Diff: cmsis_dsp/FilteringFunctions/arm_fir_sparse_init_f32.c

Revision:

1:fdd22bb7aa52

Child:

2:da51fb522205

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cmsis_dsp/FilteringFunctions/arm_fir_sparse_init_f32.c	Wed Nov 28 12:30:09 2012 +0000
@@ -0,0 +1,102 @@
+/* ----------------------------------------------------------------------    
+* Copyright (C) 2010 ARM Limited. All rights reserved.    
+*    
+* $Date:        15. February 2012  
+* $Revision:     V1.1.0  
+*    
+* Project:         CMSIS DSP Library    
+* Title:        arm_fir_sparse_init_f32.c    
+*    
+* Description:    Floating-point sparse FIR 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 FIR_Sparse    
+ * @{    
+ */
+
+/**   
+ * @brief  Initialization function for the floating-point sparse FIR filter.   
+ * @param[in,out] *S         points to an instance of the floating-point 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 samples processed by the <code>arm_fir_sparse_f32()</code> function.    
+ */
+
+void arm_fir_sparse_init_f32(
+  arm_fir_sparse_instance_f32 * S,
+  uint16_t numTaps,
+  float32_t * pCoeffs,
+  float32_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(float32_t));
+
+  /* Assign state pointer */
+  S->pState = pState;
+
+}
+
+/**    
+ * @} end of FIR_Sparse group    
+ */