哪位大哥給解釋一下警告什么意思呢？新人求助

ID:180790 · 發(fā)表于 2017-3-27 16:16

#include<reg51.h>
#include<intrins.h>
#define BYTE unsigned char
typedef unsigned int WORD;
#define URMD 0
sfr T2H=0xd6;
sfr T2L=0xd7;
sfr AUXR=0x8e;
sfr ADC_CONTR=0xBC;
sfr ADC_RES=0xBD;
sfr ADC_LOW2=0xBE;
sfr P1ASF=0x9D;
#define       ADC_POWER 0x80
#define       ADC_FLAG 0x10
#define       ADC_START 0x08
#define       ADC_SPEEDLL 0x00
#define       ADC_SPEEDL 0x20
#define       ADC_SPEEDH  0x40
#define ADC_SPEEDHH 0x60
void InitUart();
void SendData(BYTE dat);
void Delay(WORD n);
void InitADC();
BYTE    ch=0;
void main()
{
  InitUart();
  InitADC();
  IE=0xa0;
  while(1);
  }
void adc_isr()interrupt 5 using 1
{
   ADC_CONTR&=!ADC_FLAG;
      SendData(ADC_RES);
      ADC_CONTR=0xea;
      }
      void InitADC()
      {
         P1ASF=0xff;
            ADC_RES=0;
            ADC_CONTR=ADC_POWER|ADC_SPEEDHH|ADC_START|ch;
            Delay(2);
            }
            void InitUart()
            {
               SCON=0x5a;
               T2L=0xea;
               T2H=0xff;
               AUXR=0x14;
               AUXR|=0x01;
               }
               void SengData(BYTE dat)
               {
                  while(!TI);
                     TI=0;
                     SBUF=dat;
                     }
                     void Delay(WORD n)
                     {
                        WORD x;
                        while(n--)
                        {
                        x=5000;
                              while(x--);
                              }
            }
這是錯(cuò)誤的提示：
   Build target 'Target 1'
compiling w.c...
linking...
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?_SENGDATA?W
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL:  _SENDDATA
MODULE:  w.obj (W)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL:  _SENDDATA
MODULE:  w.obj (W)
ADDRESS: 089FH
Program Size: data=18.0 xdata=0 code=266
"w" - 0 Error(s), 3 Warning(s).