150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
/****************************************************************************
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Copyright(c) 2019 by Aerospace C.Power (Chongqing) Microelectronics. ALL RIGHTS RESERVED.
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This Information is proprietary to Aerospace C.Power (Chongqing) Microelectronics and MAY NOT
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be copied by any method or incorporated into another program without
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the express written consent of Aerospace C.Power. This Information or any portion
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thereof remains the property of Aerospace C.Power. The Information contained herein
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is believed to be accurate and Aerospace C.Power assumes no responsibility or
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liability for its use in any way and conveys no license or title under
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any patent or copyright and makes no representation or warranty that this
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Information is free from patent or copyright infringement.
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****************************************************************************/
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#include "math_log10.h"
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const math_log10_tbl_t log10_tbl[] = {
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{0.0, 1 },
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{0.2, 2 },
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{0.4, 3 },
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{0.6, 4 },
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{0.7, 5 },
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{0.8, 6 },
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{0.9, 8 },
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{1.0, 10 },
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{1.1, 13 },
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{1.2, 16 },
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{1.3, 20 },
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{1.4, 25 },
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{1.5, 32 },
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{1.6, 40 },
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{1.7, 50 },
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{1.8, 63 },
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{1.9, 79 },
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{2.0, 100 },
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{2.1, 126 },
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{2.2, 158 },
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{2.3, 200 },
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{2.4, 251 },
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{2.5, 316 },
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{2.6, 398 },
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{2.7, 501 },
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{2.8, 631 },
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{2.9, 794 },
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{3.0, 1000 },
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{3.1, 1259 },
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{3.2, 1585 },
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{3.3, 1995 },
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{3.4, 2512 },
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{3.5, 3162 },
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{3.6, 3981 },
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{3.7, 5012 },
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{3.8, 6310 },
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{3.9, 7943 },
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{4.0, 10000 },
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{4.1, 12589 },
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{4.2, 15849 },
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{4.3, 19953 },
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{4.4, 25119 },
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{4.5, 31623 },
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{4.6, 39811 },
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{4.7, 50119 },
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{4.8, 63096 },
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{4.9, 79433 },
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{5.0, 100000 },
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{5.1, 125893 },
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{5.2, 158489 },
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{5.3, 199526 },
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{5.4, 251189 },
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{5.5, 316228 },
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{5.6, 398107 },
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{5.7, 501187 },
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{5.8, 630957 },
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{5.9, 794328 },
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{6.0, 1000000 },
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{6.1, 1258925 },
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{6.2, 1584893 },
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{6.3, 1995262 },
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{6.4, 2511886 },
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{6.5, 3162277 },
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{6.6, 3981071 },
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{6.7, 5011872 },
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{6.8, 6309573 },
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{6.9, 7943282 },
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{7.0, 10000000 },
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{7.1, 12589254 },
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{7.2, 15848931 },
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{7.3, 19952623 },
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{7.4, 25118864 },
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{7.5, 31622776 },
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{7.6, 39810717 },
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{7.7, 50118723 },
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{7.8, 63095734 },
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{7.9, 79432823 },
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{8.0, 100000000 },
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{8.1, 125892541 },
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{8.2, 158489319 },
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{8.3, 199526231 },
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{8.4, 251188643 },
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{8.5, 316227766 },
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{8.6, 398107170 },
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{8.7, 501187233 },
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{8.8, 630957344 },
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{8.9, 794328234 },
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{9.0, 1000000000},
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{9.1, 1258925411},
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{9.2, 1584893192},
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{9.3, 1995262314},
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{9.4, 2511886431},
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{9.5, 3162277660},
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{9.6, 3981071705},
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/* the maximum value of uint32 type is 4294967295 */
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{9.7, 5011872336},
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{9.8, 6309573444},
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{9.9, 7943282347},
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{10.0, 10000000000},
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{11.0, 100000000000},
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{12.0, 1000000000000},
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{13.0, 10000000000000},
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{14.0, 100000000000000},
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{15.0, 1000000000000000},
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{16.0, 10000000000000000},
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{17.0, 100000000000000000},
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{18.0, 1000000000000000000},
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//{19.0, 10000000000000000000}, /* uint64_t max */
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};
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float mlog10(uint64_t raw_data)
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{
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uint32_t i;
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if(raw_data <= log10_tbl[0].raw_data){
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return log10_tbl[0].log10_val;
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}
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for(i = 1; i < sizeof(log10_tbl)/sizeof(math_log10_tbl_t); i++)
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{
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if(raw_data == log10_tbl[i].raw_data){
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return log10_tbl[i].log10_val;
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}
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else if(raw_data > log10_tbl[i-1].raw_data && \
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raw_data < log10_tbl[i].raw_data){
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return log10_tbl[i-1].log10_val;
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}
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}
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return log10_tbl[i-1].log10_val;
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}
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