPC-651H/1251H User Manual 16
 A

APPENDIX
2

Serial Port Settings

Appendix A Serial Port Settings
A.1 COM1/ COM2 Connector Definition

1 5

6 9

Pin Signal
1 NDCD
2 NRX
3 NTX
4 NDTR
5 GND
6 NDSR
7 NRTS
8 NCTS
9 NRI

TPC-651H/1251H User Manual 18

A.2 RS-485 / RS-422 Setting

1. Choose integrated peripherals.

2. Choose serial port 2 mode.

19 Appendix A
3. Choose RS-485 or RS-422 for serial port and then save the
change.

TPC-651H/1251H User Manual 20

21 Appendix A
TPC-651H/1251H User Manual 22
 B

APPENDIX
2

Watchdog Timer
Programming
Appendix B Watchdog Timer
Programming
B.1 Overview

The TPC-1250H watchdog timer can be used to monitor system software

operation and take corrective action if the software fails to function after
the programmed period. This section describes the operation of the
watchdog timer, and how to program it.
The watchdog timer is built into the super I/O controller W83627DHG. It
provides the following functions for user programming:
• Can be enabled and disabled by user's program.
• Timer can be set from 1 to 255 seconds or 1 to 255 minutes.
• Generates an interrupt or resets signal if the software fails to reset the
timer after time-out.

TPC-651H/1251H User Manual 24

B.2 Watchdog Timer Programming

The I/O port address of the watchdog timer is 2E(hex) and 2F(hex), 2E
(hex) is the address port. 2F(hex) is the data port. You must first assign
the address of register by writing address value into address port 2E(hex),
then write/read data to/from the assigned register through data port 2F
(hex).

Unlock
UnlockW83627
W83627

Select
Selectregister
registerof
of
watchdog
watchdogtimer
timer

Enable
Enablethe
thefunction
functionof
of
the
the watchdogtimer
watchdog timer

Use
Usethe
thefunction
functionof
of
the
the watchdogtimer
watchdog timer

Lock
LockW83627HF
W83627HF

Figure B.1: Watchdog timer programming procedure

25 Chapter B
 Table B.1: Watchdog Timer Registers
Address of Attribute Description
register (2E)
Read/Write Value (2F)
and
description
87 (hex) ----- Write this address to I/O address
port 2E (hex) twice to unlock the
W83627HF
07 (hex) write Write 08 (hex) to select register of
watchdog timer.

30 (hex) write Write 01 (hex) to enable the function

of the watchdog timer. Disabled is
set as default.
F5 (hex) write Set seconds or minutes as units for
the timer.

Write 0 to bit 3: set second as counting unit. [default]

Write 1 to bit 3: set minute as counting unit
F6 (hex) write 0: stop timer [default]01~FF (hex):
The amount of the count, in seconds
or minutes, depends on the value
set in register F5 (hex). This number
decides how long the watchdog
timer waits for strobe before gener-
ating an interrupt or reset signal.
Writing a new value to this register
can reset the timer to count with the
new value.
F7 (hex) rd/wr Bit 6: Write 1 to enable keyboard to
reset the timer, 0 to disable.[default]
Bit 5: Write 1 to generate a timeout
signal immediately and automati-
cally return to 0. [default=0] Bit 4:
Read status of watchdog timer, 1
means timer is "time out".
AA (hex) ----- Write this address to I/O port 2E
(hex) to lock the watchdog timer.2

TPC-651H/1251H User Manual 26

B.3 Example Programs

1. Enable watchdog timer and set 10 sec. as timeout interval

;-----------------------------------------------------------
Mov dx,2eh ; Unlock W83627HF
Mov al,87h
Out dx,al
Out dx,al
;-----------------------------------------------------------
Mov al,07h ; Select registers of watchdog timer
Out dx,al
Inc dx
Mov al,08h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Enable the function of watchdog timer
Mov al,30h
Out dx,al
Inc dx
Mov al,01h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Set second as counting unit
Mov al,0f5h
Out dx,al
Inc dx
In al,dx
And al,not 08h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Set timeout interval as 10 seconds and start counting
Mov al,0f6h
27 Chapter B
 Out dx,al
Inc dx
Mov al,10
Out dx,al
;-----------------------------------------------------------
Dec dx ; lock W83627HF
Mov al,0aah
Out dx,al

2. Enable watchdog timer and set 5 minutes as timeout interval

;-----------------------------------------------------------
Mov dx,2eh ; unlock W83627H
Mov al,87h
Out dx,al
Out dx,al
;-----------------------------------------------------------
Mov al,07h ; Select registers of watchdog timer
Out dx,al
Inc dx
Mov al,08h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Enable the function of watchdog timer
Mov al,30h
Out dx,al
Inc dx
Mov al,01h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Set minute as counting unit
Mov al,0f5h

TPC-651H/1251H User Manual 28

Out dx,al
Inc dx
In al,dx
Or al,08h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Set timeout interval as 5 minutes and start counting
Mov al,0f6h
Out dx,al
Inc dx
Mov al,5
Out dx,al
;-----------------------------------------------------------
Dec dx ; lock W83627HF
Mov al,0aah
Out dx,al

