72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
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/* LEDC (LED Controller) basic 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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// esp-idf includes
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#include <esp_log.h>
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#include "driver/ledc.h"
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#include "esp_err.h"
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#include "buzzer.h"
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namespace buzzer
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{
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constexpr const char TAG[] = "BUZZER";
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#define LEDC_TIMER LEDC_TIMER_0
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#define LEDC_MODE LEDC_LOW_SPEED_MODE
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#define LEDC_OUTPUT_IO (0) // Define the output GPIO
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#define LEDC_CHANNEL LEDC_CHANNEL_0
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#define LEDC_DUTY_RES LEDC_TIMER_13_BIT // Set duty resolution to 13 bits
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#define LEDC_DUTY (4095) // Set duty to 50%. ((2 ** 13) - 1) * 50% = 4095
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#define LEDC_FREQUENCY (4000) // Frequency in Hertz. Set frequency at 4 kHz
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void init()
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{
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// Prepare and then apply the LEDC PWM timer configuration
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ledc_timer_config_t ledc_timer = {
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.speed_mode = LEDC_MODE,
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.duty_resolution = LEDC_DUTY_RES,
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.timer_num = LEDC_TIMER,
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.freq_hz = LEDC_FREQUENCY, // Set output frequency at 4 kHz
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.clk_cfg = LEDC_AUTO_CLK
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};
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if (auto result = ledc_timer_config(&ledc_timer) != ESP_OK) {
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ESP_LOGW(TAG, "ledc_timer_config() failed with %s", esp_err_to_name(result));
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return;
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}
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// Prepare and then apply the LEDC PWM channel configuration
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ledc_channel_config_t ledc_channel = {
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.gpio_num = LEDC_OUTPUT_IO,
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.speed_mode = LEDC_MODE,
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.channel = LEDC_CHANNEL,
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.intr_type = LEDC_INTR_DISABLE,
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.timer_sel = LEDC_TIMER,
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.duty = 0, // Set duty to 0%
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.hpoint = 0
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};
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if (auto result = ledc_channel_config(&ledc_channel) != ESP_OK) {
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ESP_LOGW(TAG, "ledc_channel_config() failed with %s", esp_err_to_name(result));
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return;
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}
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}
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void set_frequency(int frequency)
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{
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if (frequency != 0)
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{
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ledc_set_freq(LEDC_MODE, LEDC_TIMER, frequency);
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ledc_set_duty(LEDC_MODE, LEDC_CHANNEL, LEDC_DUTY);
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ledc_update_duty(LEDC_MODE, LEDC_CHANNEL);
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}
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else
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{
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ledc_set_duty(LEDC_MODE, LEDC_CHANNEL, 0);
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ledc_update_duty(LEDC_MODE, LEDC_CHANNEL);
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}
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}
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}
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