Why won't this program work?

RichardF

This works:
Pub start
·dira[noparse][[/noparse]23]~~
·led_on
Pri led_on
·repeat
· outa[noparse][[/noparse]23]~~

This doesn't!
Var
·long stack0[noparse][[/noparse]20]
Pub start
·dira[noparse][[/noparse]23]~~
·cognew(led_on, @stack0)
Pri led_on
·repeat
· outa[noparse][[/noparse]23]~~

Please help me solve this most basic problem.
·

Mike Green

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

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

Richard,
That bit me in the butt a couple times too. So don't feel bad.

Bean.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
“The United States is a nation of laws -· poorly written and randomly enforced.” - Frank Zappa

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
www.hittconsulting.com
·

Graham Stabler

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