Help combining MSB & LSB

Comments

• kuroneko Posts: 3,623

  2011-08-13 06:50 edited 2011-08-13 06:50

  It may well be as simple as this

  PRI combine_unsigned(MSB, LSB)
  
    result.byte[0] := LSB
    result.byte[1] := MSB
  
  PRI combine_signed(MSB, LSB)
  
    result.byte[0] := LSB
    result.byte[1] := MSB
  
    return ~~result                  ' sign-extend word to long
  
• yousef Posts: 21

  2011-08-13 07:08 edited 2011-08-13 07:08

  Thanks, that helped
• yousef Posts: 21

  2011-08-13 07:18 edited 2011-08-13 07:18

  How to remove the last two bits(LSB) to make it 14 bits number?
• Leon Posts: 7,620

  2011-08-13 07:37 edited 2011-08-13 07:37

  Right shift?
• yousef Posts: 21

  2011-08-13 07:45 edited 2011-08-13 07:45

  yep, for example want 1001111111111101 to be 10011111111111
• Leon Posts: 7,620

  2011-08-13 07:52 edited 2011-08-13 07:52

  Don't you want the result to be 0010011111111111? It'll still be a 16-bit value.
• yousef Posts: 21

  2011-08-13 07:57 edited 2011-08-13 07:57

  its ok as long as i can get rid of the last two bits
• JonnyMac Posts: 9,307

  2011-08-13 07:59 edited 2011-08-13 07:59

  yousef wrote: »

  How to remove the last two bits(LSB) to make it 14 bits number?

  
  If the value is signed:
  

  result := result ~> 2
  

  
  This removes two LSB bits from the value while preserving the sign.
• yousef Posts: 21

  2011-08-13 08:07 edited 2011-08-13 08:07

  yeah it worked, thanks