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49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_log.h"
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#include "driver/sdm.h"
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#define EXAMPLE_SIGMA_DELTA_GPIO_NUM 0
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#define EXAMPLE_LED_DIM_PERIOD_MS 1000
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#define EXAMPLE_LED_DIM_DELAY_MS 10
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#define EXAMPLE_LED_DIM_DUTY_STEP 2
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#define EXAMPLE_LED_DIM_DUTY_MAX 90
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#define EXAMPLE_LED_DIM_DUTY_MIN (EXAMPLE_LED_DIM_DUTY_MAX - EXAMPLE_LED_DIM_PERIOD_MS / EXAMPLE_LED_DIM_DELAY_MS * EXAMPLE_LED_DIM_DUTY_STEP)
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static const char *TAG = "example";
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void app_main(void)
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{
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ESP_LOGI(TAG, "Install sigma delta channel");
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sdm_channel_handle_t sdm_chan = NULL;
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sdm_config_t config = {
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.clk_src = SDM_CLK_SRC_DEFAULT,
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.gpio_num = EXAMPLE_SIGMA_DELTA_GPIO_NUM,
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.sample_rate_hz = 1 * 1000 * 1000, // 1MHz sample rate
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};
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ESP_ERROR_CHECK(sdm_new_channel(&config, &sdm_chan));
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ESP_LOGI(TAG, "Enable sigma delta channel");
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ESP_ERROR_CHECK(sdm_channel_enable(sdm_chan));
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ESP_LOGI(TAG, "Change duty cycle continuously");
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int8_t duty = 0;
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int step = EXAMPLE_LED_DIM_DUTY_STEP;
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while (1) {
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ESP_ERROR_CHECK(sdm_channel_set_duty(sdm_chan, duty));
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/* By changing delay time, you can change the blink frequency of LED */
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vTaskDelay(pdMS_TO_TICKS(EXAMPLE_LED_DIM_DELAY_MS));
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duty += step;
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if (duty == EXAMPLE_LED_DIM_DUTY_MAX || duty == EXAMPLE_LED_DIM_DUTY_MIN) {
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step *= -1;
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}
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}
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}
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