LCD驱动中参数的设置

最新推荐文章于 2023-07-28 01:34:31 发布

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最新推荐文章于 2023-07-28 01:34:31 发布

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	LCD时序图：


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	<span class="article-type type-1 float-left">原</span> <h1 class="title-article">LCD驱动中参数的设置</h1>
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	<span class="time">2011年11月04日 15:20:37</span>
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	<span class="read-count">阅读数：4637</span>

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	<p><span style="color:#0000f0;font-size:12px;">在LCD驱动程序中，需要我们根据LCD datasheet来设置相应的参数，这些参数包括：pixclock,left_margin,<span>right_margin,</span><span>upper_margin,</span><span>lower_margin,</span><span>hsync_len,</span><span>vsync_len,<span>VBP,</span><span>VFB,</span><span>VSPW,</span><span>HBP,</span><span>HFP,</span><span>HSPW。下图是典型的TFT
	LCD时序图：</span></span></span> </p>
	<p><span style="font-family:'宋体';"><a href="http://hi.baidu.com/sbuxmmm_2007/creat/blog/link.php?url=http://blog.chinaunix.net%2Fattachment%2F201101%2F20%2F20780196_1295498558gW2b.jpg" rel="nofollow"><span style="font-family:'隶书';color:#0000f0;font-size:12px;"></span></a><span style="font-family:'隶书';color:#0000f0;font-size:12px;">　<span style="font-family:'宋体';font-size:9pt;"> <img src="http://hi.youkuaiyun.com/attachment/201111/4/0_1320391325twnh.gif" alt="" /><span></span><br /></span></span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span style="font-family:'宋体';">　 </span><span>__u32 pixclock; /</span><span style="font-family:'宋体';">像素时钟</span><span>(</span><span style="font-family:'宋体';">皮秒</span></span><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>)/
	<br /></span><span style="font-family:'宋体';">　　</span><span>__u32 left_margin; /</span><span style="font-family:'宋体';">行切换，从同步到绘图之间的延迟</span></span><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>/
	<br /></span><span style="font-family:'宋体';">　　</span><span>__u32 right_margin; /</span><span style="font-family:'宋体';">行切换，从绘图到同步之间的延迟</span></span><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>/
	<br /></span><span style="font-family:'宋体';">　　</span><span>__u32 upper_margin; /</span><span style="font-family:'宋体';">帧切换，从同步到绘图之间的延迟</span></span><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>/
	<br /></span><span style="font-family:'宋体';">　　</span><span>__u32 lower_margin; /</span><span style="font-family:'宋体';">帧切换，从绘图到同步之间的延迟</span></span><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>/
	<br /></span><span style="font-family:'宋体';">　　</span><span>__u32 hsync_len; /</span><span style="font-family:'宋体';">水平同步的长度</span></span><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>/
	<br /></span><span style="font-family:'宋体';">　　</span><span>__u32 vsync_len; /</span><span style="font-family:'宋体';">垂直同步的长度</span><span>/</span><span></span></span></p>
	<p><span><span style="font-family:'隶书';color:#0000f0;font-size:12px;"> </span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span> VBP(vertical back porch)</span><span style="font-family:'宋体';">：表示在一帧图像开始时，垂直同步信号以后的无效的行数，对应驱动中的</span><span>upper_margin</span><span style="font-family:'宋体';">；</span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span style="font-family:'宋体';">　　</span><span>VFB(vertical front porch)</span><span style="font-family:'宋体';">：表示在一帧图像结束后，垂直同步信号以前的无效的行数，对应驱动中的</span><span>lower_margin</span><span style="font-family:'宋体';">；</span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span style="font-family:'宋体';">　　</span><span>VSPW(vertical sync pulse width)</span><span style="font-family:'宋体';">：表示垂直同步脉冲的宽度，用行数计算，对应驱动中的</span><span>vsync_len</span><span style="font-family:'宋体';">；</span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span style="font-family:'宋体';">　　</span><span>HBP(horizontal back porch)</span><span style="font-family:'宋体';">：表示从水平同步信号开始到一行的有效数据开始之间的</span><span>VCLK</span><span style="font-family:'宋体';">的个数，对应驱动中的</span><span>left_margin</span><span style="font-family:'宋体';">；</span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span style="font-family:'宋体';">　　</span><span>HFP(horizontal front porth)</span><span style="font-family:'宋体';">：表示一行的有效数据结束到下一个水平同步信号开始之间的</span><span>VCLK</span><span style="font-family:'宋体';">的个数，对应驱动中的</span><span>right_margin</span><span style="font-family:'宋体';">；</span><span></span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span><span> </span></span><span><span> </span>HSPW(horizontal sync pulse width)</span><span style="font-family:'宋体';">：表示水平同步信号的宽度，用</span><span>VCLK</span><span style="font-family:'宋体';">计算，对应驱动中的</span><span>hsync_len</span><span style="font-family:'宋体';">；</span></span></p>
	<p><span><span style="font-family:'隶书';color:#0000f0;font-size:12px;"> </span></span></p>
	<p></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>pixclock</span><span style="font-family:'宋体';">的计算：</span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>DOTCLK = f</span><span>frame </span><span>× (X + HBP + HFP+H<span>SPW</span>) × (Y + VBP + VFP+VSPW)
	<span> </span>(</span><span style="font-family:'宋体';">单位：</span><span>MHz)</span></span></p>
	<p><span style="font-family:'隶书';color:#0000f0;font-size:12px;"><span>pixclock = 1012/</span><span> DOTCLK=</span><span>1012/</span><span> （f</span><span>frame </span><span>× (X + HBP + HFP+H<span>SPW</span>) × (Y + VBP + VFP+VSPW)） (</span><span style="font-family:'宋体';">单位：皮秒</span><span>)</span></span></p>
	<p> <img src="http://hi.youkuaiyun.com/attachment/201111/4/0_132039133307ef.gif" alt="" /><span></span></p>
	<p><span>根据上图及上面的解说就容易看懂这值是如何设置的了：</span></p>
	<p><span></span> .left_margin = 68, //调整水平的位置，如果太小就会把图像左边的部分会显示在屏的右边<br />
	.right_margin = 39, //其他的如何设置请查看<br />
	.upper_margin = 16,<br />
	.lower_margin = 13,<br />
	.hsync_len = 31,<br />
	.vsync_len = 4,<br />
	上面的那个left_margin有时不太准确，在应用的过程中可以修正，下面的这几个修改好后就可以用。<br /></p>
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