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Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_power_f64.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_power_f64.c
+ * Description:  Sum of the squares of the elements of a floating-point vector
+ *
+ * $Date:        13 September 2021
+ * $Revision:    V1.10.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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
+ *
+ * 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 "dsp/statistics_functions.h"
+
+/**
+  @ingroup groupStats
+ */
+
+/**
+  @addtogroup power
+  @{
+ */
+
+/**
+  @brief         Sum of the squares of the elements of a floating-point vector.
+  @param[in]     pSrc       points to the input vector
+  @param[in]     blockSize  number of samples in input vector
+  @param[out]    pResult    sum of the squares value returned here
+  @return        none
+ */
+void arm_power_f64(
+  const float64_t * pSrc,
+        uint32_t blockSize,
+        float64_t * pResult)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+        float64_t sum = 0.;                          /* Temporary result storage */
+        float64_t in;                                  /* Temporary variable to store input value */
+
+  /* Initialize blkCnt with number of samples */
+  blkCnt = blockSize;
+
+  while (blkCnt > 0U)
+  {
+    /* C = A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1] */
+
+    /* Compute Power and store result in a temporary variable, sum. */
+    in = *pSrc++;
+    sum += in * in;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Store result to destination */
+  *pResult = sum;
+}
+
+/**
+  @} end of power group
+ */