1 files changed, 97 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_norm_init_q31.c b/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_norm_init_q31.c
new file mode 100644
index 0000000..79d629f
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_norm_init_q31.c
@@ -0,0 +1,97 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_lms_norm_init_q31.c
+ * Description:  Q31 NLMS filter initialization function
+ *
+ * $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"
+#include "arm_common_tables.h"
+
+/**
+  @addtogroup LMS_NORM
+  @{
+ */
+
+/**
+  @brief         Initialization function for Q31 normalized LMS filter.
+  @param[in]     S         points to an instance of the Q31 normalized LMS filter structure.
+  @param[in]     numTaps   number of filter coefficients.
+  @param[in]     pCoeffs   points to coefficient buffer.
+  @param[in]     pState    points to state buffer.
+  @param[in]     mu        step size that controls filter coefficient updates.
+  @param[in]     blockSize number of samples to process.
+  @param[in]     postShift bit shift applied to coefficients.
+  @return        none
+
+  @par           Details
+                   <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order:
+  <pre>
+     {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]}
+  </pre>
+                   The initial filter coefficients serve as a starting point for the adaptive filter.
+                   <code>pState</code> points to an array of length <code>numTaps+blockSize-1</code> samples,
+                   where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_lms_norm_q31()</code>.
+ */
+
+void arm_lms_norm_init_q31(
+        arm_lms_norm_instance_q31 * S,
+        uint16_t numTaps,
+        q31_t * pCoeffs,
+        q31_t * pState,
+        q31_t mu,
+        uint32_t blockSize,
+        uint8_t postShift)
+{
+  /* Assign filter taps */
+  S->numTaps = numTaps;
+
+  /* Assign coefficient pointer */
+  S->pCoeffs = pCoeffs;
+
+  /* Clear state buffer and size is always blockSize + numTaps - 1 */
+  memset(pState, 0, (numTaps + (blockSize - 1U)) * sizeof(q31_t));
+
+  /* Assign post Shift value applied to coefficients */
+  S->postShift = postShift;
+
+  /* Assign state pointer */
+  S->pState = pState;
+
+  /* Assign Step size value */
+  S->mu = mu;
+
+  /* Initialize reciprocal pointer table */
+  S->recipTable = (q31_t *) armRecipTableQ31;
+
+  /* Initialise Energy to zero */
+  S->energy = 0;
+
+  /* Initialise x0 to zero */
+  S->x0 = 0;
+}
+
+/**
+  @} end of LMS_NORM group
+ */