带霍尔的无刷直流电机

只看该作者 · 2013-4-26 20:12

网上看到这样一段例子：
void BLDC_TIM3Config(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;    //基本结构体变量定义
TIM_ICInitTypeDef  TIM_ICInitStructure;                   //定义结构体变量
TIM_OCInitTypeDef  TIM_OCInitStructure;                   //输出结构体变量定义

TIM_DeInit(TIM3);

TIM_TimeBaseStructure.TIM_Prescaler = 71;    //TIM基本初始化
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period =65535;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;          //选择通道1
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //输入上升沿捕获
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_TRC;  //配置通道为输入，并映射到哪里
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;    //输入捕获预分频值
TIM_ICInitStructure.TIM_ICFilter = 10;                   //输入滤波器带宽设置

TIM_ICInit(TIM3, &TIM_ICInitStructure);                   //输入通道配置

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;       //TIM输出通道初始化
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse =1023;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC2Init(TIM3,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;       //TIM输出通道初始化
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStructure.TIM_Pulse =65535;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC4Init(TIM3,&TIM_OCInitStructure);

TIM_SelectHallSensor(TIM3,ENABLE);                         //使能TIMx的霍尔传感器接口

TIM_SelectInputTrigger(TIM3, TIM_TS_TI1F_ED);             //输入触发源选择

TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);          //从模式选择

TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);//主从模式选择

TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_OC2Ref);    //选择输出触发模式(TRGO端)

TIM_ITConfig(TIM3, TIM_IT_Trigger|TIM_IT_CC4, ENABLE);    //开定时器中断
//TIM_Cmd(TIM3,ENABLE);
}
疑问：霍尔有三个接口，分别是hallA,B,C.接到单片机上去，采用了TIM3的channel1,2,3三个通道。为什么不是配置三个通道都是输入？却要仅配置channel1为输入，其他两个为输出呢？如果这样的话，怎么异或呢？这个刚接触这个，请大家见谅。。。