测试文章

CNT,Counter

计数器,自动递增,可配置时钟源和预分频来控制递增速度

PSC,Prescaler

预分频器,降低输入时钟频率,可调整CNT递增速度

ARR,Auto-reload Register

自动重载REG(周期寄存器),
决定计数周期长度,CNT==ARR时,TIM清0,产生更新事件

CCR,Capture/Compare Register

捕获/比较REG,有多个,用于输入捕获,
输出比较,PWM生成等,当CNT==CCR,触发中断或其他

TRGO:Trigger Output

触发输出,表示输出触发事件,条件满足时产生,
输出到指定引脚,可以触发外设或模块,如触发ADC转换,DAC输出

TRGI:Trigger Input

触发输入,当外部事件触发到TRGI引脚,TIM可以根据该信号,
执行特定操作,如重载计数器,启动TIM,进行捕获

点击查看代码

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	TIM_InternalClockConfig(TIM3);
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_Period = 65536 - 1;		//ARR
	TIM_TimeBaseInitStructure.TIM_Prescaler = 72 - 1;		//PSC
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);
	
	TIM_ICInitTypeDef TIM_ICInitStructure;
	TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
	TIM_ICInitStructure.TIM_ICFilter = 0xF;
	TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
	TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
	TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
	TIM_ICInit(TIM3, &TIM_ICInitStructure);
	
	TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1);
	TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
	
	TIM_Cmd(TIM3, ENABLE);