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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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* CONFIG_2TIM_3CH :- configuration when 3 channels are configured using two timers
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* CONFIG_1TIM_2CH :- configuration when 2 channels are configured using one timer
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* CONFIG_1TIM_3CH :- configuration when 3 channels are configured using one timer
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*/
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#define CONFIG_1TIM_3CH
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/*
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* CONFIG_THREADSAFE_API :- configure using ledc_set_duty_and_update() function
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* CONFIG_NONTHREADSAFE_API :- configure using ledc_set_duty() and ledc_update_duty() functions
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*/
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#define CONFIG_NONTHREADSAFE_API
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/* TIMER and CHENNEL configurations */
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#define LEDC_TIMER0 LEDC_TIMER_0
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#define LEDC_TIMER1 LEDC_TIMER_1
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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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#define LEDC_HS_CH2_GPIO (21)
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#define LEDC_HS_CH2_CHANNEL LEDC_CHANNEL_2
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#define LEDC_TIMER_RESOLUTION LEDC_TIMER_10_BIT
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#define LEDC_TIMER_FREQ 1024
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#ifdef CONFIG_1TIM_2CH
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#define LEDC_TEST_CH_NUM (2)
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#else
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#define LEDC_TEST_CH_NUM (3)
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#endif
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#define LEDC_TEST_DUTY (1023)
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/* A digital signal is toggled to measure the sweep time */
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#define GPIO_OUTPUT_IO 5
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int gpio_level = 0;
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ledc_channel_config_t ledc_channel[LEDC_TEST_CH_NUM] = {
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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_TIMER0
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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_TIMER0
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},
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#ifndef CONFIG_1TIM_2CH
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{
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.channel = LEDC_HS_CH2_CHANNEL,
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.duty = 0,
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.gpio_num = LEDC_HS_CH2_GPIO,
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.speed_mode = LEDC_HS_MODE,
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.hpoint = 0,
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#ifdef CONFIG_2TIM_3CH
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.timer_sel = LEDC_TIMER1
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#else
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.timer_sel = LEDC_TIMER0
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#endif
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},
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#endif
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};
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void test_ledc_api (void *arg){
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int duty = 0;
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while (1) {
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if (gpio_level == 1)
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{
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gpio_level = 0;
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}
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else
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{
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gpio_level = 1;
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}
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gpio_set_level(GPIO_OUTPUT_IO, gpio_level);
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for (int ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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#ifdef CONFIG_THREADSAFE_API
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ledc_set_duty_and_update(ledc_channel[ch].speed_mode, ledc_channel[ch].channel, duty, 0);
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#else
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ledc_set_duty(ledc_channel[ch].speed_mode, ledc_channel[ch].channel, duty);
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ledc_update_duty(ledc_channel[ch].speed_mode, ledc_channel[ch].channel);
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#endif
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}
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duty = duty + 1;
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if (duty == 1024)
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{
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duty = 0;
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}
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}
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}
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void config_gpio(){
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gpio_pad_select_gpio(GPIO_OUTPUT_IO);
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gpio_set_direction(GPIO_OUTPUT_IO, GPIO_MODE_OUTPUT);
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gpio_set_drive_capability(GPIO_OUTPUT_IO, GPIO_DRIVE_CAP_2);
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}
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void app_main(void)
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{
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ledc_timer_config_t ledc_timer0 = {
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.duty_resolution = LEDC_TIMER_RESOLUTION, // resolution of PWM duty
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.freq_hz = LEDC_TIMER_FREQ, // frequency of PWM signal
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.speed_mode = LEDC_HS_MODE, // timer mode
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.timer_num = LEDC_TIMER0, // timer index
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.clk_cfg = LEDC_AUTO_CLK, // Auto select the source clock
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};
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ledc_timer_config(&ledc_timer0);
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#ifdef CONFIG_2TIM_3CH
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ledc_timer_config_t ledc_timer1 = {
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.duty_resolution = LEDC_TIMER_RESOLUTION, // resolution of PWM duty
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.freq_hz = 1024, // frequency of PWM signal
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.speed_mode = LEDC_HS_MODE, // timer mode
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.timer_num = LEDC_TIMER1, // timer index
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.clk_cfg = LEDC_AUTO_CLK, // Auto select the source clock
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};
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ledc_timer_config(&ledc_timer1);
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#endif
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for (int 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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ledc_fade_func_install(0);
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config_gpio();
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xTaskCreate(test_ledc_api, "ledcapi", 4096, NULL, tskIDLE_PRIORITY, NULL);
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}
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