[嵌入式]STM32板子ADC模数转换实验

一般步骤：

①：开始PA口时钟和ADC1时钟，设置PA1为模拟输入

GPIO_Init();

APB2PeriphClockCmd();

②：复位ADC1，同时设置ADC1分频因子。

RCC_ADCCLKConfig(RCC_PCLK2_Div6);

ADC_DeInit(ADC1);

③：初始化ADC1参数，设置ADC1的工作模式以及规则序列的相关信息。

void ADC_Init(ADC_TypeDef*ADCx,ADC_InitTypeDef*ADC_InitStruct);

④：使能ADC并校准

ADC_Cmd(ADC1,ENABLE);

⑤：配置规则通道参数：

ADC_RegularChannelConfig();

⑥：开启软件转换：ADC_SoftwareStartConvCmd(ADC1);

⑦：等待转换完成，读取ADC值

ADC_GetConversionValue(ADC1);

我们先写.h文件

#ifndef __ADC_H
#define __ADC_H	
#include "sys.h"
void Adc_Init(void);
u16  Get_Adc(u8 ch); 
u16 Get_Adc_Average(u8 ch,u8 times);  
#endif 

然后写最麻烦的.c文件

 #include "adc.h"
 #include "delay.h"														   
void  Adc_Init(void)
{ 	
	ADC_InitTypeDef ADC_InitStructure; 
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1	, ENABLE );	
	RCC_ADCCLKConfig(RCC_PCLK2_Div6);                   
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
	GPIO_Init(GPIOA, &GPIO_InitStructure);	
	ADC_DeInit(ADC1);
	ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
	ADC_InitStructure.ADC_ScanConvMode = DISABLE;	
	ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
	ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
	ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;	
	ADC_InitStructure.ADC_NbrOfChannel = 1;	
	ADC_Init(ADC1, &ADC_InitStructure);	
	ADC_Cmd(ADC1, ENABLE);
	ADC_ResetCalibration(ADC1);
	while(ADC_GetResetCalibrationStatus(ADC1));
	ADC_StartCalibration(ADC1);
	while(ADC_GetCalibrationStatus(ADC1));
}				  
u16 Get_Adc(u8 ch)   
{
	ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 );			    
	ADC_SoftwareStartConvCmd(ADC1, ENABLE);
	while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));
	return ADC_GetConversionValue(ADC1);
}

u16 Get_Adc_Average(u8 ch,u8 times)
{
	u32 temp_val=0;
	u8 t;
	for(t=0;t<times;t++)
	{
		temp_val+=Get_Adc(ch);
		delay_ms(5);
	}
	return temp_val/times;
} 	 

最后是.main文件

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "lcd.h"
#include "usart.h"	 
#include "adc.h" 
 int main(void)
 {	 
  u16 adcx;
	float temp;
	delay_init();	  
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	uart_init(115200);
 	LED_Init();	
	LCD_Init();			 	
 	Adc_Init();		
	POINT_COLOR=RED;
	LCD_ShowString(60,50,200,16,16,"Elite STM32");	
	LCD_ShowString(60,70,200,16,16,"ADC TEST");	
	LCD_ShowString(60,90,200,16,16,"ATOM@ALIENTEK");
	LCD_ShowString(60,110,200,16,16,"2015/1/14");	
	POINT_COLOR=BLUE;
	LCD_ShowString(60,130,200,16,16,"ADC_CH0_VAL:");	      
	LCD_ShowString(60,150,200,16,16,"ADC_CH0_VOL:0.000V");	       
	while(1)
	{
		adcx=Get_Adc_Average(ADC_Channel_1,10);
		LCD_ShowxNum(156,130,adcx,4,16,0);
		temp=(float)adcx*(3.3/4096);
		adcx=temp;
		LCD_ShowxNum(156,150,adcx,1,16,0);
		temp-=adcx;
		temp*=1000;
		LCD_ShowxNum(172,150,temp,3,16,0X80);
		LED0=!LED0;
		delay_ms(250);	
	}
 }