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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Thomas Martitz
* Copyright (C) 2008 by Dominik Wenger
*
* 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.
*
****************************************************************************/
/* Basic button driver for the Fuze
*
* TODO: - Get the wheel working with interrupts
* - find that Home button
*/
#include "system.h"
#include "button.h"
#include "button-target.h"
#include "backlight.h"
#define WHEEL_REPEAT_INTERVAL 30
#define WHEELCLICKS_PER_ROTATION 48 /* wheelclicks per full rotation */
/* Buttons */
static bool hold_button = false;
#ifndef BOOTLOADER
static bool hold_button_old = false;
#endif
static short _dbop_din = BUTTON_NONE;
/* in the lcd driver */
extern bool lcd_button_support(void);
void button_init_device(void)
{
GPIOA_DIR |= (1<<1);
GPIOA_PIN(1) = (1<<1);
}
#if !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL)
static void scrollwheel(void)
{
static unsigned old_wheel_value = 0;
static unsigned wheel_value = 0;
static unsigned wheel_repeat = BUTTON_NONE;
unsigned btn = BUTTON_NONE;
/* getting BUTTON_REPEAT works like this: We increment repeat by 2 if the
* wheel was turned, and decrement it by 1 each tick,
* that means: if you change the wheel fast enough, repeat will be >1 and
* we send BUTTON_REPEAT
*/
static int repeat = 0;
/* we omit 3 of 4 posts to the button_queue, that works better, so count */
static int counter = 0;
/* Read wheel
* Bits 13 and 14 of DBOP_DIN change as follows:
* Clockwise rotation 00 -> 01 -> 11 -> 10 -> 00
* Counter-clockwise 00 -> 10 -> 11 -> 01 -> 00
*/
static const unsigned char wheel_tbl[2][4] =
{
{ 2, 0, 3, 1 }, /* Clockwise rotation */
{ 1, 3, 0, 2 }, /* Counter-clockwise */
};
wheel_value = _dbop_din & (1<<13|1<<14);
wheel_value >>= 13;
if (old_wheel_value == wheel_tbl[0][wheel_value])
btn = BUTTON_SCROLL_FWD;
else if (old_wheel_value == wheel_tbl[1][wheel_value])
btn = BUTTON_SCROLL_BACK;
if (btn != BUTTON_NONE)
{
if (btn != wheel_repeat)
{
/* direction reversals nullify repeats */
wheel_repeat = btn;
repeat = 0;
}
if (btn != BUTTON_NONE)
{
/* generate repeats if quick enough */
if (repeat > 0)
{
btn |= BUTTON_REPEAT;
}
repeat += 2;
/* the wheel is more reliable if we don't send ever change,
* every 4th is basically one "physical click" is 1 item in
* the rockbox menus */
if (queue_empty(&button_queue) && ++counter >= 4)
{
buttonlight_on();
backlight_on();
queue_post(&button_queue, btn, 1<<24);
/* message posted - reset count */
counter = 0;
}
}
}
if (repeat > 0)
repeat--;
else
repeat = 0;
old_wheel_value = wheel_value;
}
#endif /* !defined(BOOTLOADER) && defined(SCROLLWHEEL) */
bool button_hold(void)
{
return hold_button;
}
static short button_dbop(void)
{
/* skip home reading if lcd_button_support was blocked,
* since the dbop bit 15 is invalid then, and use the old value instead */
/* -20 (arbitary value) indicates valid home button read */
int old_home = -20;
int delay = 0;
if(!lcd_button_support())
old_home = (_dbop_din & 1<<15);
/* Wait for fifo to empty */
while ((DBOP_STAT & (1<<10)) == 0);
DBOP_CTRL |= (1<<19);
DBOP_CTRL &= ~(1<<16); /* disable output */
DBOP_TIMPOL_01 = 0xe167e167;
DBOP_TIMPOL_23 = 0xe167006e;
while(delay++ < 64);
DBOP_CTRL |= (1<<15); /* start read */
((DBOP_STAT & (1<<16)) == 0); /* wait for valid data */
_dbop_din = DBOP_DIN; /* now read */
DBOP_TIMPOL_01 = 0x6e167;
DBOP_TIMPOL_23 = 0xa167e06f;
DBOP_CTRL |= (1<<16);
DBOP_CTRL &= ~(1<<19);
if (old_home != -20)
_dbop_din |= old_home;
return _dbop_din;
}
/* for the debug menu */
short button_dbop_data(void)
{
return _dbop_din;
}
static int button_gpio(void)
{
int btn = BUTTON_NONE;
if(hold_button)
return btn;
/* set afsel, so that we can read our buttons */
GPIOC_AFSEL &= ~(1<<2|1<<3|1<<4|1<<5|1<<6);
/* set dir so we can read our buttons (but reset the C pins first) */
GPIOB_DIR &= ~(1<<4);
GPIOC_DIR |= (1<<2|1<<3|1<<4|1<<5|1<<6);
GPIOC_PIN(2) = (1<<2);
GPIOC_PIN(3) = (1<<3);
GPIOC_PIN(4) = (1<<4);
GPIOC_PIN(5) = (1<<5);
GPIOC_PIN(6) = (1<<6);
GPIOC_DIR &= ~(1<<2|1<<3|1<<4|1<<5|1<<6);
/* small delay needed to read buttons correctly */
int delay = 0;
while(delay++ < 32);
/* direct GPIO connections */
if (!GPIOC_PIN(3))
btn |= BUTTON_LEFT;
if (!GPIOC_PIN(2))
btn |= BUTTON_UP;
if (!GPIOC_PIN(6))
btn |= BUTTON_DOWN;
if (!GPIOC_PIN(5))
btn |= BUTTON_RIGHT;
if (!GPIOC_PIN(4))
btn |= BUTTON_SELECT;
/* return to settings needed for lcd */
GPIOC_DIR |= (1<<2|1<<3|1<<4|1<<5|1<<6);
GPIOC_AFSEL |= (1<<2|1<<3|1<<4|1<<5|1<<6);
return btn;
}
/*
* Get button pressed from hardware
*/
int button_read_device(void)
{
int btn = BUTTON_NONE;
short dbop = button_dbop();
static unsigned power_counter = HZ;
/* hold button */
if(dbop & (1<<12))
{
power_counter = 0;
hold_button = true;
}
else
{
/* might wrap, but shouldn't be much of an issue*/
power_counter++;
hold_button = false;
#if defined(HAVE_SCROLLWHEEL) && !defined(BOOTLOADER)
/* read wheel on bit 13 & 14, but sent to the button queue seperately */
scrollwheel();
#endif
/* read power on bit 8, but not if hold button was just released, since
* you basically always hit power due to the slider mechanism after releasing
* hold (wait ~1 sec) */
if (dbop & (1<<8) && power_counter>HZ)
btn |= BUTTON_POWER;
/* read home on bit 15 */
if (!(dbop & (1<<15)))
btn |= BUTTON_HOME;
btn |= button_gpio();
}
#ifndef BOOTLOADER
/* light handling */
if (hold_button != hold_button_old)
{
hold_button_old = hold_button;
backlight_hold_changed(hold_button);
}
#endif /* BOOTLOADER */
return btn;
}
|