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| author | joshua <joshua@joshuayun.com> | 2023-12-30 23:54:31 -0500 |
|---|---|---|
| committer | joshua <joshua@joshuayun.com> | 2023-12-30 23:54:31 -0500 |
| commit | 86608c6770cf08c138a2bdab5855072f64be09ef (patch) | |
| tree | 494a61b3ef37e76f9235a0d10f5c93d97290a35f /Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q15_to_float.c | |
| download | sdr-software-master.tar.gz | |
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q15_to_float.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q15_to_float.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q15_to_float.c b/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q15_to_float.c new file mode 100644 index 0000000..a87946c --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q15_to_float.c @@ -0,0 +1,166 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_q15_to_float.c
+ * Description: Converts the elements of the Q15 vector to floating-point 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 groupSupport
+ */
+
+/**
+ * @defgroup q15_to_x Convert 16-bit Integer value
+ */
+
+/**
+ @addtogroup q15_to_x
+ @{
+ */
+
+/**
+ @brief Converts the elements of the Q15 vector to floating-point vector.
+ @param[in] pSrc points to the Q15 input vector
+ @param[out] pDst points to the floating-point output vector
+ @param[in] blockSize number of samples in each vector
+ @return none
+
+ @par Details
+ The equation used for the conversion process is:
+ <pre>
+ pDst[n] = (float32_t) pSrc[n] / 32768; 0 <= n < blockSize.
+ </pre>
+ */
+
+#if defined(ARM_MATH_NEON_EXPERIMENTAL)
+void arm_q15_to_float(
+ const q15_t * pSrc,
+ float32_t * pDst,
+ uint32_t blockSize)
+{
+ const q15_t *pIn = pSrc; /* Src pointer */
+ uint32_t blkCnt; /* loop counter */
+
+ int16x8_t inV;
+ int32x4_t inV0, inV1;
+ float32x4_t outV;
+
+ blkCnt = blockSize >> 3U;
+
+ /* Compute 8 outputs at a time.
+ ** a second loop below computes the remaining 1 to 7 samples. */
+ while (blkCnt > 0U)
+ {
+ /* C = (float32_t) A / 32768 */
+ /* convert from q15 to float and then store the results in the destination buffer */
+ inV = vld1q_s16(pIn);
+ pIn += 8;
+
+ inV0 = vmovl_s16(vget_low_s16(inV));
+ inV1 = vmovl_s16(vget_high_s16(inV));
+
+ outV = vcvtq_n_f32_s32(inV0,15);
+ vst1q_f32(pDst, outV);
+ pDst += 4;
+
+ outV = vcvtq_n_f32_s32(inV1,15);
+ vst1q_f32(pDst, outV);
+ pDst += 4;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ /* If the blockSize is not a multiple of 8, compute any remaining output samples here.
+ ** No loop unrolling is used. */
+ blkCnt = blockSize & 7;
+
+
+ while (blkCnt > 0U)
+ {
+ /* C = (float32_t) A / 32768 */
+ /* convert from q15 to float and then store the results in the destination buffer */
+ *pDst++ = ((float32_t) * pIn++ / 32768.0f);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+}
+#else
+void arm_q15_to_float(
+ const q15_t * pSrc,
+ float32_t * pDst,
+ uint32_t blockSize)
+{
+ uint32_t blkCnt; /* Loop counter */
+ const q15_t *pIn = pSrc; /* Source pointer */
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+ /* Loop unrolling: Compute 4 outputs at a time */
+ blkCnt = blockSize >> 2U;
+
+ while (blkCnt > 0U)
+ {
+ /* C = (float32_t) A / 32768 */
+
+ /* Convert from q15 to float and store result in destination buffer */
+ *pDst++ = ((float32_t) * pIn++ / 32768.0f);
+ *pDst++ = ((float32_t) * pIn++ / 32768.0f);
+ *pDst++ = ((float32_t) * pIn++ / 32768.0f);
+ *pDst++ = ((float32_t) * pIn++ / 32768.0f);
+
+ /* 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 = (float32_t) A / 32768 */
+
+ /* Convert from q15 to float and store result in destination buffer */
+ *pDst++ = ((float32_t) *pIn++ / 32768.0f);
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+}
+#endif /* #if defined(ARM_MATH_NEON) */
+
+/**
+ @} end of q15_to_x group
+ */
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