Break / PWM - STM32F4

finnb2 · ‎2012-09-27

Posted on September 27, 2012 at 10:30

Hi Folks,

I like to disable PWM, on an external event - i want to use BKIN.

i set the break mechanism up like this

------

......

GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_TIM1);

/* Automatic Output enable, Break, dead time and lock configuration*/

TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;

TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSRState_Enable;

TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;

TIM_BDTRInitStructure.TIM_DeadTime = 30;

TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;

TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;

TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;

TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

....

PWM works, but when i activate PB.12, nothing happens... i expect PWM to stop ... .

any hints ??

/Finn

#pwm #cross-posted

Tesla DeLorean · ‎2012-09-27

Posted on September 27, 2012 at 17:07

TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSRState_Enable; // OSSI not OSSR

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finnb2 · ‎2012-09-27

Posted on September 27, 2012 at 18:37

Hi all, problem solved,

BKIN pin must be set to GPIO_Mode_AF.....

Thanks