STM32 variable duty cycle using ADC with complementary pwm

[Abdoulaye]

Hi all!

I am new on STM32 this is my first project on STM32CubeIDE. I want to generate variable duty cycle using ADC with complementary PWM. When I did the code for one channel PWM it works well and the duty cycle varies  but when I did it for the complementary PWM it does not work . Here is a picture of the code. What should I do to make it works for the complementary PWM? I will be grateful for your help.

while (1)

{

HAL_ADC_Start(&hadc1);

HAL_ADC_PollForConversion(&hadc1,HAL_MAX_DELAY);

pwm = HAL_ADC_GetValue(&hadc1);

duty = (pwm*899/4095);

HAL_Delay(1);

}

__HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1, duty);

HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_1);

HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1); //AH=H,S1

[Sarra.S]

Hello @Abdoulaye, welcome to ST Community, 

In your main loop, update the duty cycle for the complementary PWM signals

 HAL_ADC_Start(&hadc1);
    HAL_ADC_PollForConversion(&hadc1, HAL_MAX_DELAY);
    uint32_t pwm = HAL_ADC_GetValue(&hadc1);
    uint32_t duty = (pwm * 899 / 4095);

    __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1, duty);
    __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1N, duty); // Update complementary channel

 Also, enable dead-time insertion in your timer configuration.

[Michael E]

Hello @Abdoulaye ,

Could you please specify the reference of your STM32?
There are also several articles available on the wiki here that may help you.

Best Regards