TIM定时器的小细节探索，TIM的霍尔模式

Rhett28 · 发表于 2019-5-20 22:51:45

采用TIM的霍尔模式，只能捕获霍尔的变化，不能读取计数器的值。配置程序如下
static void HALL_TIMx_Configuration(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_ICInitTypeDef       TIM_ICInitStructure;
// TIM_OCInitTypeDef       TIM_OCInitStructure;

  /* 使能定时器时钟 */
  HALL_TIM_APBxClock_FUN(HALL_TIM_CLK,ENABLE);
  /* 定时器基本参数始终 */
  /* 定时周期: HALL_TIM_Period+1 */
  TIM_TimeBaseStructure.TIM_Period = HALL_TIM_PERIOD;
  /* 设置预分频：HALL_TIM_Prescaler,输出脉冲频率：72MHz/(HALL_TIM_Prescaler+1)/(HALL_TIM_Period+1) */
  TIM_TimeBaseStructure.TIM_Prescaler = HALL_TIM_PRESCALER;
  /* 设置时钟分频系数：不分频(这里用不到) */
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;
  /* 向上计数模式 */
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up ;
  TIM_TimeBaseInit(HALL_TIMx, &TIM_TimeBaseStructure);

  /* 初始化TIM5输入捕获参数 */
  /* CC1S=01 选择输入端 IC1映射到TI1上 */
TIM_ICInitStructure.TIM_Channel    = HALL_TIM_Channel_x;
  /* 上升沿捕获 */
TIM_ICInitStructure.TIM_ICPolarity  = TIM_ICPolarity_BothEdge;
  /* 映射到TI1上 */
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_TRC;
  /* 配置输入分频,不分频  */
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  /* IC1F=0000 配置输入滤波器不滤波 */
TIM_ICInitStructure.TIM_ICFilter = 0x00;
TIM_ICInit(HALL_TIMx, &TIM_ICInitStructure);
// TIM4->CCMR1
TIM4->CCER&=0xFFEF;
TIM4->CCMR1|=0x700;
TIM4->CCMR1&=0xFCFF;
//  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;       //TIM输出通道初始化 OC2M
//  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;       //CCR2
//  TIM_OCInitStructure.TIM_Pulse =0;
//  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
// TIM_OC2Init(HALL_TIMx,&TIM_OCInitStructure);//此处是OCx代表配置通道x
  /* 配置NVIC */
  HALL_TIMx_NVIC_Configuration();

  TIM_SelectHallSensor(HALL_TIMx,ENABLE);                         //使能TIMx的霍尔传感器接口
  TIM_SelectInputTrigger(HALL_TIMx, TIM_TS_TI1F_ED);                //输入触发源选择

TIM_SelectSlaveMode(HALL_TIMx, TIM_SlaveMode_Reset);          //从模式选择
  TIM_SelectMasterSlaveMode(HALL_TIMx, TIM_MasterSlaveMode_Enable); //主从模式选择
/* 允许更新中断 ,允许CC1IE捕获中断    */
  TIM_ITConfig(HALL_TIMx, TIM_IT_Trigger, ENABLE);
  /* 使能定时器 */
  TIM_Cmd(HALL_TIMx, ENABLE);
  TIM_ClearITPendingBit (HALL_TIMx,TIM_IT_Trigger);
}

Rhett28 · 发表于 2019-5-20 22:53:00

每一次霍尔值发生变化时都会触发定时器中断，但是读出定时器的计数值始终是1。

Rhett28 · 发表于 2019-5-20 22:53:41

中断处理
void HALL_TIM_IRQHANDLER(void)
{
// LED_turn();
/* 确保是否产生了EXTI Line中断 */
if ( TIM_GetITStatus ( HALL_TIMx, TIM_IT_Trigger ) != RESET ) //捕获中断
{
/* 清除中断标志位 */
bldc_dev.motor_speed_M_s_temp=TIM_GetCounter(HALL_TIMx);
// bldc_dev.motor_speed_M_s_temp=TIM4->CCR2;
TIM_ClearITPendingBit (HALL_TIMx,TIM_IT_Trigger);
HALL_Callback();
}
}