[?]: Conversion blocks binary-gray (17 bits)

[Scarch]

Hi all,
I need to convert binary to grey code but siemens requires a password from this page: http://support.automation.siemens.com/W ... n/25629271

Somebody have these blocks available?
Many thanks

[Homeroid_BL]

C'mon, do it youself.
Here is a converter for 4bits, using XOR logic.

[Info]

sample how convert

[Scarch]

Hi...
I have used a program from Sania in order to convert from gray to decimal for 10 bits, but now I need it for 16 bits (1 word) and do not know how to modify it.
Please help. It is used for an absolute multiturns encoder, being able to read from zero to 65536 in gray code.
I can't manage it.

[Nick_N]

Wikipedia says there's another formula. STL implementation:

Code: Select all

//C formula:
//        unsigned short temp = num ^ (num>>8);
//        temp ^= (temp>>4);
//        temp ^= (temp>>2);
//        temp ^= (temp>>1);
//        return temp;
//Taken from http://en.wikipedia.org/wiki/Gray_code#Converting_to_and_from_Gray_code
// temp = num ^ (num>>8);
      L     #Gray
      SRW   8
      L     #Gray
      XOW   
      T     #Temp
// temp ^= (temp>>4);
      L     #Temp
      SRW   4
      L     #Temp
      XOW   
      T     #Temp
// temp ^= (temp>>2);
      L     #Temp
      SRW   2
      L     #Temp
      XOW   
      T     #Temp
// temp ^= (temp>>1);
      L     #Temp
      SRW   1
      L     #Temp
      XOW   
//return temp;
      T     #RET_VAL

Variables #Gray, #Temp and #RET_VAL are of type WORD.
#Gray (IN) = Gray code
#Temp (TEMP) = temporary value
#RET_VAL (RETURN) = result of calculation, binary value

Works for 16-bit Gray code.