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Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/StatisticsFunctions/arm_min_q15.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/StatisticsFunctions/arm_min_q15.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/StatisticsFunctions/arm_min_q15.c b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/StatisticsFunctions/arm_min_q15.c new file mode 100644 index 0000000000..a31ca72bfd --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/StatisticsFunctions/arm_min_q15.c @@ -0,0 +1,177 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2013 ARM Limited. All rights reserved. +* +* $Date: 17. January 2013 +* $Revision: V1.4.1 +* +* Project: CMSIS DSP Library +* Title: arm_min_q15.c +* +* Description: Minimum value of a Q15 vector. +* +* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 +* +* Redistribution and use in source and binary forms, with or without +* modification, are permitted provided that the following conditions +* are met: +* - Redistributions of source code must retain the above copyright +* notice, this list of conditions and the following disclaimer. +* - Redistributions in binary form must reproduce the above copyright +* notice, this list of conditions and the following disclaimer in +* the documentation and/or other materials provided with the +* distribution. +* - Neither the name of ARM LIMITED nor the names of its contributors +* may be used to endorse or promote products derived from this +* software without specific prior written permission. +* +* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS +* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, +* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +* POSSIBILITY OF SUCH DAMAGE. +* ---------------------------------------------------------------------------- */ + +#include "arm_math.h" + +/** + * @ingroup groupStats + */ + + +/** + * @addtogroup Min + * @{ + */ + + +/** + * @brief Minimum value of a Q15 vector. + * @param[in] *pSrc points to the input vector + * @param[in] blockSize length of the input vector + * @param[out] *pResult minimum value returned here + * @param[out] *pIndex index of minimum value returned here + * @return none. + * + */ + +void arm_min_q15( + q15_t * pSrc, + uint32_t blockSize, + q15_t * pResult, + uint32_t * pIndex) +{ +#ifndef ARM_MATH_CM0_FAMILY + + /* Run the below code for Cortex-M4 and Cortex-M3 */ + q15_t minVal1, minVal2, out; /* Temporary variables to store the output value. */ + uint32_t blkCnt, outIndex, count; /* loop counter */ + + /* Initialise the count value. */ + count = 0u; + /* Initialise the index value to zero. */ + outIndex = 0u; + /* Load first input value that act as reference value for comparision */ + out = *pSrc++; + + /* Loop unrolling */ + blkCnt = (blockSize - 1u) >> 2u; + + while(blkCnt > 0) + { + /* Initialize minVal to the next consecutive values one by one */ + minVal1 = *pSrc++; + minVal2 = *pSrc++; + + /* compare for the minimum value */ + if(out > minVal1) + { + /* Update the minimum value and its index */ + out = minVal1; + outIndex = count + 1u; + } + + minVal1 = *pSrc++; + + /* compare for the minimum value */ + if(out > minVal2) + { + /* Update the minimum value and its index */ + out = minVal2; + outIndex = count + 2u; + } + + minVal2 = *pSrc++; + + /* compare for the minimum value */ + if(out > minVal1) + { + /* Update the minimum value and its index */ + out = minVal1; + outIndex = count + 3u; + } + + /* compare for the minimum value */ + if(out > minVal2) + { + /* Update the minimum value and its index */ + out = minVal2; + outIndex = count + 4u; + } + + count += 4u; + + blkCnt--; + } + + /* if (blockSize - 1u ) is not multiple of 4 */ + blkCnt = (blockSize - 1u) % 4u; + +#else + + /* Run the below code for Cortex-M0 */ + q15_t minVal1, out; /* Temporary variables to store the output value. */ + uint32_t blkCnt, outIndex; /* loop counter */ + + blkCnt = (blockSize - 1u); + + /* Initialise the index value to zero. */ + outIndex = 0u; + /* Load first input value that act as reference value for comparision */ + out = *pSrc++; + +#endif // #ifndef ARM_MATH_CM0_FAMILY + + while(blkCnt > 0) + { + /* Initialize minVal to the next consecutive values one by one */ + minVal1 = *pSrc++; + + /* compare for the minimum value */ + if(out > minVal1) + { + /* Update the minimum value and it's index */ + out = minVal1; + outIndex = blockSize - blkCnt; + } + + blkCnt--; + + } + + + + /* Store the minimum value and its index into destination pointers */ + *pResult = out; + *pIndex = outIndex; +} + +/** + * @} end of Min group + */ |