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标题: STM32定时器的计数器模式 [打印本页]

作者: 我是MT 时间: 2014-5-30 17:43 标题: STM32定时器的计数器模式

调试了2天终于把STM32定时器的计数器模式调试出来了,从PA7,TIM3_CH2输入100个方波后产生一个TIM3, TIM_IT_CC2的中断,

      GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      //TIM3输出初始化
      TIM_DeInit(TIM3);             //TIM3       ch2       pin17       pa7
      TIM_TimeBaseStructure.TIM_Period = 99;             //计数值=100-1
      TIM_TimeBaseStructure.TIM_Prescaler = 0;             //预分频
      TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;             //时钟分割
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down;       //模式
      TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);             //基本初始化

      TIM_SetCounter(TIM3, 99);                               //设置 TIM3 计数器寄存器值
      TIM_ARRPreloadConfig(TIM3, ENABLE);             //设置 TIMx 自动重装载寄存器值
      TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
      TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_External1);

      //TIM3通道的捕捉初始化
      TIM_SetCompare2(TIM3, 99);
      TIM_Cmd(TIM3, state);             //启动TIM3
      TIM_ClearFlag(TIM3, TIM_IT_CC2);
      TIM_ITConfig(TIM3, TIM_IT_CC2, state);             //打开中断

      NVIC_InitTypeDef NVIC_InitStructure;
      NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;             //
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;       //抢占优先级0
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;             //响应优先级0
      NVIC_InitStructure.NVIC_IRQChannelCmd = state;             //允许中断
      NVIC_Init(&NVIC_InitStructure);                //写入设置

void TIM3_IRQHandler(void)
{
      TIM_ClearFlag(TIM3, TIM_IT_CC2);
}

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