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author | Marcin Bukat <marcin.bukat@gmail.com> | 2010-10-31 21:09:34 +0000 |
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committer | Marcin Bukat <marcin.bukat@gmail.com> | 2010-10-31 21:09:34 +0000 |
commit | 56c4e9fa600557242d8b78f5fd8e32c2245b76fc (patch) | |
tree | f8558778a302f89c3e819e66e86577a5e37c3660 /firmware/drivers/audio/dac3550a.c | |
parent | 40ed5f57d9be61f1200026e9b0f944a9718111c1 (diff) | |
download | rockbox-56c4e9fa600557242d8b78f5fd8e32c2245b76fc.tar.gz rockbox-56c4e9fa600557242d8b78f5fd8e32c2245b76fc.zip |
Separate mas35xx lowlevel stuff. Move SH specific bits to target tree. FS#11189 by me.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28425 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/drivers/audio/dac3550a.c')
-rw-r--r-- | firmware/drivers/audio/dac3550a.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/firmware/drivers/audio/dac3550a.c b/firmware/drivers/audio/dac3550a.c new file mode 100644 index 0000000000..e13602e481 --- /dev/null +++ b/firmware/drivers/audio/dac3550a.c | |||
@@ -0,0 +1,124 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id: dac.c 17847 2008-06-28 18:10:04Z bagder $ | ||
9 | * | ||
10 | * Copyright (C) 2002 by Linus Nielsen Feltzing | ||
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 | #include "config.h" | ||
22 | #include "stdbool.h" | ||
23 | #include "i2c.h" | ||
24 | #include "debug.h" | ||
25 | #include "dac3550a.h" | ||
26 | |||
27 | static bool line_in_enabled = false; | ||
28 | static bool dac_enabled = false; | ||
29 | |||
30 | /* convert tenth of dB volume (-780..+180) to dac3550 register value */ | ||
31 | int tenthdb2reg(int db) | ||
32 | { | ||
33 | if (db < -540) /* 3 dB steps */ | ||
34 | return (db + 780) / 30; | ||
35 | else /* 1.5 dB steps */ | ||
36 | return (db + 660) / 15; | ||
37 | } | ||
38 | |||
39 | int dac_volume(unsigned int left, unsigned int right, bool deemph) | ||
40 | { | ||
41 | int ret = 0; | ||
42 | unsigned char buf[3]; | ||
43 | |||
44 | i2c_begin(); | ||
45 | |||
46 | if (left > 0x38) | ||
47 | left = 0x38; | ||
48 | if (right > 0x38) | ||
49 | right = 0x38; | ||
50 | |||
51 | buf[0] = DAC_REG_WRITE | DAC_AVOL; | ||
52 | buf[1] = (left & 0x3f) | (deemph ? 0x40 : 0); | ||
53 | buf[2] = right & 0x3f; | ||
54 | |||
55 | /* send write command */ | ||
56 | if (i2c_write(DAC_DEV_WRITE,buf,3)) | ||
57 | { | ||
58 | ret = -1; | ||
59 | } | ||
60 | |||
61 | i2c_end(); | ||
62 | return ret; | ||
63 | } | ||
64 | |||
65 | /****************************************************************** | ||
66 | ** Bit6: 0 = 3V 1 = 5V | ||
67 | ** Bit5: 0 = normal 1 = low power | ||
68 | ** Bit4: 0 = AUX2 off 1 = AUX2 on | ||
69 | ** Bit3: 0 = AUX1 off 1 = AUX1 on | ||
70 | ** Bit2: 0 = DAC off 1 = DAC on | ||
71 | ** Bit1: 0 = stereo 1 = mono | ||
72 | ** Bit0: 0 = normal right amp 1 = inverted right amp | ||
73 | ******************************************************************/ | ||
74 | /* dac_config is called once to initialize it. we will apply | ||
75 | our static settings because of the init flow. | ||
76 | dac_init -> dac_line_in -> mpeg_init -> dac_config | ||
77 | */ | ||
78 | static int dac_config(void) | ||
79 | { | ||
80 | int ret = 0; | ||
81 | unsigned char buf[2]; | ||
82 | |||
83 | i2c_begin(); | ||
84 | |||
85 | buf[0] = DAC_REG_WRITE | DAC_GCFG; | ||
86 | buf[1] = (dac_enabled ? 0x04 : 0) | | ||
87 | (line_in_enabled ? 0x08 : 0); | ||
88 | |||
89 | /* send write command */ | ||
90 | if (i2c_write(DAC_DEV_WRITE,buf,2)) | ||
91 | { | ||
92 | ret = -1; | ||
93 | } | ||
94 | |||
95 | i2c_end(); | ||
96 | return ret; | ||
97 | } | ||
98 | |||
99 | void dac_enable(bool enable) | ||
100 | { | ||
101 | dac_enabled = enable; | ||
102 | dac_config(); | ||
103 | } | ||
104 | |||
105 | void dac_line_in(bool enable) | ||
106 | { | ||
107 | line_in_enabled = enable; | ||
108 | dac_config(); | ||
109 | } | ||
110 | |||
111 | void dac_init(void) | ||
112 | { | ||
113 | unsigned char buf[2]; | ||
114 | |||
115 | i2c_begin(); | ||
116 | |||
117 | buf[0] = DAC_REG_WRITE | DAC_SR_REG; | ||
118 | buf[1] = 0x07; | ||
119 | |||
120 | /* send write command */ | ||
121 | i2c_write(DAC_DEV_WRITE,buf,2); | ||
122 | i2c_end(); | ||
123 | } | ||
124 | |||