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215 lines
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<ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control_register.html"><strong aria-hidden="true">3.3.</strong> The Display Control Register</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li><li><a href="../ch2/index.html" class="active"><strong aria-hidden="true">4.</strong> Ch 2: User Input</a></li><li><ol class="section"><li><a href="../ch2/the_key_input_register.html"><strong aria-hidden="true">4.1.</strong> The Key Input Register</a></li><li><a href="../ch2/the_vcount_register.html"><strong aria-hidden="true">4.2.</strong> The VCount Register</a></li><li><a href="../ch2/gba_snake.html"><strong aria-hidden="true">4.3.</strong> gba_snake</a></li></ol></li></ol>
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<h1 class="menu-title">Rust GBA Tutorials</h1>
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<main>
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<a class="header" href="#ch-2-user-input" id="ch-2-user-input"><h1>Ch 2: User Input</h1></a>
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<p>It's all well and good to draw three pixels, but they don't do anything yet. We
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want them to to something, and for that we need to get some input from the user.</p>
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<p>The GBA, as I'm sure you know, has an arrow pad, A and B, L and R, Start and
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Select. That's a little more than the NES/GB/CGB had, and a little less than the
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SNES had. As you can guess, we get key state info from an IO register.</p>
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<p>Also, we will need a way to keep the program from running "too fast". On a
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modern computer or console you do this with vsync info from the GPU and Monitor,
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and on the GBA we'll be using vsync info from an IO register that tracks what
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the display hardware is doing.</p>
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<p>For this chapter we'll make a copy of <code>hello2.rs</code> named <code>snake.rs</code> and then fill
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it in as we go. Normally you might not place the entire program into a single
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source file, but since these are examples it's slightly better to have them be
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completely self contained than it is to have them be "properly organized" for
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the long term.</p>
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