Support adjust volume with knob in SenseCAP Watcher (#399)

* fix typo, add missing prefix `CONFIG` to `ESP_TASK_WDT_TIMEOUT_S`

* add KNOB gpio spec to sensecap config

* create new knob component

* implement ajust output volume with knob

* modify function name to UpperCamelCase

* Tidy up comments and logs

main/boards/common/knob.cc

@@ -0,0 +1,52 @@
+#include "knob.h"
+
+static const char* TAG = "Knob";
+
+Knob::Knob(gpio_num_t pin_a, gpio_num_t pin_b) {
+    knob_config_t config = {
+        .default_direction = 0,
+        .gpio_encoder_a = static_cast<uint8_t>(pin_a),
+        .gpio_encoder_b = static_cast<uint8_t>(pin_b),
+    };
+
+    esp_err_t err = ESP_OK;
+    knob_handle_ = iot_knob_create(&config);
+    if (knob_handle_ == NULL) {
+        ESP_LOGE(TAG, "Failed to create knob instance");
+        return;
+    }
+
+    err = iot_knob_register_cb(knob_handle_, KNOB_LEFT, knob_callback, this);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to register left callback: %s", esp_err_to_name(err));
+        return;
+    }
+
+    err = iot_knob_register_cb(knob_handle_, KNOB_RIGHT, knob_callback, this);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to register right callback: %s", esp_err_to_name(err));
+        return;
+    }
+
+    ESP_LOGI(TAG, "Knob initialized with pins A:%d B:%d", pin_a, pin_b);
+}
+
+Knob::~Knob() {
+    if (knob_handle_ != NULL) {
+        iot_knob_delete(knob_handle_);
+        knob_handle_ = NULL;
+    }
+}
+
+void Knob::OnRotate(std::function<void(bool)> callback) {
+    on_rotate_ = callback;
+}
+
+void Knob::knob_callback(void* arg, void* data) {
+    Knob* knob = static_cast<Knob*>(data);
+    knob_event_t event = iot_knob_get_event(arg);
+    
+    if (knob->on_rotate_) {
+        knob->on_rotate_(event == KNOB_RIGHT);
+    }
+}

main/boards/common/knob.h

@@ -0,0 +1,25 @@
+#ifndef KNOB_H_
+#define KNOB_H_
+
+#include <driver/gpio.h>
+#include <functional>
+#include <esp_log.h>
+#include <iot_knob.h>
+
+class Knob {
+public:
+    Knob(gpio_num_t pin_a, gpio_num_t pin_b);
+    ~Knob();
+
+    void OnRotate(std::function<void(bool)> callback);
+
+private:
+    static void knob_callback(void* arg, void* data);
+
+    knob_handle_t knob_handle_;
+    gpio_num_t pin_a_;
+    gpio_num_t pin_b_;
+    std::function<void(bool)> on_rotate_;
+};
+
+#endif // KNOB_H_