Gray code

[Guest]

How to convert gray to binary?

[stevev]

What kind of gray code are you talking about? A simple optical encoder or aviation altitude gray code? Or something else?

[Cyril]

Here is a function I use for an 8 bit absolute rotary encoder (on port B)

int read_encoder(){
int i,binary,gray;
gray = port_b;
binary = 255; //set all bit
if(!bit_test(gray,7)) bit_clear(binary,7);
for(i=7;i>0;i--){
if((bit_test(binary,i))==(bit_test(gray,i-1))) bit_clear(binary,i-1);
}
return(binary);
}