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199 lines
6.9 KiB
C
199 lines
6.9 KiB
C
/* LEDC (LED Controller) fade example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "driver/ledc.h"
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#include "esp_err.h"
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/*
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* About this example
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*
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* 1. Start with initializing LEDC module:
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* a. Set the timer of LEDC first, this determines the frequency
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* and resolution of PWM.
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* b. Then set the LEDC channel you want to use,
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* and bind with one of the timers.
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*
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* 2. You need first to install a default fade function,
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* then you can use fade APIs.
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*
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* 3. You can also set a target duty directly without fading.
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*
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* 4. This example uses GPIO18/19/4/5 as LEDC output,
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* and it will change the duty repeatedly.
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*
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* 5. GPIO18/19 are from high speed channel group.
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* GPIO4/5 are from low speed channel group.
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*
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*/
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#if CONFIG_IDF_TARGET_ESP32
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#define LEDC_HS_TIMER LEDC_TIMER_0
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#define LEDC_HS_MODE LEDC_HIGH_SPEED_MODE
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#define LEDC_HS_CH0_GPIO (18)
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#define LEDC_HS_CH0_CHANNEL LEDC_CHANNEL_0
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#define LEDC_HS_CH1_GPIO (19)
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#define LEDC_HS_CH1_CHANNEL LEDC_CHANNEL_1
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#endif
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#define LEDC_LS_TIMER LEDC_TIMER_1
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#define LEDC_LS_MODE LEDC_LOW_SPEED_MODE
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#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32C3
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#define LEDC_LS_CH0_GPIO (18)
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#define LEDC_LS_CH0_CHANNEL LEDC_CHANNEL_0
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#define LEDC_LS_CH1_GPIO (19)
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#define LEDC_LS_CH1_CHANNEL LEDC_CHANNEL_1
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#endif
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#define LEDC_LS_CH2_GPIO (4)
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#define LEDC_LS_CH2_CHANNEL LEDC_CHANNEL_2
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#define LEDC_LS_CH3_GPIO (5)
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#define LEDC_LS_CH3_CHANNEL LEDC_CHANNEL_3
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#define LEDC_TEST_CH_NUM (4)
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#define LEDC_TEST_DUTY (4000)
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#define LEDC_TEST_FADE_TIME (3000)
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void app_main(void)
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{
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int ch;
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/*
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* Prepare and set configuration of timers
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* that will be used by LED Controller
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*/
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ledc_timer_config_t ledc_timer = {
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.duty_resolution = LEDC_TIMER_13_BIT, // resolution of PWM duty
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.freq_hz = 5000, // frequency of PWM signal
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.speed_mode = LEDC_LS_MODE, // timer mode
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.timer_num = LEDC_LS_TIMER, // timer index
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.clk_cfg = LEDC_AUTO_CLK, // Auto select the source clock
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};
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// Set configuration of timer0 for high speed channels
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ledc_timer_config(&ledc_timer);
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#ifdef CONFIG_IDF_TARGET_ESP32
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// Prepare and set configuration of timer1 for low speed channels
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ledc_timer.speed_mode = LEDC_HS_MODE;
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ledc_timer.timer_num = LEDC_HS_TIMER;
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ledc_timer_config(&ledc_timer);
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#endif
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/*
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* Prepare individual configuration
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* for each channel of LED Controller
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* by selecting:
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* - controller's channel number
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* - output duty cycle, set initially to 0
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* - GPIO number where LED is connected to
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* - speed mode, either high or low
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* - timer servicing selected channel
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* Note: if different channels use one timer,
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* then frequency and bit_num of these channels
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* will be the same
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*/
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ledc_channel_config_t ledc_channel[LEDC_TEST_CH_NUM] = {
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#if CONFIG_IDF_TARGET_ESP32
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{
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.channel = LEDC_HS_CH0_CHANNEL,
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.duty = 0,
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.gpio_num = LEDC_HS_CH0_GPIO,
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.speed_mode = LEDC_HS_MODE,
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.hpoint = 0,
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.timer_sel = LEDC_HS_TIMER,
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.flags.output_invert = 0
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},
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{
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.channel = LEDC_HS_CH1_CHANNEL,
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.duty = 0,
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.gpio_num = LEDC_HS_CH1_GPIO,
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.speed_mode = LEDC_HS_MODE,
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.hpoint = 0,
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.timer_sel = LEDC_HS_TIMER,
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.flags.output_invert = 0
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},
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#elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32C3
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{
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.channel = LEDC_LS_CH0_CHANNEL,
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.duty = 0,
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.gpio_num = LEDC_LS_CH0_GPIO,
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.speed_mode = LEDC_LS_MODE,
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.hpoint = 0,
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.timer_sel = LEDC_LS_TIMER,
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.flags.output_invert = 0
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},
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{
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.channel = LEDC_LS_CH1_CHANNEL,
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.duty = 0,
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.gpio_num = LEDC_LS_CH1_GPIO,
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.speed_mode = LEDC_LS_MODE,
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.hpoint = 0,
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.timer_sel = LEDC_LS_TIMER,
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.flags.output_invert = 0
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},
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#endif
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{
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.channel = LEDC_LS_CH2_CHANNEL,
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.duty = 0,
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.gpio_num = LEDC_LS_CH2_GPIO,
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.speed_mode = LEDC_LS_MODE,
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.hpoint = 0,
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.timer_sel = LEDC_LS_TIMER,
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.flags.output_invert = 1
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},
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{
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.channel = LEDC_LS_CH3_CHANNEL,
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.duty = 0,
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.gpio_num = LEDC_LS_CH3_GPIO,
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.speed_mode = LEDC_LS_MODE,
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.hpoint = 0,
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.timer_sel = LEDC_LS_TIMER,
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.flags.output_invert = 1
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},
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};
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// Set LED Controller with previously prepared configuration
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_channel_config(&ledc_channel[ch]);
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}
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// Initialize fade service.
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ledc_fade_func_install(0);
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while (1) {
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printf("1. LEDC fade up to duty = %d\n", LEDC_TEST_DUTY);
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_set_fade_with_time(ledc_channel[ch].speed_mode,
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ledc_channel[ch].channel, LEDC_TEST_DUTY, LEDC_TEST_FADE_TIME);
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ledc_fade_start(ledc_channel[ch].speed_mode,
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ledc_channel[ch].channel, LEDC_FADE_NO_WAIT);
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}
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vTaskDelay(LEDC_TEST_FADE_TIME / portTICK_PERIOD_MS);
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printf("2. LEDC fade down to duty = 0\n");
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_set_fade_with_time(ledc_channel[ch].speed_mode,
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ledc_channel[ch].channel, 0, LEDC_TEST_FADE_TIME);
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ledc_fade_start(ledc_channel[ch].speed_mode,
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ledc_channel[ch].channel, LEDC_FADE_NO_WAIT);
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}
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vTaskDelay(LEDC_TEST_FADE_TIME / portTICK_PERIOD_MS);
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printf("3. LEDC set duty = %d without fade\n", LEDC_TEST_DUTY);
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_set_duty(ledc_channel[ch].speed_mode, ledc_channel[ch].channel, LEDC_TEST_DUTY);
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ledc_update_duty(ledc_channel[ch].speed_mode, ledc_channel[ch].channel);
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}
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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printf("4. LEDC set duty = 0 without fade\n");
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_set_duty(ledc_channel[ch].speed_mode, ledc_channel[ch].channel, 0);
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ledc_update_duty(ledc_channel[ch].speed_mode, ledc_channel[ch].channel);
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}
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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}
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}
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