Files
kunlun/plc/halphy/hw/math_log10.c
2024-09-28 14:24:04 +08:00

151 lines
4.4 KiB
C

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