CMSIS DSP Software Library: arm_q15_to_q7.c Source File
Main Page
Modules
Data Structures
Files
Examples
File List
Globals
arm_q15_to_q7.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_q15_to_q7.c
00009 *
00010 * Description: Processing function for the Conversion from Q15 to Q7
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
00027 #include "arm_math.h"
00028
00057 void arm_q15_to_q7(
00058 q15_t * pSrc,
00059 q7_t * pDst,
00060 uint32_t blockSize)
00061 {
00062 q15_t *pIn = pSrc; /* Src pointer */
00063 uint32_t blkCnt; /* loop counter */
00064
00065 /*loop Unrolling */
00066 blkCnt = blockSize >> 2u;
00067
00068 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
00069 ** a second loop below computes the remaining 1 to 3 samples. */
00070 while(blkCnt > 0u)
00071 {
00072 /* C = (q7_t) A >> 8 */
00073 /* convert from q15 to q7 and then store the results in the destination buffer */
00074 *pDst++ = (q7_t) (*pIn++ >> 8);
00075 *pDst++ = (q7_t) (*pIn++ >> 8);
00076 *pDst++ = (q7_t) (*pIn++ >> 8);
00077 *pDst++ = (q7_t) (*pIn++ >> 8);
00078
00079 /* Decrement the loop counter */
00080 blkCnt--;
00081 }
00082
00083 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
00084 ** No loop unrolling is used. */
00085 blkCnt = blockSize % 0x4u;
00086
00087 while(blkCnt > 0u)
00088 {
00089 /* C = (q7_t) A >> 8 */
00090 /* convert from q15 to q7 and then store the results in the destination buffer */
00091 *pDst++ = (q7_t) (*pIn++ >> 8);
00092
00093 /* Decrement the loop counter */
00094 blkCnt--;
00095 }
00096
00097 }
00098
All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines
Generated on Mon Nov 29 2010 17:19:57 for CMSIS DSP Software Library by
1.7.2
Wyszukiwarka
Podobne podstrony:
arm float to q7? sourcearm q15 to float? sourcearm q15 to q7?arm q15 to q31? sourcearm q31 to q7? sourcearm q31 to q7?arm q15 to q31?arm conv partial q7? sourcearm float to q7?arm q7 to q15? sourcearm float to q31? sourcearm q15 to float?arm fir init q7? sourcearm fir sparse q7? sourcearm q7 to float? sourcearm q31 to q15? sourcearm float to q15? sourcearm q31 to float? sourcearm q7 to q31? sourcewięcej podobnych podstron