Interrupt Service Routines in Labview

Hi
I would like to write some Interrupt Service Routines, is it possible to
do this in labview (running in Windows 95)?
I would like to be able to attend the interrupts i receive from a custom
ISA card (not supported by NI).
Thanks
Eduardo
Eduardo Aldaz Carroll, tel: +41 22 7679153
CERN, PS Division fax: +41 22 7678510
CH-1211 Geneva 23, Switzerland.

From what I know NI has not developed sub VI's for LabView to accomplish this task. If you have a driver for the card in the form of a DLL then you can use a Call Library Function to interface with the card.
Chris_Mitchell
Product Development Engineer
Certified LabVIEW Architect

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Developing a LabVIEW Real-Time Driver for a PXI or Compact PCI Device
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Christian Loew, CLA
Principal Systems Engineer, National Instruments
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How do I create an interrupt on the PCI-DIO-96 from an external signal connected to the lines PC0 or PC3 of a port?

Hi everybody,
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e lines PC0 or PC3 of a PPI. We've simulated the signal low-to-high transition with an external voltage source connected to the line PC0. We actually saw in the memory that the line toggled from state low to state high, but no interrupt was generated. I don't have a guess what I am doing wrong. Perhaps anybody knows the solution of this problems.
Thanks and best regards.
Sven Jungnickel

You may want to try disabling your USB or IEEE-1394 host controller. It's possible that one of these devices could be on the same interrupt as you DIO-96 and causing the interrupt to not be serviced.
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Havng gone through some documentation on interrupt, kernel level threads etc in WDF, I got a couple of questions:
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2) What exactly is the difference between thread preemption and thread interrupt? Doesnt both mean stopping the current thread and putting it aside?
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go for kernel dispatcher object?
6) How can timers be used for kernel level synchronisation? How different is this from timers created using WdfTimerCreate()?
7) It is said that "Never wait on a kernel dispatcher object in any driver routine that can be called at IRQL>=DISPATCH_LEVEL.". Does it mean
we should not use synchronisation mechanisms in this level? Or if we can use, should the thread try to acquire a lock with a zero wait time? And proceed if it could acquire the lock and return if the lock was not acquired?
8) I understand that in order to execute an interrupt, a driver does not create any special threads but use a thread that happens to be running at the moment( arbitrary thread ) . My question is, in what way is this accomplished? What aspect of the arbitrary
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To answer the questions:
#1   An interrupt service routine (ISR) running a lower IRQL may be interrupted by another ISR running at a higher level.
#2   Having never heard of a thread interrupt, all I can say here is that a thread may be pre-empted for a lot of reasons.
#3   An ISR does not have to schedule a DPC unless it needs to do work that it cannot do at high IRQL.
#4   Assuming that the Write and IOCTL are on seperate queues, yes you need a a lock to protect shared resources.
#5   As the name implies kernel dispatcher objects allow scheduling (i.e. dispatching of another thread), while things like spinlocks do not.
#6    Timers are just another dispatching object, i.e. one can wait on them the same way one waits on a mutex or a semaphore. A WDF TIMER is basically a wrapper around a regular timer to take care of some of the housekeeping (particularily
with respect to stopping the driver etc)
#7     If a routine is running at DISPATCH_LEVEL you are limited to spin locks for synchronization. You can with a zero timeout check the status of a kernel dispatcher object.   In general, routines like this should be
designed to only use spinlocks.
#8    An arbitrary thread is just that, it may be a thread in any process. Basically a currently running thread is grabed and used to run the interrupt so that the scheduler which has overhead and is not designed to run at interrupt level
IRQL's does not need to run.
Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com Blog: http://msmvps.com/blogs/WinDrvr

Blackfin UART Interrupt/Callback for receiving data

Hi,
I am having trouble structuring a simple program to receive data from the Blackfin UART1. Data is received over the UART1 every second, so I'm planning on creating an interrupt service routine to read in the data and store it to a global string array . After reading the following page on Blackfin callbacks,
http://zone.ni.com/devzone/cda/tut/p/id/3244
I believe this is the general way I should approach the problem:
Main VI:
- Static VI reference that references the UART interrupt service routine VI
- Static VI reference connects to BF UART Open block, BF UART Control block, then to the UART interrupt service routine
- Global string array indicator
UART interrupt service routine VI:
- UART Read block with the output buffer appending string to a global string array
This is not working--the global string array does not update. I have been able to read the data through the UART1 in another VI, but this was not triggered by an interrupt. Is this the right approach to the problem or does someone have a sample VI that I can look at?
Thanks in advance,
Chris

