本代码为编码开关代码，编码开关也就是数字音响中的

360度旋转的数字音量以及显示器上用的（单键飞梭开

关）等类似鼠标滚轮的手动计数输入设备。

我使用的编码开关为5个引脚的，其中2个引脚为按下

转轮开关（也就相当于鼠标中键）。另外3个引脚用来

检测旋转方向以及旋转步数的检测端。引脚分别为a,b,c

b接地a，c分别接到P2.0和P2.1口并分别接两个10K上拉

电阻，并且a，c需要分别对地接一个104的电容，否则

因为编码开关的触点抖动会引起轻微误动作。本程序不

使用定时器，不占用中断，不使用延时代码，并对每个

细分步数进行判断，避免一切误动作，性能超级稳定。

我使用的编码器是APLS的EC11B可以参照附件的时序图

编码器控制流水灯最能说明问题，下面是以一段流水

灯来演示。-Code for encoding the switch code, coding switch is in the digital audio

The number of 360-degree rotating display with the volume, as well as the (one-touch open Shuttle

Clearance) and similar to manually count the mouse wheel input device.

I use the code switch for the 5-pin, 2 pin for which the press

Rotary switch (it is equivalent to middle mouse button). In addition to 3-pin

Detection of rotation direction and rotation end detection step. Pin, respectively, for a, b, c

b grounding a, c, respectively, from P2.0 and P2.1, respectively, then the mouth and pull the two 10K

Resistance, and a, c, respectively, of the need to take a capacitance 104, or

Because the coding of the contact switch will cause a slight jitter malfunction. This procedure does not

The use of timers, interrupt off, do not use delay code, and each

Determine the number of sub-step, to avoid all the wrong moves, super stable performance.

I use the encoder is the APLS can refer to the annex EC11B