当STM32无法下载代码后,错误一般是
JLink info:
DLL: V4.86b, compiled Jun 27 2014 20:11:00
Firmware: J-Link V9 compiled Dec 13 2019 11:14:50
Hardware: V9.40
S/N : 59406895
Feature(s) : RDI, GDB, FlashDL, FlashBP, JFlash
JLink Info: STM32Fxxxx: Cannot attach to CPU. Trying connect under reset.
Error: Flash Download failed - Target DLL has been cancelled
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