ra8_touch_point_t Struct Reference

One decoded touch contact. More...

#include <ra8_touch.h>

Data Fields
uint16_t	x
	Panel X coordinate.
uint16_t	y
	Panel Y coordinate.
uint8_t	track_id
	Persistent contact id (0..15).
uint8_t	pressure
	Approximate pressure / contact-area, 0..255.

Detailed Description

One decoded touch contact.

Coordinates are reported in panel-native units (the GT911 reports the X/Y resolution it was configured for; ra8_touch does not transform them). track_id is persistent across consecutive ra8_touch_read calls for the same physical contact, so callers can implement gesture recognisers without re-keying.

Invariant

track_id < 16 (GT911 stores it in 4 bits).

Definition at line 93 of file ra8_touch.h.

Field Documentation

pressure

uint8_t ra8_touch_point_t::pressure

Approximate pressure / contact-area, 0..255.

Definition at line 97 of file ra8_touch.h.

Referenced by internal_decode_one().

track_id

uint8_t ra8_touch_point_t::track_id

Persistent contact id (0..15).

Definition at line 96 of file ra8_touch.h.

Referenced by internal_decode_one().

x

uint16_t ra8_touch_point_t::x

Panel X coordinate.

Definition at line 94 of file ra8_touch.h.

Referenced by cm_poll_touch(), er_poll_touch(), ez_poll_touch(), internal_decode_one(), internal_td_poll_points(), and mg_poll_touch().

y

uint16_t ra8_touch_point_t::y

Panel Y coordinate.

Definition at line 95 of file ra8_touch.h.

Referenced by cm_poll_touch(), er_poll_touch(), ez_poll_touch(), internal_decode_one(), internal_td_poll_points(), ls_poll_touch(), and mg_poll_touch().

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The documentation for this struct was generated from the following file:

• libs/ra8_hal/inc/ra8_touch.h