版主你好，请教您一个定时器的问题

只看该作者 · 2011-11-30 20:58

我用的是stm32f107，是要用TIM1的1通道比较触发AD转换，但是我芯片外接的PHY也要使用TIM1的1通道所在引脚PA8所以，我只想让TIM触发AD转换，但是不让他使用引脚，怎么办啊，下面是我TIM的配置，请您指点下应该改哪几句，还有请问怎么使用TIM的TRGO触发AD啊，希望您能给一个示范的例子，谢谢了。
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Period = 469;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 200;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);

DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_RegularConvertedValueTab;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 6;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular ;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);



  DMA_Cmd(DMA1_Channel1, ENABLE);

  DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);

  ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC2;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfChannel = 6;
  ADC_Init(ADC1, &ADC_InitStructure);
  /*使用AD0,3,4  作为电压的ABC三相采集使用引脚PA0,PA3,PA4*/
  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 2, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 3, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 4, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 5, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 6, ADC_SampleTime_71Cycles5);
  ADC_DMACmd(ADC1, ENABLE);

  ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;
  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_InitStructure.ADC_NbrOfChannel = 6;
  ADC_Init(ADC2, &ADC_InitStructure);

  ADC_RegularChannelConfig(ADC2, ADC_Channel_5, 1, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC2, ADC_Channel_6, 2, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC2, ADC_Channel_7, 3, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC2, ADC_Channel_8, 4, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC2, ADC_Channel_9, 5, ADC_SampleTime_71Cycles5);
  ADC_RegularChannelConfig(ADC2, ADC_Channel_10, 6, ADC_SampleTime_71Cycles5);

  ADC_ExternalTrigConvCmd(ADC1, ENABLE);
  ADC_ExternalTrigConvCmd(ADC2, ENABLE);


  ADC_Cmd(ADC1, ENABLE);

  ADC_TempSensorVrefintCmd(ENABLE);

  ADC_ResetCalibration(ADC1);

  while(ADC_GetResetCalibrationStatus(ADC1));


  ADC_StartCalibration(ADC1);

  while(ADC_GetCalibrationStatus(ADC1));

  ADC_Cmd(ADC2, ENABLE);


  ADC_ResetCalibration(ADC2);

  while(ADC_GetResetCalibrationStatus(ADC2));


  ADC_StartCalibration(ADC2);

  while(ADC_GetCalibrationStatus(ADC2));
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);