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
246
247
248
249
250
251
252
253
254
255
|
/****************************************************************************
* configs/open1788/src/lpc17_buttons.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <arch/board/board.h>
#include "lpc17_gpio.h"
#include "open1788.h"
#ifdef CONFIG_ARCH_BUTTONS
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* The Open1788 supports several buttons. All will read "1" when open and "0"
* when closed
*
* USER1 -- Connected to P4[26]
* USER2 -- Connected to P2[22]
* USER3 -- Connected to P0[10]
*
* And a Joystick
*
* JOY_A -- Connected to P2[25]
* JOY_B -- Connected to P2[26]
* JOY_C -- Connected to P2[23]
* JOY_D -- Connected to P2[19]
* JOY_CTR -- Connected to P0[14]
*
* The switches are all connected to ground and should be pulled up and sensed
* with a value of '0' when closed.
*/
/* Pin configuration for each Open1788 button. This array is indexed by
* the BUTTON_* and JOYSTICK_* definitions in board.h
*/
static const lpc17_pinset_t g_buttoncfg[BOARD_NUM_BUTTONS] =
{
GPIO_USER1, GPIO_USER2, GPIO_USER3, GPIO_JOY_A,
GPIO_JOY_B, GPIO_JOY_C, GPIO_JOY_D, GPIO_JOY_CTR
};
/* This array defines all of the interupt handlers current attached to
* button events.
*/
#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_GPIO_IRQ)
static xcpt_t g_buttonisr[BOARD_NUM_BUTTONS];
/* This array provides the mapping from button ID numbers to button IRQ
* numbers.
*/
static uint8_t g_buttonirq[BOARD_NUM_BUTTONS] =
{
0, GPIO_USER2_IRQ, GPIO_USER3_IRQ, GPIO_JOY_A_IRQ,
GPIO_JOY_B_IRQ, GPIO_JOY_C_IRQ, GPIO_JOY_D_IRQ, GPIO_JOY_CTR_IRQ
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: board_button_initialize
*
* Description:
* board_button_initialize() must be called to initialize button resources. After
* that, board_buttons() may be called to collect the current state of all
* buttons or up_irqbutton() may be called to register button interrupt
* handlers.
*
****************************************************************************/
void board_button_initialize(void)
{
int i;
/* Configure the GPIO pins as interrupting inputs. */
for (i = 0; i < BOARD_NUM_BUTTONS; i++)
{
lpc17_configgpio(g_buttoncfg[i]);
}
}
/****************************************************************************
* Name: board_buttons
*
* Description:
* board_button_initialize() must be called to initialize button resources. After
* that, board_buttons() may be called to collect the current state of all
* buttons.
*
* board_buttons() may be called at any time to harvest the state of every
* button. The state of the buttons is returned as a bitset with one
* bit corresponding to each button: If the bit is set, then the button
* is pressed. See the BOARD_BUTTON_*_BIT and BOARD_JOYSTICK_*_BIT
* definitions in board.h for the meaning of each bit.
*
****************************************************************************/
uint8_t board_buttons(void)
{
uint8_t ret = 0;
int i;
/* Check that state of each key */
for (i = 0; i < BOARD_NUM_BUTTONS; i++)
{
/* A LOW value means that the key is pressed. */
bool released = lpc17_gpioread(g_buttoncfg[i]);
/* Accumulate the set of depressed (not released) keys */
if (!released)
{
ret |= (1 << i);
}
}
return ret;
}
/****************************************************************************
* Button support.
*
* Description:
* board_button_initialize() must be called to initialize button resources. After
* that, up_irqbutton() may be called to register button interrupt handlers.
*
* up_irqbutton() may be called to register an interrupt handler that will
* be called when a button is depressed or released. The ID value is a
* button enumeration value that uniquely identifies a button resource. See the
* BOARD_BUTTON_* and BOARD_JOYSTICK_* definitions in board.h for the meaning
* of enumeration values. The previous interrupt handler address is returned
* (so that it may restored, if so desired).
*
* Note that up_irqbutton() also enables button interrupts. Button
* interrupts will remain enabled after the interrupt handler is attached.
* Interrupts may be disabled (and detached) by calling up_irqbutton with
* irqhandler equal to NULL.
*
****************************************************************************/
#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_GPIO_IRQ)
xcpt_t up_irqbutton(int id, xcpt_t irqhandler)
{
xcpt_t oldhandler = NULL;
irqstate_t flags;
int irq;
/* Verify that the button ID is within range */
if ((unsigned)id < BOARD_NUM_BUTTONS)
{
/* Get the IRQ number for the button; A value of zero indicates that
* the button does not support the interrupt function.
*/
irq = g_buttonirq[id];
if (irq > 0)
{
/* Disable interrupts until we are done */
flags = irqsave();
/* Return the current button handler and set the new interrupt handler */
oldhandler = g_buttonisr[id];
g_buttonisr[id] = irqhandler;
/* Configure the interrupt. Either attach and enable the new
* interrupt or disable and detach the old interrupt handler.
*/
if (irqhandler)
{
/* Attach then enable the new interrupt handler */
(void)irq_attach(irq, irqhandler);
up_enable_irq(irq);
}
else
{
/* Disable then detach the old interrupt handler */
up_disable_irq(irq);
(void)irq_detach(irq);
}
irqrestore(flags);
}
}
return oldhandler;
}
#endif
#endif /* CONFIG_ARCH_BUTTONS */
|
