C support for myRIO -TimerIRQ - problem

[jajarzombek]

Hello,
i've tried TimerIRQ example and i've encountered following problem: the comment in main.c says:

* Demonstrates how to use the timer IRQ. Once the timer IRQ occurs ( every 5 s), print
* the IRQ number,
However, th IRQ occurs only once, and i'd like it to happen repeatedly. Further comment in program says:

/*
* Configure the timer IRQ. The Time IRQ occurs only once after Timer_IrqConfigure().
* If you want to trigger the timer IRQ repeatedly, use this function every time you trigger the IRQ.
* Or you can put the IRQ in a loop.
* Return a status message to indicate if the configuration is successful. The error code is defined in IRQConfigure.h.
*/

Unfortunately, i can't find Timer_IrqConfigure() function or solve this problem in any other way. I'd really appreciate some help on this matter.

And second question: is there a way to make function time() from time.h to return value in miliseconds or microseconds? 

Greetings 

[asghar]

Hi

This post is about 2 years old and nobldy has commented. I came across this post a few days ago and tried to repeat the timer interrupt successfully, so thought I should explain for the benefit of others:

The timer used is a one shot timer. This means you set a time and it starts counting down and raises an interrupt when the count reaches zero. If you want another interrupt, you must rest the timer again - there is no auto_reload mechanism. This is explained in comments already quoted by you.

What I did was to call the function

status = Irq_RegisterTimerIrq(&irqTimer0, &irqThread0.irqContext, timeoutValue); ( in addition to calling it from the main as given in the example.)

inside the

Timer_Irq_Thread()

It raised interrupt twice. Then I used a loop around this function call and it repeats the timer interrupt for as long as 

irqThreadRdy is True.

Relevent code given here:

if (irqAssert & (1 << TIMERIRQNO))

{

printf("IRQ%d,%d\n", TIMERIRQNO, ++irqCount);

/*

* Acknowledge the IRQ(s) when assertion is done.

*/

Irq_Acknowledge(irqAssert);

}

/* This code added to repeat interrupt*/

// unregister the irq

status = Irq_UnregisterTimerIrq(&irqTimer0, irqThread0.irqContext);

if (status != NiMyrio_Status_Success)

{

printf("CONFIGURE ERROR: %d\n", status);

printf("Clear configuration of Timer IRQ failed.");

return status;

}

// Reregister the IRQ

status = Irq_RegisterTimerIrq(&irqTimer0, &irqThread0.irqContext, timeoutValue);