CHECK OUT MY C PROGRAM ON LCD AS THERE IS LITTLE MISTAKE

This topic has 14 replies, 9 voices, and was last updated 6 years, 4 months ago by justin.

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April 6, 2011 at 8:02 pm #3831

SaLMAN Ahmed Khan
Participant

THIS IS MY PROG THAT I HAVE MAKE FOR MY OWN PRACTICE BUT KEIL IS GIVING ERROR THAT I HAVE MENTIONED IN THE LAST KINDLY PLEASE QUOTE ME MY MISTAKE THAT IM DOING IN THIS PROGRAM

#include <reg51.h>

sfr ldata=0x90;

sbit rs=P2^0;

sbit rw=P2^1;

sbit en=P2^2;

void main()

{

lcd_cmd(0x38);

MSdelay(250);

lcd_cmd(0x0E);

MSdelay(250);

lcd_cmd(0x1);

MSdelay(250);

lcd_cmd(0x06);

MSdelay(250);

lcd_cmd(0x86);

MSdelay(250);

lcd_data('M'); // DATA

MSdelay(250);

lcd_data('D');

MSdelay(250);

lcd_data('E');

}

void lcd_cmd(unsigned char value)

{

ldata=value;

rs=0;

rw=0;

en=1;

MSdelay(1);

en=0;

return;

}

void lcd_data(unsigned char value)

{

ldata=value;

rs=1;

rw=0;

en=1;

MSdelay(1);

en=0;

return;

}

void MSdelay(unsigned int itime)

{

unsigned int i,j;

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

for (j=0; j<1275; j++);

}

April 7, 2011 at 2:10 am #5915

romel emperado
Participant

can you pls post the error..

April 11, 2011 at 7:31 pm #5944

SaLMAN Ahmed Khan
Participant

ERROR!!!!!::

Build target ‘Target 1’

compiling lcda.c…

LCDA.C(: warning C206: ‘lcd_cmd’: missing function-prototype

LCDA.C(: error C267: ‘lcd_cmd’: requires ANSI-style prototype

Target not created

April 11, 2011 at 9:46 pm #5945

romel emperado
Participant

here’s working example of code I am using..

// 4 bit example

#include<reg51.h>

#define LCD P1
#define LCD_EN        0x80
#define LCD_RS        0x20

//LCD Commands

#define LCD_SETMODE       0x04
#define LCD_SETVISIBLE       0x08
#define LCD_SETFUNCTION       0x28
#define LCD_SETDDADDR       0x80

void delayms(unsigned char);
void delayus(unsigned char);
void lcd_init();
void lcd_reset();
void lcd_cmd (char);
void lcd_data(unsigned char);
void lcd_str (unsigned char*);

void main (void)
{
lcd_init();
lcd_cmd(0x80);            // ist line address
lcd_str(”     i love “);
lcd_cmd(0xC0);              // 2nd line address
lcd_str(“romel”);
while(1);
}

void delayus(unsigned char delay){
    while(delay–);
}

void delayms(unsigned char delay){
    while(delay–)
        delayus(149);
}

void lcd_reset()
{
    LCD = 0xFF;
    delayms(40);
    LCD = 0x03+LCD_EN;
    LCD = 0x03;
    delayms(40);
    LCD = 0x03+LCD_EN;
    LCD = 0x03;
    delayms(5);
    LCD = 0x03+LCD_EN;
    LCD = 0x03;
    delayms(5);
    LCD = 0x02+LCD_EN;
    LCD = 0x02;
    delayms(5);
}

void lcd_init ()
{
    lcd_reset();
    lcd_cmd(LCD_SETFUNCTION);                    // 4-bit mode – 1 line – 5×7 font.
    lcd_cmd(LCD_SETVISIBLE+0x04);                // Display no cursor – no blink.
    lcd_cmd(LCD_SETMODE+0x02);                   // Automatic Increment – No Display shift.
    lcd_cmd(LCD_SETDDADDR);                      // Address DDRAM with 0 offset 80h.
}

void lcd_cmd (char cmd)
{
    LCD = ((cmd >> 4) & 0x0F)|LCD_EN;
    LCD = ((cmd >> 4) & 0x0F);