Hi Chris,
I would not recommend using the BF UART VIs in an Interrupt VI -- VDK is very strict about what is allowed in ISRs, and in general, it is best to do as liitle as possible in ISRs. Also, the callback will execute when the buffer is full (not necessarily once a second).
Instead, you could do a simple timed loop application that has a period of 1s, and do the UART Read in the timed loop. Or, you could even do something as simple as put the BF UART Read in a while loop that contains a Wait Until Next ms Multiple function to cause the loop to execute once per second. I recommend using the UART echo example as a starting point (attached).
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Attachments:
UART echo.vi ‏39 KB

Outputs can not be modified from the Interrupt VI !!

Hi,
I was trying to use the timer1 interrupt to see how does it works. I activated the timer1 interrupt from interrupt manager screen and enabled the interrupt including the glibal interrupt enable. then i added a new VI to the project to use it as the interrupt service routine. i addeda global variable and i can modify the global variable from my interrupt VI. so far everything works good. but as soon as i add some simple code to modify the output bits of the MCB2300 (LED0 to LED7) it gives me some error. it builds the project, I can download it to the board but after running it stops the processor and gives some error. If I copy and past the same code from my interrupt VI to the main VI it works without any problem.
any idea why it reacts like this?
why I can not modify any outputs from my interrupt VI?
Besrt regards

You should be able to just check a box named "Use thread" on the interrupt manager page. Note that this option does add latency.
Here is the doc on the interrupt manager page:
http://zone.ni.com/reference/en-XX/help/372459C-01/lvembdialog/arm_int_mgr_page_db/

Interrupt on NI-PCIe-6259 comes irregular

Hi,
I'm writing a card driver for the NI-PCIe-6259 card using SUSE 10.0 with kernel 2.6.19 and xenomai-patch 2.3.0 and DDK.
I want to do data aquisition wit interrupts. The problem ist the interrupts come not equidistant.
I initialized the board as shown in the DDK examples. I set the sample rate to 50 Hz.
I additionally enabled the interrupt with the following instructions:
board->Interrupt_A_Enable.setAI_STOP_Interrupt_Enable (1);
board->Interrupt_A_Enable.flush ();
board->Interrupt_Control.setInterrupt_Group_A_Enable(1);
board->Interrupt_Control.setInterrupt_Group_B_Enable(0);
board->Interrupt_Control.flush ();
In the interrupt service routine are the following instructions:
board->AI_FIFO_Data.readRegister();
board->Interrupt_A_Ack.writeAI_STOP_Interrupt_Ack (1);
board->Interrupt_A_Ack.flush ();
board->Interrupt_Control.setInterrupt_Group_A_Enable(1);
board->Interrupt_Control.flush ();
This code works perfectly on the NI-PCI-6281 card. An interrupt comes every 20 ms.
With the NI-PCIe-6259 card the time between two interrupts is dithering mostly between 2 ms and 40 ms and sometimes (about every 30th interrupt) the time is greather than 500 ms. The sampling works with 50 Hz because if the time is high the FIFO ist half-full or full.
Does anyone know a reason for that? Are there any known problems with the NI-PCIe-6259 card?
Thanks
Christoph

Hi ConfusedInCanada,
It is possible for you if you can provide us screenshots of the code you are using? This will help us to find faster a workaround for your issue

