comp2输出到定时器捕获测脉宽

只看该作者 · 2013-12-2 17:51

比较器设置
RCC_APB1PeriphClockCmd(RCC_APB1Periph_COMP, ENABLE);
COMP_InitStructure.COMP_InvertingInput = COMP_InvertingInput_1_4VREFINT; //dac1 or pb3
COMP_InitStructure.COMP_OutputSelect = COMP_OutputSelect_TIM2IC4; //比较器输出映射到IC4
COMP_InitStructure.COMP_Speed = COMP_Speed_Fast;
COMP_Init(&COMP_InitStructure);
定时器2设置
// 2 初始化TIM2参数
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;         // TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

//TIM_ARRPreloadConfig(TIM2 , ENABLE);
//TIM_SelectOutputTrigger(TIM2 , TIM_TRGOSource_Update);

// 3 初始化TIM2输入捕获通道
//RI input capture register (RI_ICR)缺省是0，所以The standard AFs dedicated to
//TIM2 are:PE12 or PB11
//see page 341 of reference manual, PB11-->TIMx_CHx-->TIx-->处理-->ICx
TIM_ICInitStructure.TIM_Channel = TIM_Channel_4; //去配置TI4/IC4 每个TIM都有IC1~4
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_BothEdge;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;    //选择输入端  IC4映射到 TI4上
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;          //配置输入分频,不分频
TIM_ICInitStructure.TIM_ICFilter = 0x00;       //配置输入滤波器不滤波
TIM_ICInit(TIM2, &TIM_ICInitStructure);

//初始化NVIC 中断优先级分组
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;    //先占优先级2 级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;       // 1 //从优先级0 级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM_ITConfig( TIM2,
//TIM_IT_Update |
TIM_IT_CC4,ENABLE
);
TIM_Cmd(TIM2,ENABLE );
不知那里错误， TIM2捕获不到比较器输出的信号，我已将比较器设置成映射到TIM2 IC4

只看该作者 · 2013-12-3 15:12

没有人做个类似的问题吗？

1万 · 2013-12-3 18:03

我好象遇到过类似的问题, 设定中断, 并要有软件中断服务才行.

只看该作者 · 2013-12-4 09:47

捕获中断和溢出中断要区分

只看该作者 · 2013-12-5 09:20

定时器中断是有的，就是进不去，用外接中断信号是OK的，就是用比较器的输出信号不行
void TIM2_IRQHandler(void)
{
static uint16_t cnt=0;
uint32_t value;

if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM2 , TIM_IT_Update);
GPIO_ToggleBits(GPIOB, GPIO_Pin_6);
}

if (TIM_GetITStatus(TIM2, TIM_IT_CC4) != RESET)
{
TIMCH_CAPTURE_VAL=TIM_GetCapture4(TIM2);
TIM_ClearITPendingBit(TIM2, TIM_IT_CC4);
}
}