Gesture.c File Reference

Gesture for touch screen. More...

#include "Platform.h"
#include "EVE_CoCmd.h"
#include "Common.h"
#include "Gesture.h"

Go to the source code of this file.

Functions
static int	Getvelocity_X ()
	Get horizontal veloxity.
static uint32_t	GetTagReleased ()
	Get the Tag number of Released object.
uint8_t	Gesture_GetTag (EVE_HalContext *phost)
	Get Active tag number.
Gesture_Touch_t *	Gesture_Renew (Gpu_Hal_Context_t *phost)
	Refresh gesture data.
Gesture_Touch_t *	Gesture_Get ()
	Get gesture data.

Variables
static Gesture_Touch_t	sGesture
static uint32_t	sTag
static uint16_t	sIsTouch
static uint16_t	sTouchX
static uint16_t	sTouchY
static uint8_t	sIsSwipe = 0
static const int	sMinMove = 15

Detailed Description

Gesture for touch screen.

Author

Tuan Nguyen tuan..nosp@m.nguy.nosp@m.en@br.nosp@m.tchi.nosp@m.p.com

Date

2019

MIT License

Copyright (c) [2019] [Bridgetek Pte Ltd (BRTChip)]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Definition in file Gesture.c.

Function Documentation

Gesture_Get()

Gesture_Touch_t * Gesture_Get

(

)

Get gesture data.

Returns

Gesture_Touch_t*

Definition at line 198 of file Gesture.c.

{
    return &sGesture;
}

Gesture_GetTag()

uint8_t Gesture_GetTag

(

EVE_HalContext *

phost

)

Get Active tag number.

Parameters

phost

Pointer to Hal context

Returns

uint8_t Tag number

Definition at line 140 of file Gesture.c.

{
    static uint8_t Read_tag = 0;
    static uint8_t temp_tag = 0;
    static uint8_t ret_tag = 0;
    static uint8_t sk = 0;
 
    Read_tag = EVE_Hal_rd8(phost, REG_TOUCH_TAG);
    ret_tag = 0;
    if (Read_tag != 0)                // Allow if the Key is released
    {
        if (temp_tag != Read_tag)
        {
            temp_tag = Read_tag;
            sk = Read_tag;         // Load the Read tag to temp variable
        }
    }
    else
    {
        if (temp_tag != 0)
        {
            ret_tag = temp_tag;
            temp_tag = 0; //The event will be processed. Clear the tag
        }
        sk = 0;
    }
    return ret_tag;
}

Gesture_Renew()

Gesture_Touch_t * Gesture_Renew

(

Gpu_Hal_Context_t *

phost

)

Refresh gesture data.

Definition at line 173 of file Gesture.c.

{
    sTag = Gpu_Hal_Rd32(phost, REG_TOUCH_TAG) & 0xFF;
    sIsTouch = Gpu_Hal_Rd32(phost, REG_TOUCH_RAW_XY) != 0xFFFFFFFF;
    sTouchX = Gpu_Hal_Rd16(phost, REG_TOUCH_SCREEN_XY + 2);
    sTouchY = Gpu_Hal_Rd16(phost, REG_TOUCH_SCREEN_XY + 4);
    uint32_t track = Gpu_Hal_Rd32(phost, REG_TRACKER);
    sGesture.tagTrackTouched = track & 0xFF;
    sGesture.trackValLine = track >> 16;
    sGesture.trackValCircle = (track >> 16) * 360 / 65535;
    sGesture.isTouch = (uint8_t)sIsTouch;
    sGesture.tagPressed = sTag;
    sGesture.isSwipe = sIsSwipe;
    sGesture.tagReleased = GetTagReleased();
    sGesture.velocityX = Getvelocity_X();
    sGesture.touchX = sTouchX;
    sGesture.touchY = sTouchY;
    return &sGesture;
}

GetTagReleased()

static uint32_t GetTagReleased ( )

static

Get the Tag number of Released object.

Returns

uint8_t Tag number

Definition at line 117 of file Gesture.c.

                                 {
    static uint32_t oldtag = 0;
    uint32_t newTag = 0;
    uint32_t tagRet = 0;
 
    newTag = sTag;
 
    if (newTag == 0 && oldtag != newTag) {
        tagRet = oldtag;
        oldtag = 0;
    }
    else if (newTag != 0) {
        oldtag = newTag;
    }
    return tagRet;
}

Getvelocity_X()

static int Getvelocity_X ( )

static

Get horizontal veloxity.

Returns

int horizontal veloxity value

Definition at line 51 of file Gesture.c.

                           {
    static uint16_t _delay = 0;
    static int lastTouchX = 0;
    static uint32_t prev_time = 0;
    uint32_t time = EVE_millis();
    static int distance = 0;
    static long dragprev = 0;
    static int velocityX = 0;
    static int count1Touch = 0;
 
    if (prev_time != 0) {
        _delay += (time - prev_time);
    }
    prev_time = time;
 
    if (_delay < 30) {
        return velocityX;
    }
    _delay = 0;
 
    if (sIsTouch) {
        if (sIsSwipe == 0) {
            if (lastTouchX == 0) {
                lastTouchX = sTouchX;
            }
            else {
                distance = sTouchX - lastTouchX;
            }
            if (abs(distance) > sMinMove) { // this is a swipe
                sIsSwipe = 1;
            }
        }
    }
    else {
        distance = 0;
        lastTouchX = 0;
        sIsSwipe = 0;
    }
 
    if (sIsSwipe == 1) {
        velocityX = (dragprev - sTouchX) << 4;
    }
    else if (!sIsTouch) { // no touch
        int change = MAX(1, abs(velocityX) >> 5);
        if (velocityX < 0)
            velocityX += change;
        if (velocityX > 0)
            velocityX -= change;
    }
    else {
        count1Touch++;
        if (count1Touch == 5) {
            count1Touch = 0;
            velocityX = 0; // reset velocity when single touch
        }
    }
 
    dragprev = sTouchX;
    return velocityX;
}

Variable Documentation

sGesture

Gesture_Touch_t sGesture

static

Definition at line 38 of file Gesture.c.

sIsSwipe

uint8_t sIsSwipe = 0

static

Definition at line 43 of file Gesture.c.

sIsTouch

uint16_t sIsTouch

static

Definition at line 40 of file Gesture.c.

sMinMove

const int sMinMove = 15

static

Definition at line 44 of file Gesture.c.

sTag

uint32_t sTag

static

Definition at line 39 of file Gesture.c.

sTouchX

uint16_t sTouchX

static

Definition at line 41 of file Gesture.c.

sTouchY

uint16_t sTouchY

static

Definition at line 42 of file Gesture.c.