From 86608c6770cf08c138a2bdab5855072f64be09ef Mon Sep 17 00:00:00 2001
From: joshua <joshua@joshuayun.com>
Date: Sat, 30 Dec 2023 23:54:31 -0500
Subject: initial commit

---
 .../DSP/Source/StatisticsFunctions/arm_max_q15.c   | 148 +++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c

(limited to 'Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c')

diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c
new file mode 100644
index 0000000..dbead54
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c
@@ -0,0 +1,148 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_max_q15.c
+ * Description:  Maximum value of a Q15 vector
+ *
+ * $Date:        18. March 2019
+ * $Revision:    V1.6.0
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2019 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 "arm_math.h"
+
+/**
+  @ingroup groupStats
+ */
+
+/**
+  @addtogroup Max
+  @{
+ */
+
+/**
+  @brief         Maximum value of a Q15 vector.
+  @param[in]     pSrc       points to the input vector
+  @param[in]     blockSize  number of samples in input vector
+  @param[out]    pResult    maximum value returned here
+  @param[out]    pIndex     index of maximum value returned here
+  @return        none
+ */
+
+void arm_max_q15(
+  const q15_t * pSrc,
+        uint32_t blockSize,
+        q15_t * pResult,
+        uint32_t * pIndex)
+{
+        q15_t maxVal, out;                             /* Temporary variables to store the output value. */
+        uint32_t blkCnt, outIndex;                     /* Loop counter */
+
+#if defined (ARM_MATH_LOOPUNROLL)
+        uint32_t index;                                /* index of maximum value */
+#endif
+
+  /* Initialise index value to zero. */
+  outIndex = 0U;
+  /* Load first input value that act as reference value for comparision */
+  out = *pSrc++;
+
+#if defined (ARM_MATH_LOOPUNROLL)
+  /* Initialise index of maximum value. */
+  index = 0U;
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = (blockSize - 1U) >> 2U;
+
+  while (blkCnt > 0U)
+  {
+    /* Initialize maxVal to next consecutive values one by one */
+    maxVal = *pSrc++;
+
+    /* compare for the maximum value */
+    if (out < maxVal)
+    {
+      /* Update the maximum value and it's index */
+      out = maxVal;
+      outIndex = index + 1U;
+    }
+
+    maxVal = *pSrc++;
+    if (out < maxVal)
+    {
+      out = maxVal;
+      outIndex = index + 2U;
+    }
+
+    maxVal = *pSrc++;
+    if (out < maxVal)
+    {
+      out = maxVal;
+      outIndex = index + 3U;
+    }
+
+    maxVal = *pSrc++;
+    if (out < maxVal)
+    {
+      out = maxVal;
+      outIndex = index + 4U;
+    }
+
+    index += 4U;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = (blockSize - 1U) % 4U;
+
+#else
+
+  /* Initialize blkCnt with number of samples */
+  blkCnt = (blockSize - 1U);
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+
+  while (blkCnt > 0U)
+  {
+    /* Initialize maxVal to the next consecutive values one by one */
+    maxVal = *pSrc++;
+
+    /* compare for the maximum value */
+    if (out < maxVal)
+    {
+      /* Update the maximum value and it's index */
+      out = maxVal;
+      outIndex = blockSize - blkCnt;
+    }
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Store the maximum value and it's index into destination pointers */
+  *pResult = out;
+  *pIndex = outIndex;
+}
+
+/**
+  @} end of Max group
+ */
-- 
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