MicroBlaze GPIO and timer interrupt

Hi
I want to use GPIO and timer interrupt. I use interrupt controller IP.
my target to get 1ms interrupt using timer and GPIO interrupt.
the problem is initialize timer interrupt second after initialize GPIO interrupt >>>> it works , but GPIO int doesn't work
then I put
XIntc_Enable(&Intc, 0);     // Enable GPIO interrupt high priority
timer interrupt GPIO interrupt work . but sitll there is a problem which is after GPIO interrupt the program hang and never return to main
this is the first post for me , I hope finding helpful replys
thanks
this is my code:
//************************************ for main **********************************************//
int main()
/*----------------------------------initializations--------------------------------------*/
        init_platform();
        print("Hello World\n\r");
        // initialize GPIO
                Gpio_initialization(&LED_GPIO,GPIO_DEVICE_ID);
        // initialize GPIO interrupt
                GpioIntr_initialization(&Intc,&LED_GPIO,GPIO_DEVICE_ID,
                                      XPAR_INTC_0_GPIO_0_VEC_ID, BUTTON_INTERRUPT);
                                       //INTC_DEVICE_ID
        // initialize Timer
        Status = TmrCtrIntr_start(&InterruptController,
                          &TimerCounterInst,
                          TMRCTR_DEVICE_ID,
                          TMRCTR_INTERRUPT_ID,
                          TIMER_CNTR_0);
while(1){
//************************************ for timer **********************************************//
int TmrCtrIntr_start(INTC* IntcInstancePtr,
           XTmrCtr* TmrCtrInstancePtr,
           u16 DeviceId,
           u16 IntrId,
           u8 TmrCtrNumber)
   int Status;
   * Initialize the timer counter so that it's ready to use,
   * specify the device ID that is generated in xparameters.h
   Status = XTmrCtr_Initialize(TmrCtrInstancePtr, DeviceId);
   if (Status != XST_SUCCESS) {
       return XST_FAILURE;
   print("Timer initialized \n\r");
   * Perform a self-test to ensure that the hardware was built
   * correctly, use the 1st timer in the device (0)
   Status = XTmrCtr_SelfTest(TmrCtrInstancePtr, TmrCtrNumber);
   if (Status != XST_SUCCESS) {
       return XST_FAILURE;
   * Connect the timer counter to the interrupt subsystem such that
   * interrupts can occur. This function is application specific.
   Status = TmrCtrSetupIntrSystem(IntcInstancePtr,
                   TmrCtrInstancePtr,
                   DeviceId,
                   IntrId,
                   TmrCtrNumber);
   if (Status != XST_SUCCESS) {
       return XST_FAILURE;
   * Setup the handler for the timer counter that will be called from the
   * interrupt context when the timer expires, specify a pointer to the
   * timer counter driver instance as the callback reference so the handler
   * is able to access the instance data
   XTmrCtr_SetHandler(TmrCtrInstancePtr, TimerCounterHandler,
                       TmrCtrInstancePtr);
   * Enable the interrupt of the timer counter so interrupts will occur
   * and use auto reload mode such that the timer counter will reload
   * itself automatically and continue repeatedly, without this option
   * it would expire once only
   XTmrCtr_SetOptions(TmrCtrInstancePtr, TmrCtrNumber,
               XTC_INT_MODE_OPTION | XTC_AUTO_RELOAD_OPTION);
   * Set a reset value for the timer counter such that it will expire
   * eariler than letting it roll over from 0, the reset value is loaded
   * into the timer counter when it is started
   XTmrCtr_SetResetValue(TmrCtrInstancePtr, TmrCtrNumber, RESET_VALUE);
   * Start the timer counter such that it's incrementing by default,
   * then wait for it to timeout a number of times
   XTmrCtr_Start(TmrCtrInstancePtr, TmrCtrNumber);
   return XST_SUCCESS;
//********************************************** for GPIO ************************************************************//
int GpioSetupIntrSystem(XIntc *IntcInstancePtr, XGpio *InstancePtr,
           u16 DeviceId, u32 IntrId, u32 IntrMask)
   int Result;
   GlobalIntrMask = IntrMask;
   * Initialize the interrupt controller driver so that it's ready to use.
   * specify the device ID that was generated in xparameters.h
   Result = XIntc_Initialize(IntcInstancePtr, INTC_DEVICE_ID);
   if (Result != XST_SUCCESS) {
       return Result;
   /* Hook up interrupt service routine */
   XIntc_Connect(IntcInstancePtr, IntrId,
              (Xil_ExceptionHandler)GpioHandler, InstancePtr);
   /* Enable the interrupt vector at the interrupt controller */
   XIntc_Enable(IntcInstancePtr, IntrId);
   * Start the interrupt controller such that interrupts are recognized
   * and handled by the processor
   Result = XIntc_Start(IntcInstancePtr, XIN_REAL_MODE);
   if (Result != XST_SUCCESS) {
       return Result;
   * Enable the GPIO channel interrupts so that push button can be
   * detected and enable interrupts for the GPIO device
   XGpio_InterruptEnable(InstancePtr, IntrMask);
   XGpio_InterruptGlobalEnable(InstancePtr);
   * Initialize the exception table and register the interrupt
   * controller handler with the exception table
   Xil_ExceptionInit();
   Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
           (Xil_ExceptionHandler)INTC_HANDLER, IntcInstancePtr);
   /* Enable non-critical exceptions */
   Xil_ExceptionEnable();
   return XST_SUCCESS;
}

Well Well
Thank you so much stephenm . yes it works now
The error is initialize INTC two times. It should be initialize once and use XIntc_Connect two times. one for GPIO and other for timer.
Thank you for your help.

Interrupt Service Routines in Labview

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