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smooth: Use integers rather than floats to store tme

pull/1/head
Andri Yngvason 2019-12-29 10:36:08 +00:00
parent baad0ecd68
commit c794ca3822
3 changed files with 7 additions and 5 deletions
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4
include/smooth.h
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@ -16,6 +16,8 @@
#pragma once #pragma once
#include <stdint.h>
/* /*
* This is an exponential smoothing filter with a time constant. * This is an exponential smoothing filter with a time constant.
* *
@ -27,7 +29,7 @@
struct smooth { struct smooth {
double time_constant; double time_constant;
double last_time; uint64_t last_time;
double last_result; double last_result;
}; };

4
include/time-util.h
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@ -1,11 +1,11 @@
#include <time.h> #include <time.h>
#include <stdint.h> #include <stdint.h>
static inline double gettime_s(void) static inline uint64_t gettime_us(void)
{ {
struct timespec ts = { 0 }; struct timespec ts = { 0 };
clock_gettime(CLOCK_MONOTONIC, &ts); clock_gettime(CLOCK_MONOTONIC, &ts);
return (double)ts.tv_sec + (double)ts.tv_nsec / 1.0e-9; return ts.tv_sec * 1000000ULL + (double)ts.tv_nsec / 1000ULL;
} }
static inline uint32_t gettime_ms(void) static inline uint32_t gettime_ms(void)

4
src/smooth.c
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@ -21,8 +21,8 @@
double smooth(struct smooth* self, double input) double smooth(struct smooth* self, double input)
{ {
double now = gettime_s(); uint64_t now = gettime_us();
double dt = now - self->last_time; double dt = (now - self->last_time) * 1.0e-6;
self->last_time = now; self->last_time = now;
double factor = 1.0 - exp(-dt / self->time_constant); double factor = 1.0 - exp(-dt / self->time_constant);