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STM32-ADC

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1. 1 Introduction

STM32 have one of the most advanced ADCs on microcontroller market.

This note provide users to understand some modes offered in STM32

2. 2 Independent Mode

  • Single Channel, single conversion

Example: Check if the battery voltage is succulent or not

single-conversion

  • Multichannel, single conversion

Example: Can be used when starting system depends on some parameters

  • Single Channel, continuous conversion

Example: Run in background, so can be used as a monitor to check something all the time

continuous-conversion

  • Injected conversion

Intended for use when conversion is triggered by an external event or by software.

Injected-conversion

3. 3 Example Code

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void GPIOINIT_ADC()
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;//ADC
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;	//模拟输入
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);

}
void RCCINIT_ADC()
{
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);//12M  最大14M 设置ADC时钟（ADCCLK）
}
void ADCINIT_ADC()
{

ADC_InitTypeDef ADC_InitStructure;
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_TempSensorVrefintCmd(ENABLE);
ADC_Cmd(ADC1,ENABLE);

ADC_ResetCalibration(ADC1);//重置指定的ADC的校准寄存器
while(ADC_GetResetCalibrationStatus(ADC1));//获取ADC重置校准寄存器的状态

ADC_StartCalibration(ADC1);//开始指定ADC的校准状态
while(ADC_GetCalibrationStatus(ADC1));//获取指定ADC的校准程序
ADC_RegularChannelConfig(ADC1,ADC_Channel_8,1,ADC_SampleTime_239Cycles5);//设置指定ADC的规则组通道，设置它们的转化顺序和采样时间
ADC_SoftwareStartConvCmd(ADC1, ENABLE);//使能或者失能指定的ADC的软件转换启动功能
while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);

}