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author | px4dev <px4@purgatory.org> | 2013-01-06 12:52:05 -0800 |
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committer | px4dev <px4@purgatory.org> | 2013-01-06 12:52:05 -0800 |
commit | 4447282260be0780eb6e36f5e953bf56888a5688 (patch) | |
tree | 3ba1e976d998d433397343b79a0612af52075aef /apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_init_q15.c | |
parent | 659543f852d18197f68fafee5db5671567b74f4b (diff) | |
download | px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.tar.gz px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.tar.bz2 px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.zip |
Integrate the interesting parts of the CMSIS 3.01 (r3p1) DSP library
Diffstat (limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_init_q15.c')
-rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_init_q15.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_init_q15.c b/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_init_q15.c new file mode 100644 index 000000000..a1cf1b001 --- /dev/null +++ b/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_init_q15.c @@ -0,0 +1,107 @@ +/*-----------------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_lms_norm_init_q15.c
+*
+* Description: Q15 NLMS initialization function.
+*
+* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
+*
+* Version 1.1.0 2012/02/15
+* Updated with more optimizations, bug fixes and minor API changes.
+*
+* Version 1.0.10 2011/7/15
+* Big Endian support added and Merged M0 and M3/M4 Source code.
+*
+* Version 1.0.3 2010/11/29
+* Re-organized the CMSIS folders and updated documentation.
+*
+* Version 1.0.2 2010/11/11
+* Documentation updated.
+*
+* Version 1.0.1 2010/10/05
+* Production release and review comments incorporated.
+*
+* Version 1.0.0 2010/09/20
+* Production release and review comments incorporated
+*
+* Version 0.0.7 2010/06/10
+* Misra-C changes done
+* ---------------------------------------------------------------------------*/
+
+#include "arm_math.h"
+#include "arm_common_tables.h"
+
+/**
+ * @addtogroup LMS_NORM
+ * @{
+ */
+
+ /**
+ * @brief Initialization function for Q15 normalized LMS filter.
+ * @param[in] *S points to an instance of the Q15 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.
+ *
+ * <b>Description:</b>
+ * \par
+ * <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 the array of state variables and size of array is
+ * <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_q15()</code>.
+ */
+
+void arm_lms_norm_init_q15(
+ arm_lms_norm_instance_q15 * S,
+ uint16_t numTaps,
+ q15_t * pCoeffs,
+ q15_t * pState,
+ q15_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(q15_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 = (q15_t *) armRecipTableQ15;
+
+ /* Initialise Energy to zero */
+ S->energy = 0;
+
+ /* Initialise x0 to zero */
+ S->x0 = 0;
+
+}
+
+/**
+ * @} end of LMS_NORM group
+ */
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