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Type: Posts; User: Scott M

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    I used to get all sorts of spurious problems,...

    I used to get all sorts of spurious problems, when I tried to run two Javelins on a single, small power supply. I upgraded to a switching power supply providing over an amp, and all the problems...
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    Oversensitive Sin/Sout pins...

    I have a complicated application involving 2 Javelins, and one of them needs to be reprogrammed frequently. I've noticed an odd and annoying problem - when I plug a serial cable into the RS-232...
  3. Thread: shiftout speed

    by Scott M
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    shiftout speed

    How quickly does a shiftout send bits? If the doc describes this, I missed it.

    Is there any way to do shiftout as a VP? It would be wonderful to be able to throw bits at a VP and have them sent in...
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    You probably want a Javelin. The flat memory...

    You probably want a Javelin. The flat memory model saves a great deal of agony. The BS2sx may run faster, though, if you have speed constraints.
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    OK, this is lame, but before I plunk down $200...

    OK, this is lame, but before I plunk down $200 I'd like to make sure I have some idea what I'm doing. This is not complete code (hey, I just started reading the mauals today), but will it do what it...
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    136... ouch. I'd missed that. Ok, it's definitely...

    136... ouch. I'd missed that. Ok, it's definitely not a candidate for the complex command parser - it's not uncommon to load in 10-30 commands at a time (at 7 bytes each).

    Does anyone make a fast,...
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    >I can help you if you want to try it after you...

    >I can help you if you want to try it after you get your programming tools.

    Gee, with a willing victim to help, I can get a lot more ambitious. :-)

    My current controller is made up of 2...
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    >Scott, Can you explain why you need to send data...

    >Scott, Can you explain why you need to send data so fast ?

    I've probably overspecifed the need for speed - I'm so used to working with Javelins, which are always just a little slower than I...
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    OK, I'm looking at the code for the serial...

    OK, I'm looking at the code for the serial driven, 16 channel PWM code. Before I put dowm money on a dev environment, I have questions.

    I'd like to slam commands from a Javelin to the SX as fast...
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    8 PWM and a serial...

    I need a chip that can simultaneously handle driving 8 PWM lines and reading one serial data line. Someone suggested the SX chip, which I've never used. I'm reasonably comfortable with interrupt...
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    How do I... (PWM)

    I'm out of VPs on my Javelin, and I need to add 1 (or maybe 2) additional PWM outputs. (What I'd actually like to do is move all my existing PWM work to dedicated chips, and use the VPs for other...
  12. Thread: Timer "wraps"?

    by Scott M
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    Timer "wraps"?

    It looks like the timer class implements a 32 bit timer. This means the timer wraps every 10.5 hours or so. (I'm rounding off to keep the numbers simple, here).

    This should raise all sorts of...
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    Oring seems to have cleared this up. If Adding is...

    Oring seems to have cleared this up. If Adding is truely wrong, the doc needs to be checked.
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    This explains much. I'd been wondering why my app...

    This explains much. I'd been wondering why my app seemed to take so long to do serial output on a small handful of bytes. But that small handful of bytes has to be copied before they can be sent,...
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    instructions per second?

    Does anyone have information that shows how many VM operations the Javelin can do per second - or better yet, the execution time for each opcode? I know that a line of Java doesn't translate to a...
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    Oddness with writePin?

    Have folk used writePin to set multiple pins at once? I understand that you can only set pins 0-7 OR 8-15 in one call, but at one point I summed up some pinids between 8 and 11, called write, and had...
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    I looked at something like this. Just creating a...

    I looked at something like this. Just creating a scheme where you load an address into a counter, and have it go counting up through addresses until you get to some end point, and use those addresses...
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    I also found this. If I get one, and create a...

    I also found this. If I get one, and create a Java class for it, I'll post it. If someone already has one, could they let me know?

    http://www.xecom.com/datasheets/XE0068DT.pdf
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    Could someone email me that doc? Apparently you...

    Could someone email me that doc? Apparently you need to have a Yahoo account to get it... scottm@net1plus.com
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    Emergency phone dialer board?

    Does anyone know of a chip or board that implements an emergency dialer? The idea is that if I generate a logic High, I want a board to wake up, detect dial tone, call a pre-specified number, wait...
  21. Thread: Sin and Sout

    by Scott M
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    Sin and Sout

    Can the debug serial output of one Javelin be connected to the serial input of another? I am wondering if things printed with System.out.print are sent unmodified, or if there are magic bytes also...
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    That's what I ended up with - A Javelin as a...

    That's what I ended up with - A Javelin as a master and a Javelin as a slave, using 11 VPs between them. Not to mention a handful of 8:1 multiplexers so all the inputs could be funneled down to a few...
  23. *mutter* With some hacking, can get all the...

    *mutter* With some hacking, can get all the sounds and phrases I need encoded as individual samples (well, except for announcing numbers, but I can stand the short pauses in those cases.) So I can...
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    I use ULN2003's for this - an array of 7...

    I use ULN2003's for this - an array of 7 darlingtons with diode protection built-in. You run the output line of the stamp straight to one of the inputs of the ULN2003, and the output will drive a...
  25. Nifty. It confirms my suspicion, though - the...

    Nifty. It confirms my suspicion, though - the only way to find the addresses in the chip is by trial and error. That's ok if I don't plan on changing the messages often, but...

    It's a pity that...
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