diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_mult_q15.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_mult_q15.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_mult_q15.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_mult_q15.c new file mode 100644 index 0000000..270dc73 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_mult_q15.c @@ -0,0 +1,143 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_mult_q15.c
+ * Description: Q15 vector multiplication
+ *
+ * $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 groupMath
+ */
+
+/**
+ @addtogroup BasicMult
+ @{
+ */
+
+/**
+ @brief Q15 vector multiplication
+ @param[in] pSrcA points to first input vector
+ @param[in] pSrcB points to second input vector
+ @param[out] pDst points to output vector
+ @param[in] blockSize number of samples in each vector
+ @return none
+
+ @par Scaling and Overflow Behavior
+ The function uses saturating arithmetic.
+ Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated.
+ */
+
+void arm_mult_q15(
+ const q15_t * pSrcA,
+ const q15_t * pSrcB,
+ q15_t * pDst,
+ uint32_t blockSize)
+{
+ uint32_t blkCnt; /* Loop counter */
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+#if defined (ARM_MATH_DSP)
+ q31_t inA1, inA2, inB1, inB2; /* Temporary input variables */
+ q15_t out1, out2, out3, out4; /* Temporary output variables */
+ q31_t mul1, mul2, mul3, mul4; /* Temporary variables */
+#endif
+
+ /* Loop unrolling: Compute 4 outputs at a time */
+ blkCnt = blockSize >> 2U;
+
+ while (blkCnt > 0U)
+ {
+ /* C = A * B */
+
+#if defined (ARM_MATH_DSP)
+ /* read 2 samples at a time from sourceA */
+ inA1 = read_q15x2_ia ((q15_t **) &pSrcA);
+ /* read 2 samples at a time from sourceB */
+ inB1 = read_q15x2_ia ((q15_t **) &pSrcB);
+ /* read 2 samples at a time from sourceA */
+ inA2 = read_q15x2_ia ((q15_t **) &pSrcA);
+ /* read 2 samples at a time from sourceB */
+ inB2 = read_q15x2_ia ((q15_t **) &pSrcB);
+
+ /* multiply mul = sourceA * sourceB */
+ mul1 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1 >> 16));
+ mul2 = (q31_t) ((q15_t) (inA1 ) * (q15_t) (inB1 ));
+ mul3 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) (inB2 >> 16));
+ mul4 = (q31_t) ((q15_t) (inA2 ) * (q15_t) (inB2 ));
+
+ /* saturate result to 16 bit */
+ out1 = (q15_t) __SSAT(mul1 >> 15, 16);
+ out2 = (q15_t) __SSAT(mul2 >> 15, 16);
+ out3 = (q15_t) __SSAT(mul3 >> 15, 16);
+ out4 = (q15_t) __SSAT(mul4 >> 15, 16);
+
+ /* store result to destination */
+#ifndef ARM_MATH_BIG_ENDIAN
+ write_q15x2_ia (&pDst, __PKHBT(out2, out1, 16));
+ write_q15x2_ia (&pDst, __PKHBT(out4, out3, 16));
+#else
+ write_q15x2_ia (&pDst, __PKHBT(out1, out2, 16));
+ write_q15x2_ia (&pDst, __PKHBT(out3, out4, 16));
+#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
+
+#else
+ *pDst++ = (q15_t) __SSAT((((q31_t) (*pSrcA++) * (*pSrcB++)) >> 15), 16);
+ *pDst++ = (q15_t) __SSAT((((q31_t) (*pSrcA++) * (*pSrcB++)) >> 15), 16);
+ *pDst++ = (q15_t) __SSAT((((q31_t) (*pSrcA++) * (*pSrcB++)) >> 15), 16);
+ *pDst++ = (q15_t) __SSAT((((q31_t) (*pSrcA++) * (*pSrcB++)) >> 15), 16);
+#endif
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+ /* Loop unrolling: Compute remaining outputs */
+ blkCnt = blockSize % 0x4U;
+
+#else
+
+ /* Initialize blkCnt with number of samples */
+ blkCnt = blockSize;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+
+ while (blkCnt > 0U)
+ {
+ /* C = A * B */
+
+ /* Multiply inputs and store result in destination buffer. */
+ *pDst++ = (q15_t) __SSAT((((q31_t) (*pSrcA++) * (*pSrcB++)) >> 15), 16);
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+}
+
+/**
+ @} end of BasicMult group
+ */
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