Why won't this quit?

Comments

• Bruce Bates Posts: 3,045

  2005-11-30 22:45 edited 2005-11-30 22:45

  Smoke -
  
  Fiirst, you DO ... LOOP has no exit condition supplied, so it becomes an infinte loop. Thus, you must exit by some means from within that code segment. The ONLY exixt feasible, ONLY occurs:
  
  IF aux_pin0 = 0 THEN
  
  Now, aux_pin0 = In0 subordinate to an AUXIO, thus it's pin port 0 of the auxilliary set, which maps to physical pin 21. Is there anything attached to physical pin 21? If so, does the state of pin 21 ever change?
  
  
  Regards,
  
  Bruce Bates
• Smoke Liberation Front Posts: 30

  2005-11-30 23:19 edited 2005-11-30 23:19

  The physical pin 24 is switched through a resistor either to DC+5v or to ground. when it goes to ground, the if statement should be executed. Within this conditional statement, I have put in an EXIT command which should drop the program out of the loop and effectively ending the program.
  
  When PP24 goes low, the Stamp seems to go into a wait and see kind of operation and the lines after the LOOP statement never get executed. When I set the physical pin 24 to high again, the program restarts.
  
  Is this behavior due to the use of the poll commands? What else could cause it? When I write a similiar program w/o polling, the Stamp works like expected.
  
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  Freeing smoke from wire and IC captivity since 1972
• Smoke Liberation Front Posts: 30

  2005-12-02 14:39 edited 2005-12-02 14:39

  Is my assumption in my last request correct?
  
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  Freeing smoke from wire and IC captivity since 1972
• Smoke Liberation Front Posts: 30

  2005-12-02 15:40 edited 2005-12-02 15:40

  Is this behavior due to the use of the poll commands? What else could cause it? When I write a similiar program w/o polling, the Stamp works like expected.
  
  Anyone please respond.
  
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  Freeing smoke from wire and IC captivity since 1972
• Smoke Liberation Front Posts: 30

  2005-12-02 16:41 edited 2005-12-02 16:41

  I think I am getting it.
  
  In the Basic Stamp Manual, it makes refernce running continuously on page 308 and going back to the start of the program.
  
  So it was because of the pollmode that made it continuosly run. I'll now work on how to make it run as expected.
  
  
  
  Always looking for feedback...
  
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  Freeing smoke from wire and IC captivity since 1972
• Smoke Liberation Front Posts: 30

  2005-12-02 17:08 edited 2005-12-02 17:08

  The culprit has been found... It is indeed the pollmode commands.
  

  'discovery0.bsp
  ' {$STAMP BS2p}
  ' {$PBASIC 2.5}
  aux_pin0 VAR Bit
  MAINIO
  aux_pin0 = IN0
  DEBUG "I'm preparing to start..." , TAB, DEC aux_pin0, CR
  
  MAINIO
    POLLIN 0,1
    POLLOUT 15,1
  AUXIO
    POLLOUT 15,1
  POLLMODE 4
   
  DEBUG "I'm starting...", TAB, DEC aux_pin0, CR
  DO WHILE (aux_pin0= 1)
    MAINIO
      aux_pin0 = IN0
    DEBUG "I'm still waiting...",TAB, DEC aux_pin0, CR
    IF aux_pin0=0 THEN
      POLLMODE 0
      EXIT
    ENDIF
  LOOP
   
  IOTERM 0
  OUTS = %0000000000000000 'All logic low
  IOTERM 1
  OUTS = %0000000000000000 'All logic low
  DEBUG "I'm finished"
  
  

  
  I simply needed to change the pollmode inside the loop to pollmode 0. I had been trying to keep the pollmodes the same in the first section and in the loop.
  
  Anyway. Thanks for the help. I'm sure I'll post some more.
  
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  Freeing smoke from wire and IC captivity since 1972
• John R. Posts: 1,376

  2005-12-02 19:27 edited 2005-12-02 19:27

  Smoke;
  
  It was interesting to see you work your way throught the problem, even if much of the conversation was between yourself.
  
  Thanks for taking the time to post your solution.
  
  
  
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  John R.
  
  8 + 8 = 10
• Paul Baker Posts: 6,351

  2005-12-02 19:41 edited 2005-12-02 19:41

  Yes, Im impressed with your self determination on figuring it out, refreshing change to the "demand an answer" approach. Ill be happy to help you with your questions, I just didnt have an answer for this one.
  
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  ·1+1=10