aboutsummaryrefslogtreecommitdiffstats
path: root/os/hal/include/i2c.h
blob: b70767609807c0217dadbbe579367aba7e6fbf77 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012,2013 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
/*
   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
   aka barthess.
 */

/**
 * @file    i2c.h
 * @brief   I2C Driver macros and structures.
 *
 * @addtogroup I2C
 * @{
 */

#ifndef _I2C_H_
#define _I2C_H_

#if HAL_USE_I2C || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver constants.                                                         */
/*===========================================================================*/

/* TODO: To be reviewed, too STM32-centric.*/
/**
 * @name    I2C bus error conditions
 * @{
 */
#define I2C_NO_ERROR               0x00    /**< @brief No error.            */
#define I2C_BUS_ERROR              0x01    /**< @brief Bus Error.           */
#define I2C_ARBITRATION_LOST       0x02    /**< @brief Arbitration Lost.    */
#define I2C_ACK_FAILURE            0x04    /**< @brief Acknowledge Failure. */
#define I2C_OVERRUN                0x08    /**< @brief Overrun/Underrun.    */
#define I2C_PEC_ERROR              0x10    /**< @brief PEC Error in
                                                reception.                  */
#define I2C_TIMEOUT                0x20    /**< @brief Hardware timeout.    */
#define I2C_SMB_ALERT              0x40    /**< @brief SMBus Alert.         */
/** @} */

/*===========================================================================*/
/* Driver pre-compile time settings.                                         */
/*===========================================================================*/

/**
 * @brief   Enables the mutual exclusion APIs on the I2C bus.
 */
#if !defined(I2C_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define I2C_USE_MUTUAL_EXCLUSION    TRUE
#endif

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

/*===========================================================================*/
/* Driver data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   Driver state machine possible states.
 */
typedef enum {
  I2C_UNINIT = 0,                           /**< Not initialized.           */
  I2C_STOP = 1,                             /**< Stopped.                   */
  I2C_READY = 2,                            /**< Ready.                     */
  I2C_ACTIVE_TX = 3,                        /**< Transmitting.              */
  I2C_ACTIVE_RX = 4,                        /**< Receiving.                 */
  I2C_LOCKED = 5                            /**> Bus or driver locked.      */
} i2cstate_t;

#include "i2c_lld.h"

/*===========================================================================*/
/* Driver macros.                                                            */
/*===========================================================================*/

/**
 * @brief   Wrap i2cMasterTransmitTimeout function with TIME_INFINITE timeout.
 * @api
 */
#define i2cMasterTransmit(i2cp, addr, txbuf, txbytes, rxbuf, rxbytes)       \
  (i2cMasterTransmitTimeout(i2cp, addr, txbuf, txbytes, rxbuf, rxbytes,     \
                            TIME_INFINITE))

/**
 * @brief   Wrap i2cMasterReceiveTimeout function with TIME_INFINITE timeout.
 * @api
 */
#define i2cMasterReceive(i2cp, addr, rxbuf, rxbytes)                        \
  (i2cMasterReceiveTimeout(i2cp, addr, rxbuf, rxbytes, TIME_INFINITE))

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#ifdef __cplusplus
extern "C" {
#endif
  void i2cInit(void);
  void i2cObjectInit(I2CDriver *i2cp);
  void i2cStart(I2CDriver *i2cp, const I2CConfig *config);
  void i2cStop(I2CDriver *i2cp);
  i2cflags_t i2cGetErrors(I2CDriver *i2cp);
  msg_t i2cMasterTransmitTimeout(I2CDriver *i2cp,
                                 i2caddr_t addr,
                                 const uint8_t *txbuf, size_t txbytes,
                                 uint8_t *rxbuf, size_t rxbytes,
                                 systime_t timeout);
  msg_t i2cMasterReceiveTimeout(I2CDriver *i2cp,
                                i2caddr_t addr,
                                uint8_t *rxbuf, size_t rxbytes,
                                systime_t timeout);
#if I2C_USE_MUTUAL_EXCLUSION
  void i2cAcquireBus(I2CDriver *i2cp);
  void i2cReleaseBus(I2CDriver *i2cp);
#endif /* I2C_USE_MUTUAL_EXCLUSION */

#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_I2C */

#endif /* _I2C_H_ */

/** @} */