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_q31_to_q15.c   | 134 +++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_q15.c

(limited to 'Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_q15.c')

diff --git a/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_q15.c b/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_q15.c
new file mode 100644
index 0000000..8dac98d
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_q15.c
@@ -0,0 +1,134 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_q31_to_q15.c
+ * Description:  Converts the elements of the Q31 vector to Q15 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
+ */
+
+/**
+  @addtogroup q31_to_x
+  @{
+ */
+
+/**
+  @brief         Converts the elements of the Q31 vector to Q15 vector.
+  @param[in]     pSrc       points to the Q31 input vector
+  @param[out]    pDst       points to the Q15 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] = (q15_t) pSrc[n] >> 16;   0 <= n < blockSize.
+  </pre>
+ */
+
+void arm_q31_to_q15(
+  const q31_t * pSrc,
+        q15_t * pDst,
+        uint32_t blockSize)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+  const q31_t *pIn = pSrc;                             /* Source pointer */
+
+#if defined (ARM_MATH_LOOPUNROLL) && defined (ARM_MATH_DSP)
+        q31_t in1, in2, in3, in4;
+        q31_t out1, out2;
+#endif
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = blockSize >> 2U;
+
+  while (blkCnt > 0U)
+  {
+    /* C = (q15_t) (A >> 16) */
+
+    /* Convert from q31 to q15 and store result in destination buffer */
+#if defined (ARM_MATH_DSP)
+
+    in1 = *pIn++;
+    in2 = *pIn++;
+    in3 = *pIn++;
+    in4 = *pIn++;
+
+    /* pack two higher 16-bit values from two 32-bit values */
+#ifndef ARM_MATH_BIG_ENDIAN
+    out1 = __PKHTB(in2, in1, 16);
+    out2 = __PKHTB(in4, in3, 16);
+#else
+    out1 = __PKHTB(in1, in2, 16);
+    out2 = __PKHTB(in3, in4, 16);
+#endif /* #ifdef ARM_MATH_BIG_ENDIAN */
+
+    write_q15x2_ia (&pDst, out1);
+    write_q15x2_ia (&pDst, out2);
+
+#else
+
+    *pDst++ = (q15_t) (*pIn++ >> 16);
+    *pDst++ = (q15_t) (*pIn++ >> 16);
+    *pDst++ = (q15_t) (*pIn++ >> 16);
+    *pDst++ = (q15_t) (*pIn++ >> 16);
+
+#endif /* #if defined (ARM_MATH_DSP) */
+
+    /* 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 = (q15_t) (A >> 16) */
+
+    /* Convert from q31 to q15 and store result in destination buffer */
+    *pDst++ = (q15_t) (*pIn++ >> 16);
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+
+/**
+  @} end of q31_to_x group
+ */
-- 
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