Flash Download failed - Target DLL has been cancelled报错

当出现"Flash Download failed - Target DLL has been cancelled"错误时，可能是由于SWD引脚被占用或禁用导致ST-LINK无法与板子进行通信。一种解决方法是打开Options for Target，选择debug，然后选择相应的下载器名称，再选择Settings。如果在Settings中找不到SWDIO的名称，则说明没有成功。可以在Flash Download界面勾选上Reset and run选项，这样在下载程序时不需要反复按复位键。然后返回，选择Utilities界面，有两种选择：第一种是勾选Use Debug Driver，第二种是选择Settings，选择相应的下载器名称。最后进行下载，应该能够成功。如果仍然不行，可以尝试在最后一步的两种情况中多次尝试。有时还需要按住boot0键然后点击下载，再放开boot0键，才能下载成功。另外，还有一些其他方法可以尝试解决该问题，如将BOOT0的跳线帽拔开，连接3.3V，下载程序成功后再将跳线帽连接回去。这是一种可行的方法。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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