forked from danjperron/rpi_ws281x
-
Notifications
You must be signed in to change notification settings - Fork 0
/
pwm.c
104 lines (91 loc) · 2.79 KB
/
pwm.c
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
/*
* pwm.c
*
* Copyright (c) 2014 Jeremy Garff <jer @ jers.net>
*
* All rights reserved.
*
* 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 of the owner 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 HOLDER 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.
*
*/
#include <stdint.h>
#include "ws2811.h"
#include "pwm.h"
// Mapping of Pin to alternate function for PWM channel 0
const pwm_pin_table_t pwm_pin_chan0[] =
{
{
.pinnum = 12,
.altnum = 0,
},
{
.pinnum = 18,
.altnum = 5,
},
{
.pinnum = 40,
.altnum = 0,
},
};
// Mapping of Pin to alternate function for PWM channel 1
const pwm_pin_table_t pwm_pin_chan1[] =
{
{
.pinnum = 13,
.altnum = 0,
},
{
.pinnum = 19,
.altnum = 5,
},
{
.pinnum = 41,
.altnum = 0,
},
{
.pinnum = 45,
.altnum = 0,
},
};
const pwm_pin_tables_t pwm_pin_tables[RPI_PWM_CHANNELS] =
{
{
.pins = pwm_pin_chan0,
.count = sizeof(pwm_pin_chan0) / sizeof(pwm_pin_chan0[0]),
},
{
.pins = pwm_pin_chan1,
.count = sizeof(pwm_pin_chan1) / sizeof(pwm_pin_chan1[0]),
},
};
int pwm_pin_alt(int chan, int pinnum)
{
const pwm_pin_tables_t *pintable = &pwm_pin_tables[chan];
int i;
for (i = 0; i < pintable->count; i++)
{
if (pintable->pins[i].pinnum == pinnum)
{
return pintable->pins[i].altnum;
}
}
return -1;
}