Diff: src/Cortex-M4-M3/FilteringFunctions/arm_iir_lattice_init_q15.c

Revision:

0:1014af42efd9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Cortex-M4-M3/FilteringFunctions/arm_iir_lattice_init_q15.c	Thu Mar 10 15:07:50 2011 +0000
@@ -0,0 +1,80 @@
+/*-----------------------------------------------------------------------------  
+* Copyright (C) 2010 ARM Limited. All rights reserved.  
+*  
+* $Date:        29. November 2010  
+* $Revision: 	V1.0.3  
+*  
+* Project: 	    CMSIS DSP Library  
+* Title:        arm_iir_lattice_init_q15.c  
+*  
+* Description:  Q15 IIR lattice filter initialization function.  
+*  
+* Target Processor: Cortex-M4/Cortex-M3
+*  
+* 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  
+ */