2812片上qep使用例程，使用的是qep1、qep2来完成正交编码检测的。运行后查看speed即为电机转动1s产生的脉冲数。脉冲信号需要接到qep1、qep2引脚。-2812 on qep use routines, using qep1, qep2 to complete the orthogonal encoding detection. After viewing the motor running speed is the number of pulses generated by r