esp32 time benchmark

api:
  services:
    - service: run_timer_benchmark
      then:
        - lambda: |-
            ESP_LOGI("benchmark", "Running timer benchmark...");

            const int iterations = 100000;
            volatile uint32_t dummy = 0;

            struct Timer {
              uint32_t cached_value;
              uint32_t get() const { return cached_value; }
            } timer;

            // Warm-up
            timer.cached_value = millis();
            dummy = timer.get();
            dummy = millis();

            // millis() timing
            int64_t start = micros();
            for (int i = 0; i < iterations; ++i) {
              dummy = millis();
            }
            int64_t end = micros();
            double millis_us = (end - start) / static_cast<double>(iterations);

            // Cached member access timing
            timer.cached_value = 123456789;
            start = micros();
            for (int i = 0; i < iterations; ++i) {
              dummy = timer.get();
            }
            end = micros();
            double cached_us = (end - start) / static_cast<double>(iterations);

            ESP_LOGI("benchmark", "millis():                   %.3f µs per call", millis_us);
            ESP_LOGI("benchmark", "Cached class member access: %.6f µs per call", cached_us);