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31 lines
726 B
C++
31 lines
726 B
C++
/*
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Copyright (C) 2007 Acekard, www.acekard.com
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SPDX-License-Identifier: MIT
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*/
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#include <nds.h>
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void waitMs(unsigned int requestTime) {
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unsigned int lastLine = REG_VCOUNT;
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unsigned int newLine;
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unsigned int elapsedTime = 0; // in ms
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unsigned int elapsedLines = 0; // in lines
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while (elapsedTime < requestTime) {
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int diffLine;
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newLine = REG_VCOUNT;
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diffLine = newLine - lastLine;
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if (diffLine < 0) diffLine = 263 + diffLine;
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elapsedLines += diffLine;
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// does this correctly optimize?
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// elapsedTime = elapsedLines/16; // 16 lines = 1ms
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elapsedTime = elapsedLines >> 4; // 16 lines = 1ms
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lastLine = newLine;
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}
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}
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