STM32 ADC注入通道使用方法详解

最近要做市电电压波形的THD计算，同学推荐用注入通道来采集，因为对ADC的了解仅限于规则通道和软件触发，并没有接触过定时器触发，注入通道和ADC中断，所以磕磕绊绊配置了很多天，刚刚终于配置好了一路注入通道ADC采集，在这里分享一下

这一段是ADC的配置代码，触发源采用T2_TROG

#include "adc.h"
#include "sys.h"
#include "usart.h"
#include <stdio.h>
volatile uint16_t adcConvertedValue=1;


void adc_init(void)
{
	    // 初始化ADC1
	
    ADC_InitTypeDef ADC_InitStructure;
	  NVIC_InitTypeDef NVIC_Initst;
	  GPIO_InitTypeDef GPIO_Initstruct;
	
	  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
	  RCC_ADCCLKConfig(RCC_PCLK2_Div8);   //ADC时钟
	  
	  //配置ADC IO模式
		GPIO_Initstruct.GPIO_Mode=GPIO_Mode_AIN;
		GPIO_Initstruct.GPIO_Pin=GPIO_Pin_2;
		GPIO_Initstruct.GPIO_Speed=GPIO_Speed_10MHz;
   	GPIO_Init(GPIOA,&GPIO_Initstruct);
		//初始化ADC IO
		

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigInjecConv_T2_TRGO;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);
		
		// 使能ADC1
    ADC_Cmd(ADC1, ENABLE);
		
		/* 重置ADC校准 */
		ADC_ResetCalibration(ADC1);
		/* 等待初始化完成 */
		while(ADC_GetResetCalibrationStatus(ADC1));

    // ADC开始校准
	  ADC_StartCalibration(ADC1);
		// 等待校准完成
		while(ADC_GetCalibrationStatus(ADC1));
		
    
		//注入通道配置//
		
		ADC_InjectedSequencerLengthConfig(ADC1, 1); // 注入通道序列长度为 1
		
    ADC_InjectedChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_55Cycles5); // 配置注入通道 0
		
		//外部触发源设置
		
		ADC_ExternalTrigInjectedConvConfig(ADC1,ADC_ExternalTrigInjecConv_T2_TRGO);//外部触发源设置
		
    ADC_ExternalTrigInjectedConvCmd(ADC1, ENABLE); //设置外部触发使能
		
	  ADC_ClearITPendingBit(ADC1, ADC_IT_JEOC);  // 清除寄存器标志位
		
    ADC_ITConfig(ADC1, ADC_IT_JEOC, ENABLE);// 使能ADC注入中断
		
		
		NVIC_Initst.NVIC_IRQChannel=ADC1_2_IRQn;
		NVIC_Initst.NVIC_IRQChannelCmd=ENABLE;
		NVIC_Initst.NVIC_IRQChannelPreemptionPriority=0;
		NVIC_Initst.NVIC_IRQChannelSubPriority=0;
		NVIC_Init(&NVIC_Initst);
		

	
}

void ADC1_2_IRQHandler(void)
{
    if (ADC_GetITStatus(ADC1, ADC_IT_JEOC)== SET) // 检查转换结束中断
    {
			if (ADC_GetFlagStatus(ADC1, ADC_FLAG_JEOC) == SET)
			{
					adcConvertedValue = ADC_GetInjectedConversionValue(ADC1,ADC_InjectedChannel_1); // 读取转换结果
					printf("%hu\r\n",adcConvertedValue);
					ADC_ClearITPendingBit(ADC1, ADC_IT_JEOC); // 清除中断标志位
					//ADC_SoftwareStartConvCmd(ADC1, ENABLE);
			}
     
			
    }
}

下面是定时器2的代码

#include "timer1.h"
#include "sys.h"
#include <stdio.h>
void TIM2_init(void)
 
{
 
		TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
		 
		TIM_OCInitTypeDef TIM_OCInitStructure;
		
		RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
		 
		TIM_TimeBaseStructure.TIM_Period = 1000; //设置100ms一次TIM2比较的周期
		 
		TIM_TimeBaseStructure.TIM_Prescaler = 71;//系统主频72M，这里分频720，相当于100K的定时器2时钟
		 
		TIM_TimeBaseStructure.TIM_ClockDivision = 0x00;
		 
		TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
		 
		TIM_TimeBaseInit(TIM2, & TIM_TimeBaseStructure);
		 
		TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//下面详细说明
		 
		TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//TIM_OutputState_Disable;
		 
		TIM_OCInitStructure.TIM_Pulse = 500;
		 
		TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//如果是PWM1要为Low，PWM2则为High
		 
		TIM_OC2Init(TIM2, & TIM_OCInitStructure);
		 
		TIM_Cmd(TIM2, ENABLE);
		// 使能 TIM2 的 CC1 触发源
    TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_OC1);

 
}

下面是main函数的代码

#include "stm32f10x.h"
#include <stdio.h>
#include "delay.h"
#include "usart.h"
#include "adc.h"
#include "timer1.h"


int main(void)
{
	  
   
      delay_init();
	  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	  uart_init(115200);
	  adc_init();
	  TIM2_init();
	
		
    while (1)
    {
      ；
    }
}

最后把代码链接贴这里

提取码：1eqb

第一次写博客，各位大佬多多担待

作者：轩轩&婷婷