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/BasicMathFunctions/arm_sub_q15.c    | 126 +++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_q15.c

(limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_q15.c')

diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_q15.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_q15.c
new file mode 100644
index 0000000..07420c2
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_q15.c
@@ -0,0 +1,126 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_sub_q15.c
+ * Description:  Q15 vector subtraction
+ *
+ * $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 BasicSub
+  @{
+ */
+
+/**
+  @brief         Q15 vector subtraction.
+  @param[in]     pSrcA      points to the first input vector
+  @param[in]     pSrcB      points to the second input vector
+  @param[out]    pDst       points to the 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_sub_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;
+  q31_t inB1, inB2;
+#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 times 2 samples at a time from sourceA */
+    inA1 = read_q15x2_ia ((q15_t **) &pSrcA);
+    inA2 = read_q15x2_ia ((q15_t **) &pSrcA);
+    /* read 2 times 2 samples at a time from sourceB */
+    inB1 = read_q15x2_ia ((q15_t **) &pSrcB);
+    inB2 = read_q15x2_ia ((q15_t **) &pSrcB);
+
+    /* Subtract and store 2 times 2 samples at a time */
+    write_q15x2_ia (&pDst, __QSUB16(inA1, inB1));
+    write_q15x2_ia (&pDst, __QSUB16(inA2, inB2));
+#else
+    *pDst++ = (q15_t) __SSAT(((q31_t) *pSrcA++ - *pSrcB++), 16);
+    *pDst++ = (q15_t) __SSAT(((q31_t) *pSrcA++ - *pSrcB++), 16);
+    *pDst++ = (q15_t) __SSAT(((q31_t) *pSrcA++ - *pSrcB++), 16);
+    *pDst++ = (q15_t) __SSAT(((q31_t) *pSrcA++ - *pSrcB++), 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 */
+
+    /* Subtract and store result in destination buffer. */
+#if defined (ARM_MATH_DSP)
+    *pDst++ = (q15_t) __QSUB16(*pSrcA++, *pSrcB++);
+#else
+    *pDst++ = (q15_t) __SSAT(((q31_t) *pSrcA++ - *pSrcB++), 16);
+#endif
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+
+/**
+  @} end of BasicSub group
+ */
-- 
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