can not compile lcd code in keil

[Parth]

 

  #include<reg52.h>

#include<intrins.h>

#include<string.h>

#define LCD P0

#define DELAY _nop_();

void integer_lcd(int);

sbit m1=P2^2;

sbit op=P2^3;

sbit time=P2^0;

void init_lcd(void);

void cmd_lcd(unsigned char);

void data_lcd(unsigned char*);

unsigned int i,n;

void delay_ms(int);

void main()

{

 init_lcd();

m1=0;

time=1;

op=0;

n=10;

display_lcd(“Foot Step Based”);

cmd_lcd(0xC0);

display_lcd(“Street Light”);

delay_ms(100);

cmd_lcd(0x01);

while(1)

{

cmd_lcd(0x80);

display_lcd(“Foot Step Based”);

cmd_lcd(0xC0);

display_lcd(“Street Light”);

 

if(m1=1)

{

cmd_lcd(0x01);

cmd_lcd(0x80);

display_lcd(“Stepped”);

 cmd_lcd(0xC0);

  display_lcd(“Light ON “);

for(i=0;i<=n;i++)

{  

cmd_lcd(0xc0);

display_lcd(“Time: 00:”);

integer_lcd(i);

op=1;

delay_ms(250);

}

   i=0;

op=0;

}

if(time==0)

{

   cmd_lcd(0x01);

cmd_lcd(0x80);

display_lcd(“Set Time”);

  cmd_lcd(0xC0);

  display_lcd(”              “);

   n=n+1;

   integer_lcd(n);

}

}

} 

void init_lcd(void)

{

  cmd_lcd(0x28);

  cmd_lcd(0x28);

  cmd_lcd(0x28);

  cmd_lcd(0x0C);

  cmd_lcd(0x06);

  cmd_lcd(0x01);

}

void cmd_lcd(unsigned char var)

{

  LCD = ((var& 0xF0) | 0x04);

  LCD = 0;

  LCD = ((var<< 4) | 0x04);

  LCD = 0;

  delay_ms(2);

}

void data_lcd(unsigned char var)

{

  LCD = ((var& 0xF0) | 0x05);

  LCD = 0;

  LCD = ((var<< 4) | 0x05);

  LCD = 0;

  delay_ms(2);

}  

void display_lcd(char *str)

{

  while(*str)

  data_lcd(*str++);

}

void delay_ms(intcnt)

{

  int i;

  while(cnt–)

  for(i=0;i<500;i++);

}

void integer_lcd(int n)

{

unsigned char c[6];

unsigned int i=0;

if(n<0)

{

data_lcd(‘-‘);

n=-n;

}

if(n==0)

data_lcd(‘0’);

while(n>0)

{

c[i++]=(n%10)+48;

n/=10;

}

while(i–>=1)

data_lcd(c);

}

 

 

 

 

 

pls help me

[Savio]

Hey Parth,

 

It would be very helpfull if you could post your code with comments explaining the steps taken by you.

I assume you are using LCD in 4-bit mode. If so, initialize the LCD in 4-bit mode with command 0x02.

I have faced problems using KEIL while using ” #define LCD P0;”. Instead i’ve used “sfr P0=LCD;”.

 

Hope you solve your problem,

Regards.

[AJISH ALFRED]

Hi Parth,

Please post your ‘error dialogue’ so that we can have a better idea about the issue.

[Parth]

i have one error and warning

warning C206 :- ‘display_lcd’ missing function prototype

erroe C267 :_ ‘display_lcd’ require ANSI-style prototype

[Savio]

Regarding warning, you are missing a few function prototypes. Mention all the funtions used in your program before the ‘main()’ funtion. i.e. ” void display_lcd(unsigned char *str);”

 

Regarding error, this is a code which I usually use,

 

void display_lcd(unsigned char *str)

{

     while(*str!=0)

             {   

                  data_lcd(*str);

                  str++;

              }

}

 

Hope this helps, good Luck.

 

[Gopi.g]

Hi,

 

Parth,

 

I think your program is correct. once check 10 k preset (most important for 2*16 lcd display).

 

Thanks.

[Author]

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