Why won't this program work?

Comments

• Mike Green Posts: 23,101

  2007-06-01 18:19 edited 2007-06-01 18:19

  Each cog has its own DIR and OUT register set. You are setting DIR in one cog, but setting OUT in another cog where the DIR register is still set to zeroes. Move the dira[noparse][[/noparse]23]~~ into led_on and it should work. Note that you don't need to have the outa[noparse][[/noparse]23]~~ within the repeat loop. You can just have

  pri led_on
     dira[noparse][[/noparse]23]~~
     outa[noparse][[/noparse]23]~~
     repeat
  
  

  
  
  If you leave out the repeat, the newly started cog routine (led_on) exits immediately, stopping it.
  The initial cog (with the start stuff in it) stops itself immediately after the COGNEW is executed.
• RichardF Posts: 168

  2007-06-01 18:48 edited 2007-06-01 18:48

  Mike,
  
  ·I honestly studied the manual and never picked up on each cog having its' own dira and outa registers, but... with a little thought, it is obvious it has to be that way! Thanks for the help.
  
  Richard
• Bean Posts: 8,129

  2007-06-01 18:52 edited 2007-06-01 18:52

  Richard,
  That bit me in the butt a couple times too. So don't feel bad.
  
  Bean.
  
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• Graham Stabler Posts: 2,507

  2007-06-02 01:14 edited 2007-06-02 01:14

  I think its fairly early on in the manual when you don't think you need to read too hard [noparse]:)[/noparse]
  
  Page 26, I/O pins
  
  I got bitten today [noparse]:)[/noparse]
  
  Graham