STM32F0 adc采集

#define BSRR_VAL        0x0300

 

ADC_InitTypeDef          ADC_InitStructure;

GPIO_InitTypeDef         GPIO_InitStructure;

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

TIM_OCInitTypeDef        TIM_OCInitStructure;

 

void delay_ms(int i)

{

  int s;

  while(i--)

{

  s=8000;

  while(s--);

}

}

 

int main(void)

{

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

 

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_Init(GPIOC, &GPIO_InitStructure);

 

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 ;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;

  GPIO_Init(GPIOC, &GPIO_InitStructure);

 

  /* TIM3 Configuration*/

  TIM_DeInit(TIM3);

  

  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

  

  TIM_OCStructInit(&TIM_OCInitStructure);

    

  /* Time base configuration */

  TIM_TimeBaseStructure.TIM_Period = 0xFF;

  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;

  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  

  /* TIM3 TRGO selection */

  TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);

 

  ADC_DeInit(ADC1);

  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;

  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;    

  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;

  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;

  ADC_Init(ADC1, &ADC_InitStructure); 

  ADC_ChannelConfig(ADC1, ADC_Channel_11 , ADC_SampleTime_28_5Cycles);   

  ADC_GetCalibrationFactor(ADC1);

  ADC_WaitModeCmd(ADC1, ENABLE); 

  ADC_AutoPowerOffCmd(ADC1, ENABLE); 

  ADC_Cmd(ADC1, ENABLE);     

  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN)); 

 

TIM_Cmd(TIM3, ENABLE);

 

  ADC_StartOfConversion(ADC1);

 

  while (1)

  { 

    /* Get ADC1 converted data */

    ADC1ConvertedValue = ADC_GetConversionValue(ADC1);

    

    /* Compute the voltage */

    ADC1ConvertedVoltage = (ADC1ConvertedValue * 3300)/0xFFF;

    /* Set PC8 and PC9 */

    GPIOC->BSRR = BSRR_VAL;

    delay_ms((int)(ADC1ConvertedVoltage/5));

    /* Reset PC8 and PC9 */

    GPIOC->BRR = BSRR_VAL;

    delay_ms((int)(ADC1ConvertedVoltage/5));

  }

}