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。
STM32入门教程-2023版 细致讲解 中文字幕_哔哩哔哩_bilibili
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);
}
}
这里是通过单次转换非扫描模式,每次转换选取不同的通道来达到多通道的目的,用扫描模式达到多通道的目的要通过DMA,这个下节再使用