1 /*-----------------------------------------------------------------------------
2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
4 * $Date: 17. January 2013
7 * Project: CMSIS DSP Library
8 * Title: arm_fir_lattice_init_q31.c
10 * Description: Q31 FIR lattice filter initialization function.
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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44 * @ingroup groupFilters
48 * @addtogroup FIR_Lattice
53 * @brief Initialization function for the Q31 FIR lattice filter.
54 * @param[in] *S points to an instance of the Q31 FIR lattice structure.
55 * @param[in] numStages number of filter stages.
56 * @param[in] *pCoeffs points to the coefficient buffer. The array is of length numStages.
57 * @param[in] *pState points to the state buffer. The array is of length numStages.
61 void arm_fir_lattice_init_q31(
62 arm_fir_lattice_instance_q31
* S
,
67 /* Assign filter taps */
68 S
->numStages
= numStages
;
70 /* Assign coefficient pointer */
73 /* Clear state buffer and size is always numStages */
74 memset(pState
, 0, (numStages
) * sizeof(q31_t
));
76 /* Assign state pointer */
82 * @} end of FIR_Lattice group