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| author | JanHenrik <janhenrik@janhenrik.org> | 2020-04-01 00:40:03 +0200 |
|---|---|---|
| committer | JanHenrik <janhenrik@janhenrik.org> | 2020-04-01 00:40:03 +0200 |
| commit | f7de54fc6fa6b40dfa2dfbe4c2a8ee933affa126 (patch) | |
| tree | 78465e38a01011dc9f17eb73416011310532017f /cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q31.c | |
| parent | 3ec13d81e70e52246545c720abe756ccf09fb231 (diff) | |
| download | minikbd-f7de54fc6fa6b40dfa2dfbe4c2a8ee933affa126.tar.gz minikbd-f7de54fc6fa6b40dfa2dfbe4c2a8ee933affa126.tar.bz2 minikbd-f7de54fc6fa6b40dfa2dfbe4c2a8ee933affa126.zip | |
added files
Diffstat (limited to 'cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q31.c')
| -rw-r--r-- | cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q31.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q31.c b/cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q31.c new file mode 100644 index 0000000..5e90693 --- /dev/null +++ b/cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q31.c @@ -0,0 +1,162 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_max_q31.c
+ * Description: Maximum value of a Q31 vector
+ *
+ * $Date: 27. January 2017
+ * $Revision: V.1.5.1
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2017 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 Q31 vector.
+ * @param[in] *pSrc points to the input vector
+ * @param[in] blockSize length of the input vector
+ * @param[out] *pResult maximum value returned here
+ * @param[out] *pIndex index of maximum value returned here
+ * @return none.
+ */
+
+void arm_max_q31(
+ q31_t * pSrc,
+ uint32_t blockSize,
+ q31_t * pResult,
+ uint32_t * pIndex)
+{
+#if defined (ARM_MATH_DSP)
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+
+ q31_t maxVal1, maxVal2, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex, count; /* loop counter */
+
+ /* Initialise the count value. */
+ count = 0U;
+ /* Initialise the index value to zero. */
+ outIndex = 0U;
+ /* Load first input value that act as reference value for comparision */
+ out = *pSrc++;
+
+ /* Loop unrolling */
+ blkCnt = (blockSize - 1U) >> 2U;
+
+ while (blkCnt > 0U)
+ {
+ /* Initialize maxVal to the next consecutive values one by one */
+ maxVal1 = *pSrc++;
+ maxVal2 = *pSrc++;
+
+ /* compare for the maximum value */
+ if (out < maxVal1)
+ {
+ /* Update the maximum value and its index */
+ out = maxVal1;
+ outIndex = count + 1U;
+ }
+
+ /* compare for the maximum value */
+ if (out < maxVal2)
+ {
+ /* Update the maximum value and its index */
+ out = maxVal2;
+ outIndex = count + 2U;
+ }
+
+ /* Initialize maxVal to the next consecutive values one by one */
+ maxVal1 = *pSrc++;
+ maxVal2 = *pSrc++;
+
+ /* compare for the maximum value */
+ if (out < maxVal1)
+ {
+ /* Update the maximum value and its index */
+ out = maxVal1;
+ outIndex = count + 3U;
+ }
+
+ /* compare for the maximum value */
+ if (out < maxVal2)
+ {
+ /* Update the maximum value and its index */
+ out = maxVal2;
+ outIndex = count + 4U;
+ }
+
+ count += 4U;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ /* if (blockSize - 1U) is not multiple of 4 */
+ blkCnt = (blockSize - 1U) % 4U;
+
+#else
+ /* Run the below code for Cortex-M0 */
+
+ q31_t maxVal1, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex; /* loop counter */
+
+ /* Initialise the index value to zero. */
+ outIndex = 0U;
+ /* Load first input value that act as reference value for comparision */
+ out = *pSrc++;
+
+ blkCnt = (blockSize - 1U);
+
+#endif /* #if defined (ARM_MATH_DSP) */
+
+ while (blkCnt > 0U)
+ {
+ /* Initialize maxVal to the next consecutive values one by one */
+ maxVal1 = *pSrc++;
+
+ /* compare for the maximum value */
+ if (out < maxVal1)
+ {
+ /* Update the maximum value and it's index */
+ out = maxVal1;
+ outIndex = blockSize - blkCnt;
+ }
+
+ /* Decrement the 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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