【原创】多通道ADC转换配置(STM32F407ZE)

ID:90014 · 发表于 2015-9-14 15:14

以下代码参考了网络资料, 代码通过实测验证。
在main.c文件中的相关代码:
uint16_t ADC_Value[10][4];
uint16_t Flag_ADC_Finished = 0;
void ADC_Config(void);

void main()
{

  ADC_Config();

  while (1)
  {
if(Flag_ADC_Finished){
   Flag_ADC_Finished = 0;
   DMA2_Stream0->M0AR = (uint32_t)(&ADC_Value[0][0]);
   DMA2_Stream0->NDTR = 40;
   DMA_Cmd(DMA2_Stream0, ENABLE);
   ADC_Cmd(ADC1, ENABLE);
   ADC_SoftwareStartConv(ADC1);
}
  }
}

/**
  * @brief  ADC_Config
  * @note This function Configure the ADC peripheral
  *       1) Enable peripheral clocks
  *       2) Configure ADC Channel 12、8、13、9 pin as analog input
  *       3) DMA2_Stream0 channel0 configuration
  *       4) Configure ADC1 Channel 12、8、13、9(PC2 PC3 PB0 PB1)
  * @param  None
  * @retval None
  */
void ADC_Config()
{
  GPIO_InitTypeDef GPIO_InitStruct;
  ADC_InitTypeDef ADC_InitStruct;
  ADC_CommonInitTypeDef ADC_CommonInitStruct;
  DMA_InitTypeDef DMA_InitStruct;
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
  ADC_DeInit();
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

  DMA_InitStruct.DMA_Channel = DMA_Channel_0;
  DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&ADC1->DR);
  DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)(&ADC_Value[0][0]);
  DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStruct.DMA_BufferSize = 40;
  DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStruct.DMA_Priority = DMA_Priority_Low;
  DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA2_Stream0, &DMA_InitStruct);
  DMA_Cmd(DMA2_Stream0, ENABLE);
  /* DMA2_Stream0 Channel 0 */
DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);

  NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  /*
PC2: ADC_Channel_12 --> AIW0 (0～5V)
PB0: ADC_Channel_8  --> AIW2 (0～5V)
PC3: ADC_Channel_13 --> AIW4 (0～5V)
PB1: ADC_Channel_9  --> AIW6 (0～5V)
*/
  GPIO_InitStruct.GPIO_Pin  = GPIO_Pin_0 | GPIO_Pin_1;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOB, &GPIO_InitStruct);

  GPIO_InitStruct.GPIO_Pin  = GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_Init(GPIOC, &GPIO_InitStruct);
  /* ADC Common Init **********************************************************/
  ADC_CommonInitStruct.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStruct.ADC_Prescaler = ADC_Prescaler_Div6;
  ADC_CommonInitStruct.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
  ADC_CommonInitStruct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInit(&ADC_CommonInitStruct);
  /* ADC1 Init ****************************************************************/
  ADC_StructInit(&ADC_InitStruct);
  ADC_InitStruct.ADC_ScanConvMode = ENABLE;
  ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
  ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStruct.ADC_NbrOfConversion = 4; /* for PC2 PC3 PB0 PB1 */
  ADC_Init(ADC1,&ADC_InitStruct);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 1, ADC_SampleTime_56Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_8,  2, ADC_SampleTime_56Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 3, ADC_SampleTime_56Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_9,  4, ADC_SampleTime_56Cycles);
  /* Enable DMA request after last transfer (Single-ADC mode) */
  ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
  ADC_DMACmd(ADC1, ENABLE);
  ADC_Cmd(ADC1, ENABLE);
  ADC_SoftwareStartConv(ADC1);

}

在stm32fxxx_it.c文件中的相关代码:
extern uint16_t Flag_ADC_Finished;
/**
  * @brief  This function handles DMA2_Stream0_IRQHandler global interrupt request.
  * @param  None
  * @retval None
  */
void DMA2_Stream0_IRQHandler(void)
{
  if (DMA_GetITStatus(DMA2_Stream0, DMA_IT_TCIF0) != RESET) {
DMA_Cmd(DMA2_Stream0, DISABLE);
DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_TCIF0);
ADC_Cmd(ADC1, DISABLE);
Flag_ADC_Finished = 1;
  }
}

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