Simon Ford
CMSIS DSP Library from CMSIS 2.0. See http://www.onarm.com/cmsis/ for full details
Dependents: K22F_DSP_Matrix_least_square BNO055-ELEC3810 1BNO055 ECE4180Project--Slave2 ... more
src/Cortex-M4-M3/FilteringFunctions/arm_iir_lattice_init_q31.c@0:1014af42efd9, 2011-03-10 (annotated)
- Committer:
- simon
- Date:
- Thu Mar 10 15:07:50 2011 +0000
- Revision:
- 0:1014af42efd9
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| simon | 0:1014af42efd9 | 1 | /*----------------------------------------------------------------------------- |
| simon | 0:1014af42efd9 | 2 | * Copyright (C) 2010 ARM Limited. All rights reserved. |
| simon | 0:1014af42efd9 | 3 | * |
| simon | 0:1014af42efd9 | 4 | * $Date: 29. November 2010 |
| simon | 0:1014af42efd9 | 5 | * $Revision: V1.0.3 |
| simon | 0:1014af42efd9 | 6 | * |
| simon | 0:1014af42efd9 | 7 | * Project: CMSIS DSP Library |
| simon | 0:1014af42efd9 | 8 | * Title: arm_iir_lattice_init_q31.c |
| simon | 0:1014af42efd9 | 9 | * |
| simon | 0:1014af42efd9 | 10 | * Description: Initialization function for the Q31 IIR lattice filter. |
| simon | 0:1014af42efd9 | 11 | * |
| simon | 0:1014af42efd9 | 12 | * Target Processor: Cortex-M4/Cortex-M3 |
| simon | 0:1014af42efd9 | 13 | * |
| simon | 0:1014af42efd9 | 14 | * Version 1.0.3 2010/11/29 |
| simon | 0:1014af42efd9 | 15 | * Re-organized the CMSIS folders and updated documentation. |
| simon | 0:1014af42efd9 | 16 | * |
| simon | 0:1014af42efd9 | 17 | * Version 1.0.2 2010/11/11 |
| simon | 0:1014af42efd9 | 18 | * Documentation updated. |
| simon | 0:1014af42efd9 | 19 | * |
| simon | 0:1014af42efd9 | 20 | * Version 1.0.1 2010/10/05 |
| simon | 0:1014af42efd9 | 21 | * Production release and review comments incorporated. |
| simon | 0:1014af42efd9 | 22 | * |
| simon | 0:1014af42efd9 | 23 | * Version 1.0.0 2010/09/20 |
| simon | 0:1014af42efd9 | 24 | * Production release and review comments incorporated |
| simon | 0:1014af42efd9 | 25 | * |
| simon | 0:1014af42efd9 | 26 | * Version 0.0.7 2010/06/10 |
| simon | 0:1014af42efd9 | 27 | * Misra-C changes done |
| simon | 0:1014af42efd9 | 28 | * ---------------------------------------------------------------------------*/ |
| simon | 0:1014af42efd9 | 29 | |
| simon | 0:1014af42efd9 | 30 | #include "arm_math.h" |
| simon | 0:1014af42efd9 | 31 | |
| simon | 0:1014af42efd9 | 32 | /** |
| simon | 0:1014af42efd9 | 33 | * @ingroup groupFilters |
| simon | 0:1014af42efd9 | 34 | */ |
| simon | 0:1014af42efd9 | 35 | |
| simon | 0:1014af42efd9 | 36 | /** |
| simon | 0:1014af42efd9 | 37 | * @addtogroup IIR_Lattice |
| simon | 0:1014af42efd9 | 38 | * @{ |
| simon | 0:1014af42efd9 | 39 | */ |
| simon | 0:1014af42efd9 | 40 | |
| simon | 0:1014af42efd9 | 41 | /** |
| simon | 0:1014af42efd9 | 42 | * @brief Initialization function for the Q31 IIR lattice filter. |
| simon | 0:1014af42efd9 | 43 | * @param[in] *S points to an instance of the Q31 IIR lattice structure. |
| simon | 0:1014af42efd9 | 44 | * @param[in] numStages number of stages in the filter. |
| simon | 0:1014af42efd9 | 45 | * @param[in] *pkCoeffs points to the reflection coefficient buffer. The array is of length numStages. |
| simon | 0:1014af42efd9 | 46 | * @param[in] *pvCoeffs points to the ladder coefficient buffer. The array is of length numStages+1. |
| simon | 0:1014af42efd9 | 47 | * @param[in] *pState points to the state buffer. The array is of length numStages+blockSize. |
| simon | 0:1014af42efd9 | 48 | * @param[in] blockSize number of samples to process. |
| simon | 0:1014af42efd9 | 49 | * @return none. |
| simon | 0:1014af42efd9 | 50 | */ |
| simon | 0:1014af42efd9 | 51 | |
| simon | 0:1014af42efd9 | 52 | void arm_iir_lattice_init_q31( |
| simon | 0:1014af42efd9 | 53 | arm_iir_lattice_instance_q31 * S, |
| simon | 0:1014af42efd9 | 54 | uint16_t numStages, |
| simon | 0:1014af42efd9 | 55 | q31_t * pkCoeffs, |
| simon | 0:1014af42efd9 | 56 | q31_t * pvCoeffs, |
| simon | 0:1014af42efd9 | 57 | q31_t * pState, |
| simon | 0:1014af42efd9 | 58 | uint32_t blockSize) |
| simon | 0:1014af42efd9 | 59 | { |
| simon | 0:1014af42efd9 | 60 | /* Assign filter taps */ |
| simon | 0:1014af42efd9 | 61 | S->numStages = numStages; |
| simon | 0:1014af42efd9 | 62 | |
| simon | 0:1014af42efd9 | 63 | /* Assign reflection coefficient pointer */ |
| simon | 0:1014af42efd9 | 64 | S->pkCoeffs = pkCoeffs; |
| simon | 0:1014af42efd9 | 65 | |
| simon | 0:1014af42efd9 | 66 | /* Assign ladder coefficient pointer */ |
| simon | 0:1014af42efd9 | 67 | S->pvCoeffs = pvCoeffs; |
| simon | 0:1014af42efd9 | 68 | |
| simon | 0:1014af42efd9 | 69 | /* Clear state buffer and size is always blockSize + numStages */ |
| simon | 0:1014af42efd9 | 70 | memset(pState, 0, (numStages + blockSize) * sizeof(q31_t)); |
| simon | 0:1014af42efd9 | 71 | |
| simon | 0:1014af42efd9 | 72 | /* Assign state pointer */ |
| simon | 0:1014af42efd9 | 73 | S->pState = pState; |
| simon | 0:1014af42efd9 | 74 | |
| simon | 0:1014af42efd9 | 75 | |
| simon | 0:1014af42efd9 | 76 | } |
| simon | 0:1014af42efd9 | 77 | |
| simon | 0:1014af42efd9 | 78 | /** |
| simon | 0:1014af42efd9 | 79 | * @} end of IIR_Lattice group |
| simon | 0:1014af42efd9 | 80 | */ |