定时器TIM2使用ETR引脚进行脉冲计数问题

bjxjsh

定时器TIM2使用ETR引脚进行脉冲计数问题 [复制链接]

定时器2配置

void TIM2_Configuration(void)
{

TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;

TIM_BaseInitStructure.TIM_Period = 0XFFFF; //自动重装载的值
TIM_BaseInitStructure.TIM_Prescaler = 0; //计数器的时钟频率(CK_CNT)等于fCK_PSC/( PSC[15:0]+1)
TIM_BaseInitStructure.TIM_ClockDivision = 0;//时钟分频因子 288MHZ
TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_BaseInitStructure); // Time base configuration

TIM_ETRClockMode2Config(TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted, 0);

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

i

}

wjialin

主程序是这样写的
while (1)
{

for(i_Loop = 0; i_Loop < 100; i_Loop ++)
{
        GPIO_SetBits(GPIOB, GPIO_Pin_8);
        Delay();
   GPIO_ResetBits(GPIOB, GPIO_Pin_8);
        Delay();
}

n_Counter = TIM_GetCounter(TIM2);
i_Loop1=n_Counter;
i_Loop2=n_Counter>>8;
USART_SendData(USART2,i_Loop1);
   while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
     USART_SendData(USART2,i_Loop2);
   while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);

}