使用定时器1计时时间不对

z2500053109

我使用TIM1定时器定时 ，设定每30ms进一次中断 仿真没问题 可实际在实验板上运行起来大概一秒才进一次数据 下面是程序 大家帮忙看看

[mw_shl_code=c,true]void TIM1_Int_Init(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //时钟使能 //定时器TIM3初始化 TIM_TimeBaseStructure.TIM_Period = 719; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 TIM_TimeBaseStructure.TIM_Prescaler =2999; //设置用来作为TIMx时钟频率除数的预分频值 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位 TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断 //中断优先级NVIC设置 NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; //TIM5中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级0级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //从优先级3级 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能 NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器 TIM_Cmd(TIM1, ENABLE); //使能TIMx } u16 testnum=0; void TIM1_UP_IRQHandler(void) //TIM1中断 { if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //检查TIM1更新中断发生与否 { // get_ad(); testnum ++; TIM_ClearITPendingBit(TIM1, TIM_IT_Update ); //清除TIMx更新中断标志 } }[/mw_shl_code]

lionmon

帮顶。换成定时器3试试