STM32 ADC conversion interrupt read

The ADC interrupt reading method is suitable for low-frequency ADC acquisition, while high-frequency AD acquisition must use DMA.

The initialization function of ADC interrupt reading only adds an interrupt configuration file compared to the direct reading method in the previous article. The code is as follows:

static void ADC_GPIO_Config(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //ʹÄÜPB,PE¶Ë¿ ÚʱÖÓ

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;

GPIO_Init(GPIOA, &GPIO_InitStructure);

}

static void ADC_Mode_Config(void)

{

  ADC_InitTypeDef ADC_InitStructure;

//ADC_GPIO_Config();

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

ADC_DeInit(ADC1);

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

ADC_InitStructure.ADC_ScanConvMode=DISABLE;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfChannel=ADC_Channel_1;

ADC_Init(ADC1,&ADC_InitStructure);

RCC_ADCCLKConfig(RCC_PCLK2_Div8); 

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5);

ADC_ITConfig(ADC1,ADC_IT_EOC,ENABLE);

  ADC_Cmd(ADC1,ENABLE);

ADC_ResetCalibration(ADC1);

while(ADC_GetResetCalibrationStatus(ADC1));

ADC_StartCalibration(ADC1);

while(ADC_GetCalibrationStatus(ADC1));

ADC_SoftwareStartConvCmd(ADC1,ENABLE);

}

static void ADC_NVIC_Config()

{

NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

       NVIC_InitStructure.NVIC_IRQChannel = ADC1_2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

void ADC_InitConfig(void)

{

ADC_NVIC_Config();

       ADC_GPIO_Config();

ADC_Mode_Config();

}

The red part above is the code that needs to be added. Analyzing the above code, it actually allows ADC interrupts and sets the interrupt priority.

I won’t post the actual effect pictures, the codes have all been tested. By the way, there is still an interrupt service function that has not been posted.

void ADC1_2_IRQHandler(void)

{

      if(ADC_GetITStatus(ADC1,ADC_IT_EOC) == SET)

{

 adcconverdata=ADC_GetConversionValue(ADC1);

}

ADC_ClearITPendingBit(ADC1,ADC_IT_EOC);

}