[General] Code Error in keil....

[gauravkothari23]

Hi friends....
plz help me
as i am new for programming...
i wrote the code in c but am getting an error in keil as

Project1.c(19): warning C206: 'Lcd8_Cmd': missing function-prototype
Project1.c(19): error C267: 'Lcd8_Cmd': requires ANSI-style prototype...

my code is......

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#include<reg51.h>
#include<delay.h>
#include<lcd.h>
#include<keypad.h>
 
void lcd_cmd(unsigned char );
void lcddata(unsigned char );
void lcdready();
void MSDelay(unsigned int );
sbit LEDg=P2^4;
sbit LEDr=P2^3;
 
//// FUNCTIONS FOR LOCK image on LCD////
void lock()
{
Lcd8_Cmd(72);
Lcd8_Write_Char(0);
Lcd8_Write_Char(14);
Lcd8_Write_Char(10);
Lcd8_Write_Char(10);
Lcd8_Write_Char(31);
Lcd8_Write_Char(27);
Lcd8_Write_Char(31);
Lcd8_Cmd(0xcf);
Lcd8_Write_Char(1);
 
}
void open()
{
Lcd8_Cmd(72);
Lcd8_Write_Char(14);
Lcd8_Write_Char(10);
Lcd8_Write_Char(2);
Lcd8_Write_Char(2);
Lcd8_Write_Char(31);
Lcd8_Write_Char(27);
Lcd8_Write_Char(31);
Lcd8_Cmd(0xcf);
Lcd8_Write_Char(1);
}
 
//// FUNCTION INPUTTING VALES FROM USERS AND STORING THEM TO AN ARRAY////
void input(char arr[])
{ unsigned char i=0,k=0,N[16];
Lcd8_Cmd(0xc0);
while(k!='#')
{
k=Read_Keypad();
if(k && k!='#')
{
N[i++]=k;
Lcd8_Write_Char('*');
}
}
strcpy(arr,N);
arr[i]='\0';
}
 
void main()
{
unsigned char P[16]={"000"}; ///default password
 
while(1)
{ unsigned char p[16],s[16],j;
 
LEDg=0;LEDr=1;
Lcd8_Init();
lock();
Lcd8_Cmd(0x80);
Lcd8_Write_String("ENTER PASSWORD");
input(p);
 
if(strcmp(p,P)==0)
{
Lcd8_Init();
open();
Lcd8_Cmd(0x80);
Lcd8_Write_String("ACCESS GRANTED");
LEDr=0;LEDg=1;
while(Read_Keypad()!='#')
{}
}
else if(strcmp(p,"*")==0)
{
Lcd8_Init();
lock();
Lcd8_Cmd(0x80);
Lcd8_Write_String("CURRENT PASSWORD");
input(p);
 
if(strcmp(p,P)==0)
{
Lcd8_Init();
lock();
Lcd8_Cmd(0x80);
Lcd8_Write_String("NEW PASSWORD");
input(s);
 
Lcd8_Init();
lock();
Lcd8_Cmd(0x80);
Lcd8_Write_String("CONFIRM PASSWORD");
input(p);
 
if(strcmp(p,s)==0)
{ j=strlen(s);
strcpy(P,s);
P[++j]='\0';
Lcd8_Init();
lock();
Lcd8_Cmd(0x80);
Lcd8_Write_String("CHANGE");
Lcd8_Cmd(0xc0);
Lcd8_Write_String("SUCCESSFULL");
while(Read_Keypad()!='#')
{}
}
else
{
Lcd8_Init();
lock();
Lcd8_Cmd(0x80);
Lcd8_Write_String("CHANGE");
Lcd8_Cmd(0xc0);
Lcd8_Write_String("UNSUCCESSFULL");
while(Read_Keypad()!='#')
{}
}
}
else
{
Lcd8_Init();
lock();
Lcd8_Cmd(0x80);
Lcd8_Write_String("WRONG PASSWORD");
delay_msec(2000);
}
}
else
{
Lcd8_Init();
lock();
Lcd8_Cmd(0x80);
Lcd8_Write_String("ACCESS DENIED");
LEDr=0;delay_msec(250); LEDr=1;delay_msec(250);
LEDr=0;delay_msec(250);
LEDr=1;delay_msec(250);
LEDr=0;delay_msec(250);
LEDr=1;delay_msec(250);
}
}
}
 
 
 
----------------------------------------------------------------------------------
 
CODE (delay.h)
 
