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DS90UB27与DS90UB926之间透传显示器亮度控制信号问题

TI大神你们好!

主机端通过927的GPIO8透传显示器亮度控制信号到显示器端926的GPIO8,有时候会出现透传失败的问题,即主机端927的GPIO8电平已经由PWM信号变为低电平,但显示器端926的GPIO8会一直保持为高电平。出现这个问题后通过重新给显示器端926上电可以恢复。

        请帮忙看看产生这个问题的原因可性能。