Windows Driver Manual - RTD Embedded Technologies, Inc.
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1. Description This routine sets the user timer counter Parameters hBoard device handle Timer 0 1 2 InputRate Input clock to selected timer OutputRate Desired output rate from selected timer Returns The actual clock frequency that is programmed DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 28 Example Programs Reference Win32 Windows applications Digital_IT Timer_IT Timers 29 Sample program that demonstrates how to program digital I O Sample program that demonstrates how to use the P1 0 input as an interrupt source and how to write an Interrupt Service Routine ISR Sample program that demonstrates how to use the timer as an interrupt source and how to write an Interrupt Service Routine ISR Sample program that demonstrates how to program the user timer Sample program that demonstrates how to read and write the digital I O The program sets Ports 0 and 1 as outputs The rest of the ports are set as inputs The program constantly displays the value of the lines on the input port in the center of the screen You can enter a value to be sent to the output port Wiring the input port lines to the corresponding output port lines will allow you to change the output lines and view the changes at the same time Sample program that demonstrates how to read and write the digital I O using interrupts The program sets Port 0 as output The rest of the ports are set as inputs This program2. EnableBoardIRQ6810 void EnableBoardIRQ6810 RTDHANDLE hBoard uchar8 Enable Description This routine enables the board IRQ for the DM6810 Parameters hBoard device handle Enable 0 disabled 1 enabled EnableIrqSharing6810 void EnableIRQSharing6810 RTDHANDLE hBoard uchar8 Enable Description This routine enables and disables the interrupt sharing feature of the board Parameters hBoard device handle Enable 2 Disabled 0 Enabled 21 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP GetErrorStatus6810 G BOOL GetErrorStatus6810 RTDHANDLE hBoard LONG ErrorCode LPSTR ErrorString Description This routine is used to get the error code and string in case of errors The function clears the last error code Parameters hBoard device handle ErrorCode Error Code ErrorString Return error string Return Value TRUE iferror occurred FALSE otherwise GetIRQCounter6810 void GetIRQCounter68 10 RTDHANDLE hBoard IRQSetup irqsetup Description This routine is used to get the counter incremented by IRQ Parameters hBoard device handle irqsetup return parameters to caller DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 22 InitBoard6810 void InitBoard6810 RTDHANDLE hBoard Description This routine should always be called first This clears the board and variables the driver uses Parameters hBoard device handle InstallCallbackIRQHandler68 10 BOOL InstallCallbackIRQHandler6810
3. RTDHANDLE hBoard isr_t handler Description This routine is used to install IRQ handler function Parameters hBoard device handle isrT handler user callback function Return value TRUE on success FALSE on error InstallCounterIRQHandler6810 BOOL InstallCounterIRQHandler6810 RTDHANDLE hBoard IRQSetup irqsetup Description This routine is used to install IRQ handler function Parameters hBoard device handle irqsetup return parameters to caller Return value TRUE on success FALSE on error IsEPLDIIRQ6810 ISEPLD2IRQ6810 ISEPLD3IRQ6810 uchar8 ISEPLDIIRQ6810 RTDHANDLE hBoard uchar8 ISEPLD2IRQ6810 RTDHANDLE hBoard 23 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP uchar8 ISEPLD3IRQ6810 RTDHANDLE hBoard Description This routine checks the EPLD1 EPLD2 EPLD3 IRQ status bit Parameters hBoard device handle Returns 1 if IRQ has been generated 0 if no IRQ IsP14IRQ6810 uchar8 ISPI4IRQ6810 RTDHANDLE hBoard Description This routine checks the P14 IRQ status bit Parameters hBoard device handle Returns 1 if IRQ has been generated 0 if no IRQ DM6810 DM6910 Driver for Windows 98 NT4 2000 XP LoadIRQRegister68 10 void LoadIRQRegister6810 RTDHANDLE hBoard uchar8 Value Description This routine loads the interrupt register with one write operation Parameters hBoard device handle Value 0 7 25 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP OpenBoard68 10 BOOL OpenBoa