3. Enable watchdog timer to be reset by mouse

;-----------------------------------------------------------
Mov dx,2eh ; unlock W83627H
Mov al,87h
Out dx,al
Out dx,al
;-----------------------------------------------------------
Mov al,07h ; Select registers of watchdog timer
Out dx,al
Inc dx
Mov al,08h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Enable the function of watchdog timer

29 Chapter B
 Mov al,30h
Out dx,al
Inc dx
Mov al,01h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Enable watchdog timer to be reset by mouse
Mov al,0f7h
Out dx,al
Inc dx
In al,dx
Or al,80h
Out dx,al
;-----------------------------------------------------------
Dec dx ; lock W83627HF
Mov al,0aah
Out dx,al

4. Enable watchdog timer to be reset by keyboard

;-----------------------------------------------------------
Mov dx,2eh ; unlock W83627H
Mov al,87h
Out dx,al
Out dx,al
;-----------------------------------------------------------
Mov al,07h ; Select registers of watchdog timer
Out dx,al
Inc dx
Mov al,08h
Out dx,al
;-----------------------------------------------------------

TPC-651H/1251H User Manual 30

Dec dx ; Enable the function of watchdog timer
Mov al,30h
Out dx,al
Inc dx
Mov al,01h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Enable watchdog timer to be strobed reset by keyboard
Mov al,0f7h
Out dx,al
Inc dx
In al,dx
Or al,40h
Out dx,al
;-----------------------------------------------------------
Dec dx ; lock W83627HF
Mov al,0aah
Out dx,al

5. Generate a time-out signal without timer counting

;-----------------------------------------------------------
Mov dx,2eh ; unlock W83627H
Mov al,87h
Out dx,al
Out dx,al
;-----------------------------------------------------------
Mov al,07h ; Select registers of watchdog timer
Out dx,al
Inc dx
Mov al,08h
Out dx,al

31 Chapter B
 ;-----------------------------------------------------------
Dec dx ; Enable the function of watchdog timer
Mov al,30h
Out dx,al
Inc dx
Mov al,01h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Generate a time-out signal
Mov al,0f7h
Out dx,al ;Write 1 to bit 5 of F7 register
Inc dx
In al,dx
Or al,20h
Out dx,al
;-----------------------------------------------------------
Dec dx ; lock W83627HF
Mov al,0aah
Out dx,al

TPC-651H/1251H User Manual 32

 C

APPENDIX
2

Watchdog Timer
Programming on
WinCE
Appendix C Watchdog Timer Program-
ming on WinCE
There is a built-in watchdog timer in Windows CE 6.0 for TPC. You can
access it through the WIN32 API. TPC provides a WDT driver to allow
users to enable/disable the watchdog timer. The driver name is “WDT1:”.
Programmers must open this driver before using the resources. Then pro-
grammers can use DeviceIOControl functions to enable/disable the
watchdog timer. The introduction below includes DeviceIOControl, the
definition of the parameter and an example.

C.1 DeviceIOControl

This function sends a control code directly to a specified device driver,

causing the corresponding device to perform the specified operation.

BOOL DeviceIoControl(
HANDLE hDevice,
DWORD dwIoControlCode,
LPVOID lpInBuffer,
DWORD nInBufferSize,
LPVOID lpOutBuffer,
DWORD nOutBufferSize,
LPDWORD lpBytesReturned,
LPOVERLAPPED lpOverlapped );

TPC-651H/1251H User Manual 34

C.1.1 Parameters
• hDevice
[in] Handle to the device that is to perform the operation. Call the Cre-
ateFile function to obtain a device handle.
• dwIoControlCode
[in] Specifies the control code for the operation. This value identifies
the specific operation to be performed and the type of device on which
the operation is to be performed. No specific values are defined for the
dwIoControlCode parameter. However, the writer of a custom device
driver can define IOCTL_XXXX control codes, per the CTL_CODE
macro. These control codes can then be advertised, and an application
can use these control codes with DeviceIoControl to perform driver-
specific functions.
• lpInBuffer
[in] Long pointer to a buffer that contains the data required to perform
the operation. This parameter can be NULL if the dwIoControlCode
parameter specifies an operation that does not require input data.
• nInBufferSize
[in] Size, in bytes, of the buffer pointed to by lpInBuffer.
• lpOutBuffer
[out] Long pointer to a buffer that receives the operation.s output data.
This parameter can be NULL if the dwIoControlCode parameter speci-
fies an operation that does not produce output data.
• nOutBufferSize
[in] Size, in bytes, of the buffer pointed to by lpOutBuffer.
• lpBytesReturned
[out] Long pointer to a variable that receives the size, in bytes, of the
data stored into the buffer pointed to by lpOutBuffer. The lpBytesRe-
turned parameter cannot be NULL. Even when an operation produces
no output data, and lpOutBuffer can be NULL, the DeviceIoControl
function makes use of the variable pointed to bylpBytesReturned.
After such an operation, the value of the variable is without meaning.
• lpOverlapped
[in] Ignored; set to NULL.
• Return Values
Nonzero indicates success. Zero indicates failure. To get extended
error information, call GetLastError.

