用TIM8的CCR4触发ADC3的注入转换不成功，用TIM1的CCR4触发成功，求真相？

只看该作者 · 2013-11-21 10:35

问题：拟用TIM8的CCR4触发ADC3的两个通道注入转换，但是ADC3总是没有被触发，如果换成TIM1的CCR4就可以工作。我对TIM1与TIM8的配置是一样一样的。想不明白为什么不行，因为按着手册上来讲，这两种触发源对ADC3应该都是起作用的啊。下边为我的ADC3配置（时钟已在别处统一配置），请大家看看，是哪出了问题？
/*************************************************
  * @functionname:AD_Init(void)
  * @brief  Configures AD of module
  * @retval None
  * @others
*************************************************/
void AD_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

   ADC_InitStructure.ADC_Mode = ADC_Mode_InjecSimult;
   ADC_InitStructure.ADC_ScanConvMode = ENABLE;
   ADC_InitStructure.ADC_ContinuousConvMode=DISABLE;
   ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
   ADC_Init(ADC3, &ADC_InitStructure);

ADC_InjectedSequencerLengthConfig(ADC3, 2);//配置注入组总长度
ADC_InjectedChannelConfig(ADC3,  ADC_Channel_2, 1, ADC_SampleTime_7Cycles5);
ADC_InjectedChannelConfig(ADC3,  ADC_Channel_3, 2, ADC_SampleTime_7Cycles5);
ADC_ExternalTrigInjectedConvConfig(ADC3, ADC_ExternalTrigInjecConv_T8_CC4);
ADC_ExternalTrigInjectedConvCmd(ADC3,ENABLE);

ADC_ITConfig(ADC3, ADC_IT_JEOC, ENABLE);
ADC_SoftwareStartConvCmd(ADC3,ENABLE);
ADC_Cmd(ADC3,ENABLE);

ADC_ResetCalibration(ADC3);
while(ADC_GetResetCalibrationStatus(ADC3));
ADC_StartCalibration(ADC3);
while(ADC_GetCalibrationStatus(ADC3));//

NVIC_InitStructure.NVIC_IRQChannel = ADC3_IRQn;//ADC1_2_IRQn; //ADC1,ADC2全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//从优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

ADC_Cmd(ADC3,DISABLE);
}