RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE);
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 , ENABLE);
TIM_DeInit(TIM2);
//TIM_DeInit(TIM3);
TIM_TimeBaseStructure.TIM_Period=50; /* 自动重装载寄存器周期的值(计数值) */
/* 累计 TIM_Period个频率后产生一个更新或者中断 */
TIM_TimeBaseStructure.TIM_Prescaler= (1000 - 1); /* 时钟预分频数 例如：时钟频率=72MHZ/(时钟预分频+1) */
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; /* 采样分频 */
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; /* 向上计数模式 */
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ClearFlag(TIM2, TIM_FLAG_Update); /* 清除溢出中断标志 */
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM2, ENABLE); /* 开启时钟 */
void TIM2_IRQHandler(void)
{
static uint8_t Display;
if ( TIM_GetITStatus(TIM2 , TIM_IT_Update) != RESET )
{
TIM_ClearITPendingBit(TIM2 , TIM_FLAG_Update);
seven_led(12);
if (runflag!=0)
keydown=keydown+1;
if (keydown>700) //16s
{runflag=0;
}
}
}
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