本帖最后由 lawme 于 2013-3-6 06:37 编辑
lawme 发表于 2013-3-6 04:47 
祝贺你的成果。
能具体说说你用的连接线吗？比如生产厂家、品牌、价格、可以在哪买到等等。
HDMI->VGA Cables HDMI to VGA cables do not work! They rely on logic incorporated in a video card that isn't available in a PI.Somehow such a video card outputs analog signal on the otherwise purely digital HDMI connector, that seems to be the only way for it to work.But normally HDMI cables never carry analog signals and the PI surely doesn't output analog signals either, almost no HDMI output device does, as its completely against HDMI specifications.
HDMI->VGA converter boxes HDMI to VGA converters do work, they convert the digital serial data streams from HDMI and using complex logic, and digital to analog converters they convert the HDMI signal to the analog signals needed for VGA, and sometimes also convert HDMI audio to an analog stereo signal. But note that if they feed off the PI it can cause a problem, as the PI only is designed to provide about 50mA to the (HDMI or DVI-D) monitor, and these adapters use >200mA, while the absolute maximum the PI can let through is 200mA.These adapters also thus use about half the energy that the PI (without USB devices) uses.Therefore its much better to use an adapter that has an external power input. Alternatively there are HDMI dongles (male to female HDMI adapters) that have a barrel input connector to feed the adapter with.
上面说的意思，hdmi-vga简单的连接线（cable），肯定不能使用；能用的是有电路板的适配器（adaptor），在这里称作“HDMI->VGA converter box”。
这种适配器，性价比太低，还不如直接买个有hdmi口的显示器。那种“一线屏”，才二、三百元。
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发表于 2013-3-3 17:43:15
楼主