How can I detect the state of an LPCOMP input?

RE: How can I detect the state of an LPCOMP input?

Sigurd — Wed, 24 May 2017 07:51:38 GMT

Hi gannerud,

Yes, that is correct. For each CROSS event there will also either be a UP or DOWN event also. But you can individually configure on which of these events an interrupt should be triggered. Using the LPCOMP driver in the SDK you can either configure for a DOWN, UP or CROSS event.

RE: How can I detect the state of an LPCOMP input?

gannerud — Wed, 24 May 2017 06:51:24 GMT

Not according to the nrf52 Product Specification:

The LPCOMP will generate events every time VIN+ crosses VIN-. More specifically, every time VIN+ rises above VIN- (upward crossing) an UP event is generated along with a CROSS event. Every time VIN+ falls below VIN- (downward crossing), a DOWN event is generated along with a CROSS event.

But in reality it seems to be the way Sigurd said, you only get an CROSS event. Can someone from Nordic clarify this?

RE: How can I detect the state of an LPCOMP input?

Sigurd — Tue, 25 Apr 2017 07:35:12 GMT

Hi,

If you have configured for CROSS event, you will get an event called NRF_LPCOMP_EVENT_CROSS. So you need to look for that event in your LPCOMP event handler.

if (event == NRF_LPCOMP_EVENT_CROSS) { ...do something }