4. board the installation program generates the file wrtdev txt in the Examples directory containing the actual device number The example programs are reading this file at the startup to identify this number If the other board in your system which uses the WinRT driver does not handle the situation when there is other WinRT based application install this board firstly and then install the DM6810 which handles correctly this state DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 8 Using Windows registry keys The RTD board drivers are using the next registry keys Windows NT 4 0 HKEY_LOCAL_MACHINE System CurrentControlSet Services WinRT WinRTdev0 one per device Parameters SectionO WinRTdev1 Parameters 5 Windows 98 Enum key path HKEY_LOCAL_MACHINE Enum Windows 98 Class key path HKEY LOCAL MACHINE System CurrentControlSet Services Class WinRTDevices DM6810 DM6910 Driver for Windows 98 NT4 2000 XP Windows 2000 XP device class information HKEY_LOCAL_MACHINE System CurrentControlSet Control Class D695ED6A 630D 4D83 D8B F1FOAC107AD0 0001 Windows 2000 XP Plug and Play devices are enumerated under the Enum key HKEY_LOCAL_MACHINE System CurrentControlSet Enum DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 10 The Driver API Funct
5. programmable interval timer PIT Parameters hBoard device handle Timer 0 1 2 Mode 0 1 2 3 4 5 CloseBoard6810 BOOL CloseBoard6810 LONG DeviceNumber LPSTR szBuf Description 15 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP This routine is used to close board driver Parameters DeviceNumber WinRT device number to load szBuf message buffer Return value TRUE on success FALSE on error DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 16 DIOClearChip68 10 void DIOClearChip6810 RTDHANDLE hBoard uchar8 Chip Description This routine clears the selected DIO chip Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board DIOClearIRQ6810 void DIOClearIrq68 10 RTDHANDLE hBoard uchar8 Chip Description This routine clears the selected DIO chips IRQ status bit Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board DIOEnableIRQ6810 void DIOEnablelIrq6810 RTDHANDLE hBoard uchar8 Chip uchar8 Enable Description This routine enables the selected DIO chips interrupt Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board Enable 0 Disabled 1 Enabled DIOIsChipIRQ6810 uchar8 DIOIsChiplrq6810 RTDHANDLE hBoard uchar8 Chip Description This routine checks to see if the selected DIO chip has generated an interrupt Parameters 17 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP hBoard device hand
6. 13 DIGITALE VO FUNCTIONS nne meret oe ah wean a RS en e ETE EE TRE TER 13 INTERRUPT HANDLEING 13 USER TIMER COUNTER FUNCTIONS essere ere rdr e osse rsrsr esses reservere 13 ERROR HANDLING PUNO ON O a a e e E r Eo EEE ESEESE 14 ALPHABETICAL DRIVER API FUNCTIONS REFERENCE eee eee eerte nannten 15 EXAMPLE PROGRAMS REFERENCE e eeee eee ee ee eee ette ene seen ee seen aee e ena 29 WIN32 WINDOWS APPLICATIONS cc0ccseeeeseseeeseseseseseseseseseseseseseseseseseseseseseseseseseseseseseseseseseeees 29 LIMITED WARRANTY issssccscstecvessesececessiieieiesccsvenccdetvennascacbecseevebessdevesssbusvaseasestcbseusoxessbseavonses 30 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP iv Introduction The DM6810 DM6910 board driver for Windows 98 NT4 2000 XP was designed for programmers who write Windows based application programs for the RTD s DM6810 or DM6910 board DM6810 and DM6910 are the same boards with different interface connector Later we will refer both boards as DM68 10 The driver provides an Application Programming Interface with a lot of function calls to perform all the data acquisition tasks of the board users The board driver based on the BlueWater System s WinRT device driver kit There are example programs to demonstrate the various board features and the usage of the driver API The example programs are written in Microso
7. ANTIES INCLUDING IMPLIED WARRANTIES FOR MECHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED TO THE DURATION OF THIS WARRANTY IN THE EVENT THE PRODUCT IS NOT FREE FROM DEFECTS AS WARRANTED ABOVE THE PURCHASER S SOLE REMEDY SHALL BE REPAIR OR REPLACEMENT AS PROVIDED ABOVE UNDER NO CIRCUMSTANCES WILL RTD Embedded Technologies BE LIABLE TO THE PURCHASER OR ANY USER FOR ANY DAMAGES INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES EXPENSES LOST PROFITS LOST SAVINGS OR OTHER DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PRODUCT SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR CONSUMER PRODUCTS AND SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 30 RTD Embedded Technologies Inc 103 Innovation Blvd State College PA 16803 0906 USA Our website www rtd com 31 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP
