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

 #include "ADC.h"

 void ADCInit(void)

 {

     ADC_InitTypeDef ADC_InitStructure;

     GPIO_InitTypeDef GPIO_InitStructure;

     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB |RCC_APB2Periph_ADC1, ENABLE );    //ʹÄÜADC1ͨµÀʱÖÓ

     RCC_ADCCLKConfig(RCC_PCLK2_Div6); //ÉèÖÃADC·ÖƵÒò×Ó6 72M/6=12,ADC×î´óʱ¼ä²»Äܳ¬¹ý14M

     //PB0 ×÷ΪģÄâͨµÀÊäÈëÒý½Å

     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;

     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;        //Ä£ÄâÊäÈëÒý½Å

     GPIO_Init(GPIOB, &GPIO_InitStructure);

     ADC_DeInit(ADC1);  //¸´Î»ADC1,½«ÍâÉè ADC1 µÄÈ«²¿¼Ä´æÆ÷ÖØÉèΪȱʡֵ

     ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;    //ADC¹¤×÷ģʽ:ADC1ºÍADC2¹¤×÷ÔÚ¶ÀÁ¢Ä£Ê½

     ADC_InitStructure.ADC_ScanConvMode = DISABLE;    //Ä£Êýת»»¹¤×÷ÔÚµ¥Í¨µÀģʽ

     ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;    //Ä£Êýת»»¹¤×÷ÔÚµ¥´Îת»»Ä£Ê½

     ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;    //ת»»ÓÉÈí¼þ¶ø²»ÊÇÍⲿ´¥·¢Æô¶¯

     ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;    //ADCÊý¾ÝÓÒ¶ÔÆë

     ADC_InitStructure.ADC_NbrOfChannel = ;    //˳Ðò½øÐйæÔòת»»µÄADCͨµÀµÄÊýÄ¿

     ADC_Init(ADC1, &ADC_InitStructure);    //¸ù¾ÝADC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèADCxµÄ¼Ä´æÆ÷

     ADC_Cmd(ADC1, ENABLE);    //ʹÄÜÖ¸¶¨µÄADC1

     ADC_ResetCalibration(ADC1);    //ʹÄܸ´Î»Ð£×¼

     while(ADC_GetResetCalibrationStatus(ADC1));    //µÈ´ý¸´Î»Ð£×¼½áÊø

     ADC_StartCalibration(ADC1);     //¿ªÆôADУ׼

     while(ADC_GetCalibrationStatus(ADC1));     //µÈ´ýУ׼½áÊø

 }

 u16 GetADCValue(u8 chose)

 {

     ADC_RegularChannelConfig(ADC1, chose, , ADC_SampleTime_239Cycles5 );    //ADC1,ADCͨµÀ,²ÉÑùʱ¼äΪ239.5ÖÜÆÚ

     ADC_SoftwareStartConvCmd(ADC1, ENABLE);        //ʹÄÜÖ¸¶¨µÄADC1µÄÈí¼þת»»Æô¶¯¹¦ÄÜ

     while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//µÈ´ýת»»½áÊø

     return ADC_GetConversionValue(ADC1);    //·µ»Ø×î½üÒ»´ÎADC1¹æÔò×éµÄת»»½á¹û

 }

C文件

 #ifndef __ADC_H

 #define __ADC_H

 #include "sys.h"

 void ADCInit(void);

 u16  GetADCValue(u8 chose);

 #endif 

H文件

                         #include "sys.h"

                         #include "usart.h"

                         #include "delay.h"

                         #include "ADC.h"

 #define LED0 PAout(8)// DS0

 #define LED1 PBout(1)// DS1

 #define LED2 PBout(3)// DS1

 #define LED3 PAout(11)// DS1

                     int main(void)

                     {

                         u16 WADC;

                         float fadc;

                         Stm32_Clock_Init();

                         delay_init();

                         uart_init();

               ADCInit();

                         while()

                         {

                          WADC =    GetADCValue(ADC_Channel_8);

                          fadc =(float)WADC*(3.3/);

                          printf("V1-2 adc : %f \r\n",fadc);

                          delay_ms();

                         }

                         return ;

                     }

main