00001 /*----------------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 15. July 2011 00005 * $Revision: V1.0.10 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_iir_lattice_init_q15.c 00009 * 00010 * Description: Q15 IIR lattice filter initialization function. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 00013 * 00014 * Version 1.0.10 2011/7/15 00015 * Big Endian support added and Merged M0 and M3/M4 Source code. 00016 * 00017 * Version 1.0.3 2010/11/29 00018 * Re-organized the CMSIS folders and updated documentation. 00019 * 00020 * Version 1.0.2 2010/11/11 00021 * Documentation updated. 00022 * 00023 * Version 1.0.1 2010/10/05 00024 * Production release and review comments incorporated. 00025 * 00026 * Version 1.0.0 2010/09/20 00027 * Production release and review comments incorporated 00028 * 00029 * Version 0.0.7 2010/06/10 00030 * Misra-C changes done 00031 * ---------------------------------------------------------------------------*/ 00032 00033 #include "arm_math.h" 00034 00055 void arm_iir_lattice_init_q15( 00056 arm_iir_lattice_instance_q15 * S, 00057 uint16_t numStages, 00058 q15_t * pkCoeffs, 00059 q15_t * pvCoeffs, 00060 q15_t * pState, 00061 uint32_t blockSize) 00062 { 00063 /* Assign filter taps */ 00064 S->numStages = numStages; 00065 00066 /* Assign reflection coefficient pointer */ 00067 S->pkCoeffs = pkCoeffs; 00068 00069 /* Assign ladder coefficient pointer */ 00070 S->pvCoeffs = pvCoeffs; 00071 00072 /* Clear state buffer and size is always blockSize + numStages */ 00073 memset(pState, 0, (numStages + blockSize) * sizeof(q15_t)); 00074 00075 /* Assign state pointer */ 00076 S->pState = pState; 00077 00078 00079 } 00080