add some code

managed_components/espressif__esp-dsp/modules/support/sfdr/test/test_dsps_sfdr_f32.c

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+// 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";
+
+TEST_CASE("dsps_sfdr_f32 functionality", "[dsps]")
+{
+    int N = 512;
+    float *data = (float *)malloc(N * 2 * sizeof(float));
+    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();
+    free(data);
+}