Diff: src/Cortex-M4-M3/FilteringFunctions/arm_fir_sparse_init_q31.c

Revision:

0:1014af42efd9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Cortex-M4-M3/FilteringFunctions/arm_fir_sparse_init_q31.c	Thu Mar 10 15:07:50 2011 +0000
@@ -0,0 +1,95 @@
+/* ----------------------------------------------------------------------  
+* Copyright (C) 2010 ARM Limited. All rights reserved.  
+*  
+* $Date:        29. November 2010  
+* $Revision: 	V1.0.3  
+*  
+* Project: 	    CMSIS DSP Library  
+* Title:        arm_fir_sparse_init_q31.c  
+*  
+* Description:	Q31 sparse FIR 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 FIR_Sparse  
+ * @{  
+ */ 
+ 
+/** 
+ * @brief  Initialization function for the Q31 sparse FIR filter. 
+ * @param[in,out] *S         points to an instance of the Q31 sparse FIR structure. 
+ * @param[in]     numTaps    number of nonzero coefficients in the filter. 
+ * @param[in]     *pCoeffs   points to the array of filter coefficients. 
+ * @param[in]     *pState    points to the state buffer. 
+ * @param[in]     *pTapDelay points to the array of offset times. 
+ * @param[in]     maxDelay   maximum offset time supported. 
+ * @param[in]     blockSize  number of samples that will be processed per block. 
+ * @return none 
+ *  
+ * <b>Description:</b>  
+ * \par  
+ * <code>pCoeffs</code> holds the filter coefficients and has length <code>numTaps</code>.  
+ * <code>pState</code> holds the filter's state variables and must be of length  
+ * <code>maxDelay + blockSize</code>, where <code>maxDelay</code>  
+ * is the maximum number of delay line values.  
+ * <code>blockSize</code> is the number of words processed by <code>arm_fir_sparse_q31()</code> function.  
+ */ 
+ 
+void arm_fir_sparse_init_q31( 
+  arm_fir_sparse_instance_q31 * S, 
+  uint16_t numTaps, 
+  q31_t * pCoeffs, 
+  q31_t * pState, 
+  int32_t * pTapDelay, 
+  uint16_t maxDelay, 
+  uint32_t blockSize) 
+{ 
+  /* Assign filter taps */ 
+  S->numTaps = numTaps; 
+ 
+  /* Assign coefficient pointer */ 
+  S->pCoeffs = pCoeffs; 
+ 
+  /* Assign TapDelay pointer */ 
+  S->pTapDelay = pTapDelay; 
+ 
+  /* Assign MaxDelay */ 
+  S->maxDelay = maxDelay; 
+ 
+  /* reset the stateIndex to 0 */ 
+  S->stateIndex = 0u; 
+ 
+  /* Clear state buffer and size is always maxDelay + blockSize */ 
+  memset(pState, 0, (maxDelay + blockSize) * sizeof(q31_t)); 
+ 
+  /* Assign state pointer */ 
+  S->pState = pState; 
+ 
+} 
+ 
+/**  
+ * @} end of FIR_Sparse group  
+ */