----------------------------------------------------------------------------------
void delay_msec(int time)
{int i=0;
while(i<time)
{TMOD=0x10;
TH1=0xfc;
TL1=0x65;
TR1=1;
while(TF1==0);
TR1=0;
TF1=0;
i++;
}
}
 
 
--------------------------------------------------------------------------------------
CODE (lcd.h)
--------------------------------------------------------------------------------------
#include<string.h>
//LCD Module Connections
sbit RS=P2^0;
sbit RW=P2^1;
sbit E=P2^2;
//End LCD Module Connections
 
char *string;
//LCD 8 Bit Interfacing Functions
 
void Lcd8_Cmd(unsigned char value)
{
P3=value;
RS=0;
RW=0;
E=1;
delay_msec(1);
E=0;
}
 
void Lcd8_Init()
{
Lcd8_Cmd(0x38); //function set
Lcd8_Cmd(0x0C); //display on,cursor off,blink off
Lcd8_Cmd(0x01); //clear display
Lcd8_Cmd(0x06); //entry mode, set increment
}
 
void Lcd8_Write_Char(unsigned char value)
{
 
P3=value;
RS=1;
RW=0;
E=1;
delay_msec(1);
E=0;
}
 
void Lcd8_Write_String(char *a)
{
int i;
string=a;
for(i=0;a[i]!='\0';i++)
Lcd8_Write_Char(a[i]);
}
 
void Lcd8_Shift_Right()
{ int j;
for(j=0;j<strlen(string);j++)
{Lcd8_Cmd(0x1C);delay_msec(100);}
}
 
void Lcd8_Shift_Left()
{ int k;
for(k=0;k<strlen(string);k++)
{Lcd8_Cmd(0x18);delay_msec(100);}
}
 
 
 
------------------------------------------------------------------------------
CODE (keypad.h)
 
------------------------------------------------------------------------------
sbit R1 = P1^0;
sbit R2 = P1^1;
sbit R3 = P1^2;
sbit R4 = P1^3;
 
sbit C1 = P1^4;
sbit C2 = P1^5;
sbit C3 = P1^6;
sbit C4 = P1^7;
 
//End Keypad Connections
 
char Read_Keypad()
{
C1=C2=C3=C4=1;
 
R1=0;
R2=1;
R3=1;
R4=1;
if(C1==0){while(C1==0);return '1';}
if(C2==0){while(C2==0);return '2';}
if(C3==0){while(C3==0);return '3';}
if(C4==0){while(C4==0);return 'A';}
R1=1;
R2=0;
R3=1;
R4=1;
if(C1==0){while(C1==0);return '4';}
if(C2==0){while(C2==0);return '5';}
if(C3==0){while(C3==0);return '6';}
if(C4==0){while(C4==0);return 'B';}
R1=1;
R2=1;
R3=0;
R4=1;
if(C1==0){while(C1==0);return '7';}
if(C2==0){while(C2==0);return '8';}
if(C3==0){while(C3==0);return '9';}
if(C4==0){while(C4==0);return 'C';}
R1=1;
R2=1;
R3=1;
R4=0;
if(C1==0){while(C1==0);return '*';}
if(C2==0){while(C2==0);return '0';}
if(C3==0){while(C3==0);return '#';}
if(C4==0){while(C4==0);return 'D';}
return 0;
}

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[Gorgon]

You need to define the function prototype before you call the function the first time.

Normally this is done in the appropriate header file you include in the start of the xxx.c file. The abc.h file includes normally only definitions and prototypes, and the abc.c file the code part of the functions.

 

[gauravkothari23]

Thanks a lot for reply....
but am sorry am not getting your points....
can u plz... make it bit clearly...

 

[andre_luis]

am not getting your points

As Gorgon mentioned, as a good practice you should put the prototype at a separate file, but for keep testing, in order to eliminate current errors from compilation, could make some fixes:

At line 5, insert the code bellow :

void Lcd8_Write_Char(unsigned char value);

At line 259, you wrote something that I guess is not allowed in ansi-c:

C1=C2=C3=C4=1;

 

[gauravkothari23]

Thanks a lot....
I have don the changes.. but again i am getting an error.... saying that...
msdelay.... not in a formal parameter list....
what does it mean....
plzz help me....

- - - Updated - - -

thanks a lot....
but again i am getting an error saying that.....
msdelay... not in a formal parameter list....
what does it mean... and what is the solution....
plzz. help me....

 

[andre_luis]

Follow these steps :

• Open the file delay.h
• Look on it for the function delay_msec
• Insert the prototype for this function at beggining of the code.