Pwm one cycle output

[giwonKIM]

Hello, I'm using STM32F030C8 and I have created 4 PWM waveforms.

I want to create PWM and stop it after one cycle.

I'm thinking of how to create PWM and stop directly after one cycle.

Is there any other way?

Thank you.

[waclawek.jan]

JW

[giwonKIM]

Hi,

htim5.Instance->CR1 |= (1 << 3);

HAL_TIM_PWM_Start(&htim5, TIM_CHANNEL_1);

I wrote the code like this, but it doesn't work. -> The signal will remain at the High level only.

Do you happen to have an example code?

[giwonKIM]

I'm changing pwm mode and opm mode using external buttons.

When entering opm mode, keep high level and generate pulse. I want to keep low level and generate pulse.

 

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
	switch(GPIO_Pin)
	{
		case GPIO_PIN_13 :
		{
	        if (opm_mode)
	        {
	        	StartPWM();

	            opm_mode = 0;
	        }
	        else
	        {
	        	StartOPM();

	 
	        }
		}
	}

}

void StartPWM(void)
{
    HAL_TIM_PWM_Stop(&htim5, TIM_CHANNEL_1); // ???��머�?? 먼�? 중�?
    htim5.Instance->CR1 &= ~TIM_CR1_OPM;  // OPM 비트�??? ?��리어?��?�� 반복 모드 ?��?��
    if (HAL_TIM_Base_Init(&htim5) != HAL_OK)
    {
        Error_Handler();
    }
    if (HAL_TIM_PWM_Start(&htim5, TIM_CHANNEL_1) != HAL_OK)
    {
        Error_Handler();
    }
}

void StartOPM(void)
{
    HAL_TIM_PWM_Stop(&htim5, TIM_CHANNEL_1); // ???��머�?? 먼�? 중�?
    htim5.Instance->CR1 |= (1 << 3);  // OPM 비트�??? ?��?��?��?�� ?��?�� ?��?�� 모드 ?��?��
    if (HAL_TIM_Base_Init(&htim5) != HAL_OK)
    {
        Error_Handler();
    }
    if (HAL_TIM_PWM_Start(&htim5, TIM_CHANNEL_1) != HAL_OK)
    {
        Error_Handler();
    }
}

[waclawek.jan]

> I want to keep low level

Then you have either use the other PWM mode, or invert the output signal using TIMx_CCER.CCxP.

You may need to change also TIMx_ARR and TIMx_CCRx between the PWM and one-pulse mode to fit your expected output waveform.

JW