    LCD = (cmd & 0x0F)|LCD_EN;
    LCD = (cmd & 0x0F);

    delayus(250);
    delayus(250);
}

void lcd_data (unsigned char dat)
{
    LCD = (((dat >> 4) & 0x0F)|LCD_EN|LCD_RS);
    LCD = (((dat >> 4) & 0x0F)|LCD_RS);

    LCD = ((dat & 0x0F)|LCD_EN|LCD_RS);
    LCD = ((dat & 0x0F)|LCD_RS);

    delayus(250);
    delayus(250);
}

void lcd_str (unsigned char *str)
{
    while(*str){
        lcd_data(*str++);
    }
}

April 12, 2011 at 3:19 pm #5948

SaLMAN Ahmed Khan
Participant

but what specific error it has why it is giving????

April 12, 2011 at 3:29 pm #5949
romel emperado
Participant
```
WARNING 206: MISSING FUNCTION PROTOTYPE
```
ANSWER

The called function is unknown because no prototype declaration exists. Calls to unknown functions risk that the number of parameters may not correspond to the actual requirements. If this is the case, the function is called incorrectly.

The compiler has no way to check for missing or excessive parameters and their types. Include prototypes of the functions used in your program. Prototypes must be specified before the functions are actually called. The definition of a function automatically produces a prototype.
```
Error C267: 'function': requires ANSI-style prototype
```
What does this message mean?

ANSWER

This error message indicates that the function you are defining was prototyped with an empty parameter list but the definition includes parameters. Your function prototypes must match your function definitions. Find the prototype and either remove it or update it so that its arguments match that of the definition and everything will work OK.
April 12, 2011 at 3:30 pm #5950

romel emperado
Participant

use my code instead..

April 13, 2011 at 3:59 am #5953

piyush
Participant

simply copy and paste below three function above main

void lcd_cmd(unsigned char value);

void lcd_data(unsigned char value);

void MSdelay(unsigned int itime);

June 30, 2011 at 3:39 am #6396

PRATYUSH TRIPATHI
Participant

hey i have got a very simple solution……

just copy and paste the following statements(ANSI prototype)…….

lcdcmd(unsigned char value);

MSDelay(unsigned int value);

lcddata(unsigned char value);

but make sure that the function you have defined must include the contents of prototype statement.

example:

#include<reg51.h>

lcdcmd(unsigned char value);

MSDelay(unsigned int value);

lcddata(unsigned char value);

void main()

{

.

.

.

.

.

.

}

functions:

lcdcmd(unsigned char value);

{

rs=0;

rw=0;

en=1;

MSDelay(200);

en=0;

}

lcddata(unsigned char value);

{

…..

}

MSDelay(unsigned int value);

{

………….

}

July 1, 2011 at 11:30 am #6405

SaLMAN Ahmed Khan
Participant

@ thripati

ur solution is better

March 31, 2012 at 4:33 pm #7368

harpreet khanuja
Participant

I AM ENCOUNTER SAME ERROR..PLEASE HELP

GOLDITEMP.C(65): warning C206: ‘Lcd_Out’: missing function-prototype

GOLDITEMP.C(65): error C267: ‘Lcd_Out’: requires ANSI-style prototype

#include<reg51.h>

#include<stdlib.h>

//void lcd_data(unsigned char value);

// LCD module connections

sbit LCD_RS = P2^0;

sbit LCD_EN = P2^1;

sbit LCD_D4 = P2^2;

sbit LCD_D5 = P2^3;

sbit LCD_D6 = P2^4;

sbit LCD_D7 = P2^5;

// End LCD module connections

// OneWire pinout

sbit OW_Bit = P1^2;

