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29 * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
33 * \brief I2C generic driver functions.
36 * \author Francesco Sacchi <batt@develer.com>
41 * "configuration" : "bertos/cfg/cfg_i2c.h"
47 #include "cfg/cfg_i2c.h"
48 #include <cfg/compiler.h>
50 #define I2C_READBIT BV(0)
54 * Sometimes your cpu does not have a builtin
55 * i2c driver or you don't want, for some reason, to
57 * With this you can choose, at compile time, which backend to use.
60 * "i2c_backend" : ["I2C_BACKEND_BUILTIN", "I2C_BACKEND_BITBANG"]
63 #define I2C_BACKEND_BUILTIN 0 ///< Uses cpu builtin i2c driver
64 #define I2C_BACKEND_BITBANG 1 ///< Uses emulated bitbang driver
68 * I2c builtin prototypes.
69 * Do NOT use these function directly, instead,
70 * you can call the ones named without "_builtin_"
71 * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
72 * that you want the builtin backend.
75 void i2c_builtin_init(void);
76 bool i2c_builtin_start_w(uint8_t id);
77 bool i2c_builtin_start_r(uint8_t id);
78 void i2c_builtin_stop(void);
79 bool i2c_builtin_put(uint8_t _data);
80 int i2c_builtin_get(bool ack);
84 * I2c bitbang prototypes.
85 * Same thing here: do NOT use these function directly, instead,
86 * you can call the ones named without "_bitbang_"
87 * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
88 * that you want the bitbang backend.
91 void i2c_bitbang_init(void);
92 bool i2c_bitbang_start_w(uint8_t id);
93 bool i2c_bitbang_start_r(uint8_t id);
94 void i2c_bitbang_stop(void);
95 bool i2c_bitbang_put(uint8_t _data);
96 int i2c_bitbang_get(bool ack);
99 #if CONFIG_I2C_BACKEND == I2C_BACKEND_BUILTIN
100 #define i2c_init i2c_builtin_init
101 #define i2c_start_w i2c_builtin_start_w
102 #define i2c_start_r i2c_builtin_start_r
103 #define i2c_stop i2c_builtin_stop
104 #define i2c_put i2c_builtin_put
105 #define i2c_get i2c_builtin_get
106 #elif CONFIG_I2C_BACKEND == I2C_BACKEND_BITBANG
107 #define i2c_init i2c_bitbang_init
108 #define i2c_start_w i2c_bitbang_start_w
109 #define i2c_start_r i2c_bitbang_start_r
110 #define i2c_stop i2c_bitbang_stop
111 #define i2c_put i2c_bitbang_put
112 #define i2c_get i2c_bitbang_get
114 #error Unsupported i2c backend.
117 bool i2c_send(const void *_buf, size_t count);
118 bool i2c_recv(void *_buf, size_t count);