hex->ascii / ascii->hex

ascii -> hex

     if( asc >= '0' && asc <= '9')

{

       hex = asc - 0x30;

}

else if( asc >= 'A' && asc <= 'Z' )

{

       hex = asc - 0x37;

}

else 

{

       hex = asc - 0x57;

}

hex -> ascii

if((hex&0x0f)<=9){

OutByte('0'+(hex & 0x0f));

}

else{

OutByte('7'+(hex & 0x0f));  // 0x37+10= 'A'

}