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Version: <b>0.9.9</b><br>
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<a href=../>Home</a> > <a href=../apireference.html>Lua API reference</a> > Callbacks
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<li><a href=#addeventcallback>addEventCallback</a></li>
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<h1>Callbacks</h1>
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<li><a href=#addeventcallback>addEventCallback</a></li>
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<li><a href=#removeeventcallback>removeEventCallback</a></li>
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<h2 id=addeventcallback>addEventCallback</h2>
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<p><strong>Syntax</strong></p>
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<pre><code>emu.addEventCallback(function, type)
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</code></pre>
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<p><strong>Parameters</strong><br>
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function - A Lua function.<br>
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type - <em>Enum</em> See <a href=../apireference/enums.html#eventtype>eventType</a>.</p>
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<p><strong>Return value</strong><br>
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Returns an integer value that can be used to remove the callback by calling <a href=#removeeventcallback>removeEventCallback</a>.</p>
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<p><strong>Description</strong><br>
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Registers a callback function to be called whenever the specified event occurs.<br>
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The callback function receives no parameters.</p>
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<h2 id=removeeventcallback>removeEventCallback</h2>
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<p><strong>Syntax</strong></p>
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<pre><code>emu.removeEventCallback(reference, type)
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</code></pre>
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<p><strong>Parameters</strong><br>
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reference - The value returned by the call to <a href=#addeventcallback>addEventCallback</a>.<br>
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type - <em>Enum</em> See <a href=../apireference/enums.html#eventtype>eventType</a>.</p>
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<p><strong>Return value</strong><br>
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<em>None</em></p>
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<p><strong>Description</strong><br>
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Removes a previously registered callback function.</p>
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<h2 id=addmemorycallback>addMemoryCallback</h2>
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<p><strong>Syntax</strong></p>
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<pre><code>emu.addMemoryCallback(function, type, startAddress [, endAddress])
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</code></pre>
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<p><strong>Parameters</strong><br>
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function - A Lua function.<br>
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type - <em>Enum</em> See <a href=../apireference/enums.html#memcallbacktype>memCallbackType</a><br>
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startAddress - <em>Integer</em> Start of the CPU memory address range to register the callback on.<br>
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endAddress - (optional) <em>Integer</em> End of the CPU memory address range to register the callback on.</p>
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<p><strong>Return value</strong><br>
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Returns an integer value that can be used to remove the callback by calling <a href=#removememorycallback>removeMemoryCallback</a>.</p>
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<p><strong>Description</strong><br>
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Registers a callback function to be called whenever the specified event occurs.<br>
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The callback function receives 2 parameters <code>address</code> and <code>value</code> that correspond to the address being written to or read from, and the value that is being read/written.</p>
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<p>For reads, the callback is called <em>after</em> the read is performed.<br>
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For writes, the callback is called <em>before</em> the write is performed.</p>
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<p>If the callback returns an integer value, it will replace the value – you can alter the results of read/write operation using this. e.g:</p>
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<div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-lua data-lang=lua><span style=color:#66d9ef>function</span> <span style=color:#a6e22e>writeCallback</span>(address, value)
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<span style=color:#75715e>--This sets bit 0 to 0 for all CHR RAM writes</span>
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<span style=color:#66d9ef>return</span> value <span style=color:#f92672>&</span> <span style=color:#ae81ff>0xFE</span>
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<span style=color:#66d9ef>end</span>
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emu.addMemoryCallback(writeCallback, emu.memCallbackType.ppuWrite, <span style=color:#ae81ff>0</span>, <span style=color:#ae81ff>0x1FFF</span>)
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</code></pre></div><h2 id=removememorycallback>removeMemoryCallback</h2>
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<p><strong>Syntax</strong></p>
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<pre><code>emu.removeMemoryCallback(reference, type, startAddress [, endAddress])
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</code></pre>
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<p><strong>Parameters</strong><br>
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reference - The value returned by the call to <a href=#addmemorycallback>addMemoryCallback</a>.<br>
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type - <em>Enum</em> See <a href=../apireference/enums.html#memcallbacktype>memCallbackType</a>.<br>
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startAddress - <em>Integer</em> Start of the CPU memory address range to unregister the callback from.<br>
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endAddress - (optional) <em>Integer</em> End of the CPU memory address range to unregister the callback from.</p>
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<p><strong>Return value</strong><br>
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<em>None</em></p>
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<p><strong>Description</strong><br>
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Removes a previously registered callback function.</p>
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