Error:Flash Download failed - Target DLL has been cancelled

当出现"Error: Flash Download failed - Target DLL has been cancelled"错误提示时，可能有几个原因导致。其中一种可能是由于SWD（Serial Wire Debug）引脚被占用或禁用而导致ST-LINK无法与目标板通信。可以尝试按住reset按钮，然后点击download按钮，并在松开reset按钮之前将新程序烧录进去，以便在SWD引脚被占用之前成功进行通信。另外，也可以检查是否正确安装了驱动程序，或者尝试交换时钟线和数据线的位置，以及重装驱动程序来解决问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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