HP manual 17 9112ContDmaStart

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5.17 _9112_ContDmaStart

uDescription

The function will perform A/D conversion continuous with DMA data transfer. It will takes place in the background which will not be stop until your program execute _9112_ContDmaStop() function to stop the process.

After executing this function, it is necessary to check the status of double buffer by using the function _9112_CheckHalfReady() and using _9112_DblBufferTransfer() to get the A/D converted data.

There is a group function for continuous A/D conversion using DMA as following:

_9112_ContDmaStart();

_9112_CheckHalfReady(); _9112_DblBufferTransfer(); _9112_GetOverrunStatus(); _9112_ContDmaStop();

uSyntax

Visual C++ (Windows-95)

int W_9112_ContDmaStart (int card_number, int auto_scan, int ad_ch_no, int ad_range, int count, HANDLE memID, int c1, int c2)

Visual Basic (Windows-95)

W_9112_ContDmaStart (ByVal card_number As Long, ByVal auto_scan As Long, ByVal ad_ch_no As Long, ByVal ad_range As Long, ByVal

count As Long, ByVal memID As Long, ByVal c1 As Long ByVal c2 As Long) As Long

C/C++ ( DOS)

int _9112_ContDmaStart (int card_number, int auto_scan, int ad_ch_no, int ad_range, int count , int *db_buffer, int c1, int c2)

uArgument

card_number : the card number of PCI-9112

auto_scan : TRUE or FALSE

Example1 : auto_scan is FALSE, ad_ch_no is 3. Using DMA mode to read A/D data only channel 3.

Example2 : auto_scan is TRUE, ad_ch_no is 3. Using DMA mode to read A/D data with multi-channel, channel 3, 2, 1 and 0. Reading sequence is channel 3,2,1,0, 3,2,1,0,3,2,1,0....

ad_ch_no : A/D channel number

ad_range : A/D analog input range, please refer to the section 4.3.8 for the possible values.

count : the number of A/D conversion

db_buffer(DOS): the start address of the circular buffer to store the

C/C++ Library ∙ 55

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Contents Page Trademarks ALL Rights ReservedAdlink Technology Inc Detailed Company InformationQuestions Page Contents 9112DblBufferTransfer 9112GetOverrunStatus ConversionConversion Digital Input and Output 9112DO 9112DA 9112ADSetChannel 9112ADSetRangePCI Scan Utility Appendix A. Demo. Programs Product Warranty/ServiceWhat do you need VR Assignment Adjustment Software UtilitiesHow to Use This Guide Features T r o d u c t i o nIntroduction ∙ Analog Output D/A SpecificationsApplications Analog Input A/DGeneral Specifications Digital I/O DIOProgrammable Counter Software Supporting Programming LibraryPCIS-LVIEW LabVIEW Driver PCIS-DDE DDE Server and InTouchTM PCIS-VEE HP-VEE DriverDAQBenchTM ActiveX Controls DASYLabTM PROInstallation ∙ InstallationWhat You Have Device Installation for Windows Systems Installation ∙Unpacking PCI -Bus Controller PCB LayoutPCI-9112 Layout ConverterPCB Layout of the PCI-9112 CPCI-9112 LayoutJumper Settings Analog Input Channel Configuration10 ∙ Installation D/A Reference Voltage Setting Clock Source Setting12 ∙ Installation Internal Reference Voltage SettingConnectors Pin Assignments CN 3 Analog Input / Output & Counter/TimerPin Assignments of PCI-9112 CN 1 Digital Signal Input DI 0 CN 2 Digital Signal Output do 014 ∙ Installation Pin Assignments of cPCI-9112 16 ∙ Installation Hardware Installation OutlineConnect with ACLD-9182 Daughter Board ConnectionConnect with ACLD-8125 Connect with ACLD-913718 ∙ Installation Connect with ACLD-9185Connect with ACLD-9138 and ACLD-9188 G i s t e r s F o r m a t I/O Registers MapRegisters Format ∙ 20 ∙ Registers Format A/D Data RegistersD/A Output Register A/D control Register Mode22 ∙ Registers Format MUX Register Bit8 ~ Bit5 Auto-Scan Bit24 ∙ Registers Format Software Trigger Register A/D Status Register26 ∙ Registers Format Digital I/O registerInternal Timer/Counter Register High Level ProgrammingLow Level Programming 28 ∙ Operation Theorem Analog Input Signal ConnectionE r a t i o n T h e o r e m A/D ConversionSingle-ended Mode Differential input modeOperation Theorem ∙ 30 ∙ Operation Theorem 4 Floating source and differential inputSoftware trigger 1 A/D Conversion ProcedureTimer Pacer Trigger 2 A/D Trigger ModesInterrupt Transfer Intx 3 A/D Data Transfer ModesExternal Trigger Software Data Transfer DrdyDMA Transfer Dmax D/A Conversion34 ∙ Operation Theorem Digital Input and OutputCounter Timer/Counter Operation36 ∙ Operation Theorem General Purpose Timer/ CounterPacer Trigger Source AddressControl Byte 38 ∙ Operation Theorem Mode DefinitionsLibraries Installation + + L i b r a r y++ Library ∙ 40 ∙ C/C++ Library Programming GuideNaming Convention Data TypesReturn Code 9112InitialSyntax Argument42 ∙ C/C++ Library 9112DI9112DI Channel Description9112DO 44 ∙ C/C++ Library 9112DA9112ADSetChannel 46 ∙ C/C++ Library 9112ADSetRangeCardnumber the card number of PCI-9112 10 9112ADSetMode48 ∙ C/C++ Library 11 9112ADSetAutoscan12 9112ADSoftTrig 50 ∙ C/C++ Library 13 9112ADAquire14 9112ADDMAStart 52 ∙ C/C++ Library 15 9112ADDMAStatus 54 ∙ C/C++ Library 16 9112ADDMAStop17 9112ContDmaStart 56 ∙ C/C++ Library 18 9112CheckHalfReady20 9112GetOverrunStatus 19 9112DblBufferTransfer58 ∙ C/C++ Library 21 9112ContDmaStop22 9112ADINTStart 60 ∙ C/C++ Library 23 9112ADINTStatus24 9112ADINTStop 25 9112ADTimer62 ∙ C/C++ Library 2MHz / c1 * c227 9112TIMERRead 26 9112TIMERStart64 ∙ C/C++ Library 28 9112TIMERStop29 9112AllocDMAMem Argument cardnumber countervalue32 9112GetSample 30 9112FreeDMAMem66 ∙ C/C++ Library Calibration What do you needCalibration ∙ Unipolar Calibration A/D AdjustmentVR Assignment Bipolar CalibrationD/A Adjustment Reference Voltage Calibration2 D/A Channel Calibration Software Utilities Software Utility70 ∙ Software Utility Software Utility ∙ System ConfigurationRunning the Utility CalibrationFunctional Testing PCI Scan Utility72 ∙ Software Utility Appendix a Demo Programs ∙ P e n d i x a . D e m o O g r a m sDOS Software Windows 95 DLL74 ∙ Appendix a Demo Programs Product Warranty/Service ∙ Product Warranty/Service