diff options
Diffstat (limited to 'firmware/target/sh/archos')
-rw-r--r-- | firmware/target/sh/archos/ondio/fmradio_i2c-ondio.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/firmware/target/sh/archos/ondio/fmradio_i2c-ondio.c b/firmware/target/sh/archos/ondio/fmradio_i2c-ondio.c new file mode 100644 index 0000000000..f62797480a --- /dev/null +++ b/firmware/target/sh/archos/ondio/fmradio_i2c-ondio.c | |||
@@ -0,0 +1,197 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id:$ | ||
9 | * Physical interface of the Philips TEA5767 in Archos Ondio | ||
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 | #if (CONFIG_TUNER & TEA5767) | ||
26 | |||
27 | /* cute little functions, atomic read-modify-write */ | ||
28 | /* SDA is PB4 */ | ||
29 | #define SDA_LO and_b(~0x10, &PBDRL) | ||
30 | #define SDA_HI or_b(0x10, &PBDRL) | ||
31 | #define SDA_INPUT and_b(~0x10, &PBIORL) | ||
32 | #define SDA_OUTPUT or_b(0x10, &PBIORL) | ||
33 | #define SDA (PBDR & 0x0010) | ||
34 | |||
35 | /* SCL is PB1 */ | ||
36 | #define SCL_INPUT and_b(~0x02, &PBIORL) | ||
37 | #define SCL_OUTPUT or_b(0x02, &PBIORL) | ||
38 | #define SCL_LO and_b(~0x02, &PBDRL) | ||
39 | #define SCL_HI or_b(0x02, &PBDRL) | ||
40 | #define SCL (PBDR & 0x0002) | ||
41 | |||
42 | /* arbitrary delay loop */ | ||
43 | #define DELAY do { int _x; for(_x=0;_x<20;_x++);} while (0) | ||
44 | |||
45 | static void fmradio_i2c_start(void) | ||
46 | { | ||
47 | SDA_OUTPUT; | ||
48 | SDA_HI; | ||
49 | SCL_HI; | ||
50 | SDA_LO; | ||
51 | DELAY; | ||
52 | SCL_LO; | ||
53 | } | ||
54 | |||
55 | static void fmradio_i2c_stop(void) | ||
56 | { | ||
57 | SDA_LO; | ||
58 | SCL_HI; | ||
59 | DELAY; | ||
60 | SDA_HI; | ||
61 | } | ||
62 | |||
63 | |||
64 | static void fmradio_i2c_ack(bool nack) | ||
65 | { | ||
66 | /* Here's the deal. The slave is slow, and sometimes needs to wait | ||
67 | before it can receive the acknowledge. Therefore it forces the clock | ||
68 | low until it is ready. We need to poll the clock line until it goes | ||
69 | high before we release the ack. */ | ||
70 | |||
71 | SCL_LO; /* Set the clock low */ | ||
72 | |||
73 | if (nack) | ||
74 | SDA_HI; | ||
75 | else | ||
76 | SDA_LO; | ||
77 | |||
78 | SCL_INPUT; /* Set the clock to input */ | ||
79 | while(!SCL) /* and wait for the slave to release it */ | ||
80 | sleep_thread(0); | ||
81 | |||
82 | DELAY; | ||
83 | SCL_OUTPUT; | ||
84 | SCL_LO; | ||
85 | } | ||
86 | |||
87 | static int fmradio_i2c_getack(void) | ||
88 | { | ||
89 | int ret = 1; | ||
90 | |||
91 | /* Here's the deal. The slave is slow, and sometimes needs to wait | ||
92 | before it can send the acknowledge. Therefore it forces the clock | ||
93 | low until it is ready. We need to poll the clock line until it goes | ||
94 | high before we read the ack. */ | ||
95 | |||
96 | SDA_INPUT; /* And set to input */ | ||
97 | SCL_INPUT; /* Set the clock to input */ | ||
98 | while(!SCL) /* and wait for the slave to release it */ | ||
99 | sleep_thread(0); | ||
100 | |||
101 | if (SDA) | ||
102 | /* ack failed */ | ||
103 | ret = 0; | ||
104 | |||
105 | SCL_OUTPUT; | ||
106 | SCL_LO; | ||
107 | SDA_HI; | ||
108 | SDA_OUTPUT; | ||
109 | return ret; | ||
110 | } | ||
111 | |||
112 | static void fmradio_i2c_outb(unsigned char byte) | ||
113 | { | ||
114 | int i; | ||
115 | |||
116 | /* clock out each bit, MSB first */ | ||
117 | for ( i=0x80; i; i>>=1 ) { | ||
118 | if ( i & byte ) | ||
119 | { | ||
120 | SDA_HI; | ||
121 | } | ||
122 | else | ||
123 | { | ||
124 | SDA_LO; | ||
125 | } | ||
126 | SCL_HI; | ||
127 | SCL_LO; | ||
128 | } | ||
129 | |||
130 | SDA_HI; | ||
131 | } | ||
132 | |||
133 | static unsigned char fmradio_i2c_inb(void) | ||
134 | { | ||
135 | int i; | ||
136 | unsigned char byte = 0; | ||
137 | |||
138 | /* clock in each bit, MSB first */ | ||
139 | for ( i=0x80; i; i>>=1 ) { | ||
140 | SDA_INPUT; /* And set to input */ | ||
141 | SCL_HI; | ||
142 | if ( SDA ) | ||
143 | byte |= i; | ||
144 | SCL_LO; | ||
145 | SDA_OUTPUT; | ||
146 | } | ||
147 | |||
148 | return byte; | ||
149 | } | ||
150 | |||
151 | int fmradio_i2c_write(int address, const unsigned char* buf, int count) | ||
152 | { | ||
153 | int i,x=0; | ||
154 | |||
155 | fmradio_i2c_start(); | ||
156 | fmradio_i2c_outb(address & 0xfe); | ||
157 | if (fmradio_i2c_getack()) | ||
158 | { | ||
159 | for (i=0; i<count; i++) | ||
160 | { | ||
161 | fmradio_i2c_outb(buf[i]); | ||
162 | if (!fmradio_i2c_getack()) | ||
163 | { | ||
164 | x=-2; | ||
165 | break; | ||
166 | } | ||
167 | } | ||
168 | } | ||
169 | else | ||
170 | { | ||
171 | logf("fmradio_i2c_write() - no ack\n"); | ||
172 | x=-1; | ||
173 | } | ||
174 | fmradio_i2c_stop(); | ||
175 | return x; | ||
176 | } | ||
177 | |||
178 | int fmradio_i2c_read(int address, unsigned char* buf, int count) | ||
179 | { | ||
180 | int i,x=0; | ||
181 | |||
182 | fmradio_i2c_start(); | ||
183 | fmradio_i2c_outb(address | 1); | ||
184 | if (fmradio_i2c_getack()) { | ||
185 | for (i=count; i>0; i--) | ||
186 | { | ||
187 | *buf++ = fmradio_i2c_inb(); | ||
188 | fmradio_i2c_ack(i == 1); | ||
189 | } | ||
190 | } | ||
191 | else | ||
192 | x=-1; | ||
193 | fmradio_i2c_stop(); | ||
194 | return x; | ||
195 | } | ||
196 | |||
197 | #endif | ||