topic Re: LPC55S69 : pin inversion and GINTx in LPC Microcontrollers

LPC55S69 : pin inversion and GINTx

EugeneHiihtaja — Thu, 21 Nov 2019 12:48:26 GMT

Hello !

Can pin be inverted first and after that contribute to GINTx group ?

For example Rising edge will be inverted to falling edge and after that is detected by GINTx ?

And wakeup capabilities from POWER DOWN mode is not degrade.

or pins connected to GINTx directly and no inversion is possible :

The pins can be configured as GPIO pins through IOCON, but they don’t have to be. The
GINT block reads the input from the pin bypassing IOCON multiplexing. Make sure that no
analog function is selected on pins that are input to the group interrupts. Selecting an
analog function in IOCON disables the digital pad and the digital signal is tied to 0.

Regards,

Eugene

Re: LPC55S69 : pin inversion and GINTx

Alexis_A — Mon, 25 Nov 2019 20:35:58 GMT

Hello Eugene,

Let me know if I understand correctly:

You want to invert the polarity after detecting one of the edges rising. If that is the case it shouldn't be a problem for the wake up from POWER DOWN.

Let me know if this helps you.

Best Regards,

Alexis Andalon

Re: LPC55S69 : pin inversion and GINTx

EugeneHiihtaja — Tue, 26 Nov 2019 07:07:06 GMT

Hi Alexis !

Here is the same problem as we discuss later on.

Only one pin can be inverted and included to GINT0 ( for example ) falling edge active and due inversion it detects rising edge.

All other pins can be included to GINT1 with falling edge detection.

But if inversed pin included with other pins it block everything.

It meas some problem exists and LPC is not working according spec.

Try on EVK inverse all 3 buttons and detect all edges.

What can be configuration ?

Please guide me how GINTx controllers works if it different from spec ?

Regards,

Eugene

Re: LPC55S69 : pin inversion and GINTx

Alexis_A — Tue, 26 Nov 2019 16:09:52 GMT

Hi Eugene,

Could you please ask all your question regarding this issue in the following thread?

https://community.nxp.com/thread/517911

Best Regards,

Alexis Andalon