STM32F103多通道AD转换时为什么3通道就出错了

Boolean · 发表于 2018-5-10 20:01:16

#include "delay.h"
#include "ADC.h"
// #define ADC1_DR_Address ((u32)0X40012400+0x4c)
__IO uint16_t ADC_Con[4];
//3õê¼»ˉADC
//ÕaàïÎòÃÇ½öòÔ1æÔòí¨μàÎaày
//ÎòÃÇÄ¬èÏ½«¿aÆôí¨μà0~3
void  Adc_Init(void)
{

ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1 , ENABLE );    //sh

RCC_ADCCLKConfig(RCC_PCLK2_Div6); //éèÖÃADC·ÖÆμòò×ó6 72M/6=12,ADC×î′óê±¼ä2»Äü3¬1y14M

//PA1 ×÷ÎaÄ￡Äaí¨μàêäèëòy½Å
//GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //Ä￡Äaêäèëòy½Å
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_DeInit(ADC1);  //¸′Î»ADC1,½«íaéè ADC1 μÄè«2¿¼Ä′æÆ÷ÖØéèÎaè±ê¡Öμ
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC1¤×÷Ä￡ê½:ADC1oíADC21¤×÷Ôú¶àá￠Ä￡ê½
ADC_InitStructure.ADC_ScanConvMode = ENABLE; //Ä￡êy×a»»1¤×÷Ôú¶àí¨μà
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //Ä￡êy×a»»1¤×÷Ôú¶à′Î×a»»Ä￡ê½
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //×a»»óéèí¼t¶ø2»êÇía2¿′￥·￠Æô¶ˉ3
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADCêy¾Yóò¶ÔÆë
ADC_InitStructure.ADC_NbrOfChannel = 2; //Ë3Dò½øDD1æÔò×a»»μÄADCí¨μàμÄêyÄ¿
ADC_Init(ADC1, &ADC_InitStructure); //¸ù¾YADC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèADCxμÄ¼Ä′æÆ÷
  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5 ); //ADC1,ADCí¨μà,2éÑùê±¼äÎa239.5ÖüÆú
  ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_239Cycles5 );
//ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_239Cycles5 );
ADC_Cmd(ADC1, ENABLE); //ê1ÄüÖ¸¶¨μÄADC1
ADC_ResetCalibration(ADC1); //ê1Äü¸′Î»D￡×¼
while(ADC_GetResetCalibrationStatus(ADC1)); //μè′y¸′Î»D￡×¼½áêø
ADC_StartCalibration(ADC1);    //¿aÆôADD￡×¼
while(ADC_GetCalibrationStatus(ADC1));    //μè′yD￡×¼½áêø
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //ê1ÄüÖ¸¶¨μÄADC1μÄèí¼t×a»»Æô¶ˉ1|Äü
}
//»ñμÃADCÖμ
//ch:í¨μàÖμ 0~3
u16 Get_Adc(u8 ch)
{ u32 temp_val;
//int i;
    //éèÖÃÖ¸¶¨ADCμÄ1æÔò×éí¨μà￡¬ò»¸öDòáD￡¬2éÑùê±¼ä
    ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 ); //ADC1,ADCí¨μà,2éÑùê±¼äÎa239.5ÖüÆú
   ADC_SoftwareStartConvCmd(ADC1, ENABLE);
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//μè′y×a»»½áêø
   temp_val=ADC_GetConversionValue(ADC1);
   //return ADC_GetConversionValue(ADC1); //·μ»ØÆ½¾ùÖμ
return temp_val;
}