STM32中输出比较TIM1与其他TIMx的不同之处

只看该作者 · 2009-10-12 11:12

这是一段MDK目录下的示例代码：

  /* ---------------------------------------------------------------
TIM2 Configuration: Output Compare Toggle Mode:
TIM2CLK = 36 MHz, Prescaler = 0x2, TIM2 counter clock = 12 MHz
CC1 update rate = TIM2 counter clock / CCR1_Val = 366.2 Hz
CC2 update rate = TIM2 counter clock / CCR2_Val = 732.4 Hz
CC3 update rate = TIM2 counter clock / CCR3_Val = 1464.8 Hz
CC4 update rate = TIM2 counter clock / CCR4_Val =  2929.6 Hz
  --------------------------------------------------------------- */
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 65535;
  TIM_TimeBaseStructure.TIM_Prescaler = 2;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  /* Output Compare Toggle Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC1Init(TIM2, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);
  /* Output Compare Toggle Mode configuration: Channel2 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
  TIM_OC2Init(TIM2, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);
  /* Output Compare Toggle Mode configuration: Channel3 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
  TIM_OC3Init(TIM2, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);
  /* Output Compare Toggle Mode configuration: Channel4 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
  TIM_OC4Init(TIM2, &TIM_OCInitStructure);
  TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Disable);
  /* TIM enable counter */
  TIM_Cmd(TIM2, ENABLE);
  /* TIM IT enable */
  TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);

/*******************************************************************************
* Function Name  : TIM2_IRQHandler
* Description : This function handles TIM2 global interrupt request.
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/
void TIM2_IRQHandler(void)
{
  /* TIM2_CH1 toggling with frequency = 183.1 Hz */
  if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
  {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1 );
capture = TIM_GetCapture1(TIM2);
TIM_SetCompare1(TIM2, capture + CCR1_Val );
  }
  /* TIM2_CH2 toggling with frequency = 366.2 Hz */
  if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)
  {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);
capture = TIM_GetCapture2(TIM2);
TIM_SetCompare2(TIM2, capture + CCR2_Val);
  }
  /* TIM2_CH3 toggling with frequency = 732.4 Hz */
  if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)
  {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);
capture = TIM_GetCapture3(TIM2);
TIM_SetCompare3(TIM2, capture + CCR3_Val);
  }
  /* TIM2_CH4 toggling with frequency = 1464.8 Hz */
  if (TIM_GetITStatus(TIM2, TIM_IT_CC4) != RESET)
  {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC4);
capture = TIM_GetCapture4(TIM2);
TIM_SetCompare4(TIM2, capture + CCR4_Val);
  }
}

但是将TIM2改成TIM1时发现输出不了。纠结了n久才发现要打开TIM_CtrlPWMOutputs(TIM1, ENABLE)；  （或者TIM1->BDTR=8000；），

TIM1比TIM2在功能上强大不说，但要实现同样的输出比较功能，这个有点太邪门了。。。。。。
怨念啊怨念.....