说明：  《角度测量器》 用光电编码器测量角度，每个脉冲为 0.72 度。 测量范围：0.0～360.0 度 为保证不错过脉冲，用 timer1计数，在电平跳变中断里判断转动方向，尽量加快处理过程。 数据换算和数码管扫描显示在主循环中实现。
(" Angle measuring device" with the optical encoder measuring the angle of each pulse is 0.72 degrees. Measuring range: 0.0 to 360.0 degrees off in order to ensure a good pulse, with timer1 count, the level of disruption in the transition to determine the direction of rotation, as far as possible to speed up the process. Conversion and digital scan data displayed in the main loop implementation.)