ADC采样只显示3个0不变，这是什么问题

gdyx778 · 发表于 2020-10-22 17:06:44

adc.c
static void ADC_GPIO_Config(void)
{
GPIO_InitTypeDef gpio;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
gpio.GPIO_Pin=GPIO_Pin_7;
gpio.GPIO_Mode=GPIO_Mode_AIN;
GPIO_Init(GPIOA,&gpio);

}

static void ADC_Mode_Config(void)
{
ADC_InitTypeDef adc;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2,ENABLE);
adc.ADC_Mode=ADC_Mode_Independent;
adc.ADC_ScanConvMode=DISABLE;
adc.ADC_ContinuousConvMode=ENABLE;
adc.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None;
adc.ADC_DataAlign=ADC_DataAlign_Right;
adc.ADC_NbrOfChannel=1;
ADC_Init(ADC2,&adc);
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
ADC_RegularChannelConfig(ADC2,ADC_Channel_7,1,ADC_SampleTime_55Cycles5);
ADC_ITConfig(ADC2,ADC_IT_EOC,ENABLE);
ADC_Cmd(ADC2,ENABLE);
ADC_ResetCalibration(ADC2);
while (ADC_GetResetCalibrationStatus(ADC2));
ADC_StartCalibration(ADC2);
while(ADC_GetCalibrationStatus(ADC2));
ADC_SoftwareStartConvCmd(ADC2,ENABLE);

}

static void ADC_NVIC_Config(void)
{
NVIC_InitTypeDef nvic;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
nvic.NVIC_IRQChannel=ADC1_2_IRQn;
nvic.NVIC_IRQChannelPreemptionPriority=1;
nvic.NVIC_IRQChannelSubPriority=1;
nvic.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&nvic);

}

uint16_t ADC_ConvertedValue;

void ADC1_2_IRQHandler(void)
{
if(ADC_GetITStatus(ADC2,ADC_IT_EOC)==SET)
{
ADC_ConvertedValue=ADC_GetConversionValue(ADC2);
}

ADC_ClearITPendingBit(ADC2,ADC_IT_EOC);

}

void ADCx_Init(void)
{
ADC_GPIO_Config();
ADC_Mode_Config();
ADC_NVIC_Config();
}
main.c
#include "stm32f10x.h"

extern uint16_t ADC_ConvertedValue;
uint16_t ADC_ConvertedValueLocal;
uint16_t ge,yi,er;

int main(void)
{
SystemInit();
delay_init(72);
USART_Config_Init();
ADCx_Init();
LCD_Init();

ADC_ConvertedValueLocal=(float) (ADC_ConvertedValue/4096)*3.3;
ge=(ADC_ConvertedValueLocal*100)/100+48;
yi=(ADC_ConvertedValueLocal*100)%100/10+48;
er=(ADC_ConvertedValueLocal*100)%10+48;

PutGB1632(0,0*16,ge,BLACK,WHITE);
PutGB1632(0,1*16,'.',BLACK,WHITE);
PutGB1632(0,2*16,yi,BLACK,WHITE);
PutGB1632(0,3*16,er,BLACK,WHITE);

while(1)
{

}
}