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#include <MEGA8515.h>
#define phim_rong 0xff
#define p_DataPS2 PIND.4
unsigned char m_CurselPS2;
unsigned char m_DataPS2;
bit m_break;
bit m_thuong_hoa;
unsigned char unshifted[48][2]= {
0x1c,'a',
0x32,'b',
0x21,'c',
0x23,'d',
0x24,'e',
0x2b,'f',
0x34,'g',
0x33,'h',
0x43,'i',
0x3b,'j',
0x42,'k',
0x4b,'l',
0x3a,'m',
0x31,'n',
0x44,'o',
0x4d,'p',
0x15,'q',
0x2d,'r',
0x1b,'s',
0x2c,'t',
0x3c,'u',
0x2a,'v',
0x1d,'w',
0x22,'x',
0x35,'y',
0x1a,'z',
0x45,'0',
0x16,'1',
0x1e,'2',
0x26,'3',
0x25,'4',
0x2e,'5',
0x36,'6',
0x3d,'7',
0x3e,'8',
0x46,'9',
0x0e,'`',
0x4e,'-',
0x55,'=',
0x5d,'\\',
0x54,'[',
0x5b,']',
0x4c,';',
0x52,'\'',
0x41,',',
0x49,'.',
0x4a,'/',
0,0
};
// Shifted characters
unsigned char shifted[48][2]= {
0x1c,'A',
0x32,'B',
0x21,'C',
0x23,'D',
0x24,'E',
0x2b,'F',
0x34,'G',
0x33,'H',
0x43,'I',
0x3b,'J',
0x42,'K',
0x4b,'L',
0x3a,'M',
0x31,'N',
0x44,'O',
0x4d,'P',
0x15,'Q',
0x2d,'R',
0x1b,'S',
0x2c,'T',
0x3c,'U',
0x2a,'V',
0x1d,'W',
0x22,'X',
0x35,'Y',
0x1a,'Z',
0x45,')',
0x16,'!',
0x1e,'@',
0x26,'#',
0x25,'$',
0x2e,'%',
0x36,'^',
0x3d,'&',
0x3e,'*',
0x46,'(',
0x0e,'~',
0x4e,'_',
0x55,'+',
0x5d,'|',
0x54,'{',
0x5b,'}',
0x4c,':',
0x52,'"',
0x41,'<',
0x49,'>',
0x4a,'?',
0,0
};
//*********************************************************************
//---------------------------------------------------------------------
//*********************************************************************
unsigned char Converkeyboard(unsigned char nDataPS2)
{
unsigned char i;
if(nDataPS2 == 0xf0) //ma bao nha phim
{
m_break = 1;
return phim_rong;
}
if(m_break) //xu ly ma nha phim
{
if(nDataPS2 == 0x12 || nDataPS2 == 0x59)//neu la ma Shift
{
m_thuong_hoa = 0;
}
m_break = 0;
return phim_rong;
}
else
{
if(nDataPS2 == 0x12 || nDataPS2 == 0x59)//nhan phim Shift
{
m_thuong_hoa = 1;
return phim_rong;
}
if(nDataPS2 == 0x29) return ' ';
if(!m_thuong_hoa)
{
for(i = 0; unshifted[i][0]!=nDataPS2 && unshifted[i][0]; i++);
if (unshifted[i][0] == nDataPS2) return unshifted[i][1];
}
else
{
for(i = 0; unshifted[i][0]!=nDataPS2 && shifted[i][0]; i++);
if (unshifted[i][0] == nDataPS2) return shifted[i][1];
}
return phim_rong;
}
}
//*********************************************************************
//---------------------------------------------------------------------
//*********************************************************************
interrupt [EXT_INT0]//su kien ngat ngoai 0
void CK_PS2(void)//ham xu ly ngat ngoai 0
{
m_CurselPS2++;
if(m_CurselPS2==1) //bit START
{
if(p_DataPS2)m_CurselPS2=0; //text START
}
else
if(m_CurselPS2>1&&m_CurselPS2<10)
{
m_DataPS2 = (m_DataPS2 >> 1); //quay trai m_DataPS2 (m_DataPS2.7 = 0)
if(p_DataPS2) m_DataPS2 = m_DataPS2 | 0x80; // Store a ’1’
}
else
if(m_CurselPS2>10) //bit STOP
{
if(p_DataPS2)
{
// makytu = Converkeyboard(m_DataPS2);
// tuy ban xu ly ma ky tu
}
m_CurselPS2=0;
} //bo qua Parity
}
void main(void)
{
//========================================================================
//KHOI TAO NGAT NHGOAI 0,1
MCUCR = 0x02; //NGAT NGOAI 0 CANH XUONG
GICR = 0x40; // INT0.6 =[1] CHO PHEP NGAT NGOAI 0;
m_CurselPS2=0;
DDRD = 0x00;
PORTD =0xff;
while(1);
}
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