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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_depends = "i2c_bitbang"
41 * $WIZ$ module_supports = "not atmega103 and not atmega168 and not at91"
47 #include "cfg/cfg_i2c.h"
49 #include <cfg/compiler.h>
50 #include <cfg/macros.h>
51 #include <cfg/debug.h>
55 #define I2C_READBIT BV(0)
58 #define i2c_init(...) PP_CAT(i2c_init ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
59 #define i2c_start_w(...) PP_CAT(i2c_start_w ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
60 #define i2c_start_r(...) PP_CAT(i2c_start_r ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
62 #define i2c_init(args...) PP_CAT(i2c_init ## _, COUNT_PARMS(args)) (args)
63 #define i2c_start_w(args...) PP_CAT(i2c_start_w ## _, COUNT_PARMS(args)) (args)
64 #define i2c_start_r(args...) PP_CAT(i2c_start_r ## _, COUNT_PARMS(args)) (args)
68 #if !CONFIG_I2C_DISABLE_OLD_API
71 * Sometimes your cpu does not have a builtin
72 * i2c driver or you don't want, for some reason, to
74 * With this you can choose, at compile time, which backend to use.
76 #define I2C_BACKEND_BUILTIN 0 ///< Uses cpu builtin i2c driver
77 #define I2C_BACKEND_BITBANG 1 ///< Uses emulated bitbang driver
80 * I2c builtin prototypes.
81 * Do NOT use these function directly, instead,
82 * you can call the ones named without "_builtin_"
83 * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
84 * that you want the builtin backend.
87 void i2c_builtin_init(void);
88 bool i2c_builtin_start_w(uint8_t id);
89 bool i2c_builtin_start_r(uint8_t id);
90 void i2c_builtin_stop(void);
91 bool i2c_builtin_put(uint8_t _data);
92 int i2c_builtin_get(bool ack);
96 * I2c bitbang prototypes.
97 * Same thing here: do NOT use these function directly, instead,
98 * you can call the ones named without "_bitbang_"
99 * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
100 * that you want the bitbang backend.
103 void i2c_bitbang_init(void);
104 bool i2c_bitbang_start_w(uint8_t id);
105 bool i2c_bitbang_start_r(uint8_t id);
106 void i2c_bitbang_stop(void);
107 bool i2c_bitbang_put(uint8_t _data);
108 int i2c_bitbang_get(bool ack);
111 #ifndef CONFIG_I2C_BACKEND
112 #define CONFIG_I2C_BACKEND I2C_BACKEND_BUILTIN
115 #if CONFIG_I2C_BACKEND == I2C_BACKEND_BUILTIN
116 #define i2c_init_0 i2c_builtin_init
117 #define i2c_start_w_1 i2c_builtin_start_w
118 #define i2c_start_r_1 i2c_builtin_start_r
119 #define i2c_stop i2c_builtin_stop
120 #define i2c_put i2c_builtin_put
121 #define i2c_get i2c_builtin_get
122 #elif CONFIG_I2C_BACKEND == I2C_BACKEND_BITBANG
123 #define i2c_init_0 i2c_bitbang_init
124 #define i2c_start_w_1 i2c_bitbang_start_w
125 #define i2c_start_r_1 i2c_bitbang_start_r
126 #define i2c_stop i2c_bitbang_stop
127 #define i2c_put i2c_bitbang_put
128 #define i2c_get i2c_bitbang_get
130 #error Unsupported i2c backend.
134 bool i2c_send(const void *_buf, size_t count);
135 bool i2c_recv(void *_buf, size_t count);
144 * \name I2C bitbang devices enum
159 I2C_BITBANG_CNT /**< Number of serial ports */
165 #define I2C_OK 0 ///< I2C no errors flag
166 #define I2C_DATA_NACK BV(4) ///< I2C generic error
167 #define I2C_ERR BV(3) ///< I2C generic error
168 #define I2C_ARB_LOST BV(2) ///< I2C arbitration lost error
169 #define I2C_START_TIMEOUT BV(0) ///< I2C timeout error on start
170 #define I2C_NO_ACK BV(1) ///< I2C no ack for sla start
175 #define I2C_NOSTOP 0 ///< Do not program the stop for current transition
176 #define I2C_STOP BV(0) ///< Program the stop for current transition
177 #define I2C_START_R BV(1) ///< Start read command
178 #define I2C_START_W 0 ///< Start write command
181 #define I2C_TEST_START(flag) ((flag) & I2C_START_R)
182 #define I2C_TEST_STOP(flag) ((flag) & I2C_STOP)
187 typedef void (*i2c_start_t)(struct I2c *i2c, uint16_t slave_addr);
188 typedef uint8_t (*i2c_getc_t)(struct I2c *i2c);
189 typedef void (*i2c_putc_t)(struct I2c *i2c, uint8_t data);
190 typedef void (*i2c_write_t)(struct I2c *i2c, const void *_buf, size_t count);
191 typedef void (*i2c_read_t)(struct I2c *i2c, void *_buf, size_t count);
207 struct I2cHardware* hw;
208 const struct I2cVT *vt;
212 #include CPU_HEADER(i2c)
215 * Low level i2c init implementation prototype.
217 void i2c_hw_init(I2c *i2c, int dev, uint32_t clock);
218 void i2c_hw_bitbangInit(I2c *i2c, int dev);
220 void i2c_genericWrite(I2c *i2c, const void *_buf, size_t count);
221 void i2c_genericRead(I2c *i2c, void *_buf, size_t count);
223 INLINE void i2c_start(I2c *i2c, uint16_t slave_addr, size_t size)
226 ASSERT(i2c->vt->start);
229 ASSERT(i2c->xfer_size == 0);
232 i2c->xfer_size = size;
234 i2c->vt->start(i2c, slave_addr);
237 INLINE void i2c_start_r_4(I2c *i2c, uint16_t slave_addr, size_t size, int flags)
240 i2c->flags = flags | I2C_START_R;
241 i2c_start(i2c, slave_addr, size);
244 INLINE void i2c_start_w_4(I2c *i2c, uint16_t slave_addr, size_t size, int flags)
247 i2c->flags = flags & ~I2C_START_R;
248 i2c_start(i2c, slave_addr, size);
251 INLINE uint8_t i2c_getc(I2c *i2c)
255 ASSERT(i2c->vt->getc);
257 ASSERT(i2c->xfer_size);
259 ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_R);
263 uint8_t data = i2c->vt->getc(i2c);
271 INLINE void i2c_putc(I2c *i2c, uint8_t data)
275 ASSERT(i2c->vt->putc);
277 ASSERT(i2c->xfer_size);
279 ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_W);
283 i2c->vt->putc(i2c, data);
288 INLINE void i2c_write(I2c *i2c, const void *_buf, size_t count)
292 ASSERT(i2c->vt->write);
296 ASSERT(count <= i2c->xfer_size);
298 ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_W);
301 i2c->vt->write(i2c, _buf, count);
305 INLINE void i2c_read(I2c *i2c, void *_buf, size_t count)
309 ASSERT(i2c->vt->read);
313 ASSERT(count <= i2c->xfer_size);
315 ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_R);
318 i2c->vt->read(i2c, _buf, count);
321 INLINE int i2c_error(I2c *i2c)
324 int err = i2c->errors;
330 #define i2c_init_3(i2c, dev, clock) (dev > I2C_BITBANG0) ? i2c_hw_bitbangInit(i2c, dev) : i2c_hw_init(i2c, dev, clock)