STM32F4 PWM

lk1991 · ‎2014-12-05

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

Tesla DeLorean · ‎2014-12-05

Posted on December 05, 2014 at 19:21

Depends if you have it in immediate load mode, I'd probably opt to update them in the Update interrupt so you aren't trying to chase the edge as it advances.

HAL stuff, really can't help you with that. Ive posted some Servo PWM and other PWM examples using the Standard Peripheral Library to the forum.

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Amel NASRI · ‎2014-12-10

Posted on December 10, 2014 at 12:18

Hi Lucas,

Please refer to

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Change%20CCR1%20value%20with%20HAL

where similar question was asked.

-Mayla-

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