diff options
Diffstat (limited to 'firmware/target/arm/as3525/scrollwheel-as3525.c')
-rw-r--r-- | firmware/target/arm/as3525/scrollwheel-as3525.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/firmware/target/arm/as3525/scrollwheel-as3525.c b/firmware/target/arm/as3525/scrollwheel-as3525.c new file mode 100644 index 0000000000..a9e012a31f --- /dev/null +++ b/firmware/target/arm/as3525/scrollwheel-as3525.c | |||
@@ -0,0 +1,124 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2009-2010 by Thomas Martitz | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | |||
22 | #include "config.h" | ||
23 | #include "button.h" | ||
24 | #include "kernel.h" | ||
25 | #include "backlight.h" | ||
26 | |||
27 | void scrollwheel(unsigned int wheel_value) | ||
28 | { | ||
29 | #ifndef BOOTLOADER | ||
30 | /* current wheel values, parsed from dbop and the resulting button */ | ||
31 | unsigned btn = BUTTON_NONE; | ||
32 | /* old wheel values */ | ||
33 | static unsigned old_wheel_value = 0; | ||
34 | static unsigned old_btn = BUTTON_NONE; | ||
35 | |||
36 | /* | ||
37 | * Getting BUTTON_REPEAT works like this: Remember when the btn value was | ||
38 | * posted to the button_queue last, and if it was recent enough, generate | ||
39 | * BUTTON_REPEAT | ||
40 | */ | ||
41 | static long last_wheel_post = 0; | ||
42 | |||
43 | /* | ||
44 | * Providing wheel acceleration works as follows: We increment accel | ||
45 | * by 2 if the wheel was turned, and decrement it by 1 each tick | ||
46 | * (no matter if it was turned), that means: the longer and faster you turn, | ||
47 | * the higher accel will be. accel>>2 will actually posted to the button_queue | ||
48 | */ | ||
49 | static int accel = 0; | ||
50 | /* We only post every 4th action, as this matches better with the physical | ||
51 | * clicks of the wheel */ | ||
52 | static int counter = 0; | ||
53 | /* Read wheel | ||
54 | * Bits 13 and 14 of DBOP_DIN change as follows (Gray Code): | ||
55 | * Clockwise rotation 00 -> 01 -> 11 -> 10 -> 00 | ||
56 | * Counter-clockwise 00 -> 10 -> 11 -> 01 -> 00 | ||
57 | * | ||
58 | * For easy look-up, actual wheel values act as indicies also, | ||
59 | * which is why the table seems to be not ordered correctly | ||
60 | */ | ||
61 | static const unsigned char wheel_tbl[2][4] = | ||
62 | { | ||
63 | { 2, 0, 3, 1 }, /* Clockwise rotation */ | ||
64 | { 1, 3, 0, 2 }, /* Counter-clockwise */ | ||
65 | }; | ||
66 | |||
67 | if(button_hold()) | ||
68 | { | ||
69 | accel = counter = 0; | ||
70 | return; | ||
71 | } | ||
72 | |||
73 | if (old_wheel_value == wheel_tbl[0][wheel_value]) | ||
74 | btn = BUTTON_SCROLL_FWD; | ||
75 | else if (old_wheel_value == wheel_tbl[1][wheel_value]) | ||
76 | btn = BUTTON_SCROLL_BACK; | ||
77 | else if (old_wheel_value != wheel_value && accel > ACCEL_INCREMENT) | ||
78 | { /* if no button is read and wheel_value changed, assume old_btn */ | ||
79 | btn = old_btn; | ||
80 | } | ||
81 | /* else btn = BUTTON_NONE */ | ||
82 | |||
83 | if (btn != BUTTON_NONE) | ||
84 | { | ||
85 | if (btn != old_btn) | ||
86 | { | ||
87 | /* direction reversals nullify acceleration and counters */ | ||
88 | old_btn = btn; | ||
89 | accel = counter = 0; | ||
90 | } | ||
91 | /* wheel_delta will cause lists to jump over items, | ||
92 | * we want this for fast scrolling, but we must keep it accurate | ||
93 | * for slow scrolling */ | ||
94 | int wheel_delta = 0; | ||
95 | /* generate BUTTON_REPEAT if quick enough, scroll slightly faster too*/ | ||
96 | if (TIME_BEFORE(current_tick, last_wheel_post + WHEEL_REPEAT_INTERVAL)) | ||
97 | { | ||
98 | btn |= BUTTON_REPEAT; | ||
99 | wheel_delta = accel>>ACCEL_SHIFT; | ||
100 | } | ||
101 | |||
102 | accel += ACCEL_INCREMENT; | ||
103 | |||
104 | /* the wheel is more reliable if we don't send every change, | ||
105 | * every WHEEL_COUNTER_DIVth is basically one "physical click" | ||
106 | * which should make up 1 item in lists */ | ||
107 | if (++counter >= WHEEL_COUNTER_DIV && queue_empty(&button_queue)) | ||
108 | { | ||
109 | buttonlight_on(); | ||
110 | backlight_on(); | ||
111 | queue_post(&button_queue, btn, ((wheel_delta+1)<<24)); | ||
112 | /* message posted - reset count and remember post */ | ||
113 | counter = 0; | ||
114 | last_wheel_post = current_tick; | ||
115 | } | ||
116 | } | ||
117 | if (accel > 0) | ||
118 | accel--; | ||
119 | |||
120 | old_wheel_value = wheel_value; | ||
121 | #else | ||
122 | (void)wheel_value | ||
123 | #endif | ||
124 | } | ||