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_f32.c 00009 * 00010 * Description: Minimum value of a floating-point 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 00060 void arm_min_f32( 00061 float32_t * pSrc, 00062 uint32_t blockSize, 00063 float32_t * pResult, 00064 uint32_t * pIndex) 00065 { 00066 float32_t minVal, out; /* Temporary variables to store the output value. */ 00067 uint32_t blkCnt, outIndex; /* loop counter */ 00068 00069 /* Initialise the index value to zero. */ 00070 outIndex = 0u; 00071 /* Load first input value that act as reference value for comparision */ 00072 out = *pSrc++; 00073 00074 #ifndef ARM_MATH_CM0 00075 00076 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00077 00078 00079 /* Loop over blockSize number of values */ 00080 blkCnt = (blockSize - 1u); 00081 00082 do 00083 { 00084 /* Initialize minVal to the next consecutive values one by one */ 00085 minVal = *pSrc++; 00086 00087 /* compare for the minimum value */ 00088 if(out > minVal) 00089 { 00090 /* Update the minimum value and it's index */ 00091 out = minVal; 00092 outIndex = blockSize - blkCnt; 00093 } 00094 00095 blkCnt--; 00096 00097 } while(blkCnt > 0u); 00098 00099 #else 00100 00101 /* Run the below code for Cortex-M0 */ 00102 00103 /* Loop over blockSize - 1 number of values */ 00104 blkCnt = (blockSize - 1u); 00105 00106 while(blkCnt > 0u) 00107 { 00108 /* Initialize minVal to the next consecutive values one by one */ 00109 minVal = *pSrc++; 00110 00111 /* compare for the minimum value */ 00112 if(out > minVal) 00113 { 00114 /* Update the minimum value and it's index */ 00115 out = minVal; 00116 outIndex = blockSize - blkCnt; 00117 } 00118 /* Decrement the loop counter */ 00119 blkCnt--; 00120 00121 } 00122 00123 #endif /* #ifndef ARM_MATH_CM0 */ 00124 00125 00126 /* Store the minimum value and it's index into destination pointers */ 00127 *pResult = out; 00128 *pIndex = outIndex; 00129 } 00130