PWMClass

A class to be called on interrupts to manage a template PWM signal.
Every 256 calls the PWM signal completes one cycle.
The timer on the interrupt should be defined by the desired period / 256.

Usage

• Add a #Include PWMClass.h to the headers
• Create a class variable on initialization, giving the duty cycle (uint_8 [range 0-255], template OutputPin)
• On each interrupt cycle call the functor PWM()
• The period of the signal will be determined by 1/256 * the timer of the interrupt

#include "PWMClass.h"

int main()
{
    PWM<int> PWM(75, 0); /** int for a sample template type ; 75 = dutycycle ; 0 = pin to change */
    int pulse = 0;

    for (int i = 0; i < 255*2 ; ++i) { /** Execute for 2 cycles */

        pulse = PWM();
        
        std::cout << "i= " << i << " output = " << pulse << std::endl; /** Output PWM */
    }

    std::cin.get(); 
    return 0; 

}

UnitTesting

The class is tested by the Google unit test library Two main tests:

• Duty cycle read and wright

• Output PWM capability on two factos:

• Total time on for X number of cycles

• Total times switched from 0 to 1 on X number of cycles

To run the test open PWMGenerator.sln and compile/run the project