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
|
/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Bryan Newbold.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*****************************************************************************/
#include <wirish/HardwareTimer.h>
#include <wirish/boards.h> // for CYCLES_PER_MICROSECOND
#include <wirish/wirish_math.h>
// TODO [0.1.0] Remove deprecated pieces
#define MAX_RELOAD ((1 << 16) - 1)
/*
* Big ugly table of timers available on the MCU. Needed by the
* HardwareTimer constructor. Sigh; maybe predefined instances weren't
* such a bad idea. Oh well, at least the HardwareTimer interface is
* officially unstable since v0.0.12; we can always get rid of this
* later.
*/
#define MAX_NR_TIMERS 17 // No STM32 I've ever heard of has higher than TIMER17
static timer_dev *devs[MAX_NR_TIMERS] = {
#if STM32_HAVE_TIMER(1)
TIMER1,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(2)
TIMER2,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(3)
TIMER3,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(4)
TIMER4,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(5)
TIMER5,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(6)
TIMER6,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(7)
TIMER7,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(8)
TIMER8,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(9)
TIMER9,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(10)
TIMER10,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(11)
TIMER11,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(12)
TIMER12,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(13)
TIMER13,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(14)
TIMER14,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(15)
TIMER15,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(16)
TIMER16,
#else
NULL,
#endif
#if STM32_HAVE_TIMER(17)
TIMER17,
#else
NULL,
#endif
};
/*
* HardwareTimer routines
*/
HardwareTimer::HardwareTimer(uint8 timerNum) {
ASSERT(timerNum <= MAX_NR_TIMERS);
this->dev = devs[timerNum - 1];
ASSERT(this->dev != NULL);
}
void HardwareTimer::pause(void) {
timer_pause(this->dev);
}
void HardwareTimer::resume(void) {
timer_resume(this->dev);
}
uint32 HardwareTimer::getPrescaleFactor(void) {
return timer_get_prescaler(this->dev) + 1;
}
void HardwareTimer::setPrescaleFactor(uint32 factor) {
timer_set_prescaler(this->dev, (uint16)(factor - 1));
}
uint16 HardwareTimer::getOverflow() {
return timer_get_reload(this->dev);
}
void HardwareTimer::setOverflow(uint16 val) {
timer_set_reload(this->dev, val);
}
uint16 HardwareTimer::getCount(void) {
return timer_get_count(this->dev);
}
void HardwareTimer::setCount(uint16 val) {
uint16 ovf = this->getOverflow();
timer_set_count(this->dev, min(val, ovf));
}
uint16 HardwareTimer::setPeriod(uint32 microseconds) {
// Not the best way to handle this edge case?
if (!microseconds) {
this->setPrescaleFactor(1);
this->setOverflow(1);
return this->getOverflow();
}
uint32 period_cyc = microseconds * CYCLES_PER_MICROSECOND;
uint16 prescaler = (uint16)(period_cyc / MAX_RELOAD + 1);
uint16 overflow = (uint16)round(period_cyc / prescaler);
this->setPrescaleFactor(prescaler);
this->setOverflow(overflow);
return overflow;
}
void HardwareTimer::setMode(int channel, timer_mode mode) {
timer_set_mode(this->dev, (uint8)channel, (timer_mode)mode);
}
uint16 HardwareTimer::getCompare(int channel) {
return timer_get_compare(this->dev, (uint8)channel);
}
void HardwareTimer::setCompare(int channel, uint16 val) {
uint16 ovf = this->getOverflow();
timer_set_compare(this->dev, (uint8)channel, min(val, ovf));
}
void HardwareTimer::attachInterrupt(int channel, voidFuncPtr handler) {
timer_attach_interrupt(this->dev, (uint8)channel, handler);
}
void HardwareTimer::detachInterrupt(int channel) {
timer_detach_interrupt(this->dev, (uint8)channel);
}
void HardwareTimer::refresh(void) {
timer_generate_update(this->dev);
}
/* -- Deprecated predefined instances -------------------------------------- */
HardwareTimer Timer1(1);
HardwareTimer Timer2(2);
HardwareTimer Timer3(3);
HardwareTimer Timer4(4);
#ifdef STM32_HIGH_DENSITY
HardwareTimer Timer5(5);
HardwareTimer Timer6(6);
HardwareTimer Timer7(7);
HardwareTimer Timer8(8);
#endif
|
