ukkonooa and frequency slider

main/buzzer.c

@@ -0,0 +1,84 @@
+#include <math.h>
+#include <stdint.h>
+
+#include "driver/ledc.h"
+#include "esp_clk_tree.h"
+#include "esp_err.h"
+#include "esp_log.h"
+#include "freertos/FreeRTOS.h" // IWYU pragma: keep
+#include "freertos/task.h"
+#include "hal/ledc_types.h"
+#include "soc/clk_tree_defs.h"
+
+#include "buzzer.h"
+
+static const char* TAG = "BUZZER_C";
+
+const uint32_t init_buzzer_freq = 2731;
+
+void buzzer_init(const uint32_t frequency) {
+    uint32_t clk_freq = 0;
+    ESP_ERROR_CHECK(esp_clk_tree_src_get_freq_hz(
+        SOC_MOD_CLK_RC_FAST, ESP_CLK_TREE_SRC_FREQ_PRECISION_EXACT, &clk_freq));
+
+    uint32_t duty_resolution =
+        ledc_find_suitable_duty_resolution(clk_freq, frequency);
+    if (duty_resolution == 0) {
+        ESP_LOGE(TAG, "Could not determine optimal duty resolution.\n");
+        return;
+    }
+
+    ledc_timer_config_t ledc_config = {.speed_mode = LEDC_LOW_SPEED_MODE,
+                                       .timer_num = LEDC_TIMER_0,
+                                       .freq_hz = frequency,
+                                       .duty_resolution = duty_resolution,
+                                       .clk_cfg = LEDC_USE_RC_FAST_CLK};
+
+    ESP_ERROR_CHECK(ledc_timer_config(&ledc_config));
+
+    ledc_channel_config_t ledc_ch_config = {
+        .gpio_num = 9,
+        .speed_mode = LEDC_LOW_SPEED_MODE,
+        .channel = LEDC_CHANNEL_0,
+        .timer_sel = LEDC_TIMER_0,
+        .duty = (uint32_t)(pow(2, duty_resolution) / 2),
+        // .hpoint = ((uint32_t) pow(2, duty_resolution)) - 1,
+        .hpoint = 0,
+        .sleep_mode = LEDC_SLEEP_MODE_KEEP_ALIVE,
+        .flags.output_invert = false};
+
+    ESP_ERROR_CHECK(ledc_channel_config(&ledc_ch_config));
+}
+
+uint32_t modify_frequency(int amount) {
+    uint32_t freq = ledc_get_freq(LEDC_LOW_SPEED_MODE, LEDC_TIMER_0) + amount;
+    if (freq < 10) {
+        freq = 10;
+    }
+    buzzer_pause();
+    ESP_ERROR_CHECK(ledc_set_freq(LEDC_LOW_SPEED_MODE, LEDC_TIMER_0, freq));
+    buzzer_resume();
+    return freq;
+}
+
+uint32_t reset_frequency() {
+    ESP_ERROR_CHECK(
+        ledc_set_freq(LEDC_LOW_SPEED_MODE, LEDC_TIMER_0, init_buzzer_freq));
+    return init_buzzer_freq;
+}
+
+void set_frequency(const uint32_t freq) {
+    ESP_ERROR_CHECK(ledc_set_freq(LEDC_LOW_SPEED_MODE, LEDC_TIMER_0, freq));
+}
+
+void buzzer_pause() {
+    ESP_ERROR_CHECK(ledc_timer_pause(LEDC_LOW_SPEED_MODE, LEDC_TIMER_0));
+}
+
+void buzzer_reset() {
+    ESP_ERROR_CHECK(ledc_timer_rst(LEDC_LOW_SPEED_MODE, LEDC_TIMER_0));
+}
+
+void buzzer_resume() {
+    ESP_ERROR_CHECK(ledc_timer_resume(LEDC_LOW_SPEED_MODE, LEDC_TIMER_0));
+}