stm32单片机个人学习笔记11（ADC模数转换器）

前言

本篇文章属于stm32单片机（以下简称单片机）的学习笔记，来源于B站教学视频。下面是这位up主的视频链接。本文为个人学习笔记，只能做参考，细节方面建议观看视频，肯定受益匪浅。

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一、 ADC简介

逐次逼近型ADC

ADC基本结构

输入通道

转换模式有单次转换或多次转换、扫描模式或非扫描模式

非扫描模式只选中一个通道，单次转换后就停下来了，多次转换不停止

扫描模式可以一次选中多个通道

数据对齐的方式，一般使用右对齐

ADC的自校准，在初始化完上电后启动校准

ADC的硬件电路

二、实例一（AD单通道）

AD.c

#include "stm32f10x.h"                  // Device header/*** @brief  AD初始化* @param  无* @retval 无*/
void AD_Init(void)
{//开启时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//ADC预分频RCC_ADCCLKConfig(RCC_PCLK2_Div6);//GPIO初始化GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);//ADC选择通道ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);//ADC初始化ADC_InitTypeDef ADC_InitStructure;ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;ADC_InitStructure.ADC_ScanConvMode = DISABLE;ADC_InitStructure.ADC_NbrOfChannel = 1;ADC_Init(ADC1, &ADC_InitStructure);//开启ADC电源ADC_Cmd(ADC1, ENABLE);//ADC校准ADC_ResetCalibration(ADC1);while(ADC_GetResetCalibrationStatus(ADC1));ADC_StartCalibration(ADC1);while(ADC_GetCalibrationStatus(ADC1));
}/*** @brief  AD获取转换值* @param  无* @retval 转换得到的值*/
uint16_t AD_Getvalue(void)
{ADC_SoftwareStartConvCmd(ADC1, ENABLE);while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);return ADC_GetConversionValue(ADC1);
}

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "AD.h"uint16_t ADValue;
float Voltage;int main(void)
{OLED_Init();AD_Init();OLED_ShowString(1,1,"ADValue:");OLED_ShowString(2,1,"Voltage:0.00V");while (1){ADValue = AD_Getvalue();Voltage = (float)ADValue / 4095 * 3.3;OLED_ShowNum(1,9,ADValue,4);OLED_ShowNum(2,9,Voltage,1);OLED_ShowNum(2,11,(uint16_t)(Voltage * 100) % 100,2);Delay_ms(100);}
}

三、实例二（AD多通道）

AD.c

#include "stm32f10x.h"                  // Device header/*** @brief  AD初始化* @param  无* @retval 无*/
void AD_Init(void)
{//开启时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//ADC预分频RCC_ADCCLKConfig(RCC_PCLK2_Div6);//GPIO初始化GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 |GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);//ADC初始化ADC_InitTypeDef ADC_InitStructure;ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;ADC_InitStructure.ADC_ScanConvMode = DISABLE;ADC_InitStructure.ADC_NbrOfChannel = 1;ADC_Init(ADC1, &ADC_InitStructure);//开启ADC电源ADC_Cmd(ADC1, ENABLE);//ADC校准ADC_ResetCalibration(ADC1);while(ADC_GetResetCalibrationStatus(ADC1));ADC_StartCalibration(ADC1);while(ADC_GetCalibrationStatus(ADC1));
}/*** @brief  AD获取转换值* @param  无* @retval 转换得到的值*/
uint16_t AD_Getvalue(uint8_t ADC_Channel)
{ADC_RegularChannelConfig(ADC1, ADC_Channel, 1, ADC_SampleTime_55Cycles5);ADC_SoftwareStartConvCmd(ADC1, ENABLE);while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);return ADC_GetConversionValue(ADC1);
}

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "AD.h"uint16_t AD0,AD1,AD2,AD3;int main(void)
{OLED_Init();AD_Init();OLED_ShowString(1,1,"AD0:");OLED_ShowString(2,1,"AD1:");OLED_ShowString(3,1,"AD2:");OLED_ShowString(4,1,"AD3:");while (1){AD0 = AD_Getvalue(ADC_Channel_0);AD1 = AD_Getvalue(ADC_Channel_1);AD2 = AD_Getvalue(ADC_Channel_2);AD3 = AD_Getvalue(ADC_Channel_3);OLED_ShowNum(1,5,AD0,4);OLED_ShowNum(2,5,AD1,4);OLED_ShowNum(3,5,AD2,4);OLED_ShowNum(4,5,AD3,4);Delay_ms(100);}
}