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-rw-r--r--firmware/button.c151
-rw-r--r--firmware/button.h47
2 files changed, 198 insertions, 0 deletions
diff --git a/firmware/button.c b/firmware/button.c
new file mode 100644
index 0000000000..2bea49879c
--- /dev/null
+++ b/firmware/button.c
@@ -0,0 +1,151 @@
1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2002 by Daniel Stenberg
11 *
12 * All files in this archive are subject to the GNU General Public License.
13 * See the file COPYING in the source tree root for full license agreement.
14 *
15 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
16 * KIND, either express or implied.
17 *
18 ****************************************************************************/
19/*
20 * Archos Jukebox Recorder button functions
21 */
22
23#include "config.h"
24
25#ifdef HAVE_RECORDER_KEYPAD
26
27#include "types.h"
28#include "sh7034.h"
29#include "button.h"
30
31/* AJBR buttons are connected to the CPU as follows:
32 *
33 * ON and OFF are connected to separate port B input pins.
34 *
35 * F1, F2, F3, and UP are connected to the AN4 analog input, each through
36 * a separate voltage divider. The voltage on AN4 depends on which button
37 * (or none, or a combination) is pressed.
38 *
39 * DOWN, PLAY, LEFT, and RIGHT are likewise connected to AN5. */
40
41/* Button voltage levels on AN4 and AN5 */
42#define LEVEL1 50
43#define LEVEL2 125
44#define LEVEL3 175
45#define LEVEL4 225
46
47/* Number of calls to get_button for a button to stop bouncing
48 * and to be considered held down.
49 * Should really use a hardware timer for this.
50 */
51#define BOUNCE_COUNT 200
52#define HOLD_COUNT 10000
53
54static int last; /* Last button pressed */
55static int count; /* Number of calls button has been down */
56
57
58/*
59 *Initialize buttons
60 */
61void button_init()
62{
63#ifndef SIMULATOR
64 /* Set PB4 and PB8 as input pins */
65 PBCR1 &= 0xfffc; /* PB8MD = 00 */
66 PBCR2 &= 0xfcff; /* PB4MD = 00 */
67 PBIOR &= ~(PBDR_BTN_ON|PBDR_BTN_OFF); /* Inputs */
68
69 /* Set A/D to scan AN4 and AN5.
70 * This needs to be changed to scan other analog pins
71 * for battery level, etc. */
72 ADCSR = 0;
73 ADCR = 0;
74 ADCSR = ADCSR_ADST | ADCSR_SCAN | 0x5;
75#endif
76 last = BUTTON_NONE;
77 count = 0;
78}
79
80/*
81 * Get button pressed from hardware
82 */
83static int get_raw_button (void)
84{
85 /* Check port B pins for ON and OFF */
86 int data = PBDR;
87 if ((data & PBDR_BTN_ON) == 0)
88 return BUTTON_ON;
89 else if ((data & PBDR_BTN_OFF) == 0)
90 return BUTTON_OFF;
91
92 /* Check AN4 pin for F1-3 and UP */
93 data = ADDRAH;
94 if (data >= LEVEL4)
95 return BUTTON_F3;
96 else if (data >= LEVEL3)
97 return BUTTON_UP;
98 else if (data >= LEVEL2)
99 return BUTTON_F2;
100 else if (data >= LEVEL1)
101 return BUTTON_F1;
102
103 /* Check AN5 pin for DOWN, PLAY, LEFT, RIGHT */
104 data = ADDRBH;
105 if (data >= LEVEL4)
106 return BUTTON_DOWN;
107 else if (data >= LEVEL3)
108 return BUTTON_PLAY;
109 else if (data >= LEVEL2)
110 return BUTTON_LEFT;
111 else if (data >= LEVEL1)
112 return BUTTON_RIGHT;
113
114 return BUTTON_NONE;
115}
116
117/*
118 * Get the currently pressed button.
119 * Returns one of BUTTON_xxx codes, with possibly a modifier bit set.
120 * No modifier bits are set when the button is first pressed.
121 * BUTTON_HELD bit is while the button is being held.
122 * BUTTON_REL bit is set when button has been released.
123 */
124int button_get(void)
125{
126 int btn = get_raw_button();
127 int ret;
128
129 /* Last button pressed is still down */
130 if (btn != BUTTON_NONE && btn == last) {
131 count++;
132 if (count == BOUNCE_COUNT)
133 return btn;
134 else if (count >= HOLD_COUNT)
135 return btn | BUTTON_HELD;
136 else
137 return BUTTON_NONE;
138 }
139
140 /* Last button pressed now released */
141 if (btn == BUTTON_NONE && last != BUTTON_NONE)
142 ret = last | BUTTON_REL;
143 else
144 ret = BUTTON_NONE;
145
146 last = btn;
147 count = 0;
148 return ret;
149}
150
151#endif /* HAVE_RECORDER_KEYPAD */
diff --git a/firmware/button.h b/firmware/button.h
new file mode 100644
index 0000000000..93ac4b8eac
--- /dev/null
+++ b/firmware/button.h
@@ -0,0 +1,47 @@
1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2002 by Daniel Stenberg
11 *
12 * All files in this archive are subject to the GNU General Public License.
13 * See the file COPYING in the source tree root for full license agreement.
14 *
15 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
16 * KIND, either express or implied.
17 *
18 ****************************************************************************/
19
20#include "config.h"
21
22#ifdef HAVE_RECORDER_KEYPAD
23/*
24 * Archos Jukebox Recorder button functions
25 */
26
27/* Button codes */
28#define BUTTON_NONE 0x0000
29#define BUTTON_ON 0x0001
30#define BUTTON_OFF 0x0002
31#define BUTTON_PLAY 0x0004
32#define BUTTON_UP 0x0010
33#define BUTTON_DOWN 0x0020
34#define BUTTON_LEFT 0x0040
35#define BUTTON_RIGHT 0x0080
36#define BUTTON_F1 0x0100
37#define BUTTON_F2 0x0200
38#define BUTTON_F3 0x0400
39
40/* Button modifiers */
41#define BUTTON_HELD 0x4000
42#define BUTTON_REL 0x8000
43
44void button_init (void);
45int get_button (void);
46
47#endif
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