summaryrefslogtreecommitdiffstats
path: root/firmware/target/arm/tcc780x/cowond2/button-cowond2.c
blob: e66ba2332a6ef03f88f8c3f86ed518f7be7e1931 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2008 by Rob Purchase
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include "config.h"
#include "cpu.h"
#include "button.h"
#include "adc.h"
#include "pcf50606.h"
#include "backlight.h"
#include "touchscreen.h"
#include "stdlib.h"

#define NO_OF_TOUCH_DATA 5

static bool touch_available = false;
static short x[NO_OF_TOUCH_DATA], y[NO_OF_TOUCH_DATA];

/* comparator for qsort */
static int short_cmp(const void *a, const void *b)
{
    return *(short*)a - *(short*)b;
}

void button_read_touch()
{
    unsigned char buf[3];
    
    static long last_touch_interrupt = 0;
    static int touch_data_index = 0;

    /* put the touchscreen into idle mode */
    pcf50606_write(PCF5060X_ADCC1, 0);

    /* here the touch coordinates are read 5 times            */
    /* they will be sorted and the middle one will be used    */
    pcf50606_write(PCF5060X_ADCC2, (0xE<<1) | 1); /* ADC start X+Y */

    do {
        buf[1] = pcf50606_read(PCF5060X_ADCS2);
    } while (!(buf[1] & 0x80));        /* Busy wait on ADCRDY flag */

    buf[0] = pcf50606_read(PCF5060X_ADCS1);
    buf[2] = pcf50606_read(PCF5060X_ADCS3);

    pcf50606_write(PCF5060X_ADCC2, 0);            /* ADC stop */

    if (TIME_AFTER(current_tick, last_touch_interrupt + 1))
    {
        /* resets the index if the last touch could not be read 5 times */
        touch_data_index = 0;
    }

    x[touch_data_index] = (buf[0] << 2) | (buf[1] & 3);
    y[touch_data_index] = (buf[2] << 2) | ((buf[1] & 0xC) >> 2);

    touch_data_index++;

    if (touch_data_index > NO_OF_TOUCH_DATA - 1)
    {
        /* coordinates 5 times read */
        touch_available = true;
        touch_data_index = 0;
    }
    else
    {
        /* put the touchscreen back into the interrupt mode */
        pcf50606_write(PCF5060X_ADCC1, 1);
    }
    last_touch_interrupt = current_tick;
}

struct touch_calibration_point {
    short px_x; /* known pixel value */
    short px_y;
    short val_x; /* touchscreen value at the known pixel */
    short val_y;
};

static struct touch_calibration_point topleft, bottomright;

static int touch_to_pixels(short val_x, short val_y)
{
    short x,y;

    x=val_x;
    y=val_y;

    x = (x-topleft.val_x)*(bottomright.px_x - topleft.px_x)
            / (bottomright.val_x - topleft.val_x) + topleft.px_x;

    y = (y-topleft.val_y)*(bottomright.px_y - topleft.px_y)
            / (bottomright.val_y - topleft.val_y) + topleft.px_y;

    if (x < 0)
        x = 0;
    else if (x>=LCD_WIDTH)
        x=LCD_WIDTH-1;

    if (y < 0)
        y = 0;
    else if (y>=LCD_HEIGHT)
        y=LCD_HEIGHT-1;

    return (x<<16)|y;
}

void button_init_device(void)
{
    /* Configure GPIOA 4 (POWER) and 8 (HOLD) for input */
    GPIOA_DIR &= ~0x110;
    
    /* Configure GPIOB 4 (button pressed) for input */
    GPIOB_DIR &= ~0x10;

    touch_available = false;

    /* Arbitrary touchscreen calibration */
    topleft.px_x = 0;
    topleft.px_y = 0;
    topleft.val_x = 50;
    topleft.val_y = 50;

    bottomright.px_x = LCD_WIDTH;
    bottomright.px_y = LCD_HEIGHT;
    bottomright.val_x = 980;
    bottomright.val_y = 980;
}

bool button_hold(void)
{
    return (GPIOA & 0x8) ? false : true;
}

int button_read_device(int *data)
{
    int btn = BUTTON_NONE;
    int adc;
    static int old_data = 0;

    static bool hold_button = false;
    bool hold_button_old;
    static bool touch_hold = false;
    static long last_touch = 0;

    *data = old_data;

    hold_button_old = hold_button;
    hold_button = button_hold();

#ifndef BOOTLOADER
    if (hold_button != hold_button_old)
        backlight_hold_changed(hold_button);
#endif

    if (hold_button)
        return BUTTON_NONE;

    if (GPIOB & 0x4)
    {
        adc = adc_read(ADC_BUTTONS);

        /* The following contains some arbitrary, but working, guesswork */
        if (adc < 0x038) {
            btn |= (BUTTON_MINUS | BUTTON_PLUS | BUTTON_MENU);
        } else if (adc < 0x048) {
            btn |= (BUTTON_MINUS | BUTTON_PLUS);
        } else if (adc < 0x058) {
            btn |= (BUTTON_PLUS | BUTTON_MENU);
        } else if (adc < 0x070) {
            btn |= BUTTON_PLUS;
        } else if (adc < 0x090) {
            btn |= (BUTTON_MINUS  | BUTTON_MENU);
        } else if (adc < 0x150) {
            btn |= BUTTON_MINUS;
        } else if (adc < 0x200) {
            btn |= BUTTON_MENU;
        }
    }

    if (touch_available || touch_hold)
    {
        short x_touch, y_touch;
        static short last_x = 0, last_y = 0;

        if (touch_hold)
        {
            /* get rid of very fast unintended double touches */
            x_touch = last_x;
            y_touch = last_y;
        }
        else
        {
            /* sort the 5 data taken and use the median value */
            qsort(x, NO_OF_TOUCH_DATA, sizeof(short), short_cmp);
            qsort(y, NO_OF_TOUCH_DATA, sizeof(short), short_cmp);
            x_touch = last_x = x[(NO_OF_TOUCH_DATA - 1)/2];
            y_touch = last_y = y[(NO_OF_TOUCH_DATA - 1)/2];
            last_touch = current_tick;
            touch_hold = true;
            touch_available = false;
        }
        old_data = *data = touch_to_pixels(x_touch, y_touch);
        btn |= touchscreen_to_pixels((*data&0xffff0000)>>16,
                                     (*data&0x0000ffff),
                                     data);
    }

    if (TIME_AFTER(current_tick, last_touch + 10))
    {
        /* put the touchscreen back into interrupt mode */
        touch_hold = false;
        pcf50606_write(PCF5060X_ADCC1, 1);
    }
    
    if (!(GPIOA & 0x4))
        btn |= BUTTON_POWER;
        
    if (btn & BUTTON_TOUCHSCREEN && !is_backlight_on(true))
        old_data = *data = 0;
    
    return btn;
}