stm32f407正交编码器初始化

2019-07-20 12:12发布

前几天调了一天编码器,一点反应都没有,放弃了。今天忽然想起没有加上拉电阻,加了两个就ok了。
顺便说一下,f407的编码器接口的配置和f103一模一样,唯一的不同就是f407的tim2和tim5是32位的,而103好像都是16位的。使用32位编码器的话,
在好多时候都可以不使用tim中断。直接读取cnt的值就可以了。


void ENC_Init(void)
{
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 
  TIM_ICInitTypeDef TIM_ICInitStructure; 
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
    
  //GPIO_StructInit(&GPIO_InitStructure);
  /* Configure PC.06,07 as encoder input */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  GPIO_PinAFConfig(GPIOC,GPIO_PinSource6,GPIO_AF_TIM3);
     GPIO_PinAFConfig(GPIOC,GPIO_PinSource7,GPIO_AF_TIM3);
  
  /* Enable the TIM3 Update Interrupt */
//  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
//  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
//  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
//  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//  NVIC_Init(&NVIC_InitStructure);
  
  /* Timer configuration in Encoder mode */
  //TIM_DeInit(TIM3);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0; // No prescaling
  TIM_TimeBaseStructure.TIM_Period = 60000;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
  
  TIM_EncoderInterfaceConfig(TIM3, TIM_EncoderMode_TI1, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
  TIM_ICStructInit(&TIM_ICInitStructure);
  TIM_ICInitStructure.TIM_ICFilter = 0;
  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  
  // Clear all pending interrupts
  TIM_ClearFlag(TIM3, TIM_FLAG_Update);
  TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
  //Reset counter
  //TIM2->CNT = 100;
  
  // ENC_Clear_Speed_Buffer();
  
  TIM_Cmd(TIM3, ENABLE);
}
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