寄存器溢出问题

1万 · 2020-1-1 11:46

以前是测试固定频率，没考虑溢出问题，运行良好，

现在偶尔会有低频，所以得兼顾，但是加入更新中断后，频繁进入中断，是哪里出问题了？

1万 · 2020-1-1 11:49

楼主详细说说怎么回事啊，这么说太笼统了

1万 · 2020-1-1 11:54

输入捕获从模式复位，更新中断进行计数累加，记录溢出。

1万 · 2020-1-1 12:01

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2020-1-1 12:04

static void TIM2_Mode_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef  TIM_ICInitStructure;
TIM_DeInit(TIM2);

/* Time base configuration */

TIM_TimeBaseStructure.TIM_Period = 0xffff;
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;

TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV4;
//选择输入比较滤波器 0x0 - 0xF
TIM_ICInitStructure.TIM_ICFilter = 0x8;  //0x8

TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);

/* Select the TIM3 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);

/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);

/* Enable the Master/Slave Mode */
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);

/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM2, TIM_IT_Update|TIM_IT_CC2, ENABLE);

/* TIM enable counter */
TIM_Cmd(TIM2, ENABLE);
}

void TIM2_ISR(void)
{
Uint32 IC2Value;

      if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
      {
            TIM_ClearITPendingBit(TIM2, TIM_IT_Update);  //清除溢出中断标志位
            cnt_TIM2_IT_Update ++;
      }

      if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)
      {
            IC2Value = TIM_GetCapture2(TIM2);
            TIM_ClearITPendingBit(TIM2, TIM_IT_CC2); //清除捕获中断标志位

            IC2Value += (cnt_TIM2_IT_Update * 0xFFFF);
            cnt_TIM2_IT_Update = 0;  //清零
      }
}