LL DRIVERS SET ONE PULSE MODE

[SKoal.1]

I'm trying to generate 3 pulses using the One pulse Mode on the TIM1 with the LL drivers. I'm using an STM32F401RE.

I only get one pulse regardless the value I set for the repetition counter. I have done lot of research on the internet but I couldn't find any solution.

I would appreciate some help. Thanks,

Following is the code for the timer initialization:

I have also activated the the required channel in my main code().

void TIM1_af_init(void){

// Enable clock access to APB1

LL_APB2_GRP1_EnableClock (LL_APB2_GRP1_PERIPH_TIM1);

// set Prescaler

LL_TIM_SetPrescaler (TIM1, 84-1);

// set counter mode

LL_TIM_SetCounterMode (TIM1, LL_TIM_COUNTERMODE_UP);

// set Autoreload

LL_TIM_SetAutoReload (TIM1, 1000-1); // 10 000 divide per 10 000 = 1

LL_TIM_EnableUpdateEvent (TIM1);

LL_TIM_SetOnePulseMode (TIM1, LL_TIM_ONEPULSEMODE_SINGLE);

LL_TIM_SetRepetitionCounter (TIM1, 2);

// Set timer 2 to OC mode

LL_TIM_OC_SetMode (TIM1, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_PWM1); // PWM2 to inverse the signal

// set the polarity

LL_TIM_OC_SetPolarity (TIM1, LL_TIM_CHANNEL_CH1, LL_TIM_OCPOLARITY_LOW);

//Set the Duty Cycle

LL_TIM_OC_SetCompareCH1(TIM1, 995-1);

// Set counter from 0

LL_TIM_SetCounter (TIM1, 0);

// Enable counter

LL_TIM_EnableCounter (TIM1);

//3- Enable clock access to PORTA

LL_AHB1_GRP1_EnableClock (LL_AHB1_GRP1_PERIPH_GPIOA);

//4- Set pin mode

LL_GPIO_SetPinMode (GPIOA, LL_GPIO_PIN_8, LL_GPIO_MODE_ALTERNATE);

//5- Set the alternate function

LL_GPIO_SetAFPin_8_15 (GPIOA, LL_GPIO_PIN_8, LL_GPIO_AF_1);

}

[waclawek.jan]

Set up pin in GP​IO first.

Note, that both PSC and RCR are preloaded.​

What does this do:

> ​LL_TIM_EnableUpdateEvent()

​?

JW​

[SKoal.1]

Hello,

Thank you for your response.

I'm new to this so excuse me if I ask basic questions.

The LL_TIM_EnableUpdateEvent() is supposed to enable the update event. But I don't know how to set it properly.

• Do you know how I can set it properly as it seems to be a solution to my problem ?

• Or do you know how I can set up EGR.UG ?

Also, what do you mean by " Set up pin in GPIO first " ?

• Should I move the following code at the top of my TIM1_af_init() ?

//3- Enable clock access to PORTA

LL_AHB1_GRP1_EnableClock (LL_AHB1_GRP1_PERIPH_GPIOA);

//4- Set pin mode

LL_GPIO_SetPinMode (GPIOA, LL_GPIO_PIN_8, LL_GPIO_MODE_ALTERNATE);

//5- Set the alternate function

LL_GPIO_SetAFPin_8_15 (GPIOA, LL_GPIO_PIN_8, LL_GPIO_AF_1);

Thank you, I appreciate your help