add some code

managed_components/espressif__esp-dsp/examples/dotprod/main/CMakeLists.txt

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+idf_component_register(SRCS "dsps_dotproduct_main.c")

managed_components/espressif__esp-dsp/examples/dotprod/main/dsps_dotproduct_main.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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_system.h"
+#include "driver/spi_master.h"
+#include "soc/gpio_struct.h"
+#include "driver/gpio.h"
+#include "driver/uart.h"
+#include "soc/uart_struct.h"
+
+#include "esp_dsp.h"
+
+static const char *TAG = "main";
+
+// This example shows how to use dsps_dotprod_f32 and dsps_dotprode_f32 functions
+
+#define N_SAMPLES 256
+int N = N_SAMPLES;
+__attribute__((aligned(16)))
+float input1[N_SAMPLES];
+__attribute__((aligned(16)))
+float input2[N_SAMPLES];
+
+void app_main()
+{
+    esp_err_t ret;
+    ESP_LOGI(TAG, "Start Example.");
+
+    // The example will calculate n!
+    //Initialize an input arrays
+    for (int i = 0 ; i < N ; i++) {
+        input1[i] = 1;
+        input2[i] = i;
+    }
+    float result1 = 0;
+    unsigned int start_b = dsp_get_cpu_cycle_count();
+    ret = dsps_dotprod_f32(input1, input2, &result1, 101);
+    unsigned int end_b = dsp_get_cpu_cycle_count();
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "Operation error = %i", ret);
+    }
+    ESP_LOGI(TAG, "The sum of 101 elements from 0..100 = %f", result1);
+    ESP_LOGI(TAG, "Operation for 101 samples take %i cycles", end_b - start_b);
+
+    ESP_LOGI(TAG, "End Example.");
+}

managed_components/espressif__esp-dsp/examples/dotprod/main/idf_component.yml

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+dependencies:
+  espressif/esp-dsp:
+    override_path: "../../../"
+    version: "*"