arm_fir_init_q15.c
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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_fir_init_q15.c 00009 * 00010 * Description: Q15 FIR 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 0.0.5 2010/04/26 00030 * incorporated review comments and updated with latest CMSIS layer 00031 * 00032 * Version 0.0.3 2010/03/10 00033 * Initial version 00034 * ------------------------------------------------------------------- */ 00035 00036 #include "arm_math.h" 00037 00085 arm_status arm_fir_init_q15( 00086 arm_fir_instance_q15 * S, 00087 uint16_t numTaps, 00088 q15_t * pCoeffs, 00089 q15_t * pState, 00090 uint32_t blockSize) 00091 { 00092 arm_status status; 00093 00094 00095 #ifndef ARM_MATH_CM0 00096 00097 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00098 00099 /* The Number of filter coefficients in the filter must be even and at least 4 */ 00100 if((numTaps < 4u) || (numTaps & 0x1u)) 00101 { 00102 status = ARM_MATH_ARGUMENT_ERROR; 00103 } 00104 else 00105 { 00106 /* Assign filter taps */ 00107 S->numTaps = numTaps; 00108 00109 /* Assign coefficient pointer */ 00110 S->pCoeffs = pCoeffs; 00111 00112 /* Clear the state buffer. The size is always (blockSize + numTaps - 1) */ 00113 memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q15_t)); 00114 00115 /* Assign state pointer */ 00116 S->pState = pState; 00117 00118 status = ARM_MATH_SUCCESS; 00119 } 00120 00121 return (status); 00122 00123 #else 00124 00125 /* Run the below code for Cortex-M0 */ 00126 00127 /* Assign filter taps */ 00128 S->numTaps = numTaps; 00129 00130 /* Assign coefficient pointer */ 00131 S->pCoeffs = pCoeffs; 00132 00133 /* Clear the state buffer. The size is always (blockSize + numTaps - 1) */ 00134 memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q15_t)); 00135 00136 /* Assign state pointer */ 00137 S->pState = pState; 00138 00139 status = ARM_MATH_SUCCESS; 00140 00141 return (status); 00142 00143 #endif /* #ifndef ARM_MATH_CM0 */ 00144 00145 } 00146
