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_min_q31.c 00009 * 00010 * Description: Minimum value of a 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 00053 void arm_min_q31( 00054 q31_t * pSrc, 00055 uint32_t blockSize, 00056 q31_t * pResult, 00057 uint32_t * pIndex) 00058 { 00059 q31_t minVal, out; /* Temporary variables to store the output value. */ 00060 uint32_t blkCnt, outIndex; /* loop counter */ 00061 00062 /* Initialise the index value to zero. */ 00063 outIndex = 0u; 00064 /* Load first input value that act as reference value for comparision */ 00065 out = *pSrc++; 00066 00067 #ifndef ARM_MATH_CM0 00068 00069 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00070 00071 /* Loop over blockSize number of values */ 00072 blkCnt = (blockSize - 1u); 00073 00074 do 00075 { 00076 /* Initialize minVal to the next consecutive values one by one */ 00077 minVal = *pSrc++; 00078 00079 /* compare for the minimum value */ 00080 if(out > minVal) 00081 { 00082 /* Update the minimum value and its index */ 00083 out = minVal; 00084 outIndex = blockSize - blkCnt; 00085 } 00086 00087 blkCnt--; 00088 00089 } while(blkCnt > 0u); 00090 00091 #else 00092 00093 /* Run the below code for Cortex-M0 */ 00094 00095 /* Loop over blockSize -1 number of values */ 00096 blkCnt = (blockSize - 1u); 00097 00098 while(blkCnt > 0u) 00099 { 00100 /* Initialize minVal to the next consecutive values one by one */ 00101 minVal = *pSrc++; 00102 00103 /* compare for the minimum value */ 00104 if(out > minVal) 00105 { 00106 /* Update the minimum value and its index */ 00107 out = minVal; 00108 outIndex = blockSize - blkCnt; 00109 } 00110 00111 /* Decrement the loop counter */ 00112 blkCnt--; 00113 00114 } 00115 00116 #endif /* #ifndef ARM_MATH_CM0 */ 00117 00118 /* Store the minimum value and its index into destination pointers */ 00119 *pResult = out; 00120 *pIndex = outIndex; 00121 } 00122