test code for SPI communications with any board
math_ops.cpp@17:f200f87b4087, 2022-04-15 (annotated)
- Committer:
- adimmit
- Date:
- Fri Apr 15 14:11:25 2022 +0000
- Revision:
- 17:f200f87b4087
- Parent:
- 0:76c761d3caf1
changed to mini cheetah version;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
adimmit | 0:76c761d3caf1 | 1 | |
adimmit | 0:76c761d3caf1 | 2 | #include "math_ops.h" |
adimmit | 0:76c761d3caf1 | 3 | |
adimmit | 0:76c761d3caf1 | 4 | |
adimmit | 0:76c761d3caf1 | 5 | float fmaxf(float x, float y){ |
adimmit | 0:76c761d3caf1 | 6 | /// Returns maximum of x, y /// |
adimmit | 0:76c761d3caf1 | 7 | return (((x)>(y))?(x):(y)); |
adimmit | 0:76c761d3caf1 | 8 | } |
adimmit | 0:76c761d3caf1 | 9 | |
adimmit | 0:76c761d3caf1 | 10 | float fminf(float x, float y){ |
adimmit | 0:76c761d3caf1 | 11 | /// Returns minimum of x, y /// |
adimmit | 0:76c761d3caf1 | 12 | return (((x)<(y))?(x):(y)); |
adimmit | 0:76c761d3caf1 | 13 | } |
adimmit | 0:76c761d3caf1 | 14 | |
adimmit | 0:76c761d3caf1 | 15 | float fmaxf3(float x, float y, float z){ |
adimmit | 0:76c761d3caf1 | 16 | /// Returns maximum of x, y, z /// |
adimmit | 0:76c761d3caf1 | 17 | return (x > y ? (x > z ? x : z) : (y > z ? y : z)); |
adimmit | 0:76c761d3caf1 | 18 | } |
adimmit | 0:76c761d3caf1 | 19 | |
adimmit | 0:76c761d3caf1 | 20 | float fminf3(float x, float y, float z){ |
adimmit | 0:76c761d3caf1 | 21 | /// Returns minimum of x, y, z /// |
adimmit | 0:76c761d3caf1 | 22 | return (x < y ? (x < z ? x : z) : (y < z ? y : z)); |
adimmit | 0:76c761d3caf1 | 23 | } |
adimmit | 0:76c761d3caf1 | 24 | |
adimmit | 0:76c761d3caf1 | 25 | void limit_norm(float *x, float *y, float limit){ |
adimmit | 0:76c761d3caf1 | 26 | /// Scales the lenght of vector (x, y) to be <= limit /// |
adimmit | 0:76c761d3caf1 | 27 | float norm = sqrt(*x * *x + *y * *y); |
adimmit | 0:76c761d3caf1 | 28 | if(norm > limit){ |
adimmit | 0:76c761d3caf1 | 29 | *x = *x * limit/norm; |
adimmit | 0:76c761d3caf1 | 30 | *y = *y * limit/norm; |
adimmit | 0:76c761d3caf1 | 31 | } |
adimmit | 0:76c761d3caf1 | 32 | } |
adimmit | 0:76c761d3caf1 | 33 | |
adimmit | 0:76c761d3caf1 | 34 | |
adimmit | 0:76c761d3caf1 | 35 | int float_to_uint(float x, float x_min, float x_max, int bits){ |
adimmit | 0:76c761d3caf1 | 36 | /// Converts a float to an unsigned int, given range and number of bits /// |
adimmit | 0:76c761d3caf1 | 37 | float span = x_max - x_min; |
adimmit | 0:76c761d3caf1 | 38 | float offset = x_min; |
adimmit | 0:76c761d3caf1 | 39 | return (int) ((x-offset)*((float)((1<<bits)-1))/span); |
adimmit | 0:76c761d3caf1 | 40 | } |
adimmit | 0:76c761d3caf1 | 41 | |
adimmit | 0:76c761d3caf1 | 42 | |
adimmit | 0:76c761d3caf1 | 43 | float uint_to_float(int x_int, float x_min, float x_max, int bits){ |
adimmit | 0:76c761d3caf1 | 44 | /// converts unsigned int to float, given range and number of bits /// |
adimmit | 0:76c761d3caf1 | 45 | float span = x_max - x_min; |
adimmit | 0:76c761d3caf1 | 46 | float offset = x_min; |
adimmit | 0:76c761d3caf1 | 47 | return ((float)x_int)*span/((float)((1<<bits)-1)) + offset; |
adimmit | 0:76c761d3caf1 | 48 | } |