I'm using STM32F407VG. I created a 28 khz square wave by using Timer PWM Generation. When i look at the oscilloscope, i can see it clearly. I'm having a trouble to change frequency of PWM without stopping it.
I found two functions which are __HAL_TIM_SET_PRESCALER() and __HAL_TIM_SET_AUTORELOAD().
HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1); __HAL_TIM_SET_AUTORELOAD(&htim2,99); __HAL_TIM_SET_PRESCALER(&htim2,29);
I set prescaler and autoreload in cubemx. Prescaler is 2 and ARR is 999 but i want change prescaler to 29 and arr to 99. I can see square wave with HAL_TIM_PWM_Start() but when i added other 2 functions.It goes away. I commented those prescaler and arr functions and i saw that PWM was working.
I dont not know how to change prescaler and arr values without stopping the PWM.