CMSIS DSP Software Library: arm_fir_init_q15.c Source File
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arm_fir_init_q15.c
Go to the documentation of this file.00001 /* ----------------------------------------------------------------------
00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
00003 *
00004 * $Date: 29. November 2010
00005 * $Revision: V1.0.3
00006 *
00007 * Project: CMSIS DSP Library
00008 * Title: arm_fir_init_q15.c
00009 *
00010 * Description: Q15 FIR filter initialization function.
00011 *
00012 * Target Processor: Cortex-M4/Cortex-M3
00013 *
00014 * Version 1.0.3 2010/11/29
00015 * Re-organized the CMSIS folders and updated documentation.
00016 *
00017 * Version 1.0.2 2010/11/11
00018 * Documentation updated.
00019 *
00020 * Version 1.0.1 2010/10/05
00021 * Production release and review comments incorporated.
00022 *
00023 * Version 1.0.0 2010/09/20
00024 * Production release and review comments incorporated.
00025 *
00026 * Version 0.0.5 2010/04/26
00027 * incorporated review comments and updated with latest CMSIS layer
00028 *
00029 * Version 0.0.3 2010/03/10
00030 * Initial version
00031 * ------------------------------------------------------------------- */
00032
00033 #include "arm_math.h"
00034
00082 arm_status arm_fir_init_q15(
00083 arm_fir_instance_q15 * S,
00084 uint16_t numTaps,
00085 q15_t * pCoeffs,
00086 q15_t * pState,
00087 uint32_t blockSize)
00088 {
00089 arm_status status;
00090
00091 /* The Number of filter coefficients in the filter must be even and at least 4 */
00092 if((numTaps < 4u) || (numTaps & 0x1u))
00093 {
00094 status = ARM_MATH_ARGUMENT_ERROR;
00095 }
00096 else
00097 {
00098 /* Assign filter taps */
00099 S->numTaps = numTaps;
00100
00101 /* Assign coefficient pointer */
00102 S->pCoeffs = pCoeffs;
00103
00104 /* Clear the state buffer. The size is always (blockSize + numTaps - 1) */
00105 memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q15_t));
00106
00107 /* Assign state pointer */
00108 S->pState = pState;
00109
00110 status = ARM_MATH_SUCCESS;
00111 }
00112
00113 return (status);
00114 }
00115
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