Yeeching
Joined: 26 Jul 2008
Posts: 12
Location: Taipei Taiwan
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 03 Aug 2008 4:27 Re: LCD display with numeric keypad 4x4 |
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Hi,
Please ref. the LCD example c file.
It used for 8051 serial CPU, you may modifiy it for your CPU.
/
/
/ LCD Display
/ Ver. 1.0
/ Date Aug. 2, 2008
/
/ For ref. only
/
/
/*---------------------------------------------------------------------------*/
void LcdDelay(void)
{
int data i;
for(i = 0; i < 2000; i++)
{
}
}
/*---------------------------------------------------------------------------*/
void LcdBusy(void)
{
Lcd_RS = 0;
Lcd_RW = 1;
LcdCmdPort = 0xff;
Lcd_EN = 1;
Lcd_EN = 0;
while((LcdCmdPort & 0x80) != 0)
{
Lcd_EN = 0;
Lcd_EN = 1;
}
Lcd_EN = 1;
}
/*---------------------------------------------------------------------------*/
void LcdCmd(uchar c)
{
LcdBusy();
LcdCmdPort = c;
Lcd_RS = 0;
Lcd_RW = 0;
Lcd_EN = 0;
Lcd_EN = 1;
}
/*---------------------------------------------------------------------------*/
void LcdData(uchar c)
{
LcdBusy();
LcdDataPort = c;
Lcd_RS = 1;
Lcd_RW = 0;
Lcd_EN = 0;
Lcd_EN = 1;
LcdDelay();
}
/*---------------------------------------------------------------------------*/
void LcdInit(void)
{
Lcd_RS = 1;
Lcd_RW = 1;
Lcd_EN = 1;
LcdCmd(0x38);
LcdCmd(0x38);
LcdCmd(0x06);
LcdCmd(0x0c);
LcdCmd(0x02);
}
/*---------------------------------------------------------------------------*/
void LcdXY(uchar x, uchar y)
{
if((y & 0x01) != 0)
LcdCmd(0x80 | (x - 1));
else
LcdCmd(0xc0 | (x - 1));
}
/*---------------------------------------------------------------------------*/
void LcdClr(void)
{
LcdCmd(0x01);
}
/*---------------------------------------------------------------------------*/
void LcdHex(uchar c)
{
LcdData(table[(((c & 0xf0) >> 4) & 0x0f)]);
LcdData(table[(c & 0x0f)]);
}
/*---------------------------------------------------------------------------*/[/tex][/code]
[size=9][color=#999999]Added after 2 minutes:[/color][/size]
/
/ This program used for 8051 serial CPU, Just for your ref.
/
/ Date: Aug. 1, 2008
/
/
/
#include "reg52.h"
#define RS P1_0
#define RW P1_1
#define Enable P1_2
sbit P1_0=0x90;
sbit P1_1=0x91;
sbit P1_2=0x92;
void delay(void);
void InitialLCD(void);
void WriteIns(char);
void WriteData(char);
void WriteString(char,char *);
void CheckBusy(void);
/*void KeyScan(void);*/
char one=0;
char zero=0;
int KeyData=0xff;
int KeyTemp=0xff;
main()
{
char MSG0[]="0123456789";
char MSG1[]="I Love LCD";
char MSG2[]="02 AUG.,2008";
char MSG3[]="R=10K. C=10uF";
char MSG4[]="MCS-51";
char MSG5[]="01234";
char MSG6[]="56789";
char MSG7[]="ABCDE";
char MSG8[]="I Love YOU";
InitialLCD();
WriteString(13,MSG3);
/* while(1)
{
KeyScan();
if(KeyData!=0xff)
{
WriteIns(0x01);
if(KeyData==0)
WriteString(10,MSG1);
else if(KeyData==1)
WriteString(12,MSG2);
else if(KeyData==2)
WriteString(13,MSG3);
else if(KeyData==3)
WriteString(6,MSG4);
KeyData=0xff;
}
}*/
} /* main */
void InitialLCD(void)
{
WriteIns(0x38);
WriteIns(0x38);
WriteIns(0x38);
WriteIns(0x38);
WriteIns(0x08); /* off display */
WriteIns(0x01); /* clear buffer */
WriteIns(0x0e); /* on display */
WriteIns(0x06); /* set input mode */
} /* InitialLCD */
void WriteIns(char instruction)
{
RS=0;
RW=0;
Enable=1;
P2=instruction;
Enable=0;
CheckBusy();
} /* WriteIns */
void WriteData(char i)
{
RS=1;
RW=0;
Enable=1;
P2=i;
Enable=0;
CheckBusy();
} /* WriteData */
void WriteString(count,MSG)
char count;
char MSG[];
{
char i;
for(i=0;i<count;i++)
WriteData(MSG[i]);
} /* WriteString */
void CheckBusy(void)
{
char i=0x80;
while(i&0x80)
{
RS=0;
RW=1;
Enable=1;
i=P2;
Enable=0;
delay();
}
} /* CheckBusy */
void delay(void)
{
int i;
for(i=0;i<10000;i++)
;
} /* delay */
/*void KeyScan(void)
{
char key=0;
char KeyStatus;
char KeyScanLine=0x01;
char col;
char row;
for(col=0;col<2;col++)
{
P3=~KeyScanLine;
KeyStatus=~P3;
KeyStatus>>=2;
for(row=0;row<2;row++)
{
if(KeyStatus==0x01)
{
one=0;
if(KeyTemp!=key)
{
KeyTemp=key;
zero=1;
}
else
{
zero++;
if(zero==5)
KeyData=KeyTemp;
}
}
key++;
KeyStatus>>=1;
} *//* row */
/* KeyScanLine<<=1;
} *//* col */
/*one++;
if(one==5)
{
zero=0;
KeyTemp=0xff;
KeyData=0xff;
}
}*/ /* KeyScan */
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