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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
ChibiOS/RT - Copyright (C) 2006-2007 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 AT91SAM7X/pal_lld.h
* @brief AT91SAM7X PIO low level driver header
* @addtogroup AT91SAM7X_PAL
* @{
*/
#ifndef _PAL_LLD_H_
#define _PAL_LLD_H_
#include "at91lib/AT91SAM7X256.h"
/*===========================================================================*/
/* Unsupported modes and specific modes */
/*===========================================================================*/
#undef PAL_MODE_INPUT_PULLDOWN
/*===========================================================================*/
/* I/O Ports Types and constants. */
/*===========================================================================*/
/**
* @brief PIO port setup info.
*/
typedef struct {
/** Initial value for ODSR register (data).*/
uint32_t odsr;
/** Initial value for OSR register (direction).*/
uint32_t osr;
/** Initial value for PUSR register (Pull-ups).*/
uint32_t pusr;
} at91sam7x_pio_setup_t;
/**
* @brief AT91SAM7X PIO static initializer.
* @details An instance of this structure must be passed to @p palInit() at
* system startup time in order to initialized the digital I/O
* subsystem. This represents only the initial setup, specific pads
* or whole ports can be reprogrammed at later time.
*/
typedef struct {
/** @brief Port 0 setup data.*/
at91sam7x_pio_setup_t P0Data;
/** @brief Port 1 setup data.*/
at91sam7x_pio_setup_t P1Data;
} AT91SAM7XPIOConfig;
/**
* @brief Width, in bits, of an I/O port.
*/
#define PAL_IOPORTS_WIDTH 32
/**
* @brief Digital I/O port sized unsigned type.
*/
typedef uint32_t ioportmask_t;
/**
* @brief Port Identifier.
* @details This type can be a scalar or some kind of pointer, do not make
* any assumption about it, use the provided macros when populating
* variables of this type.
*/
typedef AT91PS_PIO ioportid_t;
/*===========================================================================*/
/* I/O Ports Identifiers. */
/*===========================================================================*/
/**
* @brief PIO port A identifier.
*/
#define IOPORT1 AT91C_BASE_PIOA
/**
* @brief PIO port B identifier.
*/
#define IOPORT2 AT91C_BASE_PIOB
/*===========================================================================*/
/* Implementation, some of the following macros could be implemented as */
/* functions, if so please put them in a file named pal_lld.c. */
/*===========================================================================*/
/**
* @brief Low level PAL subsystem initialization.
*/
#define pal_lld_init(config) _pal_lld_init(config)
/**
* @brief Reads the physical I/O port states.
* @details This function is implemented by reading the PIO_PDSR register, the
* implementation has no side effects.
*
* @param[in] port the port identifier
* @return The port bits.
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define pal_lld_readport(port) ((port)->PIO_PDSR)
/**
* @brief Reads the output latch.
* @details This function is implemented by reading the PIO_ODSR register, the
* implementation has no side effects.
*
* @param[in] port the port identifier
* @return The latched logical states.
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define pal_lld_readlatch(port) ((port)->PIO_ODSR)
/**
* @brief Writes a bits mask on a I/O port.
* @details This function is implemented by writing the PIO_ODSR register, the
* implementation has no side effects.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be written on the specified port
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define pal_lld_writeport(port, bits) { \
(port)->PIO_ODSR = (bits); \
}
/**
* @brief Sets a bits mask on a I/O port.
* @details This function is implemented by writing the PIO_SODR register, the
* implementation has no side effects.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be ORed on the specified port
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define pal_lld_setport(port, bits) { \
(port)->PIO_SODR = (bits); \
}
/**
* @brief Clears a bits mask on a I/O port.
* @details This function is implemented by writing the PIO_CODR register, the
* implementation has no side effects.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be cleared on the specified port
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define pal_lld_clearport(port, bits) { \
(port)->PIO_CODR = (bits); \
}
/**
* @brief Writes a group of bits.
* @details This function is implemented by writing the PIO_OWER, PIO_ODSR and
* PIO_OWDR registers, the implementation is not atomic because the
* multiple accesses.
*
* @param[in] port the port identifier
* @param[in] mask the group mask
* @param[in] offset the group bit offset within the port
* @param[in] bits the bits to be written. Values exceeding the group width
* are masked.
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define pal_lld_writegroup(port, mask, offset, bits) { \
(port)->PIO_OWER = (mask) << (offset); \
(port)->PIO_ODSR = (bits) << (offset); \
(port)->PIO_OWDR = (mask) << (offset); \
}
/**
* @brief Pads group mode setup.
* @details This function programs a pads group belonging to the same port
* with the specified mode.
*
* @param[in] port the port identifier
* @param[in] mask the group mask
* @param[in] mode the mode
*
* @note This function is not meant to be invoked directly by the application
* code.
* @note @p PAL_MODE_UNCONNECTED is implemented as push pull output with high
* state.
*/
#define pal_lld_setgroupmode(port, mask, mode) \
_pal_lld_setgroupmode(port, mask, mode)
/**
* @brief Writes a logical state on an output pad.
*
* @param[in] port the port identifier
* @param[in] pad the pad number within the port
* @param[out] bit the logical value, the value must be @p 0 or @p 1
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define pal_lld_writepad(port, pad, bit) pal_lld_writegroup(port, 1, pad, bit)
#ifdef __cplusplus
extern "C" {
#endif
void _pal_lld_init(const AT91SAM7XPIOConfig *config);
void _pal_lld_setgroupmode(ioportid_t port,
ioportmask_t mask,
uint_fast8_t mode);
#ifdef __cplusplus
}
#endif
#endif /* _PAL_LLD_H_ */
/** @} */
|
