使用STM32F3系列进行ADC外部事件触发采集

#ifndef __ADC_H

#define __ADC_H



#include <stm32f30x.h>



#define ADC1_IN3_PORT GPIOA

#define ADC1_IN3_PIN  GPIO_Pin_2



void  Adc_Init(void);



#endif

#include "adc.h"

#include "delay.h"



void Adc_Init(void)

{

    /*define structure variables*/

    GPIO_InitTypeDef GPIO_InitStructure;

    ADC_InitTypeDef ADC_InitStructure;

    ADC_CommonInitTypeDef ADC_CommonInitStructure;



    /* Enable ADC1 clock */

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_ADC12,ENABLE);  

    /* Configure the ADC clock */

    /*配置ADC时钟为PLL时钟*/

    RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div1); 



    /*配置GPIO为PA2,Pin3 模拟输入*/

    GPIO_InitStructure.GPIO_Pin = ADC1_IN3_PIN;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;

    GPIO_Init(ADC1_IN3_PORT,&GPIO_InitStructure); 



    /*默认初始化ADC结构体*/

    ADC_StructInit(&ADC_InitStructure);

    /* Calibration procedure */ 

    ADC_VoltageRegulatorCmd(ADC1, ENABLE);

    delay_us(10);



    /*ADC_CalibrationMode_Single: to select the calibration for single channel*/

    ADC_SelectCalibrationMode(ADC1, ADC_CalibrationMode_Single);

    ADC_StartCalibration(ADC1); 

    while(ADC_GetCalibrationStatus(ADC1));//waiting finish

        //ADC_CommonInitTypeDef 主要为双重ADC配置，我们只需要配置ADC为独立模式和异步时钟即可

    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;   //独立模式               

    ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode; //ADC异步时钟模式             

    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

    ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;                

    ADC_CommonInitStructure.ADC_TwoSamplingDelay = 0;           

    ADC_CommonInit(ADC1, &ADC_CommonInitStructure);



    ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable;//连续转换失能

    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //精度为12位

    //外部触发事件6，即EXTI11中断线

    ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_6; 

    //外部事件上升沿触发，也可选择下降沿，需要与EXTI对应

    ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_RisingEdge;

    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;        //数据右对齐

    ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable;   

    ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable;  

    ADC_InitStructure.ADC_NbrOfRegChannel = 1;//the number of ADC channels that will be converted

    ADC_Init(ADC1, &ADC_InitStructure);

 

    /*配置规则通道参数，设置指定ADC的规则通道，一个序列，采样时间：ADC1通道3，采样时间 1.5个周期*/

    ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 1, ADC_SampleTime_1Cycles5);   



    //使能ADC1

    ADC_Cmd(ADC1,ENABLE);



    /* wait for ADRDY */

    while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_RDY));  

}

#ifndef __EXTI_H

#define __EXTI_H



#include <stm32f30x.h>



#define TRIG_PORT GPIOB

#define TRIG_PIN  GPIO_Pin_11



extern void Exti_Init(void);   



#endif

#include "exti.h"



void Exti_Init(void)

{    

    /* Private variables ---------------------------------------------------------*/

    EXTI_InitTypeDef   EXTI_InitStructure;

    GPIO_InitTypeDef   GPIO_InitStructure;



    /* Enable GPIOB clock */

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

    /* Enable SYSCFG clock */

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);



    /* Configure PB11 pin in input no-pull mode */

    GPIO_InitStructure.GPIO_Pin = TRIG_PIN;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

    GPIO_Init(TRIG_PORT, &GPIO_InitStructure);



    /* Connect EXTI11 Line to PB11 pin */

    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource11);



    /* Configure EXTI11 line */

    EXTI_InitStructure.EXTI_Line = EXTI_Line11;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Event;//配置为Event模式即可

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;//上升沿触发

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;



    EXTI_Init(&EXTI_InitStructure);

}

#include "adc.h"

#include "exti.h"

#include "delay.h"

#include "usart.h"



int main(void)

{

    float ADC1ConvertedValue;



    delay_init();

    Exti_Init();

    Adc_Init();

    usart_init();



    ADC_StartConversion(ADC1);//开启ADC1转换

    while(1)

    {

        while(ADC_GetFlagStatus(ADCx, ADC_FLAG_EOC) == RESET);

        /*参考电压为3.3V，12位精度为0xFFF*/

        ADC1ConvertedValue =ADC_GetConversionValue(ADC1)*3.3/0xFFF;

    }

    return 0;

}