uint32_t pwmPin = 9;    // use Digital pin D9
 
int cycle = 9;                      // Divide output into 9+1 = 10 portions
int sourceClock = PWM_SOURCE_CLOCK_13MHZ;   //
int divider = PWM_CLOCK_DIV8;       // The PWM frequency will be 13MHz / 8 / 10 = 162.5KHz
 
int duty = 0;
int offset = 1;
 
void setup()
{
    pinMode(pwmPin, OUTPUT);
}
 
void loop()
{
    analogWriteAdvance(pwmPin, sourceClock, divider, cycle, duty);
 
    duty += offset;
    if (duty == cycle)
    {
        offset = -1;
    }
    else if(duty == 0)
    {
        offset = 1;
    }
    delay(1000);
}