Touch and Hold to register a touch

[LiveRock]

Hi

Do you have a sample to implement a 'Touch and Hold' to register a touch?

The docs say check out:

The press and hold is controlled via a register:
https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/00001571B.pdf

Any tips?

[ChrisBall]

Afraid not! This library was only put together to test whether the CAP1298 was suitable for something I was working on - it wasn't. I didn't take it any further than I needed to, so most functionality is not implemented.

That said, you should be able to enable repeats with register CAP1298_RPTRATEENABLE (0x28), then fine tune the hold/repeat times in registers CAP1298_SENSINPUTCONFIG1 (0x22) and CAP1298_CONFIG2 (0x44). This is briefly described in section 4.9.2 of the datasheet.

I'd be happy to put together an example and modify the library to support touch and hold configuration - but it may have to wait a while!

[LiveRock]

Thank you for your fast response.
In the specs, there is mention of a ALERT pin.
So, for 'Touch and Hold', do we need to use Interrupt?

Very much appreciate if you update the library and samples. Many thanks!!

[ChrisBall]

Yep, I'd believe you need to use interrupt.

[LiveRock]

Hi Chris

Here is what I am doing but I am not getting the ALERT interrupt:
Here are the config:
Register 0x2A value: 0x00 // CAP1298_MTCONFIG
Register 0x1F value: 0x5F // CAP1298_SENSITIVITY
Register 0x28 value: 0xFE // CAP1298_RPTRATEENABLE
Register 0x26 value: 0xFF // CAP1298_CALIBRATE
Register 0x23 value: 0x0F // CAP1298_SENSINPUTCONFIG2
Register 0x27 value: 0xFF // CAP1298_INTENABLE

Q1: Why am I not getting any interrupt?

Q2: If I receive the interrupt, do I check the status at 0x03 (CAP1298_SENSTATUS) ?

[ChrisBall]

Hi LiveRock,

Unfortunately my CAP1298 is no longer responding, so I won't be able to further troubleshoot or adapt the existing code.

With regards to your questions:
Q1: I couldn't say without seeing your setup and code.
Q2: I haven't implemented any touch and hold/interrupt features, and cannot test, so I can only guess from reading the datasheet. Is the INT bit in 0x00 changing state at all?

Chris

[LiveRock]

Thank you Chris. Let me spend a bit of time to figure it out.