LCD FOR 8051 written in C (keil)

[glenndr_15]

Hello po! need ko po ng LCD program in C ng keil sino po pwede mag share dyan?
thanks

best regards,
glenndr_15

[toasted siopao]

Search google for an LCD library for Keil C.

[ajak]

glenndr_15

me sumagot na sa thread mo sa sonsivri..

[leoren_tm]

if 2x16 lang nman ok to...http://8052.com/tutlcd
if gust mo nang ready made http://8052.com/codelib


peru mas ok kung gumawa ka from datasheet.

[glenndr_15]

glenndr_15

me sumagot na sa thread mo sa sonsivri..

may access ka din po ba  sa sonsivri?

[glenndr_15]

glenndr_15

me sumagot na sa thread mo sa sonsivri..

nakita na kita sa sonsivri pati yung thread mo hehe

[engineer7@home]

Here is an old set of routines used for a HD44780 based 2X16 LCD Module.  This is a quick test and I used a software delay instead of a timer based delay.

If you are a beginner, you can just ground pin 5 R/W pin of the LCD and use a software delay.  After some practice, you can read or poll the Busy Flag to see if the LCD Module has finished it's task.
Your microcontroller and LCD Module can be damaged because of bus contention due to error in the handshaking of the LCD and the Microcontroller.  By Grounding pin no.5 of the LCD, you just write to the LCD and the databus of the LCD is in Input mode,so nothing happens even if you make a mistake.
Please take note of the control pins and databus used.  Change according to your connection.

Code:

/* DEMO LCD ROUTINES USING 8 bit interface */
/*Author Noel A. Rios */
//Microcontroller: 89C52

#include <stdlib.h>
#include <reg52.h>


sbit LCDFLAG= P1^7;
sbit Enable = P0^2;
sbit RS = P0^0;
sbit RW = P0^1;

unsigned char CGRam;  /* 0-64 */
unsigned char DDRam;
unsigned char character;
int i;
unsigned char j;
code char message[]={"Noel A. Rios    "};
unsigned char pointer;



void Clear_Display(void);
void Cursor_Home(void);
void LCD_Config(void);
void Display_Control(void);
void Cursor_Control(void);
void Entry_Mode(Void);
void CGRam_Address(void);
void DDRam_Address(void);
void Read_Busy_Flag(void);
void Write_Data(void);
void delay(void);
void delay2(void);
void Write_String(void);


void Clear_Display(void)
{
character=1;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}


void Cursor_Home(void)
{
character=0x02;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void Entry_Mode(void)
{
character=0x06;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void Display_Control(void)
{
character=0x0C;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void Cursor_Control(void)
{
character=0x14;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void LCD_Config(void)
{
character=0x38;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
delay();
Read_Busy_Flag();
}

void CGRam_Address(void)
{
character=0x40|CGRam;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void DDRam_Address(void)
{
character=0x80|DDRam;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void Read_Busy_Flag(void)
{
P1=0xFF;
RS=0;
RW=1;
do{
Enable=0;
Enable=1;
delay2();}
while (LCDFLAG==1);
Enable=0;
}

void Write_Data(void)     /*Call with character =character */
{
P1=character;
RS=1;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}


void delay(void)
{
for(i=0;i<65535;i++)
{}
}


void delay2(void)
{
for(j=0;j<255;j++)
{}
}


void Write_String(void)
{
for(pointer=0;pointer<16;pointer++)
{
character=message[pointer];
Write_Data();
}
}



void main(void)
{
Enable=0;
LCD_Config();
Display_Control();
Entry_Mode();
Cursor_Home();
Write_String();
DDRam=0x40;
DDRam_Address();
character='N';
Write_Data();

do{}
while(1);


}

[1diyMARKET]

Here is an old set of routines used for a HD44780 based 2X16 LCD Module.  This is a quick test and I used a software delay instead of a timer based delay.

If you are a beginner, you can just ground pin 5 R/W pin of the LCD and use a software delay.  After some practice, you can read or poll the Busy Flag to see if the LCD Module has finished it's task.
Your microcontroller and LCD Module can be damaged because of bus contention due to error in the handshaking of the LCD and the Microcontroller.  By Grounding pin no.5 of the LCD, you just write to the LCD and the databus of the LCD is in Input mode,so nothing happens even if you make a mistake.
Please take note of the control pins and databus used.  Change according to your connection.

Code:

/* DEMO LCD ROUTINES USING 8 bit interface */
/*Author Noel A. Rios */
//Microcontroller: 89C52

#include <stdlib.h>
#include <reg52.h>


sbit LCDFLAG= P1^7;
sbit Enable = P0^2;
sbit RS = P0^0;
sbit RW = P0^1;

unsigned char CGRam;  /* 0-64 */
unsigned char DDRam;
unsigned char character;
int i;
unsigned char j;
code char message[]={"Noel A. Rios    "};
unsigned char pointer;



void Clear_Display(void);
void Cursor_Home(void);
void LCD_Config(void);
void Display_Control(void);
void Cursor_Control(void);
void Entry_Mode(Void);
void CGRam_Address(void);
void DDRam_Address(void);
void Read_Busy_Flag(void);
void Write_Data(void);
void delay(void);
void delay2(void);
void Write_String(void);


void Clear_Display(void)
{
character=1;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}


void Cursor_Home(void)
{
character=0x02;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void Entry_Mode(void)
{
character=0x06;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void Display_Control(void)
{
character=0x0C;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void Cursor_Control(void)
{
character=0x14;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void LCD_Config(void)
{
character=0x38;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
delay();
Read_Busy_Flag();
}

void CGRam_Address(void)
{
character=0x40|CGRam;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void DDRam_Address(void)
{
character=0x80|DDRam;
P1=character;
RS=0;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}

void Read_Busy_Flag(void)
{
P1=0xFF;
RS=0;
RW=1;
do{
Enable=0;
Enable=1;
delay2();}
while (LCDFLAG==1);
Enable=0;
}

void Write_Data(void)     /*Call with character =character */
{
P1=character;
RS=1;
RW=0;
Enable=0;
Enable=1;
delay2();
Enable=0;
Read_Busy_Flag();
}


void delay(void)
{
for(i=0;i<65535;i++)
{}
}


void delay2(void)
{
for(j=0;j<255;j++)
{}
}


void Write_String(void)
{
for(pointer=0;pointer<16;pointer++)
{
character=message[pointer];
Write_Data();
}
}



void main(void)
{
Enable=0;
LCD_Config();
Display_Control();
Entry_Mode();
Cursor_Home();
Write_String();
DDRam=0x40;
DDRam_Address();
character='N';
Write_Data();

do{}
while(1);


}

Nice one, pero pagkahaba naman.  di ba puwede ang 4 bit interface tapos gamitin ang 4 bit build in library?