STM32-F401RE change duty cycle on the fly

[SMusc.1]

Hi every one; using a STM32-F401RE board , how can i canghe on the fly the period and duty cycle of the two signal got in complementary PWM death time using ARR and CCR register?

[SMusc.1]

Starting the timer in this way:

HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);

HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_1);

and using this call back:

void HAL_TIM_PeriodElapsedCallback (TIM_HandleTypeDef *htim)

doesn't work

[gbm]

Check if you have enabled the timer interrupt.