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Code:
//*******De An VDK Nhom OV_DHKHTN_TPHCM*******//
//Tran Hoang Dat//
/*chuong trinh DEMO giao tiep 8051 voi PS/2*/
#include <REGX51.H>
#define rs P0_0
#define rw P0_1
#define enable P0_2
#define lcd_data P1
#define zise 20
unsigned char count=0,scancode=0,ip=0,capslock=0;
const unsigned char
meg_lcd_comman[5]= {
0x38,0x0E,0x01,0x06
},
meg_scancode_abc[47]={
0x45,0x16,0x1E,0x26,0x25,0x2E,0x36,0x3D,0x3E,0x46,
0x1C,0x32,0x21,0x23,0x24,0x2B,0x34,0x33,0x43,0x3B,
0x42,0x4B,0x3A,0x31,0x44,0x4D,0x15,0x2D,0x1B,0x2C,
0x3C,0x2A,0x1D,0x22,0x35,0x1A,0x29,0x4E,0x55,0x54,
0x5B,0x5D,0x4C,0x52,0x41,0x49,0x4A
},
meg_ascii_ABC[47]= {
48,49,50,51,52,53,54,55,56,57,
65,66,67,68,69,70,71,72,73,74,
75,76,77,78,79,80,81,82,83,84,
85,86,87,88,89,90,32,45,61,91,
93,92,59,39,44,46,47
};
unsigned char lcd_ready()
{
unsigned char busy;
lcd_data = 0xFF;
rw = 1;
rw = 1;
enable = 1;
enable = 1;
busy = lcd_data;
enable = 0;
return(busy);
}
void delay_us(unsigned char n)
{
unsigned char i;
for(i=0;i<n;i++);
}
void delay_ms(unsigned int n)
{
unsigned int i;
for(i=0;i<n;i++) delay_us(255);
}
void lcd_send_data( unsigned char data_or_comman )
{
lcd_data = data_or_comman;
lcd_data = data_or_comman;
delay_us(10);
enable = 1;
delay_us(10);
enable = 0;
delay_us(10);
}
void lcd_buffer( unsigned char choice, unsigned char data_or_comman )
{
rs = 0;
while ( lcd_ready()&0x80) ;
rs = choice;
delay_us(10);
rw = 0;
delay_us(10);
enable = 0;
lcd_send_data(data_or_comman);
}
void lcd_sets()
{
char i;
rs = 0;
rw = 0;
enable = 0;
delay_ms(15);
for(i=0;i<4;++i)
lcd_buffer(0,meg_lcd_comman[i]);
}
void lcd_point_x_y( unsigned char x, unsigned char y)
{
unsigned char point;
switch(y)
{
case 1 : point=0x80;break;
case 2 : point=0xC0;break;
case 3 : point=0x94;break;
case 4 : point=0xD4;break;
}
point+=x-1;
lcd_buffer(0,point);
}
void lcd_puts_char(char c)
{
lcd_buffer(1,c);
}
void lcd_puts_string( const char *msg)
{
while(*msg)
lcd_puts_char(*msg++);
ip++;
}
void inter_external(void) interrupt 0
{
if(count<9)
{
scancode=scancode>>=1;
if(P3_3)
scancode|=0x80;
else
scancode|=0x00;
}
count++;
}
unsigned char cover_to_ascii(unsigned char temp_scancode)
{
unsigned char i,test;
for(i=0;i<47;i++)
{
if(temp_scancode==meg_scancode_abc[i])
{
test=1;
break;
}
else
test=0;
}
if(temp_scancode==0x58)
{
capslock=!capslock;
ip--;
}
if(test)
{
if((capslock)||(i<10)||(scancode==0x29)||(i>=36))
return(meg_ascii_ABC[i]);
else
return(meg_ascii_ABC[i]+32);
}
else
{ ip--;
return(0);
}
}
void main(void)
{
char temp_lcd[1];
P3_3=1;// data
P3_2=1;// clock
TR1=1;
lcd_sets();
while(scancode!=0x76)
{
while(count<33)
{
EA=1;
EX0=1;
IT0=1;
}
temp_lcd[0]=cover_to_ascii(scancode);
if(scancode!=0x66)
{
lcd_buffer(0,meg_lcd_comman[3]);
}
else
{
lcd_buffer(0,0x04);
lcd_puts_string(" ");
ip=ip-3;
}
lcd_puts_string(temp_lcd);
count=0;
if((ip==16)||(scancode==0x5A))
{
lcd_buffer(0,0xC0);
ip=17;
}
}
///////////////////////////////////////////////
while(1)
{
delay_ms(800);
lcd_buffer(0,0x0A);
delay_ms(800);
lcd_buffer(0,0x0C);
}
}
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