encoder speed readout issue

laser-vector

Im trying to read from some quadrature rotary encoders. i downloaded some code named QEDEngine.spin from the exchange. plugged the encoders into the propeller and am able to read "some" speed from them along with the delta position.

the problem is that when i read the speed i get a bunch of errors at the end (the very last value trails for a little after the encoder has stopped rotating)

Eg. serial terminal output:

0
-84
-177
-303
-556
-916
-830
-2494
-3225
-4086
-4907
-5779
-6500
-6963
-7221
-7155
-6902
-6240
-2859
-5167
-4701
-4218
-3681
-3160
-2701
-2224
-1690
-1351
-1054
-553
-259
309
289
191
191
191
191
191
191
191
0
0
0

im not sure whats wrong here...

CON

        _clkmode = xtal1 + pll16x
        _xinfreq = 6_250_000

VAR
        LONG ABSOLUTE
        long stack[20]
OBJ

        NUM   :  "numbers"
        Debug  : "fullduplexserial"
        Encoder : "QEDEngine"
PUB term

        num.init
        debug.start(31, 30, 0, 57600)
        encoder.QEDEngine
        cognew(calc, @stack)
        
        repeat           
          debug.str(num.tostr(ABSOLUTE, num#dec))
          debug.tx($0D)
          waitcnt(1000000 + cnt)

PUB calc | state
 dira[0]~~
 dira[27]~~
 outa[27]~~
 dira[27]~
      repeat  
       state := ina[27]
       if state == 1
        outa[0]~
       if state == 0
        outa[0]~~ 
                
       ABSOLUTE := encoder.getSpeedA

and thanks for any help.