1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010 ARM Limited. All rights reserved.
7 * Project: CMSIS DSP Library
8 * Title: arm_fir_init_q7.c
10 * Description: Q7 FIR filter initialization function.
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Version 1.0.10 2011/7/15
15 * Big Endian support added and Merged M0 and M3/M4 Source code.
17 * Version 1.0.3 2010/11/29
18 * Re-organized the CMSIS folders and updated documentation.
20 * Version 1.0.2 2010/11/11
21 * Documentation updated.
23 * Version 1.0.1 2010/10/05
24 * Production release and review comments incorporated.
26 * Version 1.0.0 2010/09/20
27 * Production release and review comments incorporated.
29 * Version 0.0.5 2010/04/26
30 * incorporated review comments and updated with latest CMSIS layer
32 * Version 0.0.3 2010/03/10
34 * ------------------------------------------------------------------- */
39 * @ingroup groupFilters
47 * @param[in,out] *S points to an instance of the Q7 FIR filter structure.
48 * @param[in] numTaps Number of filter coefficients in the filter.
49 * @param[in] *pCoeffs points to the filter coefficients buffer.
50 * @param[in] *pState points to the state buffer.
51 * @param[in] blockSize number of samples that are processed per call.
56 * <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order:
58 * {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]}
61 * <code>pState</code> points to the array of state variables.
62 * <code>pState</code> is of length <code>numTaps+blockSize-1</code> samples, where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_fir_q7()</code>.
66 arm_fir_instance_q7 * S,
73 /* Assign filter taps */
76 /* Assign coefficient pointer */
79 /* Clear the state buffer. The size is always (blockSize + numTaps - 1) */
80 memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q7_t));
82 /* Assign state pointer */