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只显示I2C master，没显示TPA3251是因为权限没有开通，需要进行申请开通才能使用。
电压调到某个档，电流也要调到正确范围内。 user's guide中设置的是36V，电流是10A。
Set the power supply to 36 V (18-V to 38-V range) and current to 10 A (5-A to 14-A range).
