Stumped: No luck watching a cogs output pin.

Paul

I'm trying to·watch the state of a pin that a cog is outputting with a 60 hz signal.· I can't figure out how to get the signal to show up on pin A6. Pin A5 works fine. Knowing that all cogs "share" I/O pins I thought this would be fairly easy. What piece of the puzzle am I missing?
Thanks,
--Paul

{{TESTS reading outa[noparse][[/noparse]21] }}

con
  _clkmode = xtal1 + pll16x
  _xinfreq = 5_000_000
  
VAR    ' Global Variables
  long  stack[noparse][[/noparse]20]
  byte  pin
  
PUB Start
  dira[noparse][[/noparse]6]~~
  cognew (square( 21 ),@stack)       
  repeat
    outa[noparse][[/noparse]6] := outa[noparse][[/noparse]21]    '<<< Doesn't work!
 
PUB square(pn)                              
  dira[noparse][[/noparse]pn]~~
  dira[noparse][[/noparse]5]~~
  repeat
    !outa[noparse][[/noparse]pn] 
    waitcnt(clkfreq/60 + cnt)
    outa[noparse][[/noparse]5] := outa[noparse][[/noparse]pn]    '<<< works 'inside' cog.

EDIT: Ok this is 30 Hz ...but still the same problem

Post Edited (Paul) : 3/8/2007 7:43:41 PM GMT

Christof Eb.

Hi Paul

I am not completely sure, but could you try
outa[noparse][[/noparse]6] := ina[noparse][[/noparse]21] ?

I assume, it does not work, because you try to read the output register of a different cog.

Christof

Mike Green

Each cog has its own output register (OUTA). You can read the actual state of the pin with INA. Christof Eb. is right. You're reading the main cog's OUTA[noparse][[/noparse]21] which is not the same as the one in the cog running square(21).

Paul

Hi Christof,

yep, that worked! I'm not sure why either. I must have read that part of the manual backwards. I thought the output register outa, held the status. I guess thats only internal to the cog.

It's interesting that: outa5 and outa[noparse][[/noparse]6] are now 180 out of phase.

Back to the books for me!
Thanks very much.
--Paul

Post Edited (Paul) : 3/8/2007 8:50:22 PM GMT

Paul

Thanks Mike