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author | Barry Wardell <rockbox@barrywardell.net> | 2007-11-11 16:00:33 +0000 |
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committer | Barry Wardell <rockbox@barrywardell.net> | 2007-11-11 16:00:33 +0000 |
commit | c495cdae5926c9245d7c943c72a97206d4a0e22a (patch) | |
tree | 86afcd473d1c151ffd26fcb8e941be44a0bbbf53 /firmware/target/arm/iriver/h10/fmradio_i2c-h10.c | |
parent | 496027d8bb89ba6d503b544f5652f4d1683d43af (diff) | |
download | rockbox-c495cdae5926c9245d7c943c72a97206d4a0e22a.tar.gz rockbox-c495cdae5926c9245d7c943c72a97206d4a0e22a.zip |
FS#8046: H10 FM tuner support. Thanks to Przemyslaw Holubowski for doing the hard work in figuring out how to communicate with the tuner.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15578 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm/iriver/h10/fmradio_i2c-h10.c')
-rw-r--r-- | firmware/target/arm/iriver/h10/fmradio_i2c-h10.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/firmware/target/arm/iriver/h10/fmradio_i2c-h10.c b/firmware/target/arm/iriver/h10/fmradio_i2c-h10.c new file mode 100644 index 0000000000..f3d3075df9 --- /dev/null +++ b/firmware/target/arm/iriver/h10/fmradio_i2c-h10.c | |||
@@ -0,0 +1,206 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * Physical interface of the Philips TEA5767 in iriver H10 series | ||
10 | * | ||
11 | * Copyright (C) 2002 by Linus Nielsen Feltzing | ||
12 | * | ||
13 | * All files in this archive are subject to the GNU General Public License. | ||
14 | * See the file COPYING in the source tree root for full license agreement. | ||
15 | * | ||
16 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
17 | * KIND, either express or implied. | ||
18 | * | ||
19 | ****************************************************************************/ | ||
20 | #include "config.h" | ||
21 | #include "cpu.h" | ||
22 | #include "logf.h" | ||
23 | #include "system.h" | ||
24 | |||
25 | /* cute little functions, atomic read-modify-write */ | ||
26 | |||
27 | #define SDA_OUTINIT GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_VAL, 0x08) | ||
28 | #define SDA_HI_IN GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_EN, 0x08) | ||
29 | #define SDA_LO_OUT GPIO_SET_BITWISE(GPIOD_OUTPUT_EN, 0x08) | ||
30 | #define SDA (GPIOD_INPUT_VAL & 0x08) | ||
31 | |||
32 | #define SCL_INPUT GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_EN, 0x10) | ||
33 | #define SCL_OUTPUT GPIO_SET_BITWISE(GPIOD_OUTPUT_EN, 0x10) | ||
34 | #define SCL_LO GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_VAL, 0x10) | ||
35 | #define SCL_HI GPIO_SET_BITWISE(GPIOD_OUTPUT_VAL,0x10) | ||
36 | #define SCL (GPIOD_INPUT_VAL & 0x10) | ||
37 | |||
38 | #define DELAY udelay(2) | ||
39 | |||
40 | static void fmradio_i2c_start(void) | ||
41 | { | ||
42 | SCL_HI; | ||
43 | SCL_OUTPUT; | ||
44 | SDA_HI_IN; | ||
45 | SDA_OUTINIT; | ||
46 | DELAY; | ||
47 | SDA_LO_OUT; | ||
48 | DELAY; | ||
49 | SCL_LO; | ||
50 | } | ||
51 | |||
52 | static void fmradio_i2c_stop(void) | ||
53 | { | ||
54 | SDA_LO_OUT; | ||
55 | DELAY; | ||
56 | SCL_HI; | ||
57 | DELAY; | ||
58 | SDA_HI_IN; | ||
59 | } | ||
60 | |||
61 | /* Generate ACK or NACK */ | ||
62 | static void fmradio_i2c_ack(bool nack) | ||
63 | { | ||
64 | /* Here's the deal. The slave is slow, and sometimes needs to wait | ||
65 | before it can receive the acknowledge. Therefore it forces the clock | ||
66 | low until it is ready. We need to poll the clock line until it goes | ||
67 | high before we release the ack. | ||
68 | |||
