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i am using keil version 3 for writing my code in embedded c..
it shows me 19 warnings..and i dont know how to solve these..please anyone help in solving this..
it shows warnings like this…
Build target ‘Target 1’compiling finalcode.c…linking…*** WARNING L1: UNRESOLVED EXTERNAL SYMBOLSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0ACAH*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0AD6H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0AFDH*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C11H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C19H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C2DH*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C45H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C4DH*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C61H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C79H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C81H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0C95H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0D5BH*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0D63H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0CDFH*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0CEBH*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0CF7H*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNALSYMBOL: _LCDCMDMODULE: finalcode.obj (FINALCODE)ADDRESS: 0D03HProgram Size: data=115.0 xdata=0 code=1470creating hex file from “finalcode”…“finalcode” – 0 Error(s), 19 Warning(s).this is the code..
#include<absacc.h>#include<reg52.h>sbit rs=P2^0;sbit rw=P2^1;sbit e=P2^2;unsigned char c[11];// to receive tag Idconst unsigned char Tag1[11]= {‘0′,’0′,’1′,’5′,’3′,’9′,’7′,’6′,’5′,’1’};// to store tag numbersconst unsigned char Tag2[11]= {‘0′,’0′,’1′,’5′,’3′,’9′,’7′,’6′,’5′,’0’};const unsigned char Tag3[11]= {‘0′,’0′,’1′,’5′,’3′,’9′,’4′,’7′,’9′,’8’};unsigned int bn; // to store bus numberunsigned char area[4];// to store area numberunsigned int n=11; // no. of bytes in tag idvoid delay(unsigned int );void lcdinit(void);void rtcinit(void);void lcdcmd(unsigned char);void welcome(void);void receive(void);void bus1(void);void bus2(void);void bus3(void);void nomatch(void);void rtc(void);void bcdconv(unsigned char) ;void lcddata(unsigned char );void lcdstring(unsigned char * );void main(){unsigned int i;unsigned int v1,v2,v3,vn; // variables in switch casesTMOD=0x20;TH1=0xFD;SCON=0x50;TR1=1;lcdinit();delay(25);welcome();delay(25);while(1){receive(); // function to recieve tag id into arrayv1=v2=v3=vn=0;for(i=0;i<n;i++) // loop to compare the recieved tag and the id’s stored in tags{if(c==Tag1)v1++;elseif(c==Tag2)v2++;elseif(c==Tag3)v3++;elseif(c!=(Tag1&&Tag2&&Tag3))vn++;} // end of for loop//if value of any variable is n i.e., the number of bytes then the coresponding fumction is calledif(v1==n)bus1();elseif(v2==n)bus2();elseif(v3==n)bus3();elseif(vn==n)nomatch();//Function to initialize the Real Time Clock (RTC)rtcinit();delay(25);//Funtion to Obtain the Time From the RTCrtc();}// end of while loop}//end of main function// Welcome functionvoid welcome(){unsigned int i=0;unsigned char c[]=”WELCOME TO RFID”;unsigned char d[]=”BUS ID SYSTEM”;lcdcmd(0x01);delay(1);lcdcmd(0x80); //delay(1);for(i=0;c!=’ ’;i++)lcddata(c);lcdcmd(0xc0);delay(1);for(i=0;d!=’ ’;i++)lcddata(d);}// function to recieve the tag id from readervoid receive(){unsigned char t;for(t=0;t<n;t++){while(RI==0); //wait until value of RI is set to 1c[t]=SBUF; //load SBUF value into array ‘c’RI=0; //clear value of RI to 0}}// Function to send the details of bus 1void bus1(){lcdcmd(0x01);delay(10);lcdcmd(0x80);delay(10);lcdstring(“Bus Number : 1” );delay(10);lcdcmd(0xc0);delay(10);lcdstring(“Area : RJY”);delay(10);}//function to store area of bus 2void bus2(){lcdcmd(0x01);delay(10);lcdcmd(0x80);delay(10);lcdstring(“Busnumber : 2” );delay(10);lcdcmd(0xc0);delay(10);lcdstring(“Area : KKD”);delay(10);}//Function to store Bus 3 detailsvoid bus3(){lcdcmd(0x01);delay(10);lcdcmd(0x80);delay(10);lcdstring(“Busnumber : 3” );delay(10);lcdcmd(0xc0);delay(10);lcdstring(“Area : ABC”);delay(10);}//Function to display the unauthorized entry of buses into the arena of the collegevoid nomatch(){lcdcmd(0x01);delay(10);lcdcmd(0x80);lcdstring(“Unauthorised entry”);delay(10);}// function to display time from the RTcvoid rtc(){unsigned char hr,min,sec;hr=XBYTE[4];bcdconv(hr);delay(10);lcddata(‘:’);min=XBYTE[2];bcdconv(min);delay(10);lcddata(‘:’);sec=XBYTE[0];bcdconv(sec);}//Function to convert hex values into BCDvoid bcdconv(unsigned char v){unsigned char x,y;x=v&0x0F;x=x|0x03;y=v&0xF0;y=y>>4;y=y|0x30;lcddata(y);lcddata(x);}//LCD initialisation functionvoid lcdinit(){lcdcmd(0x38);delay(1);lcdcmd(0xE0);delay(1);lcdcmd(0x01);delay(1);lcdcmd(0x06);delay(1);}//function to display stringvoid lcdstring(unsigned char *str){int i=0;for( ;str!=’ ’;i++){lcddata(str);delay(1);}}// lcd function to display a single charactervoid lcddata(unsigned char value){P1 = value;rs= 1;rw=0;e=1;delay(1);e=0;}void lcdcmd(unsigned char value){P1 = value;rs= 0;rw=0;e=1;delay(1);e=0;}// Function to initialize the Real Time clockvoid rtcinit(){delay(200);XBYTE[10]=0x20; //turn ON the oscillatorXBYTE[11]=0x83;XBYTE[0]=0x55;XBYTE[2]=0x58;XBYTE[4]=0x16;XBYTE[7]=0x19;XBYTE[8]=0x10;XBYTE[9]=0x04;XBYTE[11]=0x03;}//Function to generate delayvoid delay(unsigned int count){unsigned int i,j;for(i=0;i<count;i++)for(j=0;j<1275;j++);}i couldnt find any mistake, so i copied the your entire code into my Keilproject, I didnt get any warninge messages. Hex file is sucessfull created
ok thank u so much..i need a help in the same code that the code is not applying for switch case..it is showing me an error..
i tried changing the second ifelse ladder with switchcase bt isnt working…could anyone help me with this
i think you have used SWITCH as follows-
switch(n)
{
case v1: statements;
case v2: statements;
case v3: statements;
case vn: statements;
default:
}
did you write code like above code?
if so then its WRONG because CASE identifiers should be CONSTANTs .
you cannot write “case v1” because ‘v1’ is a variable.
instead you can write as
……
case 11: statements;
case 12: statements;
…….
i hope you understand.
if you havesome time please check my blog
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