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STM32F0 timer interrupt frequency speed droping

Question asked by emre ozdemir on Dec 14, 2016
Latest reply on Dec 15, 2016 by emre ozdemir

Hello everybody 

I am using stm32f030F4 in my project and  i need a timer with frequency 200kHz

I set timer1 for this frequency and  toggled a pin in timer callback function  and watch with oscilloscope 

i can see a signal with frequency 100kHz this is ok so far but when i made some additional operations like toggle another pin the interrupt frequency speed droping about 4kHz if i add one more toggling  it is dropping about 40kHz 


And i tried to make it with flag and do the operations in while loop but it is also droping so i cant make the system work stable.


i am using stmcubemx to create project and i set timer and others clock 48 MHz 

my timer configuration is like that:


htim1.Instance = TIM1;
htim1.Init.Prescaler = 0;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 239;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;


I really need your helps.

Maybe i am missing somewhere because when i look datasheet i see it need to work.


thanks for your helps