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29 * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
33 * \brief I2C generic driver functions.
35 * \author Francesco Sacchi <batt@develer.com>
37 * $WIZ$ module_name = "i2c"
38 * $WIZ$ module_configuration = "bertos/cfg/cfg_i2c.h"
39 * $WIZ$ module_hw = "bertos/hw/hw_i2c_bitbang.h"
40 * $WIZ$ module_supports = "not atmega103 and not atmega168 and not at91"
46 #include "cfg/cfg_i2c.h"
48 #include <cfg/compiler.h>
49 #include <cfg/macros.h>
50 #include <cfg/debug.h>
54 #define I2C_READBIT BV(0)
57 #define i2c_init(...) PP_CAT(i2c_init ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
58 #define i2c_start_w(...) PP_CAT(i2c_start_w ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
59 #define i2c_start_r(...) PP_CAT(i2c_start_r ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
61 #define i2c_init(args...) PP_CAT(i2c_init ## _, COUNT_PARMS(args)) (args)
62 #define i2c_start_w(args...) PP_CAT(i2c_start_w ## _, COUNT_PARMS(args)) (args)
63 #define i2c_start_r(args...) PP_CAT(i2c_start_r ## _, COUNT_PARMS(args)) (args)
68 * Sometimes your cpu does not have a builtin
69 * i2c driver or you don't want, for some reason, to
71 * With this you can choose, at compile time, which backend to use.
73 * $WIZ$ i2c_backend = "I2C_BACKEND_BUILTIN", "I2C_BACKEND_BITBANG"
75 #define I2C_BACKEND_BUILTIN 0 ///< Uses cpu builtin i2c driver
76 #define I2C_BACKEND_BITBANG 1 ///< Uses emulated bitbang driver
79 * I2c builtin prototypes.
80 * Do NOT use these function directly, instead,
81 * you can call the ones named without "_builtin_"
82 * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
83 * that you want the builtin backend.
86 void i2c_builtin_init(void);
87 bool i2c_builtin_start_w(uint8_t id);
88 bool i2c_builtin_start_r(uint8_t id);
89 void i2c_builtin_stop(void);
90 bool i2c_builtin_put(uint8_t _data);
91 int i2c_builtin_get(bool ack);
95 * I2c bitbang prototypes.
96 * Same thing here: do NOT use these function directly, instead,
97 * you can call the ones named without "_bitbang_"
98 * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
99 * that you want the bitbang backend.
102 void i2c_bitbang_init(void);
103 bool i2c_bitbang_start_w(uint8_t id);
104 bool i2c_bitbang_start_r(uint8_t id);
105 void i2c_bitbang_stop(void);
106 bool i2c_bitbang_put(uint8_t _data);
107 int i2c_bitbang_get(bool ack);
110 #if CONFIG_I2C_BACKEND == I2C_BACKEND_BUILTIN
111 #define i2c_init_0 i2c_builtin_init
112 #define i2c_start_w_1 i2c_builtin_start_w
113 #define i2c_start_r_1 i2c_builtin_start_r
114 #define i2c_stop i2c_builtin_stop
115 #define i2c_put i2c_builtin_put
116 #define i2c_get i2c_builtin_get
117 #elif CONFIG_I2C_BACKEND == I2C_BACKEND_BITBANG
118 #define i2c_init_0 i2c_bitbang_init
119 #define i2c_start_w_1 i2c_bitbang_start_w
120 #define i2c_start_r_1 i2c_bitbang_start_r
121 #define i2c_stop i2c_bitbang_stop
122 #define i2c_put i2c_bitbang_put
123 #define i2c_get i2c_bitbang_get
125 #error Unsupported i2c backend.
129 bool i2c_send(const void *_buf, size_t count);
130 bool i2c_recv(void *_buf, size_t count);
140 #define I2C_OK 0 ///< I2C no errors flag
141 #define I2C_DATA_NACK BV(4) ///< I2C generic error
142 #define I2C_ERR BV(3) ///< I2C generic error
143 #define I2C_ARB_LOST BV(2) ///< I2C arbitration lost error
144 #define I2C_START_TIMEOUT BV(0) ///< I2C timeout error on start
145 #define I2C_NO_ACK BV(1) ///< I2C no ack for sla start
150 #define I2C_NOSTOP 0 ///< Do not program the stop for current transition
151 #define I2C_STOP BV(0) ///< Program the stop for current transition
152 #define I2C_START_R BV(1) ///< Start read command
153 #define I2C_START_W 0 ///< Start write command
156 #define I2C_TEST_START(flag) ((flag) & I2C_START_R)
157 #define I2C_TEST_STOP(flag) ((flag) & I2C_STOP)
162 typedef void (*i2c_start_t)(struct I2c *i2c, uint16_t slave_addr);
163 typedef uint8_t (*i2c_getc_t)(struct I2c *i2c);
164 typedef void (*i2c_putc_t)(struct I2c *i2c, uint8_t data);
165 typedef void (*i2c_write_t)(struct I2c *i2c, const void *_buf, size_t count);
166 typedef void (*i2c_read_t)(struct I2c *i2c, void *_buf, size_t count);
182 struct I2cHardware* hw;
183 const struct I2cVT *vt;
187 #include CPU_HEADER(i2c)
190 * Low level i2c init implementation prototype.
192 void i2c_hw_init(I2c *i2c, int dev, uint32_t clock);
194 void i2c_genericWrite(I2c *i2c, const void *_buf, size_t count);
195 void i2c_genericRead(I2c *i2c, void *_buf, size_t count);
197 INLINE void i2c_start(I2c *i2c, uint16_t slave_addr, size_t size)
200 ASSERT(i2c->vt->start);
203 ASSERT(i2c->xfer_size == 0);
206 i2c->xfer_size = size;
208 i2c->vt->start(i2c, slave_addr);
211 INLINE void i2c_start_r_4(I2c *i2c, uint16_t slave_addr, size_t size, int flags)
214 i2c->flags = flags | I2C_START_R;
215 i2c_start(i2c, slave_addr, size);
218 INLINE void i2c_start_w_4(I2c *i2c, uint16_t slave_addr, size_t size, int flags)
221 i2c->flags = flags & ~I2C_START_R;
222 i2c_start(i2c, slave_addr, size);
225 INLINE uint8_t i2c_getc(I2c *i2c)
229 ASSERT(i2c->vt->getc);
231 ASSERT(i2c->xfer_size);
233 ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_R);
237 uint8_t data = i2c->vt->getc(i2c);
245 INLINE void i2c_putc(I2c *i2c, uint8_t data)
249 ASSERT(i2c->vt->putc);
251 ASSERT(i2c->xfer_size);
253 ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_W);
257 i2c->vt->putc(i2c, data);
262 INLINE void i2c_write(I2c *i2c, const void *_buf, size_t count)
266 ASSERT(i2c->vt->write);
270 ASSERT(count <= i2c->xfer_size);
272 ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_W);
275 i2c->vt->write(i2c, _buf, count);
279 INLINE void i2c_read(I2c *i2c, void *_buf, size_t count)
283 ASSERT(i2c->vt->read);
287 ASSERT(count <= i2c->xfer_size);
289 ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_R);
292 i2c->vt->read(i2c, _buf, count);
295 INLINE int i2c_error(I2c *i2c)
298 int err = i2c->errors;
304 INLINE void i2c_init_3(I2c *i2c, int dev, uint32_t clock)
306 i2c_hw_init(i2c, dev, clock);