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按照手册打开的时候输出如下，请问大家可能是什么原因，还有就是这个是用作SPI-TFT的背光用，不想每次开机后打开，想启动初始化pwm时候设置后占空比，怎么修改呢，要魔改驱动嘛 sh: write error: No such device 报错如下 设备树如下
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