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am335x 校准没有出现坐标光标



各位好,

    我们自己的板子,换了电容屏,移植驱动后,第一次进入校准,屏幕4个角落和中心处没有出现十字坐标光标,画面是一片黑,但是仍可以点击校准,坐标值也对,LCD显示也正常,进入系统后,关闭了matrix-gui,重新ts_calibrate也是一样的情况,请问要怎么做才能让它出现光标,不然不方便校准