基于MSP430F5529的电机测速程序。基本原理是通过光电门测量平均时间内结果光电门的轮轴数，从而计算得到电机速度，并通过串口助手在电脑上显示。(Motor speed based on MSP430F5529 program. Basic principle is through the photoelectric measurement result photoelectric shaft of the door number, the average time to calculate the motor speed, and through a serial port assistants displayed on the computer.)