u16 capture=0; u16 CCR1_Val=1000; u16 CCR2_Val=5000; u16 CCR3_Val=10000; u16 CCR4_Val=20000;

       TIM_TimeBaseStructure.TIM_Period=65535; TIM_TimeBaseStructure.TIM_Prescaler=7200-1; TIM_TimeBaseStructure.TIM_ClockDivision=0x0; TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上计数 TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);

void TIM2_IRQHandler(void) { /*TIM2_CH1*/ if(TIM_GetITStatus(TIM2,TIM_IT_CC1)!=RESET) { TIM_ClearITPendingBit(TIM2,TIM_IT_CC1); /*PC.1引脚的翻转频率为  Hz*/ GPIO_WriteBit(GPIOC,GPIO_Pin_1,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_1))); capture=TIM_GetCapture1(TIM2); TIM_SetCompare1(TIM2,capture+CCR1_Val); //GPIO_ResetBits(GPIOC,GPIO_Pin_All); } /*TIM2_CH2*/ if(TIM_GetITStatus(TIM2,TIM_IT_CC2)!=RESET) { GPIO_WriteBit(GPIOC,GPIO_Pin_2,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_2))); TIM_ClearITPendingBit(TIM2,TIM_IT_CC2); capture=TIM_GetCapture2(TIM2); TIM_SetCompare2(TIM2,capture+CCR2_Val); //GPIO_SetBits(GPIOC,GPIO_Pin_All);  }
}

请问这个定时时间怎么算啊?