diff options
| author | jaseg <git@jaseg.net> | 2020-10-14 12:47:28 +0200 |
|---|---|---|
| committer | jaseg <git@jaseg.net> | 2020-10-14 12:47:28 +0200 |
| commit | 6ab94e0b318884bbcb95e2ea3835f951502e1d99 (patch) | |
| tree | 4cc5794b89f89c55ff8370ae252518ab96b5fed3 /fw/midi-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_q15.c | |
| parent | 1e6e8a2062923b434b2f4f5f2a9f8c0098135b01 (diff) | |
| download | minikbd-6ab94e0b318884bbcb95e2ea3835f951502e1d99.tar.gz minikbd-6ab94e0b318884bbcb95e2ea3835f951502e1d99.tar.bz2 minikbd-6ab94e0b318884bbcb95e2ea3835f951502e1d99.zip | |
Move firmware into subdirectory
Diffstat (limited to 'fw/midi-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_q15.c')
| -rw-r--r-- | fw/midi-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_q15.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/fw/midi-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_q15.c b/fw/midi-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_q15.c new file mode 100644 index 0000000..9ef0914 --- /dev/null +++ b/fw/midi-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_q15.c @@ -0,0 +1,120 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_mean_q15.c
+ * Description: Mean value of a Q15 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 mean
+ * @{
+ */
+
+
+/**
+ * @brief Mean value of a Q15 vector.
+ * @param[in] *pSrc points to the input vector
+ * @param[in] blockSize length of the input vector
+ * @param[out] *pResult mean value returned here
+ * @return none.
+ *
+ * @details
+ * <b>Scaling and Overflow Behavior:</b>
+ * \par
+ * The function is implemented using a 32-bit internal accumulator.
+ * The input is represented in 1.15 format and is accumulated in a 32-bit
+ * accumulator in 17.15 format.
+ * There is no risk of internal overflow with this approach, and the
+ * full precision of intermediate result is preserved.
+ * Finally, the accumulator is saturated and truncated to yield a result of 1.15 format.
+ *
+ */
+
+void arm_mean_q15(
+ q15_t * pSrc,
+ uint32_t blockSize,
+ q15_t * pResult)
+{
+ q31_t sum = 0; /* Temporary result storage */
+ uint32_t blkCnt; /* loop counter */
+
+#if defined (ARM_MATH_DSP)
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+
+ q31_t in;
+
+ /*loop Unrolling */
+ blkCnt = blockSize >> 2U;
+
+ /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
+ ** a second loop below computes the remaining 1 to 3 samples. */
+ while (blkCnt > 0U)
+ {
+ /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
+ in = *__SIMD32(pSrc)++;
+ sum += ((in << 16U) >> 16U);
+ sum += (in >> 16U);
+ in = *__SIMD32(pSrc)++;
+ sum += ((in << 16U) >> 16U);
+ sum += (in >> 16U);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
+ ** No loop unrolling is used. */
+ blkCnt = blockSize % 0x4U;
+
+#else
+ /* Run the below code for Cortex-M0 */
+
+ /* Loop over blockSize number of values */
+ blkCnt = blockSize;
+
+#endif /* #if defined (ARM_MATH_DSP) */
+
+ while (blkCnt > 0U)
+ {
+ /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
+ sum += *pSrc++;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize */
+ /* Store the result to the destination */
+ *pResult = (q15_t) (sum / (q31_t)blockSize);
+}
+
+/**
+ * @} end of mean group
+ */
|