cpu_load.cpp File Reference

A CPU load estimation. More...

#include "../includes/cpu_load.h"
#include "Arduino.h"

Go to the source code of this file.

Macros
#define	CPU_MAX_LOOP_PER_SECOND   8327007u

Functions
uint8_t	readCpuLoadPercent (void)
	Get the value of the CPU load. More...
void	cpuLoadCallback (void)
void	osSystickHandler ()

Variables
volatile uint32_t	idleCyclesCount = 0
	Access to idleCyclesCount needed by the COUNT_IDLE_CYCLE macro. More...
volatile uint8_t	cpuLoadPercent = 0
uint16_t	cpuLoadTimeCount = TIME_CPU_CYCLE_RESET
uint32_t	cpuLoadLatestCycleCount = 0

Detailed Description

A CPU load estimation.

Author

Makers For Life

Copyright

Copyright (c) 2020 Makers For Life

Definition in file cpu_load.cpp.

Macro Definition Documentation

CPU_MAX_LOOP_PER_SECOND

#define CPU_MAX_LOOP_PER_SECOND   8327007u

Definition at line 35 of file cpu_load.cpp.

Function Documentation

cpuLoadCallback()

void cpuLoadCallback

(

void

)

Definition at line 41 of file cpu_load.cpp.

                           {
    cpuLoadTimeCount--;
    if (cpuLoadTimeCount == 0u) {
        cpuLoadTimeCount = TIME_CPU_CYCLE_RESET;
        // Overflow won't be a problem, same type
        uint32_t delta = idleCyclesCount - cpuLoadLatestCycleCount;
        cpuLoadLatestCycleCount = idleCyclesCount;
        if (delta > CPU_MAX_LOOP_PER_SECOND) {
            delta = CPU_MAX_LOOP_PER_SECOND;
        }
        cpuLoadPercent = static_cast<uint8_t>(100u - (100u * delta) / CPU_MAX_LOOP_PER_SECOND);
 
        // Uncomment to tune CPU_MAX_LOOP_PER_SECOND value
        // Serial.println(delta);
    }
}

osSystickHandler()

void osSystickHandler

(

)

Definition at line 61 of file cpu_load.cpp.

{ cpuLoadCallback(); }

readCpuLoadPercent()

uint8_t readCpuLoadPercent

(

void

)

Get the value of the CPU load.

Returns

CPU load in percent

Note

If this raises to 100%, there is some blocking code somewhere

Definition at line 39 of file cpu_load.cpp.

{ return cpuLoadPercent; }

Variable Documentation

cpuLoadLatestCycleCount

uint32_t cpuLoadLatestCycleCount = 0

Definition at line 30 of file cpu_load.cpp.

cpuLoadPercent

volatile uint8_t cpuLoadPercent = 0

Definition at line 25 of file cpu_load.cpp.

cpuLoadTimeCount

uint16_t cpuLoadTimeCount = TIME_CPU_CYCLE_RESET

Definition at line 28 of file cpu_load.cpp.

idleCyclesCount

volatile uint32_t idleCyclesCount = 0

Access to idleCyclesCount needed by the COUNT_IDLE_CYCLE macro.

Definition at line 22 of file cpu_load.cpp.