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TMS320F28335 怎样解码CW/CCW型式的脉冲

Other Parts Discussed in Thread: TMS320F28335

   大家好,TMS320F28335只有2个eQEP外设,其中一个需要解码AB正交的编码器信号,另外一路需要接入脉冲给定。脉冲给定有3种型式,AB正交、方向+脉冲、CW/CCW(波形如图所示),但eQEP只支持AB正交和方向脉冲信号,解码这种信号通常需要2个计数器配合使用,而28335又没有其他计数器可用,请问如何解码这种信号?