text: // Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #include <string.h>
  #include "unity.h"
  #include "dsp_platform.h"
  #include "esp_log.h"
  
  #include "dsps_view.h"
  #include "dsps_sfdr.h"
  #include "dsps_fft2r.h"
  
  
  static const char *TAG = "dsps_sfdr_f32";
  
  static float data[1024];
  
  TEST_CASE("dsps_sfdr_f32 functionality", "[dsps]")
  {
      int N = sizeof(data) / sizeof(float) / 2;
      int check_bin = 32;
      float sfdr_exp = 4;
      for (int i = 0 ; i < N ; i++) {
          data[i] = 4 * sinf(M_PI / N * check_bin * i) / (N / 2);
          data[i] += sinf(M_PI / N * check_bin * i * 2) / (N / 2);
      }
      
      float sfdr = dsps_sfdr_f32(data, N, 1);
      TEST_ASSERT_EQUAL( (int)20 * log10(sfdr_exp), (int)sfdr);
      ESP_LOGI(TAG, "dsps_sfdr_f32 = %f dB", sfdr);
      dsps_fft2r_deinit_fc32();
  }
  