// end OneWire definition

// Set TEMP_RESOLUTION to the corresponding resolution of used DS18x20 sensor:

// 18S20: 9 (default setting; can be 9,10,11,or 12)

// 18B20: 12

const unsigned short TEMP_RESOLUTION = 9;

char *text = “000.0000”;

unsigned temp;

void Display_Temperature(unsigned int temp2write) {

const unsigned short RES_SHIFT = TEMP_RESOLUTION – 8;

char temp_whole;

unsigned int temp_fraction;

// check if temperature is negative

if (temp2write & 0x8000) {

text[0] = ‘-‘;

temp2write = ~temp2write + 1;

}

// extract temp_whole

temp_whole = temp2write >> RES_SHIFT ;

// convert temp_whole to characters

if (temp_whole/100)

text[0] = temp_whole/100 + 48;

else

text[0] = ‘0’;

text[1] = (temp_whole/10)%10 + 48; // Extract tens digit

text[2] = temp_whole%10 + 48; // Extract ones digit

// extract temp_fraction and convert it to unsigned int

temp_fraction = temp2write << (4-RES_SHIFT);

temp_fraction &= 0x000F;

temp_fraction *= 625;

// convert temp_fraction to characters

text[4] = temp_fraction/1000 + 48; // Extract thousands digit

text[5] = (temp_fraction/100)%10 + 48; // Extract hundreds digit

text[6] = (temp_fraction/10)%10 + 48; // Extract tens digit

text[7] = temp_fraction%10 + 48; // Extract ones digit

// print temperature on LCD

Lcd_Out(2, 5, text);

}

void main() {

Lcd_Init(); // Initialize LCD

Lcd_Cmd(_LCD_CLEAR); // Clear LCD

Lcd_Cmd(_LCD_CURSOR_OFF); // Turn cursor off

Lcd_Out(1, 1, ” Temperature: “);

// Print degree character, ‘C’ for Centigrades

Lcd_Chr(2,13,223); // different LCD displays have different char code for degree

// if you see greek alpha letter try typing 178 instead of 223

Lcd_Chr(2,14,’C’);

//— main loop

do {

//— perform temperature reading

Ow_Reset(); // Onewire reset signal

Ow_Write(0xCC); // Issue command SKIP_ROM

Ow_Write(0x44); // Issue command CONVERT_T

Delay_us(120);

Ow_Reset();

Ow_Write(0xCC); // Issue command SKIP_ROM

Ow_Write(0xBE); // Issue command READ_SCRATCHPAD

temp = Ow_Read();

temp = (Ow_Read() << + temp;

//— Format and display result on Lcd

Display_Temperature(temp);

Delay_ms(500);

} while (1);

}

April 12, 2012 at 3:41 pm #7427

lalchand
Participant

lalchand oad 10ES30 Quaid e awam university of engineering science and technology nawabshah sindh pakistan

First define funtions befor void main() as :

#include <reg51.h>
void lcd_cmd(unsigned char value);
void MSdelay(unsigned int itime);
void lcd_data(unsigned char value);
sfr ldata=0x90;
sbit rs=P2^0;
sbit rw=P2^1;
sbit en=P2^2;
void main()
{
lcd_cmd(0x38);
MSdelay(250);
lcd_cmd(0x0E);
MSdelay(250);
lcd_cmd(0x1);
MSdelay(250);
lcd_cmd(0x06);
MSdelay(250);
lcd_cmd(0x86);
MSdelay(250);
lcd_data(‘M’); // DATA
MSdelay(250);
lcd_data(‘D’);
MSdelay(250);
lcd_data(‘E’);
}
void lcd_cmd(unsigned char value)
{
ldata=value;
rs=0;
rw=0;
en=1;
MSdelay(1);
en=0;
return;
}

void lcd_data(unsigned char value)
{
ldata=value;
rs=1;
rw=0;
en=1;
MSdelay(1);
en=0;
return;
}
void MSdelay(unsigned int itime)
{
unsigned int i,j;
for(i=0; i<itime; i++)
for (j=0; j<1275; j++);
}

May 6, 2012 at 7:26 am #7597

Diwanker Pandey
Participant

@salman

you are missing function prototype write it before main.

