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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Rob Purchase
*
* 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 "cpu.h"
#include "button.h"
#include "adc.h"
#include "pcf50606.h"
#define TOUCH_MARGIN 8
static enum touchpad_mode current_mode = TOUCHPAD_POINT;
static short last_x, last_y;
static bool touch_available = false;
static int touchpad_buttons[3][3] =
{
{BUTTON_TOPLEFT, BUTTON_TOPMIDDLE, BUTTON_TOPRIGHT},
{BUTTON_MIDLEFT, BUTTON_CENTER, BUTTON_MIDRIGHT},
{BUTTON_BOTTOMLEFT, BUTTON_BOTTOMMIDDLE, BUTTON_BOTTOMRIGHT},
};
void touchpad_set_mode(enum touchpad_mode mode)
{
current_mode = mode;
}
enum touchpad_mode touchpad_get_mode(void)
{
return current_mode;
}
void button_set_touch_available(void)
{
touch_available = true;
}
struct touch_calibration_point {
short px_x; /* known pixel value */
short px_y;
short val_x; /* touchpad 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;
*data = 0;
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)
{
short x = 0, y = 0;
static long last_touch = 0;
bool send_touch = false;
int irq_level = disable_irq_save();
if (pcf50606_read(PCF5060X_ADCC1) & 0x80) /* Pen down */
{
unsigned char buf[3];
pcf50606_write(PCF5060X_ADCC2, (0xE<<1) | 1); /* ADC start X+Y */
pcf50606_read_multiple(PCF5060X_ADCS1, buf, 3);
pcf50606_write(PCF5060X_ADCC2, 0); /* ADC stop */
x = (buf[0] << 2) | (buf[1] & 3);
y = (buf[2] << 2) | ((buf[1] & 0xC) >> 2);
if (TIME_BEFORE(last_touch + HZ/5, current_tick))
{
if ((x > last_x + TOUCH_MARGIN) ||
(x < last_x - TOUCH_MARGIN) ||
(y > last_y + TOUCH_MARGIN) ||
(y < last_y - TOUCH_MARGIN))
{
send_touch = true;
}
}
else
{
send_touch = true;
}
}
restore_irq(irq_level);
if (send_touch)
{
last_x = x;
last_y = y;
*data = touch_to_pixels(x, y);
switch (current_mode)
{
case TOUCHPAD_POINT:
btn |= BUTTON_TOUCHPAD;
break;
case TOUCHPAD_BUTTON:
{
int px_x = (*data&0xffff0000)>>16;
int px_y = (*data&0x0000ffff);
btn |= touchpad_buttons[px_y/(LCD_HEIGHT/3)]
[px_x/(LCD_WIDTH/3)];
break;
}
}
}
last_touch = current_tick;
touch_available = false;
}
if (!(GPIOA & 0x4))
btn |= BUTTON_POWER;
return btn;
}
|
