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If you click the link above and send me your address details on PayPal I'll send you the kit in time for Xmas!

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Lights!

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Following on from the last post we'll set up the oscillator while we're in the configuration bits. See this one, RSTOSC? Notice how it has the Warning Sign next to it? It means we can't just change it. So what we need to do is to click the button "Generate Source Code to Output". Click it. There will be a list of what are called compiler directives. These start with #pragma. #pragma directives are not C. They are specific lines that tell a specific compiler to do a specific thing, in this case it is setting configuration bits. There are two of these you'll need, one is the watchdog, the other is the oscillator. Don't worry too much about why, just copy them in. All will become clear later. Here they are: #pragma config WDTE = OFF // WDT operating mode (WDT Disabled, SWDTEN is ignored) #pragma config RSTOSC = LFINT // Power-up default value for COSC bits (LFINTOSC) Then forget about them until a lot later. But don't leave them out! Your code should ...
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What happened?

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This is where you'll see the difference between playing with a little plastic chip and playing with the Web, Windows, Unix, MAC and all those other huge toys. Remember the end bit of this ? How, and why, did it jump out of the loop and start again at the beginning? A "normal" program wouldn't. But most microprocessors have a thing called a watchdog. It's a friendly thing. Here is one: The watchdog keeps an eye on what your code is doing. We'l go more into it later, but the reason the code jumps back to the beginning is because of him. You can turn him off. Put him back in his kennel. Let's do that. In the Window Menu, underTarget Memory Views, click on Configuration bits. Look down the bottom, you'll see them. There's one there called WDTE. You can find it. Click where it says ON and turn it to OFF. Now debug the program again, and see if it runs ad infinitum . That's Latin. Impressed? Bet it does. Hope it does. I...
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Let's Play!

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If you've read and done what the last couple of posts said, you should be up and running with everything working, software-wise. You've got a project called MM1. It compiles but it doesn't do anything. Let's make it do something. Stop if you don't understand, and read it again. It isn't difficult, and it's going to tell you not just how to take something out of the box and plug it in, but how it works. Once you understand how it works, you'll be able to make it do anything it's capable of doing. The datasheet for this little 20-legged thing is here . If you can read and understand all of that, you don't need to read any more of this. Let me know if you want a job. However, if you don't entirely understand, let's start at the beginning, hands-on, and see if you can make yourself a micromeister! C experts: at this point, don't flame me with "that isn't how you do it!" please. I'm doing it for a reason, I kn...
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