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Conditional statements

 
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coyoteboy



Joined: 11 Dec 2007
Posts: 2

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Conditional statements
PostPosted: Mon Jan 07, 2008 10:31 am     Reply with quote
Dear all,

I have little experience in CCS-C so I apologise for the newbie question!

I have some code that runs an infinite loop (while(true)) and has inside it a further statement, they look a little like this:
Code:
main()
{
 startup inc interrupts and timer1 setup
 print startup output
 while(true)
  {
   if ((input(PIN_B0) == 0) && connected == _OFF)
      {
      Print Debug statement
      CODE
      }
    other code
   }
}

I've monitored "connected" and it never changes, unless instructed to do so, from _OFF.
PIN_B0 sits at 5v(1) indefinitely, unless I drag it low, and so the CODE should not be executed. At powerup I get the startup output and then nothing - which seems ideal. As soon as I hit transmit a character to the device via serial connection the debug and CODE statements are executed, despite PIB_B0 apparently never going to 0 (hardware holds it high).

Have I missed something? Is there any condition where these inputs can change?
coyoteboy



Joined: 11 Dec 2007
Posts: 2

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PostPosted: Mon Jan 07, 2008 11:00 am     Reply with quote
I've cured this by repeatedly sampling the pin and averaging, as the HIN232 that feeds the B0 pin seems to be falling low when it should not - possibly a power rail problem.
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