STM32定时器二溢出定时-希望帮忙看下哪里有问题

lyz3432 · 发表于 2013-5-16 14:11:54

             我想用stm32的定时器2向上加溢出，在main函数的里面查询TIM_GetFlagStatus(TIM2 , TIM_FLAG_Update)标志位这样的方式来是固定一个主循环的时间但是现在定时器不好用，谁来看看我这个有什么问题
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 | RCC_APB1Periph_USART3 | RCC_APB1Periph_TIM2, ENABLE);
// /* Enable the TIM2 gloabal Interrupt [允许TIM2全局中断]*/
// NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn ;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);
         TIM_DeInit(TIM2);

void Time2_Overflow_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_Period = 0xffff;
//TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //TIM_CKD_DIV2 ;
TIM_TimeBaseInit(TIM2 , &TIM_TimeBaseStructure);
TIM_ClearFlag(TIM2 , TIM_FLAG_Update);
TIM_ITConfig(TIM 2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2 , ENABLE);
}

         Time2_Overflow_Init();
                  while(TIM_GetFlagStatus(TIM2 , TIM_FLAG_Update) == 1)
{
//TIM_SetAutoreload(TIM2,0);
TIM_ClearFlag(TIM2 , TIM_FLAG_Update);
}