Line data Source code
1 0 : /*
2 : * Copyright (c) 2019 Vestas Wind Systems A/S
3 : *
4 : * SPDX-License-Identifier: Apache-2.0
5 : */
6 : #ifndef ZEPHYR_INCLUDE_DT_BINDINGS_PWM_PWM_H_
7 : #define ZEPHYR_INCLUDE_DT_BINDINGS_PWM_PWM_H_
8 :
9 : /**
10 : * @addtogroup pwm_interface
11 : * @{
12 : */
13 :
14 : /**
15 : * @name PWM period set helpers
16 : * The period cell in the PWM specifier needs to be provided in nanoseconds.
17 : * However, in some applications it is more convenient to use another scale.
18 : * @{
19 : */
20 :
21 : /** Specify PWM period in nanoseconds */
22 1 : #define PWM_NSEC(x) (x)
23 : /** Specify PWM period in microseconds */
24 1 : #define PWM_USEC(x) (PWM_NSEC(x) * 1000UL)
25 : /** Specify PWM period in milliseconds */
26 1 : #define PWM_MSEC(x) (PWM_USEC(x) * 1000UL)
27 : /** Specify PWM period in seconds */
28 1 : #define PWM_SEC(x) (PWM_MSEC(x) * 1000UL)
29 : /** Specify PWM frequency in hertz */
30 1 : #define PWM_HZ(x) (PWM_SEC(1UL) / (x))
31 : /** Specify PWM frequency in kilohertz */
32 1 : #define PWM_KHZ(x) (PWM_HZ((x) * 1000UL))
33 :
34 : /** @} */
35 :
36 : /**
37 : * @name PWM polarity flags
38 : * The `PWM_POLARITY_*` flags are used with pwm_set_cycles(), pwm_set()
39 : * or pwm_configure_capture() to specify the polarity of a PWM channel.
40 : *
41 : * The flags are on the lower 8bits of the pwm_flags_t
42 : * @{
43 : */
44 : /** PWM pin normal polarity (active-high pulse). */
45 1 : #define PWM_POLARITY_NORMAL (0 << 0)
46 :
47 : /** PWM pin inverted polarity (active-low pulse). */
48 1 : #define PWM_POLARITY_INVERTED (1 << 0)
49 :
50 : /** @cond INTERNAL_HIDDEN */
51 : #define PWM_POLARITY_MASK 0x1
52 : /** @endcond */
53 : /** @} */
54 :
55 : /** @} */
56 :
57 : #endif /* ZEPHYR_INCLUDE_DT_BINDINGS_PWM_PWM_H_ */
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