1 files changed, 110 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_divide_q15.c b/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_divide_q15.c
new file mode 100644
index 0000000..9c26e06
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+++ b/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_divide_q15.c
@@ -0,0 +1,110 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_cos_q15.c
+ * Description:  Fast cosine calculation for Q15 values
+ *
+ * $Date:        23 April 2021
+ * $Revision:    V1.9.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2021 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 "dsp/fast_math_functions.h"
+#include "arm_common_tables.h"
+
+#include <stdlib.h>
+
+/**
+  @ingroup groupFastMath
+ */
+
+/**
+  @defgroup divide Fixed point division
+
+ */
+
+/**
+  @addtogroup divide
+  @{
+ */
+
+/**
+  @brief         Fixed point division
+  @param[in]     numerator    Numerator
+  @param[in]     denominator  Denominator
+  @param[out]    quotient     Quotient value normalized between -1.0 and 1.0
+  @param[out]    shift        Shift left value to get the unnormalized quotient
+  @return        error status
+
+  When dividing by 0, an error ARM_MATH_NANINF is returned. And the quotient is forced
+  to the saturated negative or positive value.
+ */
+
+arm_status arm_divide_q15(q15_t numerator,
+  q15_t denominator,
+  q15_t *quotient,
+  int16_t *shift)
+{
+  int16_t sign=0;
+  q31_t temp;
+  int16_t shiftForNormalizing;
+
+  *shift = 0;
+
+  sign = (numerator>>15) ^ (denominator>>15);
+
+  if (denominator == 0)
+  {
+     if (sign)
+     {
+        *quotient = 0x8000;
+     }
+     else
+     {
+        *quotient = 0x7FFF;
+     }
+     return(ARM_MATH_NANINF);
+  }
+
+  arm_abs_q15(&numerator,&numerator,1);
+  arm_abs_q15(&denominator,&denominator,1);
+  
+  temp = ((q31_t)numerator << 15) / ((q31_t)denominator);
+
+  shiftForNormalizing= 17 - __CLZ(temp);
+  if (shiftForNormalizing > 0)
+  {
+     *shift = shiftForNormalizing;
+     temp = temp >> shiftForNormalizing;
+  }
+
+  if (sign)
+  {
+    temp = -temp;
+  }
+
+  *quotient=temp;
+
+  return(ARM_MATH_SUCCESS);
+}
+
+/**
+  @} end of divide group
+ */