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_q7_to_q31.c 00009 * 00010 * Description: Converts the elements of the Q7 vector to Q31 vector. 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 00030 #include "arm_math.h" 00031 00059 void arm_q7_to_q31( 00060 q7_t * pSrc, 00061 q31_t * pDst, 00062 uint32_t blockSize) 00063 { 00064 q7_t *pIn = pSrc; /* Src pointer */ 00065 uint32_t blkCnt; /* loop counter */ 00066 00067 #ifndef ARM_MATH_CM0 00068 00069 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00070 00071 /*loop Unrolling */ 00072 blkCnt = blockSize >> 2u; 00073 00074 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00075 ** a second loop below computes the remaining 1 to 3 samples. */ 00076 while(blkCnt > 0u) 00077 { 00078 /* C = (q31_t) A << 24 */ 00079 /* convert from q7 to q31 and then store the results in the destination buffer */ 00080 *pDst++ = (q31_t) * pIn++ << 24; 00081 *pDst++ = (q31_t) * pIn++ << 24; 00082 *pDst++ = (q31_t) * pIn++ << 24; 00083 *pDst++ = (q31_t) * pIn++ << 24; 00084 00085 /* Decrement the loop counter */ 00086 blkCnt--; 00087 } 00088 00089 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00090 ** No loop unrolling is used. */ 00091 blkCnt = blockSize % 0x4u; 00092 00093 #else 00094 00095 /* Run the below code for Cortex-M0 */ 00096 00097 /* Loop over blockSize number of values */ 00098 blkCnt = blockSize; 00099 00100 #endif /* #ifndef ARM_MATH_CM0 */ 00101 00102 while(blkCnt > 0u) 00103 { 00104 /* C = (q31_t) A << 24 */ 00105 /* convert from q7 to q31 and then store the results in the destination buffer */ 00106 *pDst++ = (q31_t) * pIn++ << 24; 00107 00108 /* Decrement the loop counter */ 00109 blkCnt--; 00110 } 00111 00112 } 00113