Implement onDetect for Zephyr port.

[iabdalkader]

Additionally, fixes race conditions in event update/reading.

• loader: Add input callback data. arduino/ArduinoCore-zephyr#187

[pennam]

@iabdalkader testing this on my giga i'm getting weird values regarding the number of touch points. Even if I touch the display in one single point, the sketch reports 5 contacs. I've fixed this adding memset(_points, 0, sizeof(_points)); in the begin function.

[pennam]

I've fixed this adding memset(_points, 0, sizeof(_points)); in the begin function.

this is not true... I'm still having the issue.

[iabdalkader]

The instance should be in BSS so it should be zero'd. Is this polling or IRQ mode? In IRQ mode you get all points, with pressed set to 1 for touch. It's this way so we don't have to allocate a temporary stack buffer in the callback handler.

[pennam]

I was testing IRQ mode. Yes now i get it, the number of points is fixed here. Using the same sketch with mbed you get the real number of contacts not the maximum value.

[iabdalkader]

Using the same sketch with mbed you get the real number of contacts not the maximum value.

I know. We can make it work the same way, but since the mbed port is probably going to be deprecated anyway, I wonder if there's any point in keeping the API compatible. Note the API has other problems, for example no release detection, user could pass a smaller array to getTouchPoints, etc.. Anyway, let me know how you want to fix it.

[iabdalkader]

@pennam I fixed it using another copy of points in the class.