topic Re: LPC11C24 Interrupt Logic in LPC Microcontrollers

LPC11C24 Interrupt Logic

f_fiorini — Wed, 27 Feb 2019 18:26:45 GMT

Hi all,

I'm developing some software for a PCB using the LPC11C24 board as MCU, and I have a doubt regarding the interrupt logic.
As far as I know, I can define a WAKEUP_IRQHandler and a PIOINT0_IRQHandler, the former responsible of waking up the MCU when in (Deep) Sleep mode, the latter just defines a routine whenever any GPIO pin in Port 0 gets triggered accordingly.
I'm currently using pin 0_11 in both WAKEUP logic and to switch between states when the MCU is awake, but I'm unsure of what to expect.

Is it possible to dynamically change the interrupt trigger (from FALLING to RISING edge) and therefore use the same pin for two different interrupt handlers, based on its current interrupt logic?
If so, is there some example I can refer to? Or just have a chat with someone who managed to get this working.

Thank you in advance, any help is appreciated.

Best,

Federico

Re: LPC11C24 Interrupt Logic

kerryzhou — Fri, 01 Mar 2019 08:10:28 GMT

Hi Federico Fiorini,

About the falling or rising edge trigger, you still need to modify the control register to change the edge in your code.

The chip don't have the hardware function to realize it dynamically, you need associated with your code to realize it.

Actually, just change the STARTAPRP0 register configuration.

Wish it helps you!

If you still have question about it, please kindly let me know.

With is helps you!

Have a great day,
Kerry

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Re: LPC11C24 Interrupt Logic

f_fiorini — Fri, 01 Mar 2019 15:16:17 GMT

Thanks for the prompt reply kerryzhou‌!
My original idea was to dynamically change the register configuration from within the interrupt handlers, so that further triggers will be handled in either of the two (WAKEUP_IRQn and PIOINT0_IRQn).
Do you think this is going to be a proper solution?

Thank you in advance

Re: LPC11C24 Interrupt Logic

kerryzhou — Mon, 04 Mar 2019 06:49:10 GMT

Hi Federico Fiorini,

If your original interrupt is triggered, then enter the interrupt, I think you can modify the register in the interrupt handler.

You can try it on your side, whether it works or not.

If you still have question about it, please kindly let me know.
Have a great day,
Kerry

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