STM32F4 PWM

Posted on December 05, 2014 at 19:08

Hello,

I'm trying to change the  duty cycle of TIM1 in PWM Mode, but somehow my code is not working.

void TIM1_CC_IRQHandler(void)

{

  HAL_NVIC_ClearPendingIRQ(TIM1_CC_IRQn);

  HAL_TIM_IRQHandler(&htim1);

    cx++;

    if (cx>450)

    {

        cx=0;

    }

    TIM1->CCR1=cx;

    TIM1->CCR2=cx;

    TIM1->CCR3=cx;

}

If I remove the lines

    TIM1->CCR1=cx;

    TIM1->CCR2=cx;

    TIM1->CCR3=cx;

the code works fine, but without changing the duty cycle of course.

How can I change the duty cycle on the fly?

Thanks