关于 error:unxefined symbol的问题

三尺飒沓 · 发表于 2018-6-20 11:55:27

本帖最后由三尺飒沓于 2018-6-20 14:59 编辑

..\OBJ\Template.axf: Error: L6218E: Undefined symbol DHT22_Read_Data (referred from main.o).
..\OBJ\Template.axf: Error: L6218E: Undefined symbol DHT22_Read_Bit (referred from dht22.o).
..\OBJ\Template.axf: Error: L6218E: Undefined symbol DHT22_Read_Byte (referred from dht22.o).

用的dht22温湿度传感器与dht11原理相同，参照dht11的实验结构写的，这几个函数都定义了，也包含头文件了，还是提示这个错误
main.c文件如下
#include "usart.h"
#include "led.h"
#include "delay.h"
#include "dht22.h"
#include "sys.h"

int main(void)
{
      u8 t=0;
      u8 temperature1,temperature2;
      u8 humidity1,humidity2;
            NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      uart_init(115200);
      delay_init();
      led_Init();
      while(DHT22_Init())       {}
      while(1)
      {
               if(t%10==0)
            {
                     DHT22_Read_Data(&temperature1,&temperature2,&humidity1,&humidity2);
                     printf("温度：%d.%d\r\n",temperature1,temperature2);
                     printf("湿度：%d.%d\r\n",humidity1,humidity2);
            }
               delay_ms(10);
            t++;
            if(t==20)
            {
                     t=0;
                     led0=!led0;
            }
      }
}

dht22.h文件如下
#ifndef _dht22_H
#define _dht22_H
#include "sys.h"
#define DHT22_IO_IN()  {GPIOG->CRH&=0xFFFF0FFF;GPIOG->CRH|=8<<12;}
#define DHT22_IO_OUT() {GPIOG->CRH&=0xFFFF0FFF;GPIOG->CRH|=3<<12;}
#define DHT22_DQ_IN PGin(11)
#define DHT22_DQ_OUT PGout(11)

u8 DHT22_Init(void);
u8 DHT22_Read_Data(u8 *temp1,u8 *temp2,u8 *humi1,u8 *humi2);
u8 DHT22_Read_Byte(void);
u8 DHT22_Read_Bit(void);
u8 DHT22_Check(void);
void DHT22_Rst(void);
#endif

dht22.c文件如下
#include "dht22.h"
#include "delay.h"

void DHT22_Rst(void)
{
      DHT22_IO_OUT();
      DHT22_DQ_OUT=0;
      delay_us(700);
      DHT22_DQ_OUT=1;
      delay_us(30);
}

u8 DHT22_Check(void)
{
      u8 retry=0;
      DHT22_IO_IN();
      while(DHT22_DQ_IN&&retry<90)
      {
            retry++;
            delay_us(1);
      }
      if(retry>=90)return 1;
      else retry=0;
      while(!DHT22_DQ_IN&&retry<90)
      {
            retry++;
            delay_us(1);
      }
      if(retry>=90)return 1;
      return 0;
}

u8 DHT22_ReadBit(void)
{
            u8 retry=0;
      while(DHT22_DQ_IN&&retry<100)
      {
            retry++;
            delay_us(1);
      }
      retry=0;
      while(!DHT22_DQ_IN&&retry<100)
      {
            retry++;
            delay_us(1);
      }
      delay_us(40);
      if(DHT22_DQ_IN)return 1;
      else return 0;
}

u8 DHT22_ReadByte(void)
{
      u8 i,dat;
dat=0;
      for (i=0;i<8;i++)
      {
               dat<<=1;
         dat|=DHT22_Read_Bit();
}
return dat;
}

u8 DHT22_ReadData(u8 *temp1,u8 *temp2,u8 *humi1,u8 *humi2)
{
      u8 buf[5];
      u8 i;
      DHT22_Rst();
      if(DHT22_Check()==0)
      {
            for(i=0;i<5;i++)
            {
                     buf=DHT22_Read_Byte();
            }
            if((buf[0]+buf[1]+buf[2]+buf[3])==buf[4])
            {
                     *humi1=buf[0];
                     *humi2=buf[1];
                     *temp1=buf[2];
                     *temp2=buf[3];
            }
      }else return 1;
      return 0;
}

u8 DHT22_Init(void)
{
      GPIO_InitTypeDef  GPIO_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOG, ENABLE);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOG, &GPIO_InitStructure);
      GPIO_SetBits(GPIOG,GPIO_Pin_11);

      DHT22_Rst();
      return DHT22_Check();

}