关于TIM4定时器测速问题

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楼主

奔跑的猫ちゃん|

楼主 | 2020-4-25 13:36 | 只看该作者回帖奖励

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TI, 定时器, pi, IO, ST

我用的是stm32f03C8T6最小系统板
GPIO_InitTypeDef    GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_ICInitTypeDef    TIM_ICInitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  TIM_TimeBaseStructure.TIM_Period = 0xffff;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up ;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
//编码器模式设置
  TIM_EncoderInterfaceConfig(TIM4, TIM_EncoderMode_TI12,TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
  TIM_ICStructInit(&TIM_ICInitStructure);
  TIM_ICInitStructure.TIM_ICFilter = 6;
  TIM_ICInit(TIM4, &TIM_ICInitStructure);

TIM_SetCounter(TIM4, 0x7fff);
  TIM_ClearFlag(TIM4, TIM_FLAG_Update);
  TIM_Cmd(TIM4, ENABLE);

主函数
Velocity_L=TIM_GetCounter(TIM4) - 0x7fff;

为什么TIM4没有用,TIM3和TIM2就可以？？？？？这是什么原因啊？？？

使用特权