8. DM6810 DM6910 Driver for Windows 98 NT4 2000 XP User s Manual version 4 0 N IM i 72227 RTD Embedded Technologies Inc Real Time Device Accessing the Analog World Jo SWM 640010005 Rev B 1509001 and AS9100 Certified 8 RTD Embedded Technologies INC 103 Innovation Blvd State College PA 16803 0906 Phone 1 814 234 8087 FAX 1 814 234 5218 E mail sales rtd com techsupport rtd com web site http www rtd com DM6810 DM6910 Driver for Windows 98 NT4 2000 XP ii Revision History 08 19 2003 Revision A issued Documented for ISO9000 09 19 2003 Revision B issued Version 4 0 released Company name changed Windows 2000 XP support added Windows 95 support removed All function and files names 5810 changed to 6810 fixed a bug in the function RemoveIRQHandler6810 interface of the following function changed OpenBoard6810 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP Published by RTD Embedded Technologies Inc 103 Innovation Blvd State College PA 16803 0906 Copyright 1999 2002 2003 by RTD Embedded Technologies Inc All rights reserved Printed in U S A The RTD Logo is a registered trademark of RTD Embedded Technologies cpuModule and utilityModule are trademarks of RTD Embedded Technologies PS 2 PC XT PC AT and IBM are trademarks of International Business Machines Inc MS DOS Windows Windows 98 Windows NT Windows 2000 and Windows XP are t
9. RTDHANDLE hBoard uchar8 Chip uchar8 IRQSource Description This routine sets the selected DIO chips interrupt source Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board IRQSource 0 15 P0 0 P1 7 DIOSetPortODirection6810 DIOSetPort1 Direction6810 void DIOSetPortODirection6810 RTDHANDLE hBoard uchar8 Chip uchar8 Direction void DIOSetPort1Direction6810 RTDHANDLE hBoard uchar8 Chip uchar8 Direction Description This routine sets the selected DIO chips port 0 1 direction Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board Direction 0 255 0 1 Out 19 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP DIOStrobeEnable68 10 void DIOStrobeEnable6810 RTDHANDLE hBoard uchar8 Chip uchar8 Enable Description This routine enables the strobe input of the selected DIO chip Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board Enable 0 Disabled 1 Enabled DIOWrite68 10 void DIOWrite6810 RTDHANDLE hBoard uchar8 Chip uchar8 Port uchar8 Data Description This routine writes the selected DIO chips port Parameters hBoard device handle Chip 0 1 2 Port 0 1 Data 0 255 DoneTimer6810 void DoneTimer6810 RTDHANDLE hBoard Description Initialize the timers for high speed to ensure the immediate load Parameters hBoard device handle DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 20
10. bleBoardIRQ6810 EnableIrqSharing68 10 InstallCallbackIRQHandler68 10 InstallCounterIRQHandler6810 RemoveIRQHandler68 10 GetIRQCounter6810 LoadIRQRegister68 10 ReadBoardIRQStatus6810 SetIRQPolarity6810 IsEPLD 1IRQ6810 IsEPLD2IRQ6810 IsEPLD3IRQ6810 IsP14IRQ6810 DIOClearIrq68 10 DIOEnablelrq6810 DIOSetIRQSource6810 DIOIsChipIRQ6810 User Timer Counter Functions ClockDivisor6810 ClockMode6810 DoneTimer6810 ReadTimerCounter6810 SetUserClock6810 13 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP Error Handling Functions GetErrorStatus68 10 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 14 Alphabetical Driver API Functions Reference ClearBoardIRQ6810 void ClearBoardIRQ6810 RTDHANDLE hBoard Description This routine is used to clear the board IRQ circuitry and status bit Parameters hBoard device handle ClockDivisor6810 void ClockDivisor6810 RTDHANDLE hBoard uchar8 Timer uint16 Divisor Description This routine is used to set the divisor of a designated counter on the 8254 programmable interval timer PIT This procedure assumes that the counter has already been set to receive the least significant uchar8 LSB of the divisor followed by the most significant uchar8 MSB Parameters hBoard device handle Timer 0 1 2 Divisor 0 65535 ClockMode6810 void ClockMode6810 RTDHANDLE hBoard uchar8 Timer uchar8 Mode Description This routine is used to set the mode of a designated counter in the 8254
