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
|
/******************************************************************************
* 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 "HardwareTimer.h"
#include "boards.h" // for CYCLES_PER_MICROSECOND
#include "wirish_math.h"
// TODO [0.1.0] Remove deprecated pieces
#ifdef STM32_MEDIUM_DENSITY
#define NR_TIMERS 4
#elif defined(STM32_HIGH_DENSITY)
#define NR_TIMERS 8
#else
#error "Unsupported density"
#endif
#define MAX_RELOAD ((1 << 16) - 1)
HardwareTimer::HardwareTimer(uint8 timerNum) {
if (timerNum > NR_TIMERS) {
ASSERT(0);
}
timer_dev *devs[] = {
TIMER1,
TIMER2,
TIMER3,
TIMER4,
#ifdef STM32_HIGH_DENSITY
TIMER5,
TIMER6,
TIMER7,
TIMER8,
#endif
};
this->dev = devs[timerNum - 1];
}
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);
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
|
