修复滤波设置问题，根据标志帧和扩展帧判别所需位移，根据滤波模式判别CAN_FxR2[3:0]设置。
修复滤波设置问题，根据标志帧和扩展帧判别所需位移，根据滤波模式判别CAN_FxR2[3:0]设置。

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