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
|
/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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/ext_lld.c
* @brief AT91SAM7 EXT subsystem low level driver source.
*
* @addtogroup EXT
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_EXT || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief EXTDA driver identifier.
*/
EXTDriver EXTDA;
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512) || (SAM7_PLATFORM == SAM7A3)
/**
* @brief EXTDB driver identifier.
*/
EXTDriver EXTDB;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Handles external interrupts.
*
* @param[in] extp pointer to the driver that received the interrupt
*/
static void ext_lld_serveInterrupt(EXTDriver *extp) {
uint32_t irqFlags;
uint32_t ch;
chSysLockFromIsr();
/* Read flags of pending PIO interrupts.*/
irqFlags = extp->pio->PIO_ISR;
/* Call callback function for any pending interrupt.*/
for(ch = 0; ch < EXT_MAX_CHANNELS; ch++) {
/* Check if the channel is activated and if its IRQ flag is set.*/
if((extp->config->channels[ch].mode &
EXT_CH_MODE_ENABLED & EXT_CH_MODE_EDGES_MASK)
&& ((1 << ch) & irqFlags)) {
(extp->config->channels[ch].cb)(extp, ch);
}
}
chSysUnlockFromIsr();
AT91C_BASE_AIC->AIC_EOICR = 0;
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/**
* @brief EXTI[0] interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(EXTIA_IRQHandler) {
CH_IRQ_PROLOGUE();
ext_lld_serveInterrupt(&EXTDA);
CH_IRQ_EPILOGUE();
}
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512) || (SAM7_PLATFORM == SAM7A3)
/**
* @brief EXTI[1] interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(EXTIB_IRQHandler) {
CH_IRQ_PROLOGUE();
ext_lld_serveInterrupt(&EXTDB);
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level EXT driver initialization.
*
* @notapi
*/
void ext_lld_init(void) {
/* Driver initialization.*/
extObjectInit(&EXTDA);
/* Set PIO base addresses.*/
EXTDA.pio = AT91C_BASE_PIOA;
/* Set peripheral IDs.*/
EXTDA.pid = AT91C_ID_PIOA;
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512) || (SAM7_PLATFORM == SAM7A3)
/* Same for PIOB.*/
extObjectInit(&EXTDB);
EXTDB.pio = AT91C_BASE_PIOB;
EXTDB.pid = AT91C_ID_PIOB;
#endif
}
/**
* @brief Configures and activates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @notapi
*/
void ext_lld_start(EXTDriver *extp) {
uint16_t ch;
uint32_t ier = 0;
const EXTConfig *config = extp->config;
switch(extp->pid) {
case AT91C_ID_PIOA:
AIC_ConfigureIT(AT91C_ID_PIOA, SAM7_computeSMR(config->mode,
config->priority),
EXTIA_IRQHandler);
break;
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512) || (SAM7_PLATFORM == SAM7A3)
case AT91C_ID_PIOB:
AIC_ConfigureIT(AT91C_ID_PIOB, SAM7_computeSMR(config->mode,
config->priority),
EXTIB_IRQHandler);
break;
#endif
}
/* Enable and Disable channels with respect to config.*/
for(ch = 0; ch < EXT_MAX_CHANNELS; ch++) {
ier |= (config->channels[ch].mode & EXT_CH_MODE_EDGES_MASK & EXT_CH_MODE_ENABLED ? 1 : 0) << ch;
}
extp->pio->PIO_IER = ier;
extp->pio->PIO_IDR = ~ier;
/* Enable interrupt on corresponding PIO port in AIC.*/
AIC_EnableIT(extp->pid);
}
/**
* @brief Deactivates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @notapi
*/
void ext_lld_stop(EXTDriver *extp) {
/* Disable interrupt on corresponding PIO port in AIC.*/
AIC_DisableIT(extp->pid);
}
/**
* @brief Enables an EXT channel.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be enabled
*
* @notapi
*/
void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel) {
chDbgCheck((extp->config->channels[channel].cb != NULL),
"Call back pointer can not be NULL");
extp->pio->PIO_IER = (1 << channel);
}
/**
* @brief Disables an EXT channel.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be disabled
*
* @notapi
*/
void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel) {
extp->pio->PIO_IDR = (1 << channel);
}
#endif /* HAL_USE_EXT */
/** @} */
|
