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  1. Replies
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    Re: Propeller II update - BLOG

    That still seems like a lot complexity to speed up what are going to be, likely, just infrequent little blips.
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    Re: Propeller II update - BLOG

    Yes, we could, but there's a problem of getting interrupted for some indeterminate amount of time, and inadvertently hanging other threads that are trying to use the same resource. If you TLOCK, take...
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    Re: Propeller II update - BLOG

    All CALL instructions save the flags on the stack in bits 17 and 16, with the addres in bits 15..0. All RETs can optionally load Z and C from those same bits, but only if WZ/WC follow the RET...
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    Re: Propeller II update - BLOG

    I was just telling my dad about all the excellent ideas and input provided by people on the forum, and how half of them were from Australia and New Zealand. We're actually on the same clock, I think.
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    Re: Propeller II update - BLOG

    They'd have to be implemented in a way where you'd request one and then automatically loop until you get it. Otherwise, those umpteen cycles would be burned up in monkey motion vying for the lock....
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    Re: Propeller II update - BLOG

    Exactly.

    Preemptive threading is just a use case of multitasking.
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    Re: Propeller II update - BLOG

    Ha! That's the beauty of the whole thing. The scheduler CAN'T swap in another thread because the old thread is hogging the pipeline due to TLOCK. Only after the thread executes the TFREE will the...
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    Re: Propeller II update - BLOG

    Chip here. I'm on my dad's computer and didn't know he was logged in. I assumed it was my account.
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    Re: Propeller II update - BLOG

    Cases 2 and 3 are the same. They are tasks. So, you only need to know if other tasks are running, and, if so, issue TLOCK/TFREE around singular resource usages.
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    Re: Propeller II update - BLOG

    The WIDEs will be saved and restored under preemptive multitasking, but SETWIDE's configuration (address of WIDEs) ought to be universal for a particular multitasking scheme.
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    Re: Propeller II update - BLOG

    This is where you must use TLOCK/TFREE in the thread or task. That way, you can hog the multiplier/divider/squarerooter/CORDIC/other for the umpteen cycles it takes to load it, wait, and get the...
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    Re: Amazon Deliveries via Drone?

    The problem here is the power source. The best battery available can only deliver maybe 10 to 20 minutes of flight time. The need for a fuel cell power system would be the answer here but safety...
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    Jack, Having worked in aerospace for thirty...

    Jack,

    Having worked in aerospace for thirty years I can tell you nothing is easy or cheap when it comes to space type projects. Even the simple projects require a lot of analysis and testing just...
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    Parallax did provide some BASIC Stamps to the...

    Parallax did provide some BASIC Stamps to the group. The motorcycle used some Stamps and did qualify for the final race. I think he had the best setup as far as cost goes. All those other vehicles...
  15. Thread: CO Sensor

    by CHIPKEN
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    The CO sensor does require you to set the alarm...

    The CO sensor does require you to set the alarm limit from some suitable CO source. A butane hair curler would be a good source. The sensor itself does change with time and needs to be checked. The...
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    Use a DS2760 or buy the Parallax thermocouple...

    Use a DS2760 or buy the Parallax thermocouple sensor. You can detect +-64 mv.

    Chuck
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    http://forums.parallax.com/images/smilies/nono.gif...

    http://forums.parallax.com/images/smilies/nono.gif·It is not a good idea to power the MLX90614 module from a Prop or Stamp pin because it draws a lot of current (20 ma max). You can write to most ROM...
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    If you want to see more applications for the...

    If you want to see more applications for the MlX90614 sensor see Tom Cantrell article, "Hot Enough for You", in the recent October issue of Circuit Cellar. He measures the temperature of his...
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    I always wanted to build an "Al Gore Kit" with...

    I always wanted to build an "Al Gore Kit" with sensors like this.http://forums.parallax.com/images/smilies/jumpin.gif

    Chuck
  20. Something tells me this will be the best show of...

    Something tells me this will be the best show of shows. I'll watch the video of this first history making Propeller expo by the best innovators.

    Chuck
  21. The proposal that John McCain has for a $300...

    The proposal that John McCain has for a $300 million development effort for a better battery is probably a very good idea. For right now we will have to use·a hydrocarbon fuel·power, like the...
  22. The problem with robotics today is the...

    The problem with robotics today is the mechanical·components and powerful batteries are not there yet. I guess for the first time is history the electronics available·exceed the mechnical hardware...
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    The book you want is "The Digital I/O Handbook"...

    The book you want is "The Digital I/O Handbook" by Jon Titus and Tom O'Haanlan. The book is published by Sealevel Systems, Inc. in 2004 (ISBN 09759994-0-0). The cost is $19.95.

    Chuck
  24. Please be aware that you are connecting the...

    Please be aware that you are connecting the solenoid valve on the hot side. If the solenoid low(or netural)·side lead is grounded the valve will be actuated. Sometimes droping a metal wrench in the...
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    Maybe a change is needed to advance the "state of...

    Maybe a change is needed to advance the "state of the art". Something besides C and C++ or a new modified C+++.

    Chuck
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