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use library log function

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This commit is contained in:
Ralph Metzler 2016-04-12 12:18:35 +02:00
parent 64f21d8f99
commit ab25eeefdf
1 changed files with 3 additions and 46 deletions
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49
frontends/cxd2843.c
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@ -35,8 +35,11 @@
#include <asm/div64.h> #include <asm/div64.h>
#include "dvb_frontend.h" #include "dvb_frontend.h"
#include "dvb_math.h"
#include "cxd2843.h" #include "cxd2843.h"
#define Log10x100(x) ((s32)(((((u64) intlog2(x) * 0x1e1a5e2e) >> 47 ) + 1) >> 1))
#define USE_ALGO 1 #define USE_ALGO 1
enum demod_type { CXD2843, CXD2837, CXD2838 }; enum demod_type { CXD2843, CXD2837, CXD2838 };
@ -1504,52 +1507,6 @@ static int read_signal_strength(struct dvb_frontend *fe, u16 *strength)
return 0; return 0;
} }
static s32 Log10x100(u32 x)
{
static u32 LookupTable[100] = {
101157945, 103514217, 105925373, 108392691, 110917482,
113501082, 116144861, 118850223, 121618600, 124451461,
127350308, 130316678, 133352143, 136458314, 139636836,
142889396, 146217717, 149623566, 153108746, 156675107,
160324539, 164058977, 167880402, 171790839, 175792361,
179887092, 184077200, 188364909, 192752491, 197242274,
201836636, 206538016, 211348904, 216271852, 221309471,
226464431, 231739465, 237137371, 242661010, 248313311,
254097271, 260015956, 266072506, 272270131, 278612117,
285101827, 291742701, 298538262, 305492111, 312607937,
319889511, 327340695, 334965439, 342767787, 350751874,
358921935, 367282300, 375837404, 384591782, 393550075,
402717034, 412097519, 421696503, 431519077, 441570447,
451855944, 462381021, 473151259, 484172368, 495450191,
506990708, 518800039, 530884444, 543250331, 555904257,
568852931, 582103218, 595662144, 609536897, 623734835,
638263486, 653130553, 668343918, 683911647, 699841996,
716143410, 732824533, 749894209, 767361489, 785235635,
803526122, 822242650, 841395142, 860993752, 881048873,
901571138, 922571427, 944060876, 966050879, 988553095,
};
s32 y;
int i;
if (x == 0)
return 0;
y = 800;
if (x >= 1000000000) {
x /= 10;
y += 100;
}
while (x < 100000000) {
x *= 10;
y -= 100;
}
i = 0;
while (i < 100 && x > LookupTable[i])
i += 1;
y += i;
return y;
}
#if 0 #if 0
static void GetPLPIds(struct cxd_state *state, u32 nValues, static void GetPLPIds(struct cxd_state *state, u32 nValues,
u8 *Values, u32 *Returned) u8 *Values, u32 *Returned)