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void TIM4_Base_Init()
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //ʱÖÓʹÄÜ

TIM_TimeBaseStructure.TIM_Period = 3;  //ÖØ×°Öµ£¬Ä¬ÈÏ
TIM_TimeBaseStructure.TIM_Prescaler =60; //·ÖƵϵÊý£¬72M/72=1MHz,ÆäËûÒÀ´ËÀàÍÆ  
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //ÉèÖÃʱÖÓ·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòÉϼÆÊýģʽ
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);     //°ÑÉÏÊöÊýֵдÈë¶ÔÓ¦¼Ä´æÆ÷
 
TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);            //ʹÄÜ»òÕßʧÄÜÖ¸¶¨µÄTIMÖжÏ

NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;            //TIM3ÖжÏ
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //ÏÈÕ¼ÓÅÏȼ¶0¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //´ÓÓÅÏȼ¶3¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQͨµÀ±»Ê¹ÄÜ
NVIC_Init(&NVIC_InitStructure);                 //°ÑÉÏÊöÊýֵдÈë¶ÔÓ¦¼Ä´æ

TIM_Cmd(TIM4, ENABLE);  //ʹÄÜTIMxÍâÉè
 
}
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