TIM1 ETR中断

QFLN · 发表于 2014-4-22 17:02:43

原子哥：您好！
帮指点下TIM1 ETR计数，计满150脉冲（脉冲频率500Hz）进入中断，只要执行下面代码，程序就死机。

[mw_shl_code=c,true]void t1init(void) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; //Config PA12 为浮空输入 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_Init(GPIOA, &GPIO_InitStructure); RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //时钟使能 TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_Period = 149; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);// Time base configuration TIM_ETRClockMode2Config(TIM1, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0); TIM_SetCounter(TIM1, 0); //中断优先级NVIC设置 NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; //TIM1中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //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_ITConfig(TIM1,TIM_IT_Update,ENABLE); //使能指定的TIM1中断,允许更新中断 TIM_Cmd(TIM1, ENABLE); } void TIM1_IRQHandler(void) //TIM1中断 { TIM1->SR=0; TIM1->CR1 |= 0x01; amm++; if(amm==10)amm=0; if(amm>5) { GPIO_SetBits(GPIOD,GPIO_Pin_All); GPIO_SetBits(GPIOB,GPIO_Pin_All); } else { GPIO_ResetBits(GPIOD,GPIO_Pin_0); GPIO_ResetBits(GPIOB,GPIO_Pin_0); } }[/mw_shl_code]