aboutsummaryrefslogtreecommitdiffstats
path: root/os/hal/platforms/AT91SAM7/spi_lld.h
blob: 8949a170335d5d4796c5cdc868c117abff415bce (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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011 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/>.
*/

/**
 * @file    AT91SAM7/spi_lld.h
 * @brief   AT91SAM7 low level SPI driver header.
 *
 * @addtogroup SPI
 * @{
 */

#ifndef _SPI_LLD_H_
#define _SPI_LLD_H_

#if HAL_USE_SPI || defined(__DOXYGEN__)

/*===========================================================================*/
/* Device compatibility..                                                    */
/*===========================================================================*/

#if defined (AT91C_BASE_SPI)
#define AT91C_BASE_SPI0                 AT91C_BASE_SPI
#define AT91C_ID_SPI0                   AT91C_ID_SPI

#define SPI0_MISO                       (1 << 12)
#define SPI0_MOSI                       (1 << 13)
#define SPI0_SCK                        (1 << 14)
#else
#define SPI0_MISO                       (1 << 16)
#define SPI0_MOSI                       (1 << 17)
#define SPI0_SCK                        (1 << 18)

#define SPI1_MISO                       (1 << 24)
#define SPI1_MOSI                       (1 << 23)
#define SPI1_SCK                        (1 << 22)
#endif

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

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

/**
 * @brief   SPID1 enable switch (SPI0 device).
 * @details If set to @p TRUE the support for SPI0 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(AT91SAM7_SPI_USE_SPI0) || defined(__DOXYGEN__)
#define AT91SAM7_SPI_USE_SPI0           TRUE
#endif

/**
 * @brief   SPID2 enable switch (SPI1 device).
 * @details If set to @p TRUE the support for SPI1 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(AT91SAM7_SPI_USE_SPI1) || defined(__DOXYGEN__)
#define AT91SAM7_SPI_USE_SPI1           TRUE
#endif

/**
 * @brief   SPI0 device interrupt priority level setting.
 */
#if !defined(AT91SAM7_SPI0_PRIORITY) || defined(__DOXYGEN__)
#define AT91SAM7_SPI0_PRIORITY          (AT91C_AIC_PRIOR_HIGHEST - 1)
#endif

/**
 * @brief   SPI1 device interrupt priority level setting.
 */
#if !defined(AT91SAM7_SPI1_PRIORITY) || defined(__DOXYGEN__)
#define AT91SAM7_SPI1_PRIORITY          (AT91C_AIC_PRIOR_HIGHEST - 1)
#endif

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

#if defined (AT91C_BASE_SPI) && AT91SAM7_SPI_USE_SPI1
#error "SPI1 not present"
#endif

#if !AT91SAM7_SPI_USE_SPI0 && !AT91SAM7_SPI_USE_SPI1
#error "SPI driver activated but no SPI peripheral assigned"
#endif

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

/**
 * @brief   Type of a structure representing an SPI driver.
 */
typedef struct SPIDriver SPIDriver;

/**
 * @brief   SPI notification callback type.
 *
 * @param[in] spip      pointer to the @p SPIDriver object triggering the
 *                      callback
 */
typedef void (*spicallback_t)(SPIDriver *spip);

/**
 * @brief   Driver configuration structure.
 */
typedef struct {
  /**
   * @brief Operation complete callback or @p NULL.
   */
  spicallback_t         end_cb;
  /* End of the mandatory fields.*/
  /**
   * @brief The chip select line port.
   */
  ioportid_t            ssport;
  /**
   * @brief The chip select line pad number.
   */
  uint16_t              sspad;
  /**
   * @brief SPI Chip Select Register initialization data.
   */
  uint32_t              csr;
} SPIConfig;

/**
 * @brief Structure representing a SPI driver.
 */
struct SPIDriver {
  /**
   * @brief Driver state.
   */
  spistate_t            state;
  /**
   * @brief Current configuration data.
   */
  const SPIConfig       *config;
#if SPI_USE_WAIT || defined(__DOXYGEN__)
  /**
   * @brief Waiting thread.
   */
  Thread                *thread;
#endif /* SPI_USE_WAIT */
#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
  /**
   * @brief Mutex protecting the bus.
   */
  Mutex                 mutex;
#elif CH_USE_SEMAPHORES
  Semaphore             semaphore;
#endif
#endif /* SPI_USE_MUTUAL_EXCLUSION */
#if defined(SPI_DRIVER_EXT_FIELDS)
  SPI_DRIVER_EXT_FIELDS
#endif
  /* End of the mandatory fields.*/
  /**
   * @brief Pointer to the SPIx registers block.
   */
  AT91PS_SPI            spi;
};

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

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

#if AT91SAM7_SPI_USE_SPI0 && !defined(__DOXYGEN__)
extern SPIDriver SPID1;
#endif

#if AT91SAM7_SPI_USE_SPI1 && !defined(__DOXYGEN__)
extern SPIDriver SPID2;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void spi_lld_init(void);
  void spi_lld_start(SPIDriver *spip);
  void spi_lld_stop(SPIDriver *spip);
  void spi_lld_select(SPIDriver *spip);
  void spi_lld_unselect(SPIDriver *spip);
  void spi_lld_ignore(SPIDriver *spip, size_t n);
  void spi_lld_exchange(SPIDriver *spip, size_t n,
                        const void *txbuf, void *rxbuf);
  void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);
  void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);
  uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_SPI */

#endif /* _SPI_LLD_H_ */

/** @} */