关于TI3FP3,TI4FP4的问题的另类修正

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lixun00|

楼主 | 2008-12-6 18:15 | 只看该作者回帖奖励

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TI, ic, ST, struct, ni

查看TIM_PWMIConfig的代码:
if (TIM_ICInitStruct->TIM_Channel == TIM_Channel_1)
  {
    ...
  }
  else if (TIM_ICInitStruct->TIM_Channel == TIM_Channel_2)
  {
    ...
  }

只有Tim_Channl_1,2,没有3,4,查看了相关代码和寄存器
1,2只是是设置CCMR1,而要3,4是要设置CCMR2
由于相关寄存器的高度对称性,因此只要添加如下代码:
else if (TIM_ICInitStruct->TIM_Channel == TIM_Channel_3)
  {
     /* TI1 Configuration */
    TI3_Config(TIMx, TIM_ICInitStruct->TIM_ICPolarity, TIM_ICInitStruct->TIM_ICSelection,
               TIM_ICInitStruct->TIM_ICFilter);

    /* Set the Input Capture Prescaler value */
    TIM_SetIC1Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);

    /* TI2 Configuration */
    TI4_Config(TIMx, icoppositepolarity, icoppositeselection, TIM_ICInitStruct->TIM_ICFilter);

    /* Set the Input Capture Prescaler value */
    TIM_SetIC2Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
  }
  else if (TIM_ICInitStruct->TIM_Channel == TIM_Channel_4)
  {
    /* TI2 Configuration */
    TI4_Config(TIMx, TIM_ICInitStruct->TIM_ICPolarity, TIM_ICInitStruct->TIM_ICSelection,
               TIM_ICInitStruct->TIM_ICFilter);

    /* Set the Input Capture Prescaler value */
    TIM_SetIC4Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);

    /* TI1 Configuration */
    TI3_Config(TIMx, icoppositepolarity, icoppositeselection, TIM_ICInitStruct->TIM_ICFilter);

    /* Set the Input Capture Prescaler value */
    TIM_SetIC1Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
  }

就可实现TI3FP3(对应TI1FP1),TI4FP4(对应TI2FP2)

使用特权