PWM Library Randomly Changing Polarity

[StudioNeat]

I have noticed the PWM library in SDK v 8.1 randomly changes polarity of the PWM channels. I can't figure out what causes it to happen... seem's random, but I doubt it.

I am almost constantly changing the duty cycle with the code below:

void pwm_ready_callback1(uint32_t pwm_id) // PWM callback function { ready_flag1 = true; }

void pwm_ready_callback2(uint32_t pwm_id) // PWM callback function { ready_flag2 = true; }

void setPWMVals( uint8_t valX, uint8_t valY ) { …

	ready_flag1 = false; 
	while (!ready_flag1) {
	    APP_ERROR_CHECK(app_pwm_channel_duty_set(&PWM1, 0, valX));
 }


    ready_flag2 = false;
    while (!ready_flag2) {
        APP_ERROR_CHECK(app_pwm_channel_duty_set_hires(&PWM2, 0, valY));
    }
…

}

I've also tried the other way to set the duty:

while (app_pwm_channel_duty_set(&PWM1, 0, value) == NRF_ERROR_BUSY);

But same result.

I imagine it has to do with when I set the duty, but I don't know why it would change the polarity...

Any ideas?

Thanks, Tom

[Radoslaw Koppel]

Please see the fresh answer in this thread: sometimes PWM signal is reversed