本帖最后由 mmuuss586 于 2014-5-3 11:56 编辑
楼上正解。
楼主，看下函数的原型就明白了
/**
* @brief Configures the TIMx Trigger as External Clock
* @param TIMx: where x can be 2, 3, 4, 5 or 9 to select the TIM peripheral.
* @param TIM_TIxExternalCLKSource: Trigger source.
* This parameter can be one of the following values:
* @arg TIM_TIxExternalCLK1Source_TI1ED: TI1 Edge Detector.
* @arg TIM_TIxExternalCLK1Source_TI1: Filtered Timer Input 1.
* @arg TIM_TIxExternalCLK1Source_TI2: Filtered Timer Input 2.
* @param TIM_ICPolarity: specifies the TIx Polarity.
* This parameter can be one of the following values:
* @arg TIM_ICPolarity_Rising:
* @arg TIM_ICPolarity_Falling:
* @param ICFilter : specifies the filter value.
* This parameter must be a value between 0x0 and 0xF.
* @retval None
*/
void TIM_TIxExternalClockConfig(TIM_TypeDef* TIMx, uint16_t TIM_TIxExternalCLKSource,
uint16_t TIM_ICPolarity, uint16_t ICFilter)
{
/* Check the parameters */
assert_param(IS_TIM_LIST2_PERIPH(TIMx));
assert_param(IS_TIM_IC_POLARITY(TIM_ICPolarity));
assert_param(IS_TIM_IC_FILTER(ICFilter));
/* Configure the Timer Input Clock Source */
if (TIM_TIxExternalCLKSource == TIM_TIxExternalCLK1Source_TI2)
{
TI2_Config(TIMx, TIM_ICPolarity, TIM_ICSelection_DirectTI, ICFilter);
}
else
{
TI1_Config(TIMx, TIM_ICPolarity, TIM_ICSelection_DirectTI, ICFilter);
}
/* Select the Trigger source */
TIM_SelectInputTrigger(TIMx, TIM_TIxExternalCLKSource);
/* Select the External clock mode1 */
TIMx->SMCR |= TIM_SlaveMode_External1;
}
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楼主
