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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Jens Arnold
*
* 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"
/*
Recorder hardware button hookup
===============================
F1, F2, F3, UP: connected to AN4 through a resistor network
DOWN, PLAY, LEFT, RIGHT: likewise connected to AN5
The voltage on AN4/ AN5 depends on which keys (or key combo) is pressed
ON: PB8, low active
OFF: PB4, low active
*/
void button_init_device(void)
{
/* Set PB4 and PB8 as input pins */
PBCR1 &= 0xfffc; /* PB8MD = 00 */
PBCR2 &= 0xfcff; /* PB4MD = 00 */
PBIOR &= ~0x0110; /* Inputs */
}
int button_read_device(void)
{
int btn = BUTTON_NONE;
int data;
static int off_button_count = 0;
/* check F1..F3 and UP */
data = adc_read(ADC_BUTTON_ROW1);
if (data >= 250)
{
if (data >= 700)
if (data >= 900)
btn = BUTTON_F3;
else
btn = BUTTON_UP;
else
if (data >= 500)
btn = BUTTON_F2;
else
btn = BUTTON_F1;
}
/* Some units have mushy keypads, so pressing UP also activates
the Left/Right buttons. Let's combat that by skipping the AN5
checks when UP is pressed. */
if(!(btn & BUTTON_UP))
{
/* check DOWN, PLAY, LEFT, RIGHT */
data = adc_read(ADC_BUTTON_ROW2);
if (data >= 250)
{
if (data >= 700)
if (data >= 900)
btn |= BUTTON_DOWN;
else
btn |= BUTTON_PLAY;
else
if (data >= 500)
btn |= BUTTON_LEFT;
else
btn |= BUTTON_RIGHT;
}
}
/* check port B pins for ON and OFF */
data = PBDR;
if ((data & 0x0100) == 0)
btn |= BUTTON_ON;
if ((data & 0x0010) == 0)
{
/* When the batteries are low, the low-battery shutdown logic causes
* spurious OFF events due to voltage fluctuation on some units.
* Only accept OFF when read several times in sequence. */
if (++off_button_count > 3)
btn |= BUTTON_OFF;
}
else
off_button_count = 0;
return btn;
}
|
