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
|
/* *****************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
*
* 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.
* ****************************************************************************/
/**
* @file timers.h
*
* @brief Timer prototypes and various definitions
*/
/* Note to self:
* The timer clock frequencies are automatically fixed by hardware.
* There are two cases:
* 1. if the APB prescaler is 1, the timer clock frequencies are
* set to the same frequency as that of the APB domain to which
* the timers are connected.
* 2. otherwise, they are set to twice (x2) the frequency of the
* APB domain to which the timers are connected.
* See stm32 manual, 77/995
*
* hence, 72 mhz timers
* */
/* Maple Timer channels:
* Timer Maple Pin STM32 Pin Type
* TIM1_CH1 D6 PA8 Advanced
* TIM1_CH2 D7 PA9 Advanced
* TIM1_CH3 D8 PA10 Advanced
*
* TIM2_CH1 D2 PA0
* TIM2_CH2 D3 PA1
* TIM2_CH3 D1 PA2
* TIM2_CH4 D0 PA3
*
* TIM3_CH1 D12 PA6
* TIM3_CH2 D11 PA7
* TIM3_CH3 EXT7 PB0
* TIM3_CH4 EXT8 PB1
*
* TIM4_CH1 EXT5 PB6
* TIM4_CH1 EXT9 PB7
* TIM4_CH1 EXT15 PB8
* TIM4_CH1 EXT4 PB9
*
* Not supported:
* TIM1_CH4 USBDM, not available PA11 Advanced
* TIM1_CH1_N EXT12 PB13
* TIM1_CH2_N EXT13 PB14
* TIM1_CH3_N EXT14 PB15
* */
/* I don't like the Arduino API for dealing with pin modes.
* How about...
*
* pinMode(digitalPin, PWM);
* pwmWrite(digitalPin) */
#ifndef _TIMERS_H_
#define _TIMERS_H_
#ifdef __cplusplus
extern "C"{
#endif
typedef volatile uint32* TimerCCR;
#define TIMER1_BASE 0x40012C00
#define TIMER2_BASE 0x40000000
#define TIMER3_BASE 0x40000400
#define TIMER4_BASE 0x40000800
#define ARPE BIT(7) // Auto-reload preload enable
#define NOT_A_TIMER 0
// just threw this in here cause I can, aw yeah
#define TIMER_CCR(NUM,CHAN) TIMER ## NUM ## _CH ## CHAN ## _CRR
#define TIMER1_CH1_CCR (TimerCCR)(TIMER1_BASE + 0x34)
#define TIMER1_CH2_CCR (TimerCCR)(TIMER1_BASE + 0x38)
#define TIMER1_CH3_CCR (TimerCCR)(TIMER1_BASE + 0x3C)
#define TIMER1_CH4_CCR (TimerCCR)(TIMER1_BASE + 0x40)
#define TIMER2_CH1_CCR (TimerCCR)(TIMER2_BASE + 0x34)
#define TIMER2_CH2_CCR (TimerCCR)(TIMER2_BASE + 0x38)
#define TIMER2_CH3_CCR (TimerCCR)(TIMER2_BASE + 0x3C)
#define TIMER2_CH4_CCR (TimerCCR)(TIMER2_BASE + 0x40)
#define TIMER3_CH1_CCR (TimerCCR)(TIMER3_BASE + 0x34)
#define TIMER3_CH2_CCR (TimerCCR)(TIMER3_BASE + 0x38)
#define TIMER3_CH3_CCR (TimerCCR)(TIMER3_BASE + 0x3C)
#define TIMER3_CH4_CCR (TimerCCR)(TIMER3_BASE + 0x40)
#define TIMER4_CH1_CCR (TimerCCR)(TIMER4_BASE + 0x34)
#define TIMER4_CH2_CCR (TimerCCR)(TIMER4_BASE + 0x38)
#define TIMER4_CH3_CCR (TimerCCR)(TIMER4_BASE + 0x3C)
#define TIMER4_CH4_CCR (TimerCCR)(TIMER4_BASE + 0x40)
#define TIMER_DISABLED 0
#define TIMER_PWM 1
#define TIMER_OUTPUTCOMPARE 2
/* Turn on timer with prescale as the divisor
* void timer_init(uint32 timer, uint16 prescale)
* timer -> {1-4}
* prescale -> {1-65535}
* */
void timer_init(uint8, uint16);
void timer_disable_all(void);
uint16 timer_get_count(uint8);
void timer_set_count(uint8,uint16);
void timer_pause(uint8);
void timer_resume(uint8);
void timer_set_prescaler(uint8 timer_num, uint16 prescale);
void timer_set_reload(uint8 timer_num, uint16 max_reload);
void timer_set_mode(uint8 timer_num, uint8 compare_num, uint8 mode);
void timer_set_compare_value(uint8 timer_num, uint8 compare_num, uint16 value);
void timer_attach_interrupt(uint8 timer_num, uint8 compare_num, voidFuncPtr handler);
void timer_detach_interrupt(uint8 timer_num, uint8 compare_num);
/* Turn on PWM with duty_cycle on the specified channel in timer.
* This function takes in a pointer to the corresponding CCR
* register for the pin cause it saves pwmWrite() a couple of
* cycles.
*
* void timer_pwm(uint8 channel, uint8 duty_cycle);
* channel -> {TIMERx_CHn_CCR}
* duty_cycle -> {0-65535}
*
* PRECONDITIONS:
* pin has been set to alternate function output
* timer has been initialized
*/
static inline void timer_pwm_write_ccr(TimerCCR CCR, uint16 duty_cycle) {
*CCR = duty_cycle;
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif
|
