stm32片上ADC转换实验

原理图所示：

BAT_DET 接到PB0 引脚，VSYS 是直流3.7V的电压。再来看下103的adc转换和引脚GPIO的关系

我们直接选用ADC1 根据上表格只能使用通道8

下面给我常用的ADC1寄存器配置和使用实验

 1 #include "ADC.h"
 2 
 3 
 4 void ADCInit(void)
 5 {
 6     
 7     ADC_InitTypeDef ADC_InitStructure; 
 8     GPIO_InitTypeDef GPIO_InitStructure;
 9 
10     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB |RCC_APB2Periph_ADC1, ENABLE );    //Ê¹ÄÜADC1Í¨µÀÊ±ÖÓ
11     
12     RCC_ADCCLKConfig(RCC_PCLK2_Div6); //ÉèÖÃADC·ÖÆµÒò×Ó6 72M/6=12,ADC×î´óÊ±¼ä²»ÄÜ³¬¹ý14M
13 
14     //PB0 ×÷ÎªÄ£ÄâÍ¨µÀÊäÈëÒý½Å 
15     
16     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
17     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;        //Ä£ÄâÊäÈëÒý½Å
18     GPIO_Init(GPIOB, &GPIO_InitStructure);    
19 
20     ADC_DeInit(ADC1);  //¸´Î»ADC1,½«ÍâÉè ADC1 µÄÈ«²¿¼Ä´æÆ÷ÖØÉèÎªÈ±Ê¡Öµ
21     
22     ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;    //ADC¹¤×÷Ä£Ê½:ADC1ºÍADC2¹¤×÷ÔÚ¶ÀÁ¢Ä£Ê½
23     ADC_InitStructure.ADC_ScanConvMode = DISABLE;    //Ä£Êý×ª»»¹¤×÷ÔÚµ¥Í¨µÀÄ£Ê½
24     ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;    //Ä£Êý×ª»»¹¤×÷ÔÚµ¥´Î×ª»»Ä£Ê½
25     ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;    //×ª»»ÓÉÈí¼þ¶ø²»ÊÇÍâ²¿´¥·¢Æô¶¯
26     ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;    //ADCÊý¾ÝÓÒ¶ÔÆë
27     ADC_InitStructure.ADC_NbrOfChannel = 1;    //Ë³Ðò½øÐÐ¹æÔò×ª»»µÄADCÍ¨µÀµÄÊýÄ¿
28     ADC_Init(ADC1, &ADC_InitStructure);    //¸ù¾ÝADC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯ÍâÉèADCxµÄ¼Ä´æÆ÷   
29  
30     ADC_Cmd(ADC1, ENABLE);    //Ê¹ÄÜÖ¸¶¨µÄADC1
31     
32     ADC_ResetCalibration(ADC1);    //Ê¹ÄÜ¸´Î»Ð£×¼  
33      
34     while(ADC_GetResetCalibrationStatus(ADC1));    //µÈ´ý¸´Î»Ð£×¼½áÊø
35     
36     ADC_StartCalibration(ADC1);     //¿ªÆôADÐ£×¼
37  
38     while(ADC_GetCalibrationStatus(ADC1));     //µÈ´ýÐ£×¼½áÊø
39     
40 }
41 
42 u16 GetADCValue(u8 chose)
43 {
44     ADC_RegularChannelConfig(ADC1, chose, 1, ADC_SampleTime_239Cycles5 );    //ADC1,ADCÍ¨µÀ,²ÉÑùÊ±¼äÎª239.5ÖÜÆÚ                      
45   
46     ADC_SoftwareStartConvCmd(ADC1, ENABLE);        //Ê¹ÄÜÖ¸¶¨µÄADC1µÄÈí¼þ×ª»»Æô¶¯¹¦ÄÜ    
47      
48     while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//µÈ´ý×ª»»½áÊø
49 
50     return ADC_GetConversionValue(ADC1);    //·µ»Ø×î½üÒ»´ÎADC1¹æÔò×éµÄ×ª»»½á¹û
51     
52 }

C文件

1 #ifndef __ADC_H
2 #define __ADC_H    
3 
4 #include "sys.h"
5 void ADCInit(void);
6 u16  GetADCValue(u8 chose); 
7 
8 #endif

H文件

 1                         #include "sys.h"
 2                         #include "usart.h"
 3                         #include "delay.h"
 4                         #include "ADC.h"
 5                         
 6 #define LED0 PAout(8)// DS0
 7 #define LED1 PBout(1)// DS1    
 8 #define LED2 PBout(3)// DS1
 9 #define LED3 PAout(11)// DS1    
10 
11 
12 
13                     int main(void)
14                     {    
15                         
16                         u16 WADC;
17                         float fadc;            
18                         Stm32_Clock_Init(9); 
19                         delay_init(72); 
20                         uart_init(); 
21               ADCInit();
22                         while(1)
23                         {                
24                          WADC =    GetADCValue(ADC_Channel_8);
25                          fadc =(float)WADC*(3.3/4096);
26                          printf("V1-2 adc : %f \r\n",fadc);
27                          delay_ms(1000);                
28                         }
29                         return 0;
30                         
31                     }
32                         
33                         
34                         
35

main

stm32片上ADC转换实验

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