Hi, I'm using 32L152CDISCOVERY to generate PWM. I try to change the PWM from 78% -> 50% -> 78% -> 50% in loop.There is something wrong while generating PWM. If PWM is not changed on fly, the set value is OK. BR, Tomi

[TLuom.1]

Code found in the main.c and figure of the issue seen in PWM_scope_NOK.png.

[TDK]

  /* Infinite loop */
  while (1)
  {
	  for (int j=0; j<2; j++)
	  {
		  TIM3->CCR1 = duty_values[j];
	  }
  }

Your code doesn't wait for an update or anything, it just continuously changes the duty cycle between two values.

If you want to alternate between 50% and 78%, you'll need to change CCR1 in a timer update interrupt, or something similar.