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配置描述符中,bmAttributes是指什么?
d12中说是:D7:总线供电
D6:自供电 D5:远程唤醒 D4..0:保留(复位为零) 请问我只是自供电,我该设为多少呢?60H还是04H? |
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沙发#
发布于:2003-11-29 21:15
你如果启用的远程唤醒功能,应该是0xe0(注意,D7应该总是为1的)如下:
Configuration characteristics D7: Reserved (set to one) D6: Self-powered D5: Remote Wakeup D4...0: Reserved (reset to zero) D7 is reserved and must be set to one for historical reasons. 如果你没有用远程唤醒,那就是0xC0。 |
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