From 4447282260be0780eb6e36f5e953bf56888a5688 Mon Sep 17 00:00:00 2001
From: px4dev <px4@purgatory.org>
Date: Sun, 6 Jan 2013 12:52:05 -0800
Subject: Integrate the interesting parts of the CMSIS 3.01 (r3p1) DSP library

---
 .../FilteringFunctions/arm_iir_lattice_init_q15.c  | 86 ++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_iir_lattice_init_q15.c

(limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_iir_lattice_init_q15.c')

diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_iir_lattice_init_q15.c b/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_iir_lattice_init_q15.c
new file mode 100644
index 000000000..7dac99fca
--- /dev/null
+++ b/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_iir_lattice_init_q15.c
@@ -0,0 +1,86 @@
+/*-----------------------------------------------------------------------------    
+* Copyright (C) 2010 ARM Limited. All rights reserved.    
+*    
+* $Date:        15. February 2012  
+* $Revision: 	V1.1.0  
+*    
+* Project: 	    CMSIS DSP Library    
+* Title:        arm_iir_lattice_init_q15.c    
+*    
+* Description:  Q15 IIR lattice filter 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"
+
+/**    
+ * @ingroup groupFilters    
+ */
+
+/**    
+ * @addtogroup IIR_Lattice    
+ * @{    
+ */
+
+  /**    
+   * @brief Initialization function for the Q15 IIR lattice filter.    
+   * @param[in] *S points to an instance of the Q15 IIR lattice structure.    
+   * @param[in] numStages  number of stages in the filter.    
+   * @param[in] *pkCoeffs points to reflection coefficient buffer.  The array is of length numStages.    
+   * @param[in] *pvCoeffs points to ladder coefficient buffer.  The array is of length numStages+1.    
+   * @param[in] *pState points to state buffer.  The array is of length numStages+blockSize.    
+   * @param[in] blockSize number of samples to process per call.    
+   * @return none.    
+   */
+
+void arm_iir_lattice_init_q15(
+  arm_iir_lattice_instance_q15 * S,
+  uint16_t numStages,
+  q15_t * pkCoeffs,
+  q15_t * pvCoeffs,
+  q15_t * pState,
+  uint32_t blockSize)
+{
+  /* Assign filter taps */
+  S->numStages = numStages;
+
+  /* Assign reflection coefficient pointer */
+  S->pkCoeffs = pkCoeffs;
+
+  /* Assign ladder coefficient pointer */
+  S->pvCoeffs = pvCoeffs;
+
+  /* Clear state buffer and size is always blockSize + numStages */
+  memset(pState, 0, (numStages + blockSize) * sizeof(q15_t));
+
+  /* Assign state pointer */
+  S->pState = pState;
+
+
+}
+
+/**    
+ * @} end of IIR_Lattice group    
+ */
-- 
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