11. cfg exe program in Windows NT4 0 In case of Windows 98 2000 XP the operating system uses a WDM driver and it can be configured in the Control Panel System Hardware Device Manager The Driver Configuration As in the previous chapter mentioned after installing the driver the default settings are used If these settings are not proper to your PC configuration or there are other RTD boards used you can modify the settings Under Windows NT driver can be configured with the Drvr cfg exe program This program is installed on your PC during the setup process and it can be started from the Start menu Program options Device number The number of device which handles the board Each board has a unique device number between 0 and 9 I O port base address The I O base address of the board IRQ number The IRQ number using of the board DMA channel The DMA channel using of the board DMA buffer size The DMA buffer size It should not be more than 64k Register Press this button to store the settings in the Windows registry Refresh Press this button to get the information from the registry about the selected device number Under Windows 98 2000 XP same changes can be made using Control Panel System Hardware Device Manager WinRT Devices 7 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP Do not forget that all boards are required different driver devices and in your C program must be used the DEVICE_NO accordi
12. ft Visual C ver 6 0 Installation Installation of the Driver and Example Programs Before installing the driver and example program files you need to install the DM6810 board in your PC Please follow the instructions of the manufacturer how to install the board in a computer To install the drivers for the DM6810 under Windows 98 2000 XP you need the installation diskette 0 The readme txt file on this diskette describes the necessary installation steps For Windows NT4 0 the installation diskette 0 is not needed On the installation diskette 1 you can found the Setup exe program which installs on your PC the DM6810 board driver and example programs The setup program automatically detects your operating system and installs the appropriate files on your PC After starting the setup please follow the instructions on the screen to install the programs You can select the directory where to install the files The setup also adds to the Start menu under the Programs folder of your Windows system the RTD Embedded Technologies folder It contains shortcuts to the example programs the driver configuration utility and the readme txt file The example programs will be installed in the target directory under the Examples folder This folder contains the example program sources for the DM6810 board and the project files for Microsoft Visual C users to rebuild the programs The example programs are compiled with the M
13. icrosoft Visual C ver 6 0 In case of different version of Visual C is installed on your PC please rebuild the executable files Uninstallation you can uninstall the DM6810 driver and example programs under the Control panel with the Add Remove Programs tool DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 6 The DM6810 board driver The RTD s DM6810 board driver handles the hardware through the BlueWater s WinRT driver The WinRT driver provides the low level access to the board and the RTD s Drvr6810 dll provides the device API for the programmers and communicates with the hardware through the WinRT driver The RTD board drivers has multi board feature It means that it is possible to use more than one board in the system The base address of the DM6810 board can be set by DIP switch If you are using multiple boards in your system you need assign a different base address to each board The IRQ and DMA channels are set programmatically When you install a WinRT driver for the board you must select the IRQ and DMA channel and during the operating of the board must be used this IRQ and DMA channels Each board requires a unique WinRT device to handle the hardware The maximum number of devices is 32 During the installation the Setup exe program set the default driver values Board 1 0x300 base address and IRQ 11 If these settings are not proper to your PC configuration you can modify the settings with the Drvr
