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managed_components/espressif__esp-dsp/modules/math/sqrt/include/dsps_sqrt.h

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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.
+
+#ifndef _dsps_sqrt_H_
+#define _dsps_sqrt_H_
+#include "dsp_err.h"
+
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/**@{*/
+/**
+ * @brief   square root approximation
+ *
+ * The function takes square root approximation
+ * x[i] ~ sqrt(y[i]); i=[0..len)
+ * The implementation use ANSI C and could be compiled and run on any platform
+ *
+ * @param[in] input: input array
+ * @param output: output array
+ * @param len: amount of operations for arrays
+ *
+ * @return
+ *      - ESP_OK on success
+ *      - One of the error codes from DSP library
+ */
+esp_err_t dsps_sqrt_f32_ansi(const float *input, float *output, int len);
+//esp_err_t dsps_sqrt_s32_ansi(const int32_t *input, int16_t *output, int len);
+
+/**@{*/
+/**
+ * @brief   square root approximation
+ *
+ * The function takes square root approximation
+ * x ~ sqrt(y);
+ * The implementation use ANSI C and could be compiled and run on any platform
+ *
+ * @param[in] data: input value
+ *
+ * @return
+ *      - square root value
+ */
+float dsps_sqrtf_f32_ansi(const float data);
+
+
+/**@{*/
+/**
+ * @brief   inverted square root approximation
+ *
+ * The function takes inverted square root approximation
+ * x ~ 1/sqrt(y);
+ * The implementation use ANSI C and could be compiled and run on any platform
+ *
+ * @param[in] data: input value
+ *
+ * @return
+ *      - inverted square root value
+ */
+float dsps_inverted_sqrtf_f32_ansi(float data );
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#ifdef CONFIG_DSP_OPTIMIZED
+#define dsps_sqrt_f32 dsps_sqrt_f32_ansi
+#define dsps_sqrtf_f32 dsps_sqrtf_f32_ansi
+#define dsps_inverted_sqrtf_f32 dsps_inverted_sqrtf_f32_ansi
+#else
+#define dsps_sqrt_f32 dsps_sqrt_f32_ansi
+#define dsps_sqrtf_f32 dsps_sqrtf_f32_ansi
+#define dsps_inverted_sqrtf_f32 dsps_inverted_sqrtf_f32_ansi
+#endif
+
+#endif // _dsps_sqrt_H_