合体的那个板子，编译后上传marlin固件，进度条走到最后就出现timeout提示，绿色的灯一个一直在闪烁。求解。。。第一步就卡住了，固件上传不了
Sketch uses 128,562 bytes (49%) of program storage space. Maximum is 258,048 bytes.
Global variables use 4,588 bytes (56%) of dynamic memory, leaving 3,604 bytes for local variables. Maximum is 8,192 bytes.
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
USB無法識別
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