35 Appendix C
C.2 How to Use the Control Code

There are 6 control codes for the operation codes in the WDT driver.

C.2.1 IOCTL _WDT_ENABLE:

Enables the watchdog timer of your application. By default, if the watch-
dog timer is enabled, the WDT driver will automatically trigger itself
after the specified period and your application does not need to trigger the
watchdog timer.
lpInBuffer: unused.
nInBufferSize: unused.
lpOutBuffer: unused.
nOutBufferSize: unused.

C.2.2 IOCTL _WDT_DISABLE:

Disables the watchdog time of your application.
lpInBuffer : unsed.
nInBufferSize: unused.
lpOutBuffer: unused.
nOutBufferSize: unused.

C.2.3 IOCTL_WDT_STROBE:
Triggers the watchdog. If your application uses IOCTL_WDT_ENABLE
to enable the watchdog first and then sends IOCTL_WDT_REBOOT to
the WDT driver, your application must trigger the watchdog once during
the watchdog timer period. If your application has not triggered at the
specified period, the device will reboot automatically.
lpInBuffer: unused.
nInBufferSize: unused.
lpOutBuffer: unused.
nOutBufferSize: unused.

TPC-651H/1251H User Manual 36

C.2.4 IOCTL_WDT_GETTIMEOUT:
Gets the Watchdog time setting.
lpInBuffer: unused.
nInBufferSize: unused.
lpOutBuffer: The DWORD points to your watchdog time setting. The
Watchdog time setting is just a number. 0 means 2 seconds, 1 means 5
seconds, 2 means 10 seconds, 3 means 15 seconds, 4 means 30 seconds, 5
means 45 seconds and 6 means 60 seconds. The default setting is 5 sec-
onds.
nOutBufferSize: unused.

C.2.5 IOCTL_WDT_SETTIMEOUT:
Sets the watchdog time setting.
lpInBuffer : The DWORD points to your watchdog time setting. The
watchdog time setting is just a number. 0 means 2 seconds, 1 means 5
seconds, 2 means 10 seconds, 3 means 15 seconds, 4 means 30 seconds, 5
means 45 seconds and 6 means 60 seconds. The default setting is 5 sec-
onds.
nInBufferSize:.unused.
lpOutBuffer: unused.
nOutBufferSize: unused.

C.2.6 IOCTL_WDT_REBOOT:
If you want your application to trigger the watchdog by itself, please use
IOCTL_WDT_REBOOT to notify the watchdog driver timer (WDT).
Otherwise, the WDT will trigger itself automatically.
lpInBuffer :unused.
nInBufferSize: unused.
lpOutBuffer: unused.
nOutBufferSize: unused.

37 Appendix C
C.3 Examples

#define WDT_CODE(ID)
CTL_CODE(FILE_DEVICE_UNKNOWN,ID,
METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_WDT_ENABLE WDT_CODE (0x900)
#define IOCTL_WDT_DISABLE WDT_CODE(0x901)
#define IOCTL_WDT_STROBE WDT_CODE(0x902)
#define IOCTL_WDT_GET_TIMEOUT WDT_CODE(0x903)
#define IOCTL_WDT_SET_TIMEOUT WDT_CODE(0x904)
#define IOCTL_WDT_REBOOT WDT_CODE(0x905)
// for compatibility reasons, you can define IOCTL as below:
// #define IOCTL_WDT_ENABLE 0x1001
// #define IOCTL_WDT_DISABLE 0x1002
// #define IOCTL_WDT_STROBE 0x1003
// #define IOCTL_WDT_GETTIMEOUT 0x1004
// #define IOCTL_WDT_SETTIMEOUT 0x1005
// #define IOCTL_WDT_REBOOT 0x1006
HANDLE m_hWDT=NULL;
TCHAR szClassName[60];
// assign the WDT driver name
wsprintf(szClassName, TEXT("WDT1:"));
// Open the WDT driver
m_hWDT = CreateFile(szClassName, GENERIC_READ
GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);
if ( m_hWDT == INVALID_HANDLE_VALUE ) {
DebugMsg(CString("WDT driver fail"));
return;
}
DWORD dwTemp;
DWORD nIndex=2;

TPC-651H/1251H User Manual 38

// Set the Watchdog Timer as 10 seconds. Number 2 means 10 seconds.
DeviceIoControl(m_hWDT, IOCTL_WDT_SET_TIMEOUT, &nIndex,
sizeof(nIndex), NULL, 0, &dwTemp, NULL);
// Enable the Watchdog timer
DeviceIoControl(m_hWDT, IOCTL_WDT_ENABLE, NULL, 0, NULL,
0, &dwTemp, NULL);
While (1) {
// do your job here.
Sleep(8000);
DeviceIoControl(m_hWDT, IOCTL_WDT_STROBE, NULL,0,
NULL, 0, &dwTemp, NULL);
}
DeviceIoControl(m_hWDT, IOCTL_WDT_DISABLE, NULL, , NULL,
0, &dwTemp, NULL);
CloseHandle(m_hWDT);

39 Appendix C
TPC-651H/1251H User Manual 40