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矩阵键盘波形

Other Parts Discussed in Thread: AM3505

我用的是AM3505,内核是2.6.37,在矩阵键盘测试时,按键按下弹起,用示波器量相应的列(输出端)量出来的波形是个斜波,有1毫秒的下降时间,请问正常情况是不是方波,没有下降时间的