keyboard interface to 16f628

[Guest]

This code read input from the keyboard using the 16f628. I m using loop to detect the clock signal from the keyboard. I have learned that this can be done by using interrupt. Can anybody teach me how to do this?

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void kbd(int n); //send keyboard input through rs232

int clk=0;
int c1=0;
int c2=0;

void main()
{
WHILE(TRUE) {

if(!input(pin_b3) && flg==false) { //when the keyboard clock goes low
flg=true;

if(input(pin_b0)) { //data of keyboard
if(clk==1) c2+=1;
else if(clk==2) c2+=2;
else if(clk==3) c2+=4;
else if(clk==4) c2+=8;
else if(clk==5) c1+=1;
else if(clk==6) c1+=2;
else if(clk==7) c1+=4;
else if(clk==8) c1+=8;
}
clk++;

if(clk==11) {
output_low(pin_b3); //halt the keyboard from sending data
kbd(c2+(c1*16));
c1=c2=0;
output_high(pin_b3);
clk=0;
}
}
else if(input(pin_b3) && flg==true) {
flg=false;
}
}
}
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[leesing2k3]