The breathing light&USBCDC test program has been burned in the factory The jumper cap does not need to be installed and can be used directly. BOOT0 internal 10K resistor pull-down Flash pads have been reserved, USBDisk&&FATFFS routines are provided 25MHZ high-speed crystal & 32.768Khz 6PF low-speed crystal If the jumper cap cannot be installed, please adjust the direction of the jumper cap. Because the jumper cap is wide on one side and narrow on the other
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