STM32 NUCLEO开发板通过Mini USB供电，需要用跳线帽短接JP1才能使用是为什么？

JP1 jumper can be set in case the board is powered by USB and maximum current consumption on U5V doesn’t exceed 100mA (including an eventual extension board or Arduino Shield).

STM32 NUCLEO开发板可以通过Mini USB(CN1)供电
但不能插上去就使用，需要用跳线帽短接JP1（红色方框位置）
资料原文：

JP1 jumper can be set in case the board is powered by USB and maximum current consumption on U5V doesn’t exceed 100mA (including an eventual extension board or Arduino Shield).

PS：没有跳线帽可以直接用杜邦线短接

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