用28035做CPU,H桥驱动电路,做了一块步进电机驱动的板子,不连接电机空载时波形正常,但是连接步进电机测试的时候,板子只要连接上步进电机DSP输出波形就被拉下来了输出就不正常了,请问这是我硬件的问题还是我软件设置的问题
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