stm32RBT6定时器3通道3是不是不能用TI2FP2触发

carpediem · 发表于 2017-8-15 13:19:56

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef  TIM_ICInitStructure;
TIM_DeInit(TIM3);
TIM_TimeBaseStructure.TIM_Period =65535;    //自动重装值
TIM_TimeBaseStructure.TIM_Prescaler =72;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;  //时钟分割为0
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;             //通道选择 PB0
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿触发
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;//管脚与寄存器对应关系
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;//输入预分频。比如选择4分频，则每四个输入周期才做一次捕获。
TIM_ICInitStructure.TIM_ICFilter = 0x0;    //滤波设置，经历几个周期跳变认定波形稳定0x0～0xF
TIM_ICInit(TIM3, &TIM_ICInitStructure);

TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2); //选择IC1为始终触发源    ******************
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);//TIM从模式：触发信号的上升沿重新初始化计数器和触发寄存器的更新事件
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable); //启动定时器的被动触发
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);

TIM_ITConfig(TIM3, TIM_IT_CC3, ENABLE);//打开中断使能CC1中断请求
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);//打开中断使能TIM3溢出中断请求
TIM_Cmd(TIM3, ENABLE);//启动TIM3
这样配置是不是不对啊