Interrupt limitation on LPC552x

[JRIIS]

Hi - I Need to understand the limitation of Interrupts on LPC552x.

From DS it Documented:

Up to eight GPIOs can be selected as pin interrupts (PINT), triggered by rising,
falling or both input edges.

I need 14 GPIO for Interrupts!

Can I use the Pin interrupt input multiplexing if I have some interrupts that dont come at the same time?

Could I identify from witch pin an interrupts come from when using the Pin interrupt input multiplexing?

Thanks,

/Jakob

[Alexis_A]

Hello @JRIIS,

As you mention, the PINT only has 8 pins available but you can also use the GINT module to multiplex more inputs and trigger the interruption, unfortunately, in this peripheral is not possible to identify the pin using the registers but you could workaround this reading the state of the pin using the GPIO.PIN register.

In the PINT module is possible to identify which pin is the one that trigger the interrupt, if you look at the pint example in the SDK, the first parameter in the callback is to identify which pin is the one that trigger the interruption.

Let me know if this helps you.

Best Regards,

Alexis Andalon