The rotation direction of DC/EC motor

Hello,

How can I manage the rotation direction of DC/EC motor with NRF52? 

This doesn't work:

#define DUTY (90)

while (true)
{
nrf_gpio_pin_write(SERVO_PIN1, 1);

app_pwm_channel_duty_set(&PWM12, 0, DUTY);
nrf_delay_ms(2000);

//Reverse Motor
nrf_gpio_pin_write(SERVO_PIN1, 0);

app_pwm_channel_duty_set(&PWM12, 0, DUTY);
nrf_delay_ms(2000);

}
}

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