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Subject: The ultimate X5's joystick filter

The ultimate X5's joystick filter

From: Nicolas GIF <nicolas.gif_at_free.fr>
Date: Sat, 10 Mar 2007 14:49:39 +0100

Well, I tried my average trick, and it works amazingly well !! My down
button which was moving from 0xC8 to about 0xE0 hardly reach 0xD0 now.

I join my button-x5.c file.

/***************************************************************************
 * __________ __ ___.
 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
 * \/ \/ \/ \/ \/
 * $Id: button-x5.c 11967 2007-01-09 23:29:07Z linus $
 *
 * Copyright (C) 2006 by Linus Nielsen Feltzing
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "config.h"
#include "system.h"
#include "button.h"
#include "backlight.h"
#include "adc.h"
#include "lcd-remote-target.h"

/* have buttons scan by default */
static bool button_scan_on = true;
static bool hold_button = false;
static bool remote_hold_button = false;

void button_init_device(void)
{
    /* Power, Remote Play & Hold switch */
    GPIO_FUNCTION |= 0x0e000000;
    GPIO_ENABLE &= ~0x0e000000;
}

void button_enable_scan(bool enable)
{
    button_scan_on = enable;
}

bool button_scan_enabled(void)
{
    return button_scan_on;
}

bool button_hold(void)
{
    return (GPIO_READ & 0x08000000) == 0;
}

bool remote_button_hold(void)
{
    return remote_hold_button;
}

int button_read_device(void)
{
    int btn = BUTTON_NONE;
    bool hold_button_old;
    bool remote_hold_button_old;
    int data;
        
        #define FILTER 5
        const int tab_size = FILTER;
        static int tab[FILTER];
        const int tab_deltamax = 10;
        int tab_min = 0xFF;
        int tab_max = 0x00;
        int tab_delta;
        int tab_sum = 0;
        int tab_average;
        int i;
        

    /* normal buttons */
    hold_button_old = hold_button;
    hold_button = button_hold();

#ifndef BOOTLOADER
    /* give BL notice if HB state chaged */
    if (hold_button != hold_button_old)
        backlight_hold_changed(hold_button);
#endif

    
        
        if (button_scan_on && !hold_button)
    {
        data = adc_scan(ADC_BUTTONS);
        
                
                /* BUTTON FILTER by Nicolas GIF <nicolas.gif_at_free.fr*/
                //rotate array
                for (i = tab_size-1; i > 0; i--)
                {
                        tab[i] = tab[i-1];
                }
                tab[0] = data;
                
                //sum, min, max
                for (i = 0; i < tab_size; i++)
                {
                        tab_sum += tab[i];
                        if (tab[i] < tab_min)
                        {
                                tab_min = tab[i];
                        }
                        if (tab[i] > tab_max)
                        {
                                tab_max = tab[i];
                        }
                }
                
                //average
                tab_average = tab_sum / tab_size;
                
                //delta
                tab_delta = tab_max - tab_min;
                
                if (tab_delta < tab_deltamax)
                {
                        data = tab_average;
                }
                /*END FILTER*/
                
                
        if (data < 0xf0)
        {
            if(data < 0x7c)
                if(data < 0x42)
                    btn = BUTTON_LEFT;
                else
                    if(data < 0x62)
                        btn = BUTTON_RIGHT;
                    else
                        btn = BUTTON_SELECT;
            else
                if(data < 0xb6)
                    if(data < 0x98)
                        btn = BUTTON_REC;
                    else
                        btn = BUTTON_PLAY;
                else
                    if(data < 0xd3)
                        btn = BUTTON_DOWN;
                    else
                        btn = BUTTON_UP;
        }
    }

    /* remote buttons */
    data = remote_detect() ? adc_scan(ADC_REMOTE) : 0xff;

    remote_hold_button_old = remote_hold_button;
    remote_hold_button = data < 0x17;

#ifndef BOOTLOADER
    if (remote_hold_button != remote_hold_button_old)
        remote_backlight_hold_changed(remote_hold_button);
#endif

    if (!remote_hold_button)
    {
        if (data < 0xee)
        {
            if(data < 0x7a)
                if(data < 0x41)
                    btn |= BUTTON_RC_FF;
                else
                    if(data < 0x61)
                        btn |= BUTTON_RC_REW;
                    else
                        btn |= BUTTON_RC_MODE;
            else
                if(data < 0xb4)
                    if(data < 0x96)
                        btn |= BUTTON_RC_REC;
                    else
                        btn |= BUTTON_RC_MENU;
                else
                    if(data < 0xd1)
                        btn |= BUTTON_RC_VOL_UP;
                    else
                        btn |= BUTTON_RC_VOL_DOWN;
        }
    }

    data = GPIO_READ;

    /* hold and power are mutually exclusive */
    if (!(data & 0x04000000))
        btn |= BUTTON_POWER;

    /* remote play button should be dead if hold */
    if (!remote_hold_button && !(data & 0x02000000))
        btn |= BUTTON_RC_PLAY;

    return btn;
}
Received on 2007-03-10


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