portapack-mayhem/firmware/common/performance_counter.cpp

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/*
* Copyright (C) 2023 Bernd Herzog
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "performance_counter.hpp"
#include "ch.h"
uint8_t get_cpu_utilisation_in_percent() {
static systime_t last_time = 0;
static systime_t last_idle_ticks = 0;
auto now = chTimeNow();
auto idle_ticks = chThdGetTicks(chSysGetIdleThread());
if (last_time == 0) {
last_time = now;
last_idle_ticks = idle_ticks;
return 0;
}
int32_t time_elapsed = now - last_time;
int32_t idle_elapsed = idle_ticks - last_idle_ticks;
int32_t working_ticks = time_elapsed - idle_elapsed;
if (working_ticks < 0)
working_ticks = 0;
auto utilisation = working_ticks * 100 / time_elapsed;
last_time = now;
last_idle_ticks = idle_ticks;
if (utilisation > 100) {
return 100;
}
return (uint8_t)utilisation;
}