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_max_f32.c 00009 * 00010 * Description: Maximum 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 00059 void arm_max_f32( 00060 float32_t * pSrc, 00061 uint32_t blockSize, 00062 float32_t * pResult, 00063 uint32_t * pIndex) 00064 { 00065 float32_t maxVal, out; /* Temporary variables to store the output value. */ 00066 uint32_t blkCnt, outIndex; /* loop counter */ 00067 00068 /* Initialise the index value to zero. */ 00069 outIndex = 0u; 00070 /* Load first input value that act as reference value for comparision */ 00071 out = *pSrc++; 00072 00073 /* Loop over blockSize number of values */ 00074 blkCnt = (blockSize - 1u); 00075 00076 #ifndef ARM_MATH_CM0 00077 00078 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00079 00080 do 00081 { 00082 /* Initialize maxVal to the next consecutive values one by one */ 00083 maxVal = *pSrc++; 00084 00085 /* compare for the maximum value */ 00086 if(out < maxVal) 00087 { 00088 /* Update the maximum value and it's index */ 00089 out = maxVal; 00090 outIndex = blockSize - blkCnt; 00091 } 00092 /* Decrement the loop counter */ 00093 blkCnt--; 00094 00095 } while(blkCnt > 0u); 00096 00097 #else 00098 00099 /* Run the below code for Cortex-M0 */ 00100 while(blkCnt > 0u) 00101 { 00102 /* Initialize maxVal to the next consecutive values one by one */ 00103 maxVal = *pSrc++; 00104 00105 /* compare for the maximum value */ 00106 if(out < maxVal) 00107 { 00108 /* Update the maximum value and it's index */ 00109 out = maxVal; 00110 outIndex = blockSize - blkCnt; 00111 } 00112 /* Decrement the loop counter */ 00113 blkCnt--; 00114 00115 } 00116 00117 #endif /* #ifndef ARM_MATH_CM0 */ 00118 00119 00120 /* Store the maximum value and it's index into destination pointers */ 00121 *pResult = out; 00122 *pIndex = outIndex; 00123 } 00124