1 /*
2 * esp32 / esp-idf pwm
3 *
4 * Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25 #include "private-lib-core.h"
26 #include "soc/ledc_reg.h"
27 #include "driver/ledc.h"
28
29 #define _LEDC_HIGH_SPEED_MODE 0
30
31 static const ledc_timer_config_t tc = {
32 .speed_mode = _LEDC_HIGH_SPEED_MODE,
33 .duty_resolution = LEDC_TIMER_13_BIT,
34 .timer_num = LEDC_TIMER_0,
35 .freq_hz = 5000,
36 .clk_cfg = LEDC_AUTO_CLK
37 };
38
39 int
lws_pwm_plat_init(const struct lws_pwm_ops * lo)40 lws_pwm_plat_init(const struct lws_pwm_ops *lo)
41 {
42 ledc_channel_config_t lc = {
43 .duty = 8191,
44 .intr_type = LEDC_INTR_FADE_END,
45 .speed_mode = _LEDC_HIGH_SPEED_MODE,
46 .timer_sel = LEDC_TIMER_0,
47 };
48 size_t n;
49
50 ledc_timer_config(&tc);
51
52 for (n = 0; n < lo->count_pwm_map; n++) {
53 lc.channel = LEDC_CHANNEL_0 + lo->pwm_map[n].index;
54 lc.gpio_num = lo->pwm_map[n].gpio;
55 ledc_channel_config(&lc);
56 ledc_set_duty(_LEDC_HIGH_SPEED_MODE, lc.channel, 0);
57 ledc_update_duty(_LEDC_HIGH_SPEED_MODE, lc.channel);
58 }
59
60 return 0;
61 }
62
63 void
lws_pwm_plat_intensity(const struct lws_pwm_ops * lo,_lws_plat_gpio_t gpio,lws_led_intensity_t inten)64 lws_pwm_plat_intensity(const struct lws_pwm_ops *lo, _lws_plat_gpio_t gpio,
65 lws_led_intensity_t inten)
66 {
67 size_t n;
68
69 for (n = 0; n < lo->count_pwm_map; n++) {
70 if (lo->pwm_map[n].gpio == gpio) {
71 if (!lo->pwm_map[n].active_level)
72 inten = 65535 - inten;
73 ledc_set_duty(_LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0 +
74 lo->pwm_map[n].index, inten >> 3);
75 ledc_update_duty(_LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0 +
76 lo->pwm_map[n].index);
77 return;
78 }
79 }
80
81 lwsl_err("%s: unknown gpio for pwm\n", __func__);
82 }
83