69 | In their infinite wisdom, iriver didn't pull up the SCL line, so | ||
70 | we have to drive the SCL high repeatedly to simulate a pullup. */ | ||
71 | |||
72 | if (nack) | ||
73 | SDA_HI_IN; | ||
74 | else | ||
75 | SDA_LO_OUT; | ||
76 | DELAY; | ||
77 | |||
78 | SCL_HI; | ||
79 | do | ||
80 | { | ||
81 | SCL_OUTPUT; /* Set the clock to output */ | ||
82 | SCL_INPUT; /* Set the clock to input */ | ||
83 | DELAY; | ||
84 | } | ||
85 | while(!SCL); /* and wait for the slave to release it */ | ||
86 | |||
87 | SCL_OUTPUT; | ||
88 | SCL_LO; | ||
89 | } | ||
90 | |||
91 | static int fmradio_i2c_getack(void) | ||
92 | { | ||
93 | int ret = 1; | ||
94 | |||
95 | /* Here's the deal. The slave is slow, and sometimes needs to wait | ||
96 | before it can send the acknowledge. Therefore it forces the clock | ||
97 | low until it is ready. We need to poll the clock line until it goes | ||
98 | high before we read the ack. | ||
99 | |||
100 | In their infinite wisdom, iriver didn't pull up the SCL line, so | ||
101 | we have to drive the SCL high repeatedly to simulate a pullup. */ | ||
102 | |||
103 | SDA_HI_IN; | ||
104 | DELAY; | ||
105 | |||
106 | SCL_HI; /* set clock to high */ | ||
107 | do | ||
108 | { | ||
109 | SCL_OUTPUT; /* Set the clock to output */ | ||
110 | SCL_INPUT; /* Set the clock to input */ | ||
111 | DELAY; | ||
112 | } | ||
113 | while(!SCL); /* and wait for the slave to release it */ | ||
114 | |||
115 | if (SDA) | ||
116 | ret = 0; /* ack failed */ | ||
117 | |||
118 | SCL_OUTPUT; | ||
119 | SCL_LO; | ||
120 | |||
121 | return ret; | ||
122 | } | ||
123 | |||
124 | static void fmradio_i2c_outb(unsigned char byte) | ||
125 | { | ||
126 | int i; | ||
127 | |||
128 | /* clock out each bit, MSB first */ | ||
129 | for ( i=0x80; i; i>>=1 ) { | ||
130 | if ( i & byte ) | ||
131 | SDA_HI_IN; | ||
132 | else | ||
133 | SDA_LO_OUT; | ||
134 | DELAY; | ||
135 | SCL_HI; | ||
136 | DELAY; | ||
137 | SCL_LO; | ||
138 | } | ||
139 | } | ||
140 | |||
141 | static unsigned char fmradio_i2c_inb(void) | ||
142 | { | ||
143 | int i; | ||
144 | unsigned char byte = 0; | ||
145 | |||
146 | SDA_HI_IN; | ||
147 | /* clock in each bit, MSB first */ | ||
148 | for ( i=0x80; i; i>>=1 ) { | ||
149 | DELAY; | ||
150 | SCL_HI; | ||
151 | DELAY; | ||
152 | if ( SDA ) | ||
153 | byte |= i; | ||
154 | SCL_LO; | ||
155 | } | ||
156 | |||
157 | return byte; | ||
158 | } | ||
159 | |||
160 | int fmradio_i2c_write(int address, const unsigned char* buf, int count) | ||
161 | { | ||
162 | int i,x=0; | ||
163 | |||
164 | fmradio_i2c_start(); | ||
165 | fmradio_i2c_outb(address & 0xfe); | ||
166 | if (fmradio_i2c_getack()) | ||
167 | { | ||
168 | for (i=0; i<count; i++) | ||
169 | { | ||
170 | fmradio_i2c_outb(buf[i]); | ||
171 | if (!fmradio_i2c_getack()) | ||
172 | { | ||
173 | x=-2; | ||
174 | break; | ||
175 | } | ||
176 | } | ||
177 | } | ||
178 | else | ||
179 | { | ||
180 | logf("fmradio_i2c_write() - no ack\n"); | ||
181 | x=-1; | ||
182 | } | ||
183 | fmradio_i2c_stop(); | ||
184 | return x; | ||
185 | } | ||
186 | |||
187 | int fmradio_i2c_read(int address, unsigned char* buf, int count) | ||
188 | { | ||
189 | int i,x=0; | ||
190 | |||
191 | fmradio_i2c_start(); | ||
192 | fmradio_i2c_outb(address | 1); | ||
193 | |||
194 | if (fmradio_i2c_getack()) | ||
195 | { | ||
196 | for (i=count; i>0; i--) | ||
197 | { | ||
198 | *buf++ = fmradio_i2c_inb(); | ||
199 | fmradio_i2c_ack(i == 1); | ||
200 | } | ||
201 | } | ||
202 | else | ||
203 | x=-1; | ||
204 | fmradio_i2c_stop(); | ||
205 | return x; | ||
206 | } | ||