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/SupportFunctions/arm_q15_to_float.c | 166 +++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q15_to_float.c

(limited to 'Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q15_to_float.c')

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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