bertos/drv/i2c.h

   1 /**
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  25  * the GNU General Public License.  This exception does not however
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  27  * the GNU General Public License.
  28  *
  29  * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
  30  *
  31  * -->
  32  *
  33  * \brief I2C generic driver functions.
  34  *
  35  * \author Francesco Sacchi <batt@develer.com>
  36  *
  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"
  41  */
  42
  43 #ifndef DRV_I2C_H
  44 #define DRV_I2C_H
  45
  46 #include "cfg/cfg_i2c.h"
  47 #include <cfg/compiler.h>
  48
  49 #define I2C_READBIT BV(0)
  50
  51 /**
  52  * I2C Backends.
  53  * Sometimes your cpu does not have a builtin
  54  * i2c driver or you don't want, for some reason, to
  55  * use that.
  56  * With this you can choose, at compile time, which backend to use.
  57  *
  58  * $WIZ$ i2c_backend = "I2C_BACKEND_BUILTIN", "I2C_BACKEND_BITBANG"
  59  */
  60 #define I2C_BACKEND_BUILTIN 0 ///< Uses cpu builtin i2c driver
  61 #define I2C_BACKEND_BITBANG 1 ///< Uses emulated bitbang driver
  62
  63
  64 /**
  65  * I2c builtin prototypes.
  66  * Do NOT use these function directly, instead,
  67  * you can call the ones named without "_builtin_"
  68  * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
  69  * that you want the builtin backend.
  70  * \{
  71  */
  72 void i2c_builtin_init(void);
  73 bool i2c_builtin_start_w(uint8_t id);
  74 bool i2c_builtin_start_r(uint8_t id);
  75 void i2c_builtin_stop(void);
  76 bool i2c_builtin_put(uint8_t _data);
  77 int i2c_builtin_get(bool ack);
  78 /*\}*/
  79
  80 /**
  81  * I2c bitbang prototypes.
  82  * Same thing here: do NOT use these function directly, instead,
  83  * you can call the ones named without "_bitbang_"
  84  * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
  85  * that you want the bitbang backend.
  86  * \{
  87  */
  88 void i2c_bitbang_init(void);
  89 bool i2c_bitbang_start_w(uint8_t id);
  90 bool i2c_bitbang_start_r(uint8_t id);
  91 void i2c_bitbang_stop(void);
  92 bool i2c_bitbang_put(uint8_t _data);
  93 int i2c_bitbang_get(bool ack);
  94 /*\}*/
  95
  96 #if CONFIG_I2C_BACKEND == I2C_BACKEND_BUILTIN
  97         #define i2c_init    i2c_builtin_init
  98         #define i2c_start_w i2c_builtin_start_w
  99         #define i2c_start_r i2c_builtin_start_r
 100         #define i2c_stop    i2c_builtin_stop
 101         #define i2c_put     i2c_builtin_put
 102         #define i2c_get     i2c_builtin_get
 103 #elif CONFIG_I2C_BACKEND == I2C_BACKEND_BITBANG
 104         #define i2c_init    i2c_bitbang_init
 105         #define i2c_start_w i2c_bitbang_start_w
 106         #define i2c_start_r i2c_bitbang_start_r
 107         #define i2c_stop    i2c_bitbang_stop
 108         #define i2c_put     i2c_bitbang_put
 109         #define i2c_get     i2c_bitbang_get
 110 #else
 111         #error Unsupported i2c backend.
 112 #endif
 113
 114 bool i2c_send(const void *_buf, size_t count);
 115 bool i2c_recv(void *_buf, size_t count);
 116
 117
 118
 119
 120 /*
 121  * I2c new api
 122  *
 123  */
 124 #include CPU_HEADER(i2c)
 125
 126 struct I2cHardware;
 127 typedef int (*i2c_writeRope_t)(I2c *i2c, uint16_t slave_addr, int flags, const void *buf, size_t len, ...);
 128 typedef int (*i2c_readRope_t)(I2c *i2c, uint16_t slave_addr, int flags, void *buf, size_t len, ...);
 129
 130 typedef struct I2c
 131 {
 132         int dev;
 133         i2c_writeRope_t write;
 134         i2c_readRope_t read;
 135
 136         struct I2cHardware* hw;
 137 } I2c;
 138
 139 void i2c_init(I2c *i2c, int dev, uint32_t clock);
 140
 141 #define i2c_write(FN_ARGS) CAT(fn ## _, COUNT_PARMS(FN_ARGS)) (FN_ARGS)
 142 #define i2c_read(FN_ARGS) CAT(fn ## _, COUNT_PARMS(FN_ARGS)) (FN_ARGS)
 143
 144 /*
 145  * Overloaded functions definition.
 146  */
 147 int i2c_write_5(I2c *i2c, uint16_t slave_addr, int flags, const void *buf, size_t len);
 148 int i2c_read_5(I2c *i2c, uint16_t slave_addr, int flags, void *buf, size_t len);
 149
 150 int i2c_write_7(I2c *i2c, uint16_t slave_addr, int flags, const void *buf, size_t len,
 151                                                                                                                   const void *buf1, size_t len1);
 152 int i2c_read_7(I2c *i2c, uint16_t slave_addr, int flags, void *buf, size_t len,
 153                                                                                                                  void *buf1, size_t len1);
 154
 155 int i2c_write_9(I2c *i2c, uint16_t slave_addr, int flags, const void *buf, size_t len,
 156                                                                                                                   const void *buf1, size_t len1,
 157                                                                                                                   const void *buf2, size_t len2);
 158 int i2c_read_9(I2c *i2c, uint16_t slave_addr, int flags, void *buf, size_t len,
 159                                                                                                                  void *buf1, size_t len1,
 160                                                                                                                  void *buf2, size_t len2);
 161
 162 int i2c_write_11(I2c *i2c, uint16_t slave_addr, int flags, const void *buf, size_t len,
 163                                                                                                                   const void *buf1, size_t len1,
 164                                                                                                                   const void *buf2, size_t len2
 165                                                                                                                   const void *buf3, size_t len3);
 166 int i2c_read_11(I2c *i2c, uint16_t slave_addr, int flags, void *buf, size_t len,
 167                                                                                                                  void *buf1, size_t len1,
 168                                                                                                                  void *buf2, size_t len2
 169                                                                                                                  void *buf3, size_t len3);
 170
 171
 172 #endif