Library for dimmer application with SAMD21G18A (e.g. Arduino Zero/M0).

timer	channel	recommended pin	alternative pins
Timer0	0	2	A3
Timer0	1	5	A4
Timer0	2	6	10
Timer0	3	7	12
Timer1	0	4	1, 8
Timer1	1	3	0, 9
Timer2	0	6	11
Timer2	1	7	13

Listed pins are for Arduino Zero. On Arduino M0 (Pro) pins 2 and 4 are reversed!

ATTENTION:

if you change frequency or invert output, you should do it for all pins on same timer. E.g. if 11 is inverted, 13 must be inverted too!
Supported pwm pins (only one pin on the same channel is supported, e.g. 6)

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Create a PWM_SamD21 object and initialize it with your desired pwm settings

demo a fast pwm channel

PWM_SamD21 pwm38khz(2, 38000, false);
PWM_SamD21 pwm56khz(5, 56000, false);

set as non inverting

PWM_SamD21 pwmA(4, 1000, false);
PWM_SamD21 pwmB(3, 1000, false);

setup as inverting

PWM_SamD21 pwmC(11, 1000, true);
PWM_SamD21 pwmD(13, 1000, true);

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demonstrate different ways to set the duty cycle and control the output

set non-inverted channels, 1/4 duty cycle

pwmA.setValue(pwmA.getMaxValue() / 4);
pwmB.setDutyCycle(0.25);

set inverted channels, 3/4 duty cycle

pwmC.setValue(pwmC.getMaxValue() / 4);
pwmD.setDutyCycle(0.25);

set to 50 percent duty cycle

pwm38khz.setDutyCycle(0.50);
pwm56khz.setDutyCycle(0.50);

turn off the pwm channels

pwmA.setOff();
pwmD.setOff();