stm32F103ZET6 TIM1 输入捕获问题？

axlinux · 发表于 2020-11-20 10:30:38

hi
以下是我使用TIM1 CH4 配置输入捕获功能，计算输入波形高电平持续的时间，不确定是哪里有问题，我还尝试了TIM1的其他通道，TIM1始终捕获不到高电平，仿真调试发现根本没有进入中断，我的配置哪里有问题？请帮我分析下，不胜感激！
可以确认输入信号是没有问题的，我使用 TIM4_CH1  PB6，TIM2_CH2  PA1，TIM5_CH1 PA0均是可以的。

timer1Ch4CaptureInit(0XFFFF,72-1);//配置TIM1以1Mhz的频率计数

配置函数
//RR ENC: TIM1_CH4 PA11
void timer1Ch4CaptureInit(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_11);
//初始化定时器1
TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值
TIM_TimeBaseStructure.TIM_Prescaler =psc;  //预分频器
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
//初始化TIM1输入捕获参数
TIM1_ICInitStructure.TIM_Channel = TIM_Channel_4; //CC1S=01  选择输入端 IC1映射到TI1上
TIM1_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
TIM1_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM1_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;  //配置输入分频,不分频
TIM1_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM1, &TIM1_ICInitStructure);
//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;  //TIM1中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级0级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
TIM_ITConfig(TIM1,TIM_IT_Update|TIM_IT_CC4,ENABLE);//允许更新中断 ,允许CC1IE捕获中断
TIM_Cmd(TIM1,ENABLE);  //使能定时器1
}

//定时器1中断服务程序
void TIM1_CC_IRQnHandler(void)
{
  if((TIM1CH4_CAPTURE_STA&0X80)==0)//还未成功捕获
{
  if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)

  {
if(TIM1CH4_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM1CH4_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
   TIM1CH4_CAPTURE_STA|=0X80;//标记成功捕获了一次(高电平)
   TIM1CH4_CAPTURE_VAL=0XFFFF;
}else TIM1CH4_CAPTURE_STA++;
}else{
rrHighPeriod = 0;
}
  }
if (TIM_GetITStatus(TIM1, TIM_IT_CC4) != RESET)//捕获1发生捕获事件
  {
if(TIM1CH4_CAPTURE_STA&0X40)  //捕获到一个下降沿
{
TIM1CH4_CAPTURE_STA|=0X80;  //标记成功捕获到一次上升沿(高电平)
TIM1CH4_CAPTURE_VAL=TIM_GetCapture1(TIM1);
   TIM_OC4PolarityConfig(TIM1,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获
}else       //还未开始,第一次捕获上升沿
{
TIM1CH4_CAPTURE_STA=0; //清空
TIM1CH4_CAPTURE_VAL=0;
   TIM_SetCounter(TIM1,0);
TIM1CH4_CAPTURE_STA|=0X40;  //标记捕获到了上升沿
   TIM_OC4PolarityConfig(TIM1,TIM_ICPolarity_Falling);  //CC1P=1 设置为下降沿捕获
}
  }
  }
TIM_ClearITPendingBit(TIM1, TIM_IT_CC4|TIM_IT_Update); //清除中断标志位
}

//高电平时间计算
if(TIM1CH4_CAPTURE_STA&0X80)
  {
rrHighPeriod=TIM1CH4_CAPTURE_STA&0X3F;
rrHighPeriod*=65536;//溢出时间总和
rrHighPeriod+=TIM1CH4_CAPTURE_VAL;//得到总的高电平时间
printf("HIGH:%d us\r\n",rrHighPeriod);//打印总的高点平时间
TIM1CH4_CAPTURE_STA=0;//开启下一次捕获
  }