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problems about STM32F446 TIM2 as External counter

Question asked by liu.zhiyan on Apr 5, 2016
Latest reply on Apr 5, 2016 by FTITI.Walid
I'm using STM32F446RE NUCLEO and I need to count the external pulse.I don't know how to configurate it to enable the counter.the value of counter is 0 whatever the input fruquency.
the following code is my configuration function.Thanks for your helping!

void TIM2_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef   TIM_TimeBaseStructure;
    RCC_ClocksTypeDef RCC_ClockFreq;
    
GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOA,GPIO_PinSource0,GPIO_AF_TIM2);
    
    RCC_GetClocksFreq(&RCC_ClockFreq);

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    
   TIM_DeInit(TIM2);

   TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = 2;
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); // Time base configuration

TIM_ETRClockMode2Config(TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);

TIM_SetCounter(TIM2, 0);
TIM_Cmd(TIM2, ENABLE);
}

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