关于定时器触发ADC采样加入DMA无法设置采样率的问题

启林 · 发表于 2023-5-24 15:12:14

//DMA配置
void DMA_Configuration()
{
  DMA_InitTypeDef DMA_InitStructure;
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);

  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_BufferSize = 1;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Disable;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&ADC1->DR);
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_Priority=DMA_Priority_High;
  DMA_Init(DMA1_Channel1,&DMA_InitStructure);

  ADC_DMACmd(ADC1,ENABLE);
  DMA_Cmd(DMA1_Channel1, ENABLE);
}
//ADC配置定时器触发void  ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_ADC1,ENABLE);
      RCC_ADCCLKConfig(RCC_PCLK2_Div6);


GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);

ADC_DeInit(ADC1);

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);

ADC_RegularChannelConfig(ADC1,ADC_Channel_0,1, ADC_SampleTime_239Cycles5 );
      ADC_ExternalTrigConvCmd(ADC1,ENABLE);
ADC_Cmd(ADC1, ENABLE);
ADC_DMACmd(ADC1,ENABLE);


ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
}
//定时器配置
void TIM2_Int_Init(u16 arr,u16 psc)
{
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef TIM_OCInitStructure;
      GPIO_InitTypeDef GPIO_InitStructure;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr-1;
TIM_TimeBaseStructure.TIM_Prescaler =psc-1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_Pulse=arr/2;
TIM_OC2Init(TIM2,&TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Enable);
      TIM_CtrlPWMOutputs(TIM2, ENABLE);
TIM_Cmd(TIM2, ENABLE);
}