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protheus
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How reliable are the CP2021s? I've been unimpressed with at one or two of the generic USB/TTL adapters I've gotten my hands on. Tend to stick with FTDI which are a bit more. In this case it may not matter, since you can apparently get Leonardo co…
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Incidentally, if some of your wires are loose, you can get exactly the same error even with the correct chip... I mean, so I've heard. Chris
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I haven't ever seen the code that runs the clock,though I've considered getting one at some point. Are you decent with programming in general? I ask because I personally don't find programming an arduino to be much different than programming anyth…
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So, just having had the experience of dealing with two third-party USB to TTL boards and a Diavolino in combination, maybe I can contribute something here. First, I may be reading you wrong, but you may be thinking about this in the wrong way. Tha…
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The AVR is working in the Diavolino. It's not working in the breadboard. It's hard to tell exactly what's not working, except that when I remove it from the board, and place it into the circuit on the breadboard, which I think is correct, it isn't…
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I suppose I should mention that I've tried two identical crystals and two identical sets of capacitors, with the same results. Chris
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The leostick does appear to have some fundamental problems with the way the arduino-as-isp stuff is handled, and I think this shouldn't be a huge problem for me now that I can get code onto the Diavolino, which ought to be much more usual in that re…
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Yes, I suppose it should. Well, it turns out that things aren't quite as bad as I thought they may be. No electrical problems with the board at all. The reason that it wouldn't program is that the TTL serial adapter I was trying to use (which is a…
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I'll check those perhaps later tonight, then. The 10k resistor is a pull-up for the reset line, right? So should I be able to tell for sure that it's working by actually testing the current through the reset pin? Obviously I can check the solder …
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Well, I'm beginning to wonder whether this thing has a bootloader on it. Just tried it with an FTDI board, and depending on which way I arrange the RX/TX pins, I get either a complete hang and a data light that's perpetually on, or an error stk500_…
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Also, good news. It looks like I just got my TTL stuff today. I should be able to do a proper test shortly. Still, I wonder what I might have been doing wrong here. Anyway, we'll see how it goes. Chris
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What might it mean if the delay isn't noticeable? As I was saying, it seems to start right away and just keep going. I hadn't been too worried about it, given that I have not been able to try programming it correctly yet, but could this be an indi…
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Does the loader flash the pin 13 led, then? It begins to flash as soon as it gets power and doesn't stop unless you pull reset low. Chris
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Well, you'd be able to do it a row at a time, where if you were doing 84 pixel rows, each set of two rows would have a byte split between them, so it would be equally easy to scroll off the edge by two rows, but it would be kind of a pain to do one.…
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That makes some sense now that you mention it. Fonts tend to be stretched horizontally much more often than vertically. I do also note that 48 is divisible evenly by eight, while 84 is not. This means that if you're obsessive-compulsive enough to…
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I should also note that the least significant bit of the number seems to become the top of the column, and then following pixels proceed downward to the most significant bit. Chris
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So, after going back and looking at the library, things are slightly stranger than I thought. The drawBitmap function assumes that each byte you hand it is a column (yes, really) of 8 bits, but the columns are written out from left to right, then…
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Thanks Windell. I did go through the tutorial, and everything works as advertised, but it doesn't seem to cover this subject. I haven't tried their forum, but I did look through it to see if anyone else was talking about this, which they werent. …
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Beautiful. I hadn't thought of that (obviously...), but you're absolutely right. One source of power at any given time should be enough. Chris
