This sketch is a simple way to execute functions at different time intervals.
class Timer
{
private:
unsigned long lastTime; // the latest time had doing Func( )
void (*Func) (void);
void (*backupFunc) (void); // backup Func for start( )
unsigned long T_int; // interval in ms, can be set as in us (optional)
public:
Timer(void (*userFunc)(), unsigned long T, bool isTinUs = false)
{
Func = backupFunc = userFunc; // save the function pointer
T_int = T * 1000;
if (isTinUs)
T_int = T; // T is in micro second as per unit
lastTime = 0; // initialization should be in constructor
}
void check()
{
if ( Func == 0 )
return; // no function pointer
unsigned long _micros = micros(); // Local variable could be in Register
if (_micros - lastTime >= T_int)
{
lastTime = _micros; // latest time doing Func( )
Func();
}
}// check
void start( ) // first run of doing Func( )
{
if (Func == 0)
Func = backupFunc; // restore after .stop( )
lastTime = micros(); // latest time doing Func( )
Func(); // First run
} // start
void stop( ) // stop the scheduled Func (userFunc)
{
Func = 0; // set as NULL
} // stop
#define _MS_ false /*Milliseconds*/
#define _US_ true /*Microseconds*/
};
Timer T1(Blink1, 88000, _US_); // 88000us (NOT ms)
Timer T2(Blink2, 1000); // 1000ms
Timer T3(Blink3, 2000); // 2000ms
void setup()
{
// put your setup code here, to run once:
pinMode(13, OUTPUT);
pinMode(11, OUTPUT);
pinMode(9, OUTPUT);
T1.start() ; // optional to use the .start( ) function
delay(2568); // On Purpose for you to compare T1 vs. T2, T3
}
void loop()
{
// put your main code here, to run repeatedly:
T1.check();
T2.check();
T3.check();
}
void Blink1()
{
digitalWrite(13, !digitalRead(13));
}
void Blink2()
{
digitalWrite(9, !digitalRead(9));
}
void Blink3()
{
digitalWrite(11, !digitalRead(11));
}