14. ions The resources on the DM6810 board can be accessed from Windows through the driver API Application Programming Interface functions The executable code of these functions is located in the Drvr6810 dll file To write applications using the API functions you must include the Reg6810 H header file and link the program with the Drvr6810 lib import library file In the example programs you can find different examples how to use the driver 11 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP Using the Driver without the Windows GUI This driver is based on the Win32 system and can run only under Windows However the user who is not familiar with the Windows Graphical User Interface can use the driver API functions in Win32 console applications which has an MS DOS like text mode interface In console applications is not necessary to use the Windows graphical environment but all the driver s API functions are accessible The Microsoft Visual C compiler supports writing console applications DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 12 Driver API Function Groups Driver Initialization Functions OpenBoard68 10 CloseBoard6810 General Board Control Functions InitBoard6810 Digital Functions DIOClearChip68 10 DIORead6810 DIOWrite6810 DIOSelectClock6810 DIOStrobeEnable6810 DIOIsChipStrobe6810 DIOSelectRegister6810 DIOSetPortODirection6810 DIOSetPortl Direction6810 Interrupt Handling ClearBoardIRQ6810 Ena
15. le Chip 0 1 2 selects which DIO chip on board Returns 1 if IRQ has been generated 0 if no IRQ DIOIsChipStrobe68 10 uchar8 DIOIsChipStrobe6810 RTDHANDLE hBoard uchar8 Chip Description This routine checks to see if the selected DIO chip has received strobe input Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board Returns 1 if strobe has been received 0 if no strobe DIORead6810 uchar8 DIORead6810 RTDHANDLE hBoard uchar8 Chip uchar8 Port Description This routine reads the selected DIO chips port Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board Port 0 1 Returns 8 bit unsigned character value DIOSelectClock6810 void DIOSelectClock6810 RTDHANDLE hBoard uchar8 Chip uchar8 Clock Description This routine picks the different registers on the selected DIO chip Parameters DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 18 hBoard device handle Chip 0 1 2 selects which DIO chip on board Clock 0 8 MHz 1 Programmable clock DIOSelectRegister6810 void DIOSelectRegister68 10 RTDHANDLE hBoard uchar8 Chip uchar8 Select Description This routine picks the different registers on the selected DIO chip Parameters hBoard device handle Chip 0 1 2 selects which DIO chip on board Select 0 Clear mode 1 Port 0 direction 2 Port 1 direction 3 IRQ source DIOSetIRQSource68 10 void DIOSetIRQSource68 10
16. ng to the driver device number Installing a second board in the system It is possible to use more than one board in the system using the RTD s board drivers Please follow the next steps to install a multi board system nstall the first board with all software and make sure that everything is working well Place the second board in an empty slot in the PC and switch on the computer Windows NT4 0 After the system startup start the installation program and answer YES to the next board installation question Restarting the system with the two board example program is possible to test the working of both boards Please note that during the second board installation the driver and example program files will be refreshed thus you need to save the important changes before starting the install Windows 98 2000 XP You need only the installation diskette O to install the next boards Follow the steps described in the readme txt file on diskette 0 Working with Other Boards Using the WinRT Driver As you may have in your computer other RTD boards which uses the WinRT driver or a board from other manufacturer with WinRT our installation program automatically detects the WinRT settings from the system registry file and installs the appropriate next WinRT device You can see an informational dialog box about this issue during the setup As an application written for the DM6810 board should know which WinRT device is assigned to the
17. rademarks of Microsoft Corp PC 104 is a registered trademark of PC 104 Consortium other trademarks appearing in this document are the property of their respective owners iii DM6810 DM6910 Driver for Windows 98 NT4 2000 XP Table of Contents TABLE OF CONTENTS si ccscccssscadscsevssccssscsccceversacessenccstessuasseasecesivenseossedbascestesaeesetsdeetanseodsestescestnc 4 INTRODUCTION o 5 INSTALLATION eer E 6 INSTALLATION OF THE DRIVER AND EXAMPLE PROGRAMS eere n n nen nennen nnne nnn nean 6 THE DM6810 BOARD DRIVER eee eene 7 THE DRIVER CONFIGURATION risus nnn nnn nnn nnn nn nnn nnn nnn annee saspe n nnn n panneau 7 INSTALLING A SECOND BOARD IN THE SYSTEM eee eene nene nen ener nnn nn nnne nana enun 8 WORKING WITH OTHER BOARDS USING THE WINRT DRIVER eee 8 USING WINDOWS REGISTRY nnne enhn n nnne n nnn nsn annee enn pna pae eee 9 THE DRIVER API FUNCTIONS ess een noo oo eaae eo pano eaa roo tra rane ebore o Ubros o PE aas o e un eae see 11 USING THE DRIVER WITHOUT THE WINDOWS GVUI eee eese ee eese ense seen ee eetnuo 12 DRIVER API FUNCTION GROUPS eere ee eee ee eese eno e setae see ease esse esse sese esse essens a 13 DRIVER INITIALIZATION FUNCTIONS eee 13 GENERAL BOARD CONTROL FUNCTIONS eee eene n enes ener nnn nnn ener ener aane nana