March 18, 2016 at 7:07 pm #13800

Rahul
Participant

#include<regx52.h>

#define lcd_databus P1

sbit lcd_en=P2^2;

sbit lcd_rs=P2^0;

void display_title();

void printline(unsigned char cmd,const unsigned char *dstr,unsigned char count);

void sendlcdCommand(unsigned char cmd);

void sendlcddata(unsigned char dcyte);

void intilcd();

void delay_ms(unsigned int mscount);

void delay_us(unsigned char uscount);

//void displaytemp(unsigned char addr,unsigned char tval);

//void toascii(unsigned char hval);

code const unsigned char megtitle1[]="W.I.T";

code const unsigned char megtitle2[]="Digital Portalbal Deivce";

code const unsigned char megtitle3[]="cloth lenth=";

code const unsigned char megtitle4[]="cm=0 mm=0";

void main()

{

intilcd();

display_title();

}

void display_titel()

{

printline(0x80,&megtitle1[0],16);

printline(0xc0,&megtitle2[0],16);

delay_ms(3000);

printline(0x80,&megtitle3[0],16);

printline(0xc0,&megtitle4[0],16);

}

void printline(unsigned char cmd,const unsigned char*dstr,unsigned char count)

{

unsigned char ch;

sendlcdcommand(cmd);

for(;count>0;count–)

{

ch=*dstr;

sendlcddata(ch);

dstr++;

}

}

void sendlCdcommand(unsigned char cmd)

{

lcd_rs=0;

lcd_databus=cmd;

lcd_en=1;

delay_us(5);

lcd_en=0;

delay_us(200);

}

void sendlcddata(unsigned char dcyte)

{

lcd_rs=1;

lcd_databus=dcyte;

lcd_en=1;

delay_us(5);

lcd_en=0;

delay_us(200);

}

void initlcd()

{

delay_ms(20);

sendlcdCommand(0x38);

delay_ms(20);

sendlcdCommand(0x38);

delay_ms(20);

sendlcdCommand(0x38);

sendlcdCommand(0x06);

sendlcdCommand(0x0c);

sendlcdCommand(0x14);

sendlcdCommand(0x01);

delay_ms(5);

}

void delay_ms(unsigned int mscount)

{

unsigned char i;

for(;mscount>0;mscount++)

{

for(i=250;i>0;i–)

{

}

}

}

void delay_us(unsigned char uscount)

{

for(;uscount>0;uscount++)

{

}

}

//ALSO LCD.C(36): error C267: 'sendlcdcommand': requires ANSI-style prototype

SLOVE ERROR PLZ

April 9, 2016 at 4:00 pm #13869

justin
Participant

//rearrange the program like this..

//interfacing using c
#include <reg51.h>
sfr ldata= 0x90;
sbit rs=P2^0;
sbit rw=P2^1;
sbit en=P2^2;
void MSDelay(unsigned int itime)
{
   unsigned int i,j;
   for(i=0;i<itime;i++)
   for(j=0;j<1275;j++);
}
void lcdcmd(unsigned char value)
{
   ldata=value;
   rs=0;
   rw=0;
   en=1;
   MSDelay(1);
   en=0;
   return;
}
void lcddata(unsigned char value)
{
   ldata = value;
   rs=1;
   rw=0;
   en=1;
   MSDelay(1);
   en=0;
   return;
}

void main()
{
   lcdcmd(0x38);
   MSDelay(250);
   lcdcmd(0x0E);
   MSDelay(250);
   lcdcmd(0x01);
   MSDelay(250);
   lcdcmd(0x06);
   MSDelay(250);
   lcdcmd(0x86);
   MSDelay(250);
   lcddata('m');
}
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