External Input Counter and External interrupt

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External Input Counter and External interrupt : count the input signal from the button. 

So what is the different between two methods ?

While external interrupt needs to jump into the interrupt routine to do the increment or decrement of a variable,

counter can handle the job nicely without jumping anywhere with External Input Counter.

Therefore, it will be obviously useful when your program has many types of interrupt running. 

HAL_TIM_Base_Start(&htim2);    //Start TIM2 without interrupt

while (1)
{
  count = __HAL_TIM_GetCounter(&htim2);    //read TIM2 counter value
}

External Input Counter and External interrupt

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原文地址：http://www.cnblogs.com/shangdawei/p/4761801.html