

#include "arm_math.h"

/**    
 * @ingroup groupFilters    
 */

/**    
 * @addtogroup IIR_Lattice    
 * @{    
 */

  /**    
   * @brief Initialization function for the Q31 IIR lattice filter.    
   * @param[in] *S points to an instance of the Q31 IIR lattice structure.    
   * @param[in] numStages number of stages in the filter.    
   * @param[in] *pkCoeffs points to the reflection coefficient buffer.  The array is of length numStages.    
   * @param[in] *pvCoeffs points to the ladder coefficient buffer.  The array is of length numStages+1.    
   * @param[in] *pState points to the state buffer.  The array is of length numStages+blockSize.    
   * @param[in] blockSize number of samples to process.    
   * @return none.    
   */

void arm_iir_lattice_init_q31(
  arm_iir_lattice_instance_q31 * S,
  uint16_t numStages,
  q31_t * pkCoeffs,
  q31_t * pvCoeffs,
  q31_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(q31_t));

  /* Assign state pointer */
  S->pState = pState;


}

/**    
 * @} end of IIR_Lattice group    
 */
