ADC是單片機(jī)也是STM32在工控上常用功能之一，用來(lái)采集電壓，溫度等作為指標(biāo)提供給其他部分進(jìn)行對(duì)應(yīng)的操作，使用32的固件庫(kù)進(jìn)行配置相當(dāng)方便。

這里利用串口打印的方式觀察采集到的電壓。

#include "adc.h"

void adc_init()

{

GPIO_InitTypeDef GPIO_InitStructure;

ADC_InitTypeDef ADC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;//ADC GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN; // GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStructure);

ADC_InitStructure.ADC_Mode =ADC_Mode_Independent;//獨(dú)立工作ADC_InitStructure.ADC_ScanConvMode = DISABLE; //單次掃描 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //單次轉(zhuǎn)換 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//軟件啟動(dòng)

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//右對(duì)齊數(shù)據(jù) ADC_InitStructure.ADC_NbrOfChannel = 1;

ADC_Init(ADC1, &ADC_InitStructure);

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1,ADC_SampleTime_7Cycles5);//通道規(guī)則組設(shè)置

ADC_Cmd(ADC1,ENABLE);

ADC_ResetCalibration(ADC1);//ADC寄存器重置

while(ADC_GetResetCalibrationStatus(ADC1));//獲取重置狀態(tài)

ADC_StartCalibration(ADC1);//開啟指定校準(zhǔn)寄存器

while(ADC_GetCalibrationStatus(ADC1));//獲取校準(zhǔn)

ADC_SoftwareStartConvCmd(ADC1, ENABLE);//開啟軟件啟動(dòng)

}

#include "printf.h"

int fputc(int ch,FILE *p) //

{

USART_SendData(USART1,(u8)ch);

while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);

return ch;

}

void printf_init()

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA,&GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 9600;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;

USART_InitStructure.USART_StopBits = USART_StopBits_1;

USART_InitStructure.USART_Parity = USART_Parity_No;

USART_InitStructure.USART_HardwareFlowControl =USART_HardwareFlowControl_None;

USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

// USART_InitStructure.USART_Clock = USART_Clock_Disable;

// USART_InitStructure.USART_CPOL = USART_CPOL_High;

// USART_InitStructure.USART_CPHA = USART_CPHA_1Edge;

// USART_InitStructure.USART_LastBit = USART_LastBit_Enable;

USART_Init(USART1, &USART_InitStructure);

USART_Cmd(USART1, ENABLE);

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

USART_ClearFlag(USART1,USART_FLAG_TC);

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

int main()

{

u8 i = 0;

float ad = 0;

printf_init();

adc_init();

while(1){

for(i = 0;i < 10;i++){

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

while(!ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC));//轉(zhuǎn)換結(jié)束標(biāo)志

ad=ad+ADC_GetConversionValue(ADC1);//累加轉(zhuǎn)換結(jié)果

}

ad /= 10;

printf("ad : %.3f Vrn",ad*3.3/4096);

delay_ms(1000);

delay_ms(1000);

}

}