问题：PPM的处理
刚刚接触四轴，潜水了几天阅读大虾们的成果，产生了一些疑问。1. 网站上流行的PPM处理方式是通过一个单片机将接收机的8通道串行组成为一个通道，再输出给FC。我的问题是，为什么不直接通过I2C的方式？省得FC还得再次检测PPM。
2. 今天上MikroKopter网站看了一些资料，德国人的四轴好像没有“PPM板”。是不是德国人直接从接收机上取得的串行控制信号，无需并转串？ 终于了解了，看来德国人的是直接将串行的PPM信号从接收机上引出的，摘自德国人的网站（http://www.mikrokopter.com/ucwiki/en/FlightCtrlManual?highlight=%28KategorieEnglish%29#PPM_input）：
PPM input
Here we connect the receiver. Two wires for the supply voltage and one for the receiver’s R/C sum signal. Compared to a normal servo PPM signal the sum signal contains all the channels sent by the R/C transmitter before they are decoded by the receiver. This signal is available in every receiver but there are only a few where this signal is directly accessible from outside (e.g. the RX3 Multi by ACT). ( --> RC receiver ) mark,关注PPM方面的资料,能请教一下吗?我的QQ:53827302.
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