< ：TI_MSP430_内容页_SA7 -->
原来是电压供不上，文档中说：
NOTE: When the LM3S9B96 Development Board is used in USB Host mode, the host connector
is capable of supplying power to the connected USB device. The available supply current
is limited to ~200 mA unless the development board is powered from an external 5 V
supply with a =600mA rating.
换成外接的5v就ok了。
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NOTE: When the LM3S9B96 Development Board is used in USB Host mode, the host connector
is capable of supplying power to the connected USB device. The available supply current
is limited to ~200 mA unless the development board is powered from an external 5 V
supply with a =600mA rating.
换成外接的5v就ok了。
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