/*-----------------------------------------------------------------------------    
* Copyright (C) 2010 ARM Limited. All rights reserved.    
*    
* $Date: 14/06/07 1:57a $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    
 */