18. rd6810 int num int device id LPSTR szBuf BoardConfig boardconfig Description This routine is used to open board driver Parameters num the number of the board a system can have more board device id 0x6810 szBuf return string BoardConfig pointer to return board configuration Return value TRUE on success FALSE on error DM6810 DM6910 Driver for Windows 98 NT4 2000 XP 26 ReadBoardIRQStatus6810 uchar8 ReadBoardIRQStatus6810 RTDHANDLE hBoard Description This routine returns the IRQ status from the board Parameters hBoard device handle Returns 8 bit unsigned integer ReadTimerCounter6810 uint16 ReadTimerCounter6810 RTDHANDLE hBoard uchar8 Clock Description This routine is used to read the contents of the selected timer counter Parameters hBoard device handle Clock 0 1 2 Returns 16 bit count value RemoveIRQHandler68 10 void RemoveIRQHandler6810 RTDHANDLE hBoard Description This routine is used to uninstall IRQ handler function Parameters hBoard device handle 27 DM6810 DM6910 Driver for Windows 98 NT4 2000 XP SetIRQPolarity6810 void SetIRQPolarity6810 RTDHANDLE hBoard uchar8 Polarity Description This routine sets the P14 interrupt to use the positive edge or negative edge Parameters hBoard device handle Polarity 0 positive edge 1 negative edge SetUserClock6810 float32 SetUserClock6810 RTDHANDLE hBoard uchar8 Timer float32 InputRate float32 OutputRate
19. sets up the P2 0 input to generate interrupts An interrupt service routine ISR is provided that simply sends a value out the output ports and reads a value from the input ports The values are displayed on the screen as a foreground process Although the ISR in this program is trivial all the ingredients for powerful interrupt driven data acquisition are included The timer is programmed to run at the specified rate If you connect the output from timer counter 2 to P2 0 interrupts will be generated at the timer rate Sample program that demonstrates how to read and write the digital I O using interrupts The program sets Ports 0 and 1 as outputs The rest of the ports are set as inputs This program sets up the User Timer to generate interrupts at a selected rate An interrupt service routine ISR is provided that simply sends a value out the output ports and reads a value from the input ports The values are displayed on the screen as a foreground process Although the ISR in this program is trivial all the ingredients for powerful interrupt driven data acquisition are included Sample program demonstrating how to program the 8254 programmable interval timers PITs Counter 0 is programmed to run at 200 Hz Counter 1 is used to count these pulses The result is converted into seconds and printed on the screen DM6810 DM6910 Driver for Windows 98 NT4 2000 XP Limited Warranty RTD Embedded Technologies Inc warrants the hard
20. ware and software products it manufactures and produces to be free from defects in materials and workmanship for one year following the date of shipment from RTD Embedded Technologies INC This warranty is limited to the original purchaser of product and is not transferable During the one year warranty period RTD Embedded Technologies will repair or replace at its option any defective products or parts at no additional charge provided that the product is returned shipping prepaid to RTD Embedded Technologies All replaced parts and products become the property of RTD Embedded Technologies Before returning any product for repair customers are required to contact the factory for an RMA number THIS LIMITED WARRANTY DOES NOT EXTEND TO ANY PRODUCTS WHICH HAVE BEEN DAMAGED AS A RESULT OF ACCIDENT MISUSE ABUSE such as use of incorrect input voltages improper or insufficient ventilation failure to follow the operating instructions that are provided by RTD Embedded Technologies acts of God or other contingencies beyond the control of RTD Embedded Technologies OR AS A RESULT OF SERVICE OR MODIFICATION BY ANYONE OTHER THAN RTD Embedded Technologies EXCEPT AS EXPRESSLY SET FORTH ABOVE NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT NESS FOR A PARTICULAR PURPOSE AND RTD Embedded Technologies EXPRESSLY DISCLAIMS ALL WARRANTIES NOT STATED HEREIN ALL IMPLIED WARR
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