delay for ISR to activated

[faysal_002299]

Hello all,
I am a newbie and I have a very simple thing to know. Please help me.


I am using an external interrupt routine for doing a certain task. For example when the interrupt is activated, the MCU sends some information to the host PC- it's quite simple. Now I want to modify this in a way so that, the MCU will send that information to the PC after 1 second of getting the interrupt signal. How can I implement that in the ISR? Any code example would be really helpful for me.



with Thanks

 

[Pommie]

In your ISR, when the external interrupt happens start a timer and when the timer interrupt happens send the data.

You don't state which MCU or language and so example code is rather difficult to provide.

<edit>I posted example code in this thread showing how to do both an external and timer interrupt at the same time.</edit>

Mike.

 

[faysal_002299]

Sorry...I forgot

I am using dsPIC30F3011

According to you it will be somewhat like this I this-
T1CONbits.TON = 1;

But the problem is I don't want to use timer as I have to use the timer for other purposes. Please suggest me an alternative

Thanks a lot for your quick responce

 

[Pommie]

Don't the DSpics have 3 16bit timers? You should be able to use one to provide a tick clock of say 10mS and use that to do the ISR delay as well as any other delays you may require. Look at the example I posted earlier and see if it makes sense.

Mike.

 

[faysal_002299]

Dear Mike thanks again.

Ya dsPIC has 3 timers. But I have to do this thing in six external interrupts. Furthermore, I am using 2 out of these 3 timers in the Input capture ISR for calculating pulsewidth of pwm. So I have no way to use timers for this operation.

 

[Pommie]

Why can't you use the spare timer to generate a 10mS interrupt and have counters for the 6 inputs? If you can't do that then you need to explain in more detail what you are trying to do.

Mike.