topic Re: LPC5536 PINT not working when set to edge triggered in LPC Microcontrollers

LPC5536 PINT not working when set to edge triggered

orange_chris — Mon, 21 Aug 2023 11:16:43 GMT

Hello,

I am trying to get an external interrupt working on a falling edge. My code is based on the driver example from MCUXPresso which works on the associated eval board. It looks like this:

INPUTMUX_AttachSignal(INPUTMUX, kPINT_PinInt0, kINPUTMUX_GpioPort0Pin26ToPintsel);
NVIC_SetPriority(PIN_INT0_IRQn , 1);
PINT_PinInterruptConfig(PINT, kPINT_PinInt0, kPINT_PinIntEnableFallEdge, callback_fn);
PINT_EnableCallbackByIndex(PINT, kPINT_PinInt0);

On the pin, there is ususally 3V3 level and when an external event happens, the pin is pulled to low for 200us.

I get no reaction, the callback is never called. Interestingly, if I change the interrupt config to low level, the callback gets called so the basic configuration can't be that bad. I suspect some strange filtering or something like that is going on. Can anybody help me?

Regards,
Christian

Re: LPC5536 PINT not working when set to edge triggered

Alice_Yang — Tue, 22 Aug 2023 06:47:46 GMT

Hello @orange_chris

Do you have LPCxpressso55s36-evk board? If yes, how about test your project ton EVK board?

If still have same issue, please send your project to me, I help you check.

Alice

Re: LPC5536 PINT not working when set to edge triggered

orange_chris — Thu, 24 Aug 2023 06:31:29 GMT

Hello, I've got it running in the meantime. It was a init order problem. The IOCON was not clocked yet.