diff options
Diffstat (limited to 'apps/plugins')
-rw-r--r-- | apps/plugins/lib/fixedpoint.h | 52 |
1 files changed, 2 insertions, 50 deletions
diff --git a/apps/plugins/lib/fixedpoint.h b/apps/plugins/lib/fixedpoint.h index 1631f8d6d8..811a1d9b81 100644 --- a/apps/plugins/lib/fixedpoint.h +++ b/apps/plugins/lib/fixedpoint.h | |||
@@ -20,55 +20,7 @@ | |||
20 | * KIND, either express or implied. | 20 | * KIND, either express or implied. |
21 | * | 21 | * |
22 | ****************************************************************************/ | 22 | ****************************************************************************/ |
23 | |||
24 | /** PLUGINS - FIXED POINT MATH ROUTINES - USAGE | ||
25 | * | ||
26 | * - x and y arguments are fixed point integers | ||
27 | * - fracbits is the number of fractional bits in the argument(s) | ||
28 | * - functions return long fixed point integers with the specified number | ||
29 | * of fractional bits unless otherwise specified | ||
30 | * | ||
31 | * Calculate sin and cos of an angle: | ||
32 | * fp_sincos(phase, *cos) | ||
33 | * where phase is a 32 bit unsigned integer with 0 representing 0 | ||
34 | * and 0xFFFFFFFF representing 2*pi, and *cos is the address to | ||
35 | * a long signed integer. Value returned is a long signed integer | ||
36 | * from -0x80000000 to 0x7fffffff, representing -1 to 1 respectively. | ||
37 | * That is, value is a fixed point integer with 31 fractional bits. | ||
38 | * | ||
39 | * Take square root of a fixed point number: | ||
40 | * fp_sqrt(x, fracbits) | ||
41 | * | ||
42 | * Calculate sin or cos of an angle (very fast, from a table): | ||
43 | * fp14_sin(angle) | ||
44 | * fp14_cos(angle) | ||
45 | * where angle is a non-fixed point integer in degrees. Value | ||
46 | * returned is a fixed point integer with 14 fractional bits. | ||
47 | * | ||
48 | * Calculate the natural log of a positive fixed point integer | ||
49 | * fp16_log(x) | ||
50 | * where x and the value returned are fixed point integers | ||
51 | * with 16 fractional bits. | ||
52 | */ | ||
53 | |||
54 | #ifndef _FIXEDPOINT_H_PLUGINS | 23 | #ifndef _FIXEDPOINT_H_PLUGINS |
55 | #define _FIXEDPOINT_H_PLUGINS | 24 | #define _FIXEDPOINT_H_PLUGINS |
56 | 25 | #include "../../../firmware/include/fixedpoint.h" | |
57 | long fp_sincos(unsigned long phase, long *cos); | 26 | #endif /* _FIXEDPOINT_H_PLUGINS */ |
58 | long fp_sqrt(long a, unsigned int fracbits); | ||
59 | long fp14_cos(int val); | ||
60 | long fp14_sin(int val); | ||
61 | long fp16_log(int x); | ||
62 | long fp16_exp(int x); | ||
63 | |||
64 | unsigned long isqrt(unsigned long x); | ||
65 | |||
66 | /* fast unsigned multiplication (16x16bit->32bit or 32x32bit->32bit, | ||
67 | * whichever is faster for the architecture) */ | ||
68 | #ifdef CPU_ARM | ||
69 | #define FMULU(a, b) ((uint32_t) (((uint32_t) (a)) * ((uint32_t) (b)))) | ||
70 | #else /* SH1, coldfire */ | ||
71 | #define FMULU(a, b) ((uint32_t) (((uint16_t) (a)) * ((uint16_t) (b)))) | ||
72 | #endif | ||
73 | |||